Synchronizer ring structure

Abstract

This invention provides a synchronizer gear ring structure, belonging to the field of automotive parts. It solves the problem of poor lifespan of existing gear rings. This synchronizer gear ring structure includes an outer ring and an inner ring. An annular shoulder is formed on the inner wall of the lower end of the outer ring, and the bottom surface of the inner ring is pressed tightly against the annular shoulder. An annular cavity is formed between the inner ring, outer ring, and annular shoulder. A plastic ring is placed inside the annular cavity, formed by injection molding and becoming an integral part of the inner and outer rings. A first strip groove runs axially through the outer wall of the inner ring, and a second strip groove runs axially on the inner wall of the outer ring. A key block 1, matching the first strip groove, extends integrally from the inner wall of the plastic ring towards the first strip groove, and a second key block 2, matching the second strip groove, extends integrally from the outer wall of the plastic ring towards the second strip groove. This synchronizer gear ring structure has a long lifespan.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts and relates to a synchronizer, particularly a synchronizer gear ring structure. Background Technology

[0002] Synchronizer gear rings are important components of automotive transmission systems. Their structure is similar to that of a synchronizer friction ring previously proposed by the applicant (application number: 201721296178.0), which includes a conical outer ring, an inner ring on the inner side of the outer ring, a shoulder on the inner sidewall of the outer ring, one end of the inner ring abutting against the inner end face of the shoulder, and an annular groove on the inner sidewall of the other end of the outer ring. A retaining spring is provided in the annular groove and abuts against the other end face of the inner ring.

[0003] When a synchronizer gear ring is in use, the inner ring friction surface contacts the outer surface of the gear ring to be engaged. Under the action of frictional torque, the two rotate synchronously. The rotational speed of the gear to be engaged relative to the gear ring is zero. As the gear ring moves, the teeth on the gear ring engage with the teeth of the gear to be engaged, thus completing the gear shift. However, during the gear shifting operation, the movement of the gear ring will generate a certain radial impact, causing the gear ring to vibrate and collide with the gear to be engaged. There is a possibility of the gear ring teeth breaking, which affects the normal use of the synchronizer. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a synchronizer gear ring structure with a long lifespan.

[0005] The objective of this invention can be achieved through the following technical solution: a synchronizer gear ring structure, comprising an outer ring and an inner ring coaxially arranged, a gear ring formed on the lower outer wall of the outer ring, and an annular shoulder formed on the lower inner wall of the outer ring, with the bottom surface of the inner ring pressed tightly against the annular shoulder. The characteristic feature is that an annular cavity is formed between the inner ring, the outer ring, and the annular shoulder, and the annular cavity is coaxially arranged with the outer ring; a plastic ring with a shape and size matching the annular cavity is provided inside the annular cavity, and the plastic ring is formed in the annular cavity by injection molding and becomes part of the inner and outer rings. The inner ring consists of two parts: a first groove axially extending through the outer wall of the inner ring and a second groove axially arranged on the inner wall of the outer ring, with the upper end of the second groove open; both the first and second grooves connect to the aforementioned annular cavity; a key block 1 matching the first groove extends integrally from the inner wall of the plastic ring towards the first groove, with the number of key blocks 1 and the first groove being the same and their positions corresponding one-to-one; a key block 2 matching the second groove extends integrally from the outer wall of the plastic ring towards the second groove, with the number of key blocks 2 and the second groove being the same and their positions corresponding one-to-one.

[0006] The inner and outer rings are connected as a whole by injection molding of a plastic ring between them. By using key block one and slot one, and key block two and slot two to cooperate, an elastic protective layer is formed between the inner and outer rings while ensuring smooth transmission. The elasticity of the plastic ring is used to buffer the radial force transmitted from the inner ring, making the gear ring meshing process smoother, effectively reducing the probability of gear ring breakage during meshing, and improving the life of the synchronizer gear ring.

[0007] In the aforementioned synchronizer gear ring structure, a ring of connecting holes runs axially through the annular shoulder, and the upper end of each connecting hole connects to the aforementioned annular cavity. A positioning post, matching the connecting hole, is integrally formed on the plastic ring extending towards the connecting hole. The number of positioning posts and connecting holes are the same, and their positions correspond one-to-one. The connecting holes serve both to expel air from the annular cavity, ensuring stable injection molding, and to form the positioning posts, effectively improving the bonding strength between the plastic ring and the outer ring, thereby further enhancing the overall structural stability of the gear ring.

[0008] In the aforementioned synchronizer gear ring structure, the connecting hole consists of an upper hole and a lower hole arranged coaxially, with the diameter of the upper hole being smaller than the width of the annular cavity and the diameter of the lower hole. This design creates a connecting post with a smaller upper diameter and a larger lower diameter, and the upper end diameter of the connecting post is smaller than the width of the annular cavity, thus forming an axial limit and better locking the plastic ring between the inner and outer rings. This fully utilizes the buffering effect and ensures the stable achievement of extending the gear ring's lifespan.

[0009] In the synchronizer gear ring structure described above, multiple buffer holes are formed inside the plastic ring, that is, the inside of the plastic ring is hollowed out to form an air layer, so as to further enhance the buffering effect of the plastic ring.

[0010] In the aforementioned synchronizer gear ring structure, the buffer holes are straight strips extending axially along the plastic ring. Multiple buffer holes are evenly distributed circumferentially along the plastic ring, with the upper ends of the buffer holes located on the top surface of the plastic ring. The vertical arrangement of the buffer holes allows for better buffering of radial forces, thereby further extending the gear ring's lifespan.

[0011] In the synchronizer gear ring structure described above, the buffer hole is a blind hole, and the bottom surface of the buffer hole is an arc surface to ensure the overall strength of the plastic ring.

[0012] In the synchronizer gear ring structure described above, a pressure member is fixed at the upper end of the outer ring to give the inner ring a downward tendency, so as to further limit the inner ring in the axial direction and make the gear ring structure more stable.

[0013] In the synchronizer gear ring structure described above, the pressure member is ring-shaped, coaxial with the inner ring, and the bottom surface of the pressure member is pressed tightly against the top surface of the inner ring.

[0014] In the synchronizer gear ring structure described above, the bottom surface of the pressure piece presses against the top surface of the plastic ring and simultaneously seals the openings of all buffer holes to prevent wear debris and other impurities from entering the buffer holes, thus ensuring that the plastic ring can stably perform its buffering effect.

[0015] The clamping component can both further limit the inner ring in the axial direction to enhance the stability of the toothed ring structure, and also be used to seal the opening of the buffer hole. In this application, the clamping component has a dual function, simplifying the structure and facilitating assembly.

[0016] In the synchronizer gear ring structure described above, the pressure component is a ring-shaped retaining circlip, and a ring-shaped retaining circlip groove is formed on the inner wall of the outer ring for mounting the retaining circlip. This design offers the advantages of simple structure and convenient assembly.

[0017] As another option, in the synchronizer gear ring structure described above, the pressure members are multiple pressure blocks evenly distributed along the circumference of the outer ring, and each pressure block is pressed tightly against the top surface of the inner ring.

[0018] Compared with existing technologies, the synchronizer gear ring structure has the following advantages:

[0019] 1. The inner and outer rings are completely connected as a whole by injection molding of a plastic ring between them. By using key block one and slot one, and key block two and slot two to cooperate, a layer of elastic protection is formed between the inner and outer rings while ensuring smooth transmission. The elasticity of the plastic ring is used to buffer the radial force transmitted from the inner ring, making the gear ring meshing process smoother, effectively reducing the probability of gear ring breakage during meshing, and improving the life of the synchronizer gear ring.

[0020] 2. The connecting hole is used to expel air from the annular cavity, ensuring a stable injection molding process, and can also form positioning posts to effectively improve the bonding strength between the plastic ring and the outer ring, thereby further enhancing the overall structural stability of the toothed ring.

[0021] 3. The clamping component can further limit the inner ring in the axial direction to enhance the stability of the toothed ring structure, and it can also be used to seal the opening of the buffer hole. In other words, in this application, the clamping component has a dual function, which simplifies the structure and facilitates assembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the synchronizer gear ring structure.

[0023] Figure 2 This is a schematic diagram of the outer ring structure.

[0024] Figure 3 This is a schematic diagram of the structure of a plastic ring.

[0025] Figure 4 This is a schematic diagram of the inner ring structure.

[0026] In the diagram, 1. Outer ring; 1a. Gear ring; 1b. Annular shoulder; 1c. Strip groove two; 1d. Connecting hole; 1d1. Upper hole; 1d2. Lower hole; 2. Inner ring; 2a. Separating groove; 2b. Strip groove one; 3. Plastic ring; 3a. Key block one; 3b. Key block two; 3c. Positioning post; 3d. Buffer hole; 4. Pressing part. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] Example 1

[0029] like Figure 1 As shown, the synchronizer gear ring structure includes an outer ring 1 and an inner ring 2 arranged coaxially.

[0030] in,

[0031] A toothed ring 1a is formed on the outer wall of the lower end of the outer ring 1, and a toothed ring 1a is formed on the inner wall of the lower end of the outer ring 1.

[0032] An annular shoulder 1b is coaxially arranged with the outer ring 1, and the two are integrated.

[0033] structure.

[0034] The inner ring 2 is located within the outer ring 1, and the bottom surface of the inner ring 2 is pressed tightly against the annular shoulder 1b. In the actual product, the inner surface of the inner ring 2 is provided with friction texture, and a dividing groove 2a runs vertically through the inner surface of the inner ring 2, dividing the friction texture into multiple small blocks evenly distributed along the circumference of the inner ring 2.

[0035] like Figure 2 , Figure 3 and Figure 4 As shown, an annular cavity is formed between the inner ring 2, the outer ring 1, and the annular shoulder 1b, and the annular cavity is arranged coaxially with the outer ring 1. A plastic ring 3 with a shape and size that matches the annular cavity is provided inside the annular cavity. The plastic ring 3 is formed in the annular cavity by injection molding and is integrated with the inner ring 2 and the outer ring 1. To further explain, a ring of strip groove 2b runs axially through the outer wall of the inner ring 2, and a ring of strip groove 1c runs axially through the inner wall of the outer ring 1, with the upper end of the strip groove 1c open; both the strip groove 2b and the strip groove 1c are connected to the aforementioned annular cavity; the inner wall of the plastic ring 3 extends towards the strip groove 2b and is integrally formed with a key block 3a that matches the strip groove 2b, the number of key blocks 3a and the strip groove 2b are the same and their positions correspond one-to-one; the outer wall of the plastic ring 3 extends towards the strip groove 1c and is integrally formed with a key block 3b that matches the strip groove 1c, the number of key blocks 3b and the strip groove 1c are the same and their positions correspond one-to-one.

[0036] The inner ring 2 and the outer ring 1 are completely connected as a whole by a plastic ring 3 formed by injection molding. The key block 3a and the strip groove 2b and the key block 3b and the strip groove 1c are used to cooperate to ensure smooth transmission between the inner ring 2 and the outer ring 1. An elastic protective layer is formed between the inner ring 2 and the outer ring 1. The elasticity of the plastic ring 3 is used to buffer the radial force transmitted from the inner ring 2, making the meshing process of the gear ring 1a smoother, effectively reducing the probability of the gear ring 1a breaking during meshing, and improving the life of the synchronizer gear ring.

[0037] To further explain, a ring of connecting holes 1d runs axially through the annular shoulder 1b, and the upper end of each connecting hole 1d is connected to the aforementioned annular cavity. The plastic ring 3 extends towards the connecting holes 1d and is integrally formed with positioning posts 3c that match the connecting holes 1d. The number of positioning posts 3c and connecting holes 1d are the same, and their positions correspond one-to-one. The connecting holes 1d serve both to expel air from the annular cavity, ensuring stable injection molding, and to form the positioning posts 3c, effectively improving the bonding strength between the plastic ring 3 and the outer ring 1, thereby further enhancing the overall structural stability of the toothed ring.

[0038] The structure of connecting hole 1d is as follows: Connecting hole 1d consists of an upper hole 1d1 and a lower hole 1d2 arranged coaxially, with the upper hole 1d1 connected to the small hole. The diameter of the upper hole 1d1 is smaller than the width of the annular cavity and the diameter of the lower hole 1d2. In this configuration, the connecting post has a smaller upper diameter and a larger lower diameter, with the upper end diameter of the connecting post being smaller than the width of the annular cavity, thus forming an axial limit. This better locks the plastic ring 3 between the inner ring 2 and the outer ring 1, fully utilizing the buffering effect and stably achieving the goal of extending the life of the gear ring.

[0039] like Figure 1 and Figure 3 As shown, multiple buffer holes 3d are formed inside the plastic ring 3, meaning that the interior of the plastic ring 3 is partially hollowed out to form an air layer, further enhancing the buffering effect of the plastic ring 3. Preferably, the buffer holes 3d are straight strips extending along the axial direction of the plastic ring 3. The buffer holes 3d are blind holes, and their bottom surfaces are arc-shaped to ensure the overall strength of the plastic ring 3. The multiple buffer holes 3d are evenly distributed around the circumference of the plastic ring 3, and the upper ends of the buffer holes 3d are located on the top surface of the plastic ring 3. The buffer holes 3d are vertically arranged, which can better buffer radial forces, thereby further extending the life of the toothed ring.

[0040] To further enhance the positioning strength of the inner ring 2, this application also fixes a pressure member 4 at the upper end of the outer ring 1 to give the inner ring 2 a downward movement tendency, so as to further limit the inner ring 2 in the axial direction and make the toothed ring structure more stable.

[0041] Preferably, the pressing member 4 is annular, coaxial with the inner ring 2, and its bottom surface is pressed tightly against the top surface of the inner ring 2. Further, the bottom surface of the pressing member 4 also presses against the top surface of the plastic ring 3 and simultaneously seals all the openings of the buffer holes 3d to prevent wear debris and other impurities from entering the buffer holes 3d, thus ensuring the stable buffering effect of the plastic ring 3. The pressing member 4 not only further limits the inner ring 2 axially, enhancing the stability of the toothed ring structure, but also seals the openings of the buffer holes 3d. Therefore, in this application, the pressing member 4 has a dual function, simplifying the structure and facilitating assembly.

[0042] In the actual product, the pressing component 4 is a ring-shaped retaining spring, and a ring-shaped retaining spring groove is formed on the inner wall of the outer ring 1 for installing the ring-shaped retaining spring. The above design has the advantages of simple structure and convenient assembly.

[0043] Example 2

[0044] The structure and principle of this embodiment 2 are basically the same as those of embodiment 1. The difference is that the pressure member 4 consists of multiple pressure blocks evenly distributed along the circumference of the outer ring 1, and each pressure block is pressed tightly against the top surface of the inner ring 2.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A synchronizer gear ring structure, comprising an outer ring (1) and an inner ring (2) coaxially arranged, wherein a gear ring (1a) is formed on the lower outer wall of the outer ring (1), and an annular shoulder (1b) is formed on the lower inner wall of the outer ring (1), and the bottom surface of the inner ring (2) is pressed tightly against the annular shoulder (1b), characterized in that, An annular cavity is formed between the inner ring (2), the outer ring (1), and the annular shoulder (1b), and the annular cavity is arranged coaxially with the outer ring (1); a plastic ring (3) with a shape and size matching the annular cavity is provided in the annular cavity. The plastic ring (3) is formed in the annular cavity by injection molding and forms a whole with the inner ring (2) and the outer ring (1); a strip groove 1 (2b) is axially penetrating on the outer side wall of the inner ring (2), and a strip groove 2 (1c) is axially provided on the inner side wall of the outer ring (1), and the upper end of the strip groove 2 (1c) is open; both the strip groove 1 (2b) and the strip groove 2 (1c) are connected to the above-mentioned annular cavity; The inner wall of the plastic ring (3) extends towards the direction of the first strip groove (2b) and is integrally formed with a key block (3a) that matches the first strip groove (2b). The number of key blocks (3a) and the first strip groove (2b) are the same and their positions correspond one-to-one. The outer wall of the plastic ring (3) extends towards the direction of the second strip groove (1c) and is integrally formed with a key block (3b) that matches the second strip groove (1c). The number of key blocks (3b) and the second strip groove (1c) are the same and their positions correspond one-to-one. A ring of connecting holes (1d) runs through the annular shoulder (1b) axially, and the upper end of each connecting hole (1d) is connected to the aforementioned annular cavity. The plastic ring (3) extends towards the connecting hole (1d) and is integrally formed with a positioning post (3c) that matches the connecting hole (1d). The number of positioning posts (3c) and connecting holes (1d) are the same and their positions correspond one-to-one. The connecting hole (1d) is composed of an upper hole (1d1) and a lower hole (1d2) arranged coaxially, and the diameter of the upper hole (1d1) is smaller than the width of the annular cavity and the diameter of the lower hole (1d2). The plastic ring (3) has multiple buffer holes (3d) formed inside; the buffer holes (3d) are blind holes, and the bottom surface of the buffer holes (3d) is an arc surface; The outer ring (1) is fixed with a pressure member (4) that causes the inner ring (2) to move downward. The pressure member (4) is annular and coaxial with the inner ring (2). The bottom surface of the pressure member (4) is pressed tightly against the top surface of the inner ring (2). The bottom surface of the pressure member (4) is also pressed against the top surface of the plastic ring (3) and simultaneously seals the openings of all buffer holes (3d).

2. The synchronizer gear ring structure according to claim 1, characterized in that, The buffer hole (3d) is straight and extends along the axial direction of the plastic ring (3). Multiple buffer holes (3d) are evenly distributed around the plastic ring (3), and the upper port of the buffer hole (3d) is located on the top surface of the plastic ring (3).

3. The synchronizer gear ring structure according to claim 1, characterized in that, The pressing element (4) is a ring snap ring, and the inner wall of the outer ring (1) is provided with a ring-shaped snap ring groove for installing the ring snap ring.

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