Gear-change selector module for a gearshift

Abstract

A gear-change selector module for a gearshift of a motor vehicle has a movable element and a shift fork having a carrier arm which engages in a recess of the movable element. The recess has two actuating faces which cooperate with carrier faces of the carrier arm. Viewed in a section running through the centre axis of the movable element and the centre axis of the recess, the actuating faces are each convex in a first portion extending from the centre axis in the direction of the outside of the movable element. Furthermore, viewed in a section running through the centre axis of the movable element and the centre axis of the recess, the carrier faces each extend in a first portion from radially outside the movable element up to the centre axis of the movable element, and in a second portion from the centre axis in the direction of the free end of the carrier arm. The carrier faces are convex in the second portion.

Claims

1. A gear-change selector module for a gearshift of a motor vehicle, comprising: a housing, a movable element movable in an axial direction, and a shift fork having a carrier arm which engages in a recess of the movable element, wherein the recess extends from an outside of the movable element into the movable element, beyond a center axis of the movable element in a direction perpendicular to the center axis, wherein the recess has two actuating faces which lie opposite one another in the axial direction and cooperate with carrier faces arranged on sides of the carrier arm facing away from one another, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces are each convex in a first portion extending from the center axis in the direction of the outside of the movable element, and wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the carrier faces each extend in a first portion from radially outside the movable element up to the center axis of the movable element, and in a second portion beyond the center axis of the movable element, with the carrier faces being convex only in the second portion.

2. The gear-change selector module according to claim 1, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the first portions of the actuating faces each have a first radius of less than 50 mm.

3. The gear-change selector module according to claim 2, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the second portions of the carrier faces each have a second radius of less than 200 mm.

4. The gear-change selector module according to claim 2, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces are each flat in a second portion extending from the center axis away from the first portion of the actuating faces, in particular perpendicular to the center axis of the movable element.

5. The gear-change selector module according to claim 2, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the center axis of the movable element intersects the carrier faces such that the radial extent of the first portion of the carrier face amounts to maximum 500% of the radial extent of the second portion of the corresponding carrier face.

6. The gear-change selector module according to claim 2, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces each have a second portion, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the center axis of the movable element intersects the actuating faces such that the radial extent of the first portion of the actuating face in each case amounts to maximum 300% of the radial extent of the second portion of the corresponding actuating face.

7. The gear-change selector module according to claim 2, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces each have a second portion, wherein each first portion of the actuating faces and of the carrier faces respectively transforms into the second portion of the corresponding actuating face of and the second portion of the corresponding carrier face without an edge or step.

8. The gear-change selector module according to claim 2, wherein the first radius is between 10 mm and 34 mm, in particular between 20 mm and 24 mm.

9. The gear-change selector module according to claim 8, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the first portions of the carrier faces are each concave and have a radius which is at least as great as the first radius.

10. The gear-change selector module according to claim 8, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the second portions of the carrier faces each have a second radius of less than 200 mm.

11. The gear-change selector module according to claim 8, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces are each flat in a second portion extending from the center axis away from the first portion of the actuating faces, in particular perpendicular to the center axis of the movable element.

12. The gear-change selector module according to claim 8, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the center axis of the movable element intersects the carrier faces such that the radial extent of the first portion of the carrier face amounts to maximum 500% of the radial extent of the second portion of the corresponding carrier face.

13. The gear-change selector module according to claim 8, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces each have a second portion, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the center axis of the movable element intersects the actuating faces such that the radial extent of the first portion of the actuating face in each case amounts to maximum 300% of the radial extent of the second portion of the corresponding actuating face.

14. The gear-change selector module according to claim 2, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the first portions of the carrier faces are each concave and have a radius which is at least as great as the first radius.

15. The gear-change selector module according to claim 1, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the second portions of the carrier faces each have a second radius of less than 200 mm.

16. The gear-change selector module according to claim 15, wherein the second radius is between 50 mm and 140 mm, in particular between 90 mm and 100 mm.

17. The gear-change selector module according to claim 1, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces are each flat in a second portion extending from the center axis away from the first portion of the actuating faces, in particular perpendicular to the center axis of the movable element.

18. The gear-change selector module according to claim 1, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the center axis of the movable element intersects the carrier faces such that the radial extent of the first portion of the carrier face amounts to maximum 500% of the radial extent of the second portion of the corresponding carrier face.

19. The gear-change selector module according to claim 1, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces each have a second portion, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the center axis of the movable element intersects the actuating faces such that the radial extent of the first portion of the actuating face in each case amounts to maximum 300% of the radial extent of the second portion of the corresponding actuating face.

20. The gear-change selector module according to claim 1, wherein when viewed in a section running through the center axis of the movable element and the center axis of the recess, the actuating faces each have a second portion, wherein each first portion of the actuating faces and of the carrier faces respectively transforms into the second portion of the corresponding actuating face and the second portion of the corresponding carrier face without an edge or step.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) Further advantages and features will become apparent from the following description and from the appended drawings, in which:

(2) FIG. 1 shows a perspective illustration of a gear-change selector module according to the invention with several movable elements and shift forks,

(3) FIG. 2 shows a section through a movable element and a shift fork coupled to the movable element of the gear-change selector module from FIG. 1, and

(4) FIG. 3 shows, in a detail view of FIG. 2, a carrier arm of the shift fork which engages in a recess of the movable element.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 shows a gear-change selector module 10 for a gearshift of a motor vehicle, which has a housing 12 with actuators 14 and several shift forks 16 which can be moved by means of the actuators 14 in the axial direction A on a shaft 18 of the gear-change selector module 10.

(6) The actuators 14 each have a receiver 20 (see FIG. 2) and a movable element 22 which is mounted in the receiver 20 so as to be movable both in and against the axial direction A.

(7) The actuators 14 are here each coupled to one of the shift forks 16 via a carrier arm 24 of the shift fork 16, which engages radially in a recess 26 in the movable element 22.

(8) In the present embodiment, the actuators 14 are hydraulic cylinders, the movable elements 22 are accordingly actuator pistons, and the receivers 20 are piston receivers.

(9) In an alternative embodiment, the actuators may be electro-mechanically operated. In this case, the movable elements 22 are e.g. actuating elements, and the receivers 20 are guides in which the actuating elements are guided accordingly.

(10) With reference to FIGS. 2 and 3, which each show a section through the centre axis K of the movable element 22 and the centre axis M of the recess 26, it is explained below how the coupling is configured using the example of an actuator-shift fork pair 14, 16.

(11) The recess 26 extends from an outside 28 of the movable element 22 facing the shift fork 16 radially into the movable element 22, and beyond the centre axis K of the movable element 22.

(12) The recess 26 here has two actuating faces 30, 31 which lie opposite one another in the axial direction A and each extend in a first portion 32 from the outside 28 up to the centre axis K, and in a second portion 34 from the centre axis K up to an end 36 of the recess 26.

(13) In the present exemplary embodiment, the end 36 is formed by a base of the recess 26. In an alternative embodiment, the end 36 may be designed arbitrarily, for example as an opening on the outside 38 of the movable element 22 facing away from the shift fork 16.

(14) The first portion 32 here transforms constantly into the second portion 34, i.e. without a jump or step and without forming an edge.

(15) Furthermore, the first portion 32 of the actuating faces 30, 31 is formed convex and in each case extends with a radius R1 of 22 mm from the outside 28 up to the centre axis K.

(16) In an alternative embodiment, only a part of the first portion 32 of the actuating faces 30, 31 may be formed convex, for example if a chamfer is provided at the transition to the outside 28.

(17) In all embodiments, the actuating faces 30, 31 are however formed convex in the first portion 32, i.e. at least in a portion of the first portion 32.

(18) Furthermore, in a further embodiment, the radius R1 may be of any size. Preferably however, the radius R1 is less than 50 mm or between 10 mm and 34 mm, in particular between 20 mm and 24 mm.

(19) In the present exemplary embodiment, the second portion 34 of the actuating faces 30, 31 is flat and extends perpendicularly to the centre axis K, from the centre axis K up to the end 36 of the recess 26.

(20) In an alternative embodiment, only a part of the second portion 34 of the actuating faces 30, 31 may be formed flat.

(21) In principle, the actuating faces 30, 31 may be configured differently from one another. For example, in one embodiment, the radius R1 of the actuating face 30 may differ from the radius R1 of the actuating face 31.

(22) The edges which form the transition between the actuating faces 30, 31 and the end 36 of the recess 26 here have a rounding, but this is not significant for the coupling function.

(23) The carrier arm 24 has two carrier faces 40, 41, which are arranged opposite one another in the axial direction A and each lie opposite one of the actuating faces 30, 31 in the recess 26 and cooperate therewith when the movable element 22 is moved in or against the axial direction A, in order to actuate the shift fork 16 and move this accordingly on the shaft 18.

(24) The carrier faces 40, 41 here extend in the first portion 42 from a base body 44 of the shift fork 16 arranged outside the movable element 22, radially up to the centre axis K of the movable element 22, and in a second portion 46 from the centre axis K up to a free end 48 of the carrier arm 24.

(25) The first portion 42 here transforms constantly into the second portion 46, i.e. without a jump or step and without forming an edge.

(26) Furthermore, here the first portion 42 of the carrier face 40 is concave and extends with a radius R2 of 24 mm from the base body 44 to the centre axis K, while the first portion 42 of the carrier face 41 is concave and extends with a radius R3 of 200 mm from the base body 44 to the centre axis K.

(27) In an alternative embodiment, only a part of the first portion 42 of the carrier faces 40, 41 may be formed concave.

(28) In principle, the carrier faces 40, 41 may each be shaped arbitrarily in the first portion 42.

(29) Preferably however, at least the carrier face 40 is formed concave in the first portion 42, i.e. at least in a portion of the first portion 42.

(30) Furthermore, in a further embodiment, the radii R2, R3 may be of arbitrary size, in particular at least as great as the radius R1 of the correspondingly opposite actuating face 30, 31.

(31) The second portion 46 of each carrier face 40, 41 is convex and extends with a radius R4 of 95 mm from the centre axis K up to the free end 48 of the carrier arm 24.

(32) In an alternative embodiment, only a part of the second portion 46 of the carrier faces 40, 41 may be formed convex.

(33) In all embodiments, the carrier faces 40, 41 are however formed convex in the second portion 46, i.e. at least in a portion of the second portion 46.

(34) Furthermore, in a further embodiment, the radius R4 may be of any size. Preferably however, the radius R4 is less than 200 mm or between 50 mm and 140 mm, in particular between 90 mm and 100 mm.

(35) In principle, the carrier faces 40, 41 may be configured differently from one another. For example, in one embodiment, the radius R4 of the carrier face 40 may differ from the radius R4 of the carrier face 41.

(36) The edges which form the transition between the carrier faces 40, 41 and the free end 48 of the carrier arm 24 here have a rounding, which is provided however in addition to the convex portion of the second portion 46 and is of no further significance in particular for the coupling of the movable element 22 and the shift fork 16.

(37) The ratio of the radial extent C of the first portion 42 to the radial extent D of the second portion 46, in the carrier faces 40, 41 of the present exemplary embodiment, is approximately 3:1, i.e. the first portion 42 is around three times as long as the second portion 46 in the radial direction.

(38) In principle, the ratio of the radial extent C of the first portion 42 to the radial extent D of the second portion 46 may be of arbitrary amount.

(39) In one embodiment, the radial extent C of the first portion 42 is maximum five times as great as the radial extent D of the second portion 46.

(40) The ratio of the radial extent E of the first portion 32 to the radial extent F of the second portion 34, in the actuating faces 30, 31 of the present exemplary embodiment, is approximately 2:1, i.e. the first portion 32 is around twice as long as the second portion 34 in the radial direction.

(41) In principle, the ratio of the radial extent E of the first portion 32 to the radial extent F of the second portion 34 may of arbitrary amount.

(42) In one embodiment, the radial extent E of the first portion 32 is maximum three times as great as the radial extent F of the second portion 34.

(43) On operation of the shift fork 16 in the axial direction A, the shift fork 16 lies with the carrier face 40 on the actuating face 30 of the movable element 22. Here, the force is transmitted from the movable element 22 to the shift fork 16 in the region of the centre axis K of the movable element 22 and in the direction of the centre axis K.

(44) The same applies on operation of the shift fork against the axial direction A, in which the shift fork 16 lies with the carrier face 41 against the actuating face 31 of the movable element 22.

(45) Even under high loads in which the carrier arm of the shift fork 16 deforms because of the unavoidable material elasticity, the curved actuating faces 30, 31 in connection with curved carrier faces 40, 41 guarantee that the carrier faces 40, 41 can roll on the actuating faces 30, 31 and hence the force is transmitted from the movable element 22 to the shift fork 16 in the region of the centre axis K.

(46) In this way, tilt moments on the movable element 22 are reduced or avoided.

(47) This provides a gear-change selector module 10 which ensures a defined coupling of the shift forks 16 to the movable elements 22 even under high load.