CN104728294B

CN104728294B - Synchronizer limit structure

Info

Publication number: CN104728294B
Application number: CN201510160498.2A
Authority: CN
Inventors: 薛锐
Original assignee: Tianjin Tanhas Technology Co Ltd
Current assignee: Tianjin Tanhas Technology Co Ltd
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2023-08-29
Anticipated expiration: 2035-04-07
Also published as: CN104728294A

Abstract

The invention provides a synchronizer limit structure, which comprises a tooth sleeve and a combined tooth ring, wherein a plurality of spline connecting teeth are arranged on the inner wall of the tooth sleeve, steps lower than a middle boss are respectively arranged at the front end part and the rear end part of the spline connecting teeth, a plurality of offset V-shaped grooves are arranged on the side surface of the boss opposite to the end surface of the tooth sleeve, the offset V-shaped grooves are gradually reduced along the opening direction, and the cross section of the offset V-shaped groove is in an offset V shape, namely the length of one bevel edge is longer than that of the other bevel edge; the spline of the coupling ring matches the offset V-groove. The synchronizer limiting structure increases the gear shifting comfort; the contact area is increased to the maximum extent, so that the limit is more reliable, the problem of gear dropping is avoided, and the usability of the synchronizer is improved.

Description

Synchronizer limit structure

Technical Field

The invention belongs to the field of automobile transmissions, and particularly relates to a synchronizer limiting structure.

Background

With the rapid development of the automobile industry, the overall performance of the synchronizer serving as a core part of the gearbox is directly influenced by the overall performance of the gearbox. In order to avoid the problem of failure of the synchronizer caused by gear dropping of the synchronizer, the prior synchronizer is provided with a limiting structure, as shown in fig. 1, a plurality of spline teeth 4 are arranged on a tooth sleeve 1, steps 41 are respectively arranged at the front end and the rear end of the spline teeth 4, as shown in fig. 2, the spline of a combined tooth ring 2 comprises a sharp corner line 3, and after the internal spline of the tooth sleeve 1 is meshed with the spline of the combined tooth ring 2, the sharp corner line 3 is propped against the steps 41, so as to achieve the limiting effect. The limiting mode is line-to-surface or point-to-surface contact between the sharp corner line 3 and the step 41, and the limiting function is unreliable, so that the overall working performance of the synchronizer is affected.

Disclosure of Invention

In view of the above, the present invention is directed to a synchronizer limit structure to solve the problem of unreliable synchronizer limit structure.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows: the synchronizer limiting structure comprises a tooth sleeve and a combined tooth ring, wherein a plurality of spline connecting teeth are arranged on the inner wall of the tooth sleeve, steps lower than a middle boss are respectively arranged at the front end part and the rear end part of the spline connecting teeth, a plurality of offset V-shaped grooves are arranged on the side surface of the boss, which is opposite to the end surface of the tooth sleeve, the offset V-shaped grooves are gradually reduced along the opening direction, and the cross section of each offset V-shaped groove is in an offset V shape, namely the length of one bevel edge is longer than that of the other bevel edge;

the spline of the coupling ring gear mates with the offset V-groove.

Furthermore, the limiting units are arranged in a three-way structure, namely the offset V-shaped grooves are uniformly distributed along the circumferential direction of the tooth sleeve at intervals of 120 degrees.

Further, the limiting units are arranged in a hexagonal structure, namely the offset V-shaped grooves are uniformly distributed at intervals of 60 degrees along the circumferential direction of the tooth sleeve.

Further, the longitudinal section of the offset V-shaped groove is a trapezoid, and the longer bottom side of the trapezoid is positioned at the upper part.

Furthermore, the bottom of the offset V-shaped groove is provided with an avoidance groove, and the top of the spline of the combined toothed ring can partially extend into the avoidance groove.

Further, the offset V-shaped groove is extruded by a matched die.

Compared with the prior art, the synchronizer limiting structure has the following advantages:

(1) The design of combining the toothed ring spline in the synchronizer limiting structure can increase the gear shifting comfort; through set up offset V-arrangement groove on the tooth cover, can make to combine ring gear spline and tooth cover effective combination, furthest increases area of contact to make spacing more reliable, avoid the emergence of gear-down problem, improve the performance of synchronous ware.

(2) The tooth sleeve offset V-shaped groove is manufactured by adopting an innovative profiling process, and is formed by adopting a matched die for extrusion, so that the processing precision is improved, and the influence of accumulated errors caused by processing on the tooth sleeve matching precision is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 is a schematic view of a tooth sleeve of a conventional synchronizer limit structure.

Fig. 2 is a schematic view of a combined toothed ring of a conventional synchronizer limit structure.

Fig. 3 is a schematic diagram of a front view of a tooth sleeve according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a cross-sectional view of a tooth sleeve according to an embodiment of the present invention.

Fig. 5 is a schematic view of a front view of a coupling ring gear according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a cross-sectional view of a mating state of a tooth sleeve and a coupling ring gear according to an embodiment of the present invention.

Fig. 7 is an enlarged schematic view of the portion B shown in fig. 6.

Reference numerals illustrate:

1-tooth sleeve, 2-combined tooth ring, 3-sharp corner ridge line, 4-spline connecting tooth, 41-step, 42-offset V-shaped groove, 5-contact line, 6-boss, 7-inclined plane and 8-avoidance groove.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 3-7, a synchronizer limiting structure comprises a tooth sleeve 1 and a combined tooth ring 2, wherein a plurality of spline connecting teeth 4 are arranged on the inner wall of the tooth sleeve 1, steps 41 lower than a middle boss 6 are respectively arranged at the front end part and the rear end part of the spline connecting teeth 4, a plurality of offset V-shaped grooves 42 are arranged on the side surface of the boss 6 opposite to the end surface of the tooth sleeve 1, the offset V-shaped grooves 42 are gradually reduced along the opening direction, and the cross section of the offset V-shaped grooves is in an offset V shape, namely the length of one bevel edge is longer than that of the other bevel edge;

as shown in fig. 6 and 7, the spline of the coupling ring gear 2 is matched with the offset V-shaped groove 42; after the spline of the combined toothed ring 2 is meshed with the internal spline of the toothed sleeve 1, as shown in fig. 7, the spline of the combined toothed ring 2 and the offset V-shaped groove 42 of the toothed sleeve 1 form a contact mode matched with the contact line 5, so that the contact area of the combined toothed ring 2 and the toothed sleeve 1 is increased, effective matching is realized, and the matching reliability is improved.

As shown in fig. 3, the limiting units are arranged in a three-way structure, that is, the offset V-shaped grooves 42 are uniformly distributed along the circumferential direction of the tooth sleeve 1 at intervals of 120 °.

The limiting units can also be arranged in a hexagonal structure, namely, the offset V-shaped grooves 42 are uniformly distributed at intervals of 60 degrees along the circumferential direction of the tooth sleeve 1.

As shown in fig. 4, the longitudinal section of the offset V-shaped groove 42 is a trapezoid, the longer base of which is located at the upper portion.

As shown in fig. 4 and 6, the bottom of the offset V-shaped groove 42 is provided with an avoidance groove 8, and the top of the spline of the coupling gear ring 2 can partially extend into the avoidance groove 8.

The offset V-shaped groove 42 is formed by extrusion of a matched die, so that the machining precision is improved, and the influence of machining errors on the matching precision is reduced.

After the synchronizer shifts gears, the internal spline of the tooth sleeve 1 is meshed with the spline of the combined tooth ring 2, the inclined surface of the offset V-shaped groove 42 is in face-to-face contact with the inclined surface 7 on the spline of the combined tooth ring 2, the contact area is increased to the greatest extent, and the reliability of the matching of the tooth sleeve 1 and the combined tooth ring 2 is improved.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The utility model provides a synchronous ware limit structure, includes tooth cover (1) and combines ring gear (2), be equipped with a plurality of spline on tooth cover (1) inner wall and link tooth (4), preceding, the back tip of spline link tooth (4) are equipped with step (41) that are less than middle part boss (6) respectively, its characterized in that: a plurality of offset V-shaped grooves (42) are arranged on the side surface of the boss (6) opposite to the end surface of the tooth sleeve (1), the offset V-shaped grooves (42) are gradually reduced along the opening direction, and the cross section of the offset V-shaped groove is in an offset V shape, namely the length of one bevel edge is longer than that of the other bevel edge;

spline and spline of the combined toothed ring (2) -said offset V-grooves (42) are matched;

the longitudinal section of the offset V-shaped groove (42) is a trapezoid, and the longer bottom edge of the trapezoid is positioned at the upper part;

the bottom of the offset V-shaped groove (42) is provided with an avoidance groove (8), and the top of the spline of the combined tooth ring (2) can partially extend into the avoidance groove (8);

the offset V-shaped groove (42) is extruded by a matched die.

2. The synchronizer limit structure according to claim 1, wherein: the limiting units are arranged in a three-way structure, namely the offset V-shaped grooves (42) are uniformly distributed along the circumferential direction of the tooth sleeve (1) at intervals of 120 degrees.

3. The synchronizer limit structure according to claim 1, wherein: the limiting units are arranged in a hexagonal structure, namely the offset V-shaped grooves (42) are uniformly distributed at intervals of 60 degrees along the circumferential direction of the tooth sleeve (1).