Transmission reverse-climbing gear limiting structure

Abstract

A reverse-climbing gear limiting structure of a transmission comprises a first spacer ring coaxially arranged on a second shaft in a sleeving mode and located on the inner side of reverse conical teeth of a climbing gear, the end, close to a sliding sleeve, of the first spacer ring is a third limiting face, and the distance between the sliding sleeve and the third limiting face is smaller than the distance between the head of a shifting fork and the first limiting face in an upper cover opening gear. The second spacer ring is coaxially arranged on the second shaft in a sleeving mode and located on the inner side of the reverse conical tooth of the reverse gear, the end, close to the sliding sleeve, of the second spacer ring is a fourth limiting face, and the distance between the sliding sleeve and the fourth limiting face is smaller than that between the head of the shifting fork and the second limiting face in the upper cover opening. Through reasonable arrangement of component structures, axial limiting of the shifting fork is achieved, abnormal abrasion of other parts such as the shifting fork is avoided, the gear shifting performance of a transmission assembly is effectively improved, the service life of the shifting fork is greatly prolonged, and the reliability of the transmission assembly is greatly improved; the method can be applied to other different types of transmissions, and the popularization range is extremely wide.

Description

Technical Field

[0001] This utility model belongs to the field of transmission technology, specifically relating to a transmission reverse gear limiting structure. Background Technology

[0002] Gear shifting in a transmission is primarily achieved through a mechanism consisting of a shift fork, shift fork shaft, sliding sleeve, or synchronizer. The shift fork moves axially on the shift fork shaft, and the fork angle drives the sliding sleeve or synchronizer to engage with the splined gear, thus achieving gear shifting. The appropriate limiting distance of the shifting mechanism mainly determines the driver's operating comfort, and also the service life of the shift fork and other related components. For example, an inappropriate limiting distance can lead to abnormal wear of the limiting contact parts and the shift fork being under constant stress after the gear is fully engaged.

[0003] Currently, transmissions use the side distance between the two end faces of the sliding sleeve head and the opening of the upper cover housing to limit gear shifting. Taking a 13-speed transmission as an example, to solve the problem of gear skipping during upshifts and reverse gears, the sliding sleeve and gear shifter use an inverted bevel gear design, which effectively solves the skipping problem. However, the application of the inverted bevel gear ignores the shortcomings and defects of the sliding sleeve head and upper cover opening limit. That is, after the sliding sleeve and gear shifter are engaged by the inverted bevel gear, although the axial force generated by the inverted bevel structure can prevent the sliding sleeve from disengaging and solve the gear skipping problem, at this time the shift fork head and the upper cover opening limit contact, such as... Figure 1 The head of the shift fork 3 contacts and limits the first limiting surface A and the second limiting surface B within the opening of the upper cover 1. This limitation, relying on the head of the shift fork for limiting the position while the fork angle is subjected to axial force in the sliding sleeve groove, makes the shift fork equivalent to a cantilever structure. After shifting to the correct position, the shift fork remains under cantilever stress for an extended period, leading to abnormal wear of the shift fork and other components, affecting the shifting performance and reliability of the transmission assembly. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a reverse gear limiting structure for a transmission, thereby solving the problem of abnormal wear of components such as shift forks during gear shifting in existing limiting structures, which affects the shifting performance and reliability of the transmission assembly.

[0005] To achieve the above objectives, the technical solution adopted by this utility model includes:

[0006] A reverse gear limiting structure for a transmission includes a first spacer coaxially sleeved on two shafts and located inside the inverted bevel teeth of the reverse gear. The end of the first spacer near the sliding sleeve forms a third limiting surface, and the distance from the sliding sleeve to the third limiting surface is less than the distance from the shift fork head to the first limiting surface inside the upper cover opening. The transmission also includes a second spacer coaxially sleeved on two shafts and located inside the inverted bevel teeth of the reverse gear. The end of the second spacer near the sliding sleeve forms a fourth limiting surface, and the distance from the sliding sleeve to the fourth limiting surface is less than the distance from the shift fork head to the second limiting surface inside the upper cover opening.

[0007] Preferably, the sliding sleeve has a recessed stop at one end near the second spacer, the fourth limiting surface of the second spacer matches the recessed stop structure, and the distance from the sliding sleeve to the fourth limiting surface is the distance from the inner bottom of the recessed stop to the fourth limiting surface.

[0008] Preferably, the distance from the sliding sleeve to the third limiting surface is 10.562mm to 11.438mm, and the distance from the fork head to the first limiting surface inside the upper cover opening is 11.450mm to 11.894mm.

[0009] Preferably, the distance from the sliding sleeve to the third limiting surface is 11mm, and the distance from the fork head to the first limiting surface inside the upper cover opening is 11.63mm.

[0010] Preferably, the distance from the sliding sleeve to the fourth limiting surface is 10.594mm to 11.406mm, and the distance from the fork head to the second limiting surface inside the upper cover opening is 11.420mm to 11.939mm.

[0011] Preferably, the distance from the sliding sleeve to the fourth limiting surface is 11mm, and the distance from the fork head to the second limiting surface inside the upper cover opening is 11.64mm.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] (1) The reverse gear / climbing gear limiting structure of the present invention, through the reasonable setting of the component structure, the reverse gear engagement / climbing gear engagement is limited by the contact between the first spacer / second spacer on the two shafts and the sliding sleeve. The shift fork head and the first limiting surface / second limiting surface of the upper cover are always left with space to achieve axial limiting of the shift fork, avoid abnormal wear of the shift fork and other parts, effectively improve the shifting performance of the transmission assembly, and greatly improve the service life of the shift fork and the reliability of the transmission assembly.

[0014] (2) In the reverse gear limiting structure of the transmission of this utility model, the symmetrical positions on both sides of the sliding sleeve can be machined with concave stops of the same depth, which reduces the requirements for assembly and effectively solves the risk of misassembly.

[0015] (3) The reverse gear limiting structure of the transmission of this utility model can be applied to other different types of transmissions and has a very wide range of applications. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 A structural schematic diagram of the inverted bevel gear of the climbing gear and the sliding sleeve;

[0018] Figure 2 A schematic diagram of the reverse gear limiting structure of an existing 13-speed transmission;

[0019] Figure 3 This is a schematic diagram of the neutral gear structure of the 13-speed transmission in the embodiment;

[0020] Figure 4 This is a schematic diagram of the sliding sleeve structure in the embodiment;

[0021] Figure 5 This is a schematic diagram of the 13-speed transmission's shift limit in the embodiment;

[0022] Figure 6 This is a schematic diagram of the reverse gear limit of the 13-speed transmission in the embodiment.

[0023] The labels in the diagram represent:

[0024] 1-Top cover; 2-Shift fork shaft; 3-Shift fork; 4-Climbing gear; 5-First spacer washer; 6-Second shaft; 7-Hexagonal key; 8-Second spacer washer; 9-Sliding sleeve; 9-1 Recessed stop; 10-Reverse gear;

[0025] A is the first limiting surface; B is the second limiting surface; C is the third limiting surface; D is the fourth limiting surface; E is the fifth limiting surface; F is the sixth limiting surface. Detailed Implementation

[0026] The utility model is not limited to the following specific embodiments. All equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0027] It should be noted that the directional terms mentioned in this document are consistent with the specific directions on the paper in the accompanying drawings or the corresponding directions of the space shown in the drawings; all components and devices in this utility model, unless otherwise specified, are all components and devices known in the prior art.

[0028] Example

[0029] This embodiment discloses a reverse gear limiting structure for a transmission, including a first spacer 5 coaxially sleeved on the second shaft 6 and located inside the inverted bevel teeth of the reverse gear 4. The end of the first spacer 5 near the sliding sleeve 9 is a third limiting surface C, and the distance from the sliding sleeve 9 to the third limiting surface C is less than the distance from the head of the shift fork 3 to the first limiting surface A inside the opening of the upper cover 1; it also includes a second spacer 8 coaxially sleeved on the second shaft 6 and located inside the inverted bevel teeth of the reverse gear 10. The end of the second spacer 8 near the sliding sleeve 9 is a fourth limiting surface D, and the distance from the sliding sleeve 9 to the fourth limiting surface D is less than the distance from the head of the shift fork 3 to the second limiting surface B inside the opening of the upper cover 1;

[0030] Its function is as follows: when shifting into reverse gear or climbing gear, the first spacer 5 and the second spacer on the two shafts contact and limit the movement with the sliding sleeve 8. The head of the shift fork 3 and the first limiting surface A and the second limiting surface B of the upper cover always have space to achieve axial limiting of the shift fork 3, avoid abnormal wear of the shift fork 3 and other parts, effectively improve the shifting performance of the transmission assembly, greatly improve the service life of the shift fork 3 and the reliability of the transmission assembly; at the same time, it can also be applied to other different types of transmissions, with a very wide range of applications.

[0031] In this embodiment, the sliding sleeve 9 has a recessed stop 9-1 near the end of the second spacer 8. The fourth limiting surface D of the second spacer 8 matches the structure of the recessed stop 9-1, and the distance from the sliding sleeve 9 to the fourth limiting surface D is the distance from the inner bottom of the recessed stop 9-1 to the fourth limiting surface D. Figure 4 As shown, the depth of the concave stop 9-1 is 1.025mm to 1.145mm, the inner bottom of the concave stop 9-1 is the sixth limiting surface F, and the part of the end face of the sliding sleeve 9 that is not concave stop 9-1 is the fifth limiting surface E; that is, the limiting between the first spacer 5 and the sliding sleeve 9 is limited by the third limiting surface C of the first spacer 5 and the fifth limiting surface E of the sliding sleeve 9 near the end of the first spacer 5, and the limiting between the second spacer 8 and the sliding sleeve 9 is limited by the fourth limiting surface D of the second spacer 8 and the sixth limiting surface F of the sliding sleeve 9 near the end of the second spacer 8.

[0032] The fourth limiting surface D of the second spacer 8 matches the structure of the recessed stop 9-1 of the sliding sleeve 9, ensuring the strength of the right side teeth of the sliding sleeve 9 without shortening the tooth width on the right side. At the same time, the thickness of the first spacer 5 is increased from the original 6.325mm~6.375mm to 8mm~8.05mm, and the thickness of the limiting contact part between the second spacer 8 and the sliding sleeve 9 is locally increased from the original 5.325mm~5.375mm to 7.975mm~8.025mm. While achieving effective limiting of the second spacer 8 and the sliding sleeve 9, there is no need to make structural adjustments to the original first spacer 5. It only needs to be thickened proportionally, which is convenient for processing.

[0033] Meanwhile, the symmetrical positions on both sides of the sliding sleeve 9 disclosed in this embodiment can be machined with recessed stops 9-1 of the same depth, which reduces the requirements for assembly and effectively solves the risk of misassembly.

[0034] In this embodiment, the distance from the sliding sleeve 9 to the third limiting surface C is 10.562mm to 11.438mm, preferably 11mm; the distance from the head of the shift fork 3 to the first limiting surface A within the opening of the upper cover 1 is 11.450mm to 11.894mm, preferably 11.63mm. Therefore, the theoretical gap between the head of the shift fork 3 and the opening of the upper cover 1 when the gear is engaged is 0.63mm.

[0035] In this embodiment, the distance from the sliding sleeve 9 to the fourth limiting surface D is 10.594mm to 11.406mm, preferably 11mm; the distance from the head of the shift fork 3 to the second limiting surface B inside the opening of the upper cover 1 is 11.420mm to 11.939mm, preferably 11.64mm. Therefore, the theoretical gap between the head of the shift fork 3 and the opening of the upper cover 1 when reverse gear is engaged is 0.64mm.

[0036] The principle of the climbing gear limit in this embodiment is as follows: Figure 5 As shown, the shift fork 3 moves to the left on the shift fork shaft 2. The fork angle of the shift fork 3 drives the sliding sleeve 9 to move to the left and engage with the inverted bevel teeth of the climbing gear 4. The fifth limiting surface E on the left side of the sliding sleeve 9 contacts and limits the third limiting surface C on the right side of the first spacer 5, thereby realizing that the transmission is engaged in climbing gear. At this time, the left end face of the head of the shift fork 3 and the first limiting surface A on the left side of the crotch opening of the upper cover 1 are not in contact with the gap.

[0037] The principle of reverse gear limiting in this embodiment is as follows: Figure 6 As shown, the shift fork 3 moves to the right on the shift fork shaft 2. The fork angle of the shift fork 3 drives the sliding sleeve 9 to move to the right and engage with the reverse bevel teeth of the reverse gear 10. The sixth limiting surface F in the concave stop 9-1 on the right side of the sliding sleeve 9 contacts and limits the fourth limiting surface D on the left side of the second spacer 8, thereby realizing that the transmission is engaged in reverse gear. At this time, the right end face of the head of the shift fork 3 and the second limiting surface B on the right side of the crotch opening of the upper cover 1 are not in contact with the gap.

[0038] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0040] Furthermore, the various implementation methods disclosed in this solution can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content invented by this disclosure.

Claims

1. A reverse gear limiting structure for a transmission, characterized in that, Includes a first spacer (5) coaxially sleeved on the second shaft (6) and located inside the inverted bevel teeth of the climbing gear (4). The first spacer (5) has a third limiting surface (C) at the end near the sliding sleeve (9). The distance from the sliding sleeve (9) to the third limiting surface (C) is less than the distance from the head of the shift fork (3) to the first limiting surface (A) inside the opening of the upper cover (1). It also includes a second spacer (8) coaxially sleeved on the second shaft (6) and located inside the reverse bevel teeth of the reverse gear (10). The second spacer (8) is located at the end near the slide sleeve (9) as the fourth limiting surface (D). The distance from the slide sleeve (9) to the fourth limiting surface (D) is less than the distance from the head of the shift fork (3) to the second limiting surface (B) inside the opening of the upper cover (1).

2. The transmission reverse gear limiting structure as described in claim 1, characterized in that, The sliding sleeve (9) has a recessed stop (9-1) at one end near the second spacer (8). The fourth limiting surface (D) of the second spacer (8) matches the structure of the recessed stop (9-1), and the distance from the sliding sleeve (9) to the fourth limiting surface (D) is the distance from the inner bottom of the recessed stop (9-1) to the fourth limiting surface (D).

3. The transmission reverse gear limiting structure as described in claim 1 or 2, characterized in that, The distance from the sliding sleeve (9) to the third limiting surface (C) is 10.562mm to 11.438mm, and the distance from the head of the shift fork (3) to the first limiting surface (A) inside the opening of the upper cover (1) is 11.450mm to 11.894mm.

4. The transmission reverse gear limiting structure as described in claim 3, characterized in that, The distance from the sliding sleeve (9) to the third limiting surface (C) is 11mm, and the distance from the head of the shift fork (3) to the first limiting surface (A) inside the opening of the upper cover (1) is 11.63mm.

5. The transmission reverse gear limiting structure as described in claim 1 or 2, characterized in that, The distance from the sliding sleeve (9) to the fourth limiting surface (D) is 10.594mm to 11.406mm, and the distance from the head of the shift fork (3) to the second limiting surface (B) inside the opening of the upper cover (1) is 11.420mm to 11.939mm.

6. The transmission reverse gear limiting structure as described in claim 5, characterized in that, The distance from the sliding sleeve (9) to the fourth limiting surface (D) is 11mm, and the distance from the head of the shift fork (3) to the second limiting surface (B) inside the opening of the upper cover (1) is 11.64mm.

Images