Hand brake limiting device

Abstract

Provided is a hand brake limiting device, comprising a bearing I (10), a spring, a spring holder (12), a guide plate (9), and a guide plate holder (23); the bearing I (10) is disposed on the spring holder (12); the spring is sleeved on the outside of the bearing I (10); the guide plate (9) and the guide plate holder (23) are sequentially disposed at one side of the spring away from the spring holder (12); a stopper post III (7) is secured to one side of the spring holder (12) facing the spring; a stopper post In (8) is secured to one side of the guide plate (9) facing the spring; a stopper post II (26) is secured to one side of the guide plate holder (23) facing the guide plate (9).

Claims

1. A hand brake limiting device, comprising a bearing I (10), a spring (11), a spring holder (12), one or more guide plate (9) and a guide plate holder (23), wherein the bearing I (10) is disposed on the spring holder (12) and the spring is sleeved on the outside of the bearing I (10), the one or more guide plate (9) and the guide plate holder (23) are disposed successively at one side of the spring away from the spring holder (12); a stopper post III (7) is secured to one side of the spring holder (12) facing the spring, a stopper post I (8) is respectively secured to one side of each of the one or more guide plate (9) facing the spring (11), a stopper post II (26) is secured to one side of the guide plate holder (23) facing the one or more guide plate (9); two ends of the spring are in curved shape, each of the one or more guide plate (9) is respectively provided with an arcuate groove that penetrates each of the one or more guide plate (9); the number of guide plates (9) is n, 1n10; when n2, the stopper post I on the n.sup.th guide plate (9) rotates in the arcuate groove of the n1.sup.th guide plate with the n1.sup.th guide plate being adjacent to the n.sup.th guide plate (9) and closer to the spring; and the stopper post II (26) rotates in the arcuate groove of the n.sup.th guide plate.

2. The hand brake limiting device according to claim 1, wherein the spring is a torsion spring or a leaf spring; the two ends of the spring are of an arc shape, sharp corner shape or I shape.

3. The hand brake limiting device according to claim 1, wherein the arcuate groove on each of the one or more guide plate (9) is composed of an inner circumference and two curved ends.

4. The hand brake limiting device according to claim 3, wherein the number of turns of the spring is N, 3N6; a wire diameter of the spring is r, 4 mmr6 mm.

5. The hand brake limiting device according to claim 3, wherein one end of the spring close to the spring holder (12) is clamped with the stopper post III (7), and another end of the spring close to the one or more guide plate (9) is clamped with the stopper post I (8).

6. The hand brake limiting device according to claim 3, wherein a height of the stopper post III (7) is H.sub.3, a height of the stopper post II (26) is H.sub.2, and a height of the stopper post I (8) is H.sub.1; rH.sub.3(N1) *r, rH.sub.1(N1)*r, the H.sub.2 is greater than a thickness of the guide plate holder (23), no greater than the sum of a thickness of the one or more guide plate (9) and a thickness of the guide plate holder (23).

7. The hand brake limiting device according to claim 2, wherein the arcuate groove on each of the one or more guide plate (9) is composed of an inner circumference and two curved ends.

8. The hand brake limiting device according to claim 7, wherein the number of turns of the spring is N, 3N6; a wire diameter of the spring is r, 4 mmr6 mm.

9. The hand brake limiting device according to claim 7, wherein one end of the spring close to the spring holder (12) is clamped with the stopper post III (7), and another end of the spring close to the one or more guide plate (9) is clamped with the stopper post I (8).

10. The hand brake limiting device according to claim 7, wherein a height of the stopper post III (7) is H.sub.3, a height of the stopper post II (26) is H.sub.2, and a height of the stopper post I (8) is H.sub.1; rH.sub.3(N1)*r, rH.sub.1(N1)*r, the H.sub.2 is greater than a thickness of the guide plate holder (23), no greater than the sum of a thickness of the one or more guide plate (9) and a thickness of the guide plate holder (23).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic diagram I of a hand brake in embodiment 1 of the present application;

(2) FIG. 2 is a schematic diagram II of a hand brake in embodiment 1 of the present application;

(3) FIG. 3 is a schematic diagram I of a hand brake limiting device in embodiment 1 of the present application;

(4) FIG. 4 is the A-A sectional view of FIG. 3;

(5) FIG. 5 is a schematic diagram I of base assembly of a hand brake in the present application;

(6) FIG. 6 is the A-A sectional view of FIG. 5;

(7) FIG. 7 is a schematic diagram II of base assembly of a hand brake in the present application;

(8) FIG. 8 is a schematic diagram I of drive shaft assembly of a hand brake in the present application;

(9) FIG. 9 is a schematic diagram II of drive shaft assembly of a hand brake in the present application;

(10) FIG. 10 is a schematic diagram of chain state of the prior hand brake under the relief state;

(11) FIG. 11 is a schematic diagram of chain state of a hand brake under the relief state in embodiment 1 in the present application;

(12) FIG. 12 is an exploded view of the handle of hand brake in the present application;

(13) FIG. 13 is a schematic diagram of the guide plate structure in embodiment 4 in the present application.

(14) Of which, 1enclosure, 2 chain winding shaft, 3 drive shaft assembly, 4 hand wheel, 5 chain, 6 base assembly, 7 stopper post III, 8 stopper post I.sub.n, 9 guide plate, 10 bearing I, 11 torsion spring, 12 spring holder, 13 bull gear, 14 handle, 15 rivet, 16 drive shaft, 17 pin wheel, 18 clutch, 19 ratchet, 20 pinion, 21 end part, 22 base, 23 guide plate holder, 24 bearing block, 25 bearing II, 26 stopper post II, 27 pawl, 28 pawl pin, 29 pawl holder, 30 counterweight, 31 inner circumference of the arcuate groove, 32 curved end of the arcuate groove.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(15) The present application is further described in combination with drawings and examples.

EXAMPLE 1

(16) A hand brake, comprising a hand wheel 4, a chain 5, an enclosure 1, a drive shaft assembly 3 which is disposed in the enclosure 1, a bull gear 13, and a base assembly 6; the hand wheel 4 is connected to the drive shaft assembly 3, one end of the chain 5 is fixed to the bull gear 13 by means of rivets, and the main shaft of the bull gear 13 is a chain winding shaft 2. The drive shaft assembly 3 comprises a drive shaft 16, a pin wheel 17, a clutch 18, a ratchet 19, a pinion 20 and an end part 21 arranged successively; the hand wheel 4 is disposed at the end close to the drive shaft 16 and secured to the drive shaft 16, and the bull gear 13 is located at the end close to the pinion 20 and engaged with the pinion 20. The end part 21 of the hand brake is connected with the drive shaft 16 by elastic cylindrical pins, which can facilitate the overhaul of the drive shaft assembly.

(17) The enclosure 1 is provided with a function handle 14, a pawl 27, a pawl pin 28 and a pawl holder 29, the function handle 14 is fixedly connected with the pawl pin 28, and the pawl 27 is restricted on the pawl pin 28 rotatably through a pawl holder 29. A counterweight 30 is disposed on the side of pawl pin 28 away from the pawl holder 29. The pawl 27 is clamped between adjacent gears of ratchet 19, so that the ratchet 19 can rotate clockwise driven by the drive shaft 16, preventing the counterclockwise rotation of the ratchet 19.

(18) The hand brake further comprises a limiting device which is disposed on the chain winding shaft 2 and which is between the bull gear 13 and the base 22. The limiting device comprises a bearing I 10, a torsion spring 11, a guide plate 9 and a guide plate holder 23. The torsion spring 11 is sleeved on the outside of the bearing I 10, the spring holder 12 is disposed at one side of the torsion spring 11 close to the bull gear 13, and the guide plate 9 and the guide plate holder 23 are successively disposed on one side of the torsion spring 11 close to the base 22. A stopper post III 7 is secured to one side of the spring holder 12 facing the torsion spring 11, a stopper post I 8 is secured to one side of the guide plate 9 facing the torsion spring 11, and a stopper post II 26 is secured to the base 22 facing the guide plate holder 23. Curved hooks are provided at both ends of the torsion spring 11, and the guide plate 9 and the guide plate holder 23 are annular structures. The guide plate 9 is provided with an arcuate groove that penetrates the guide plate 9, and the width of the groove is not less than the diameter of the stopper post II 26, and the arc length of the groove is not more than three-quarters of the circumference. Holes matching with the stopper post II 26 are arranged on the guide plate holder 23, and the stopper post II 26 passes, by means of a hole, through the guide plate holder 23 and rotates in the arcuate groove. The base 22 is further provided with bearing II 25, which is disposed on the base 22 through the bearing block 24. Outside of the bearing block 24 is the guide plate holder 23. The guide plate holder is 4 mm in thickness and the guide plate is 6 mm in thickness.

(19) The torsion spring 11 is made of 65 Mn; the number of turns of the torsion spring 11 is 4; the wire diameter of the torsion spring 11 is 5 mm. The end 11a of the torsion spring 11 close to the spring holder 12 is clamped with the stopper post III 7, and the end 11b of the torsion spring 11 close to the guide plate 9 is clamped with the stopper post I 8. The height H.sub.3 of the stopper post 1117 is 5 mm, the height H.sub.2 of the stopper post II 26 is 9 mm and height H.sub.1 of the stopper post I 8 is 5 mm.

(20) Since the bull gear of the hand brake after improvement adopts a limiting structure, under the natural state, there is a lateral distance of 47 mm between the center of chain and the center of chain winding shaft. The prior hand brake lacks of the limiting device, and the chain naturally drops under the action of gravity, thus there is no lateral offset between the chain center and the center of the chain winding shaft.

(21) The improved hand brake can guarantee the performance of the hand braking system of the truck after adjusting the position of the mounting location (to avoid interference with the windshield), and the multiplying power of the improved hand brake is consistent with that before improvement. The distance between the drive shaft of the hand brake and the central line of the chain at the end of chain winding shaft is 40 mm greater than that before improvement.

(22) TABLE-US-00001 TABLE 1 Comparison of technical parameters between the present application and prior hand brake The present Prior hand No. Technical Parameters application brake 1 Diameter of hand wheel D/mm 400 400 2 Braking ratio 27 27 3 Involvement amount of chain L/mm 458 458 4 Input torque/N .Math. m 156 156 5 Minimum output chain tension/kN 10 10 6 Machine maximum width/mm 524 524 7 Machine maximum height/mm 400 400 8 Machine maximum thickness/mm 270 236 9 Shape and size of mounting hole/mm Lateral 286, Lateral 286, vertical 305 vertical 305 10 Weight/kg 37 34

EXAMPLE 2

(23) The difference from Example 1 is as follows: The number of turns of the torsion spring 11 is 5; the wire diameter of the torsion spring 11 is 4 mm. The height H.sub.3 of the stopper post III7 is 6 mm, the height H.sub.2 of the stopper post II 26 is 10 mm and the height H.sub.1 of the stopper post I 8 is 14 mm.

EXAMPLE 3

(24) The difference from Example 1 is as follows: The number of turns of the torsion spring 11 is 6; the wire diameter of the torsion spring 11 is 4 mm. The height H.sub.3 of the stopper post III7 is 8 mm, the height H.sub.2 of the stopper post II 26 is 8 mm and the height H.sub.1 of the stopper post I 8 is 8 mm.

EXAMPLE 4

(25) The difference from Example 1 is as follows: The limiting device comprises a bearing I 10, a leaf spring, a spring holder 12, a guide plate 9 and a guide plate holder 23, and the bearing I 10 is disposed on the spring holder 12. The leaf spring is sleeved on the outside of the bearing I 10, the guide plate 9 and the guide plate holder 23 are successively disposed on one side of the leaf spring where away from the spring holder 12. A stopper post III 7 is secured to one side of the spring holder 12 facing the leaf spring, a stopper post I.sub.n 8 is secured to one side of the guide plate 9 facing the leaf spring, and a stopper post II 26 is secured to one side of the guide plate holder 23 facing the guide plate 9; the guide plate holder is connected with the base fixedly. The two ends of the leaf spring are in shape, and the guide plate 9 is provided with an arcuate groove that penetrates the guide plate 9; the arcuate groove comprises an inner circumference and two curved ends. The corresponding central angle of the arcuate groove is 15. The number of guide plates 9 is 10, the stopper post I.sub.n on the n.sup.th guide plate 9 rotates in the arcuate groove of the n1.sup.th guide plate; and the stopper post II 26 rotates in the arcuate groove of the 10.sup.th guide plate.

(26) The number of turns of the leaf spring 11 is 3; the wire diameter of the leaf spring 11 is 6 mm. The height H.sub.3 of the stopper post III7 is 10 mm, the height H.sub.2 of the stopper post II 26 is 7 mm and height H.sub.1 of the stopper post I.sub.n 8 is 6 mm.

EXAMPLE 5

(27) The difference from Example 4 is as follows: the spring is a torsion spring, and the two ends of the spring are in sharp corner shape. The central angle corresponding to the arcuate groove is 350, and the number of guide plate 9 is 5. The number of turns of the torsion spring 11 is 5; and the wire diameter of the torsion spring 11 is 4 mm.

EXAMPLE 6

(28) The difference from Example 4 is as follows: the spring is a torsion spring, and the two ends of the spring are in arc shape. The central angle corresponding to the arcuate groove is 180, and the number of guide plate 9 is 3. The number of turns of the torsion spring 11 is 5; and the wire diameter of the torsion spring 11 is 4 mm.