Synchronizer ring

Abstract

A synchronizer ring is made of steel and has a main body with a conical friction surface. A toothing and at least one blocking body project radially outward from the main body. The blocking body has an engagement section extending in the axial direction. The engagement section has a first edge, which runs approximately parallel to a first end face of the main body and has a first width extending in the circumferential direction, and two mutually opposite second edges extending from the first edge. To improve the durability of the synchronizer ring, the second edges have a convex curvature in a plan view of the engagement section. A second width extending in the circumferential direction between the second edges is greater than the first width at a depth spaced apart from the first edge.

Claims

1. A synchronizer ring formed from steel, comprising: a main body having a conical friction surface, a first end face and a second end face; toothing sections projecting radially outward from said main body; and at least one blocking body projecting radially outward from said main body, said blocking body having an engagement section extending in an axial direction, said engagement section having a first edge running equidistant to said first end face of said main body and having a first width extending in a circumferential direction, and two mutually opposite second edges extending from said first edge, said two mutually opposite second edges having a convex curvature in a radial plan view of said engagement section, wherein said engagement section having a second width extending in the circumferential direction between said two mutually opposite second edges and being greater than the first width at a depth spaced apart from said first edge.

2. The synchronizer ring according to claim 1, wherein a ratio of the first width to the second width is:
B2=B1*K, wherein: K is a factor in a range of 1.005 to 1.09; B1 is the first width; and B2 is the second width.

3. The synchronizer ring according to claim 1, wherein said main body has a circumferential section adjoining said first end face of said main body and said toothing sections extend from said circumferential section.

4. The synchronizer ring according to claim 3, wherein said blocking body is formed by a tab extending from said circumferential section, wherein said tab has a bent over section and said engagement section, said engagement section extends from said bent over section in the axial direction to said second end face situated opposite said first end face of said main body.

5. The synchronizer ring according to claim 1, wherein said toothing sections are formed in sections in the circumferential direction.

6. The synchronizer ring according to claim 1, wherein said blocking body or a centering tab extends in each gap formed between two adjacent ones of said toothing sections.

7. The synchronizer ring according to claim 1, wherein the convex curvature of said two mutually opposite second edges of said engagement section is produced by means of shearing.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) FIG. 1 is a diagrammatic, perspective view of a synchronizing device; and

(2) FIG. 2 is a plan view of a blocking body shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

(3) Referring now to the figures of the drawings in detail and first, particularly to FIG. 1 thereof, there is shown a synchronizer ring S produced from steel in a perspective view. The synchronizer ring S has a main body 1, on an inside of which a first conical friction surface 2 is formed. A first end face of the main body 1 is denoted by reference sign S1, and a second end face situated opposite the first end face S1 is denoted by the reference sign S2. Toothing sections 3 extend radially outward from a circumferential section adjoining the first end face S1. A gap, from which a blocking body denoted overall by the reference sign 4 extends radially outward, is formed between each two adjacent toothing sections 3.

(4) The blocking body 4 is formed by a tab, which is connected integrally to the main body 1 and has a bent over section 5 and an engagement section 6 extending from the latter. The engagement section 6 extends in the axial direction.

(5) The synchronizing device shown in FIG. 1 furthermore has a shift collar M, which has an internal toothing 7 corresponding to the toothing sections 3. A synchronizer body K connected for conjoint rotation to a shaft (not shown here) has an external toothing 8 corresponding to the internal toothing 7. The external toothing 8 is formed in sections. Reference sign 9 denotes recesses which correspond to the engagement section 6. Finally, reference sign G denotes a gearwheel configured as a free gear, which has a second conical friction surface 10 corresponding to the first conical friction surface 2 of the synchronizer ring S.

(6) As can be seen especially from FIG. 2, the engagement section 6 has a first edge 11 extending in the circumferential direction and two mutually opposite second edges 12 extending in the axial direction. Reference sign T1 denotes a maximum first depth of the engagement section 6, which corresponds substantially to the length of the second edges 12. A second depth T2 denotes an axial distance from the first edge 11 in the direction of the bent over section 5.

(7) The first edge 11 has a first width B1. In the case of the second depth T2, a distance extending in the circumferential direction between the mutually opposite second edges 12 corresponds to the second width B2. The following relationship preferably applies to the second depth T2:
T2=T1*F,
wherein F is a factor in the range of 0.1 to 1.0, preferably 0.2 to 0.9, particularly preferably 0.3 to 0.8. That is to say that the convex curvature of the second edges 12 can be at its maximum in the vicinity of the first depth T1, for example. The greater the second depth T2 selected, the smaller is a distance A between the force application point P defined by the second width B2 and the boundary between the engagement section 6 and the bent over section 5. The smaller the distance A, the smaller are the loads acting on the bent over section 5, thereby reducing the probability of fracture of the tab.

(8) Although it is not shown in the illustrative embodiment under consideration, each of the second edges 12 can also have a plurality of convex curvatures. That is to say that the second edges 12 can also be of corrugated configuration. The convex shape of the second edges 12 can be formed by a combination of any desired curve shapes. That is to say that the second edges 12 can have asymmetrically convex shapes.

(9) The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention: 1 main body 2 first conical friction surface 3 toothing section 4 blocking body 5 bent over section 6 engagement section 7 internal toothing 8 external toothing 9 recess 10 second conical friction surface A distance B1 first width B2 second width T1 first depth T2 second depth S synchronizer ring S1 first end face of the main body 1 S2 second end face of the main body 1 M shift collar, sliding collar K synchronizer body G gearwheel, free gear, gear P force application point