CN220378678U - Transmission jackshaft subassembly connection structure - Google Patents
Transmission jackshaft subassembly connection structure Download PDFInfo
- Publication number
- CN220378678U CN220378678U CN202320221101.6U CN202320221101U CN220378678U CN 220378678 U CN220378678 U CN 220378678U CN 202320221101 U CN202320221101 U CN 202320221101U CN 220378678 U CN220378678 U CN 220378678U
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- Prior art keywords
- intermediate shaft
- spline
- cylindrical surface
- connecting structure
- assembly
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- 230000005540 biological transmission Effects 0.000 title abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Gears, Cams (AREA)
Abstract
A connecting structure of a transmission intermediate shaft assembly is characterized in that an outer stepped connecting structure is arranged on an intermediate shaft, a through mounting hole is formed in a primary driven gear, an inner stepped connecting structure matched with the intermediate shaft is arranged in the mounting hole, and the inner stepped connecting structure of the primary driven gear is sleeved on the outer stepped connecting structure of the intermediate shaft. The utility model divides the matching surface of the intermediate shaft assembly into two sections, wherein the former section is a regular and complete cylindrical surface, and the sections are in interference fit; the latter segment is a spline, which segment employs a clearance fit. Compared with the prior art adopting the whole spline interference assembly, the assembly method has the advantages that the assembly difficulty is greatly reduced, the assembly efficiency is improved, the assembly error is smaller, and meanwhile, the use reliability is considered.
Description
Technical Field
The utility model relates to the field of new energy automobiles, in particular to an intermediate shaft assembly structure of an automobile transmission.
Background
In an automotive transmission, an intermediate shaft assembly is comprised of an intermediate shaft and a primary driven gear. The primary driven gear is connected with the intermediate shaft in a matched mode through a spline, and the spline is in interference with a large diameter or interference with a key side or interference with the large diameter and the key side simultaneously, so that power and torque can be transmitted. Because the spline is complex in shape, not only has no gap but also has certain interference magnitude, and the assembly is difficult and laborious; in order to improve the assembly precision, the spline precision is improved, so that the manufacturing cost is increased, and the assembly process is increased.
Disclosure of Invention
The utility model aims to solve the technical problems that: how to ensure reliable use and simultaneously greatly reduce the processing difficulty and the assembly difficulty of the intermediate shaft assembly, thereby reducing the manufacturing cost and improving the assembly efficiency.
The technical scheme provided by the utility model is as follows: a connecting structure of a transmission intermediate shaft assembly is characterized in that an outer stepped connecting structure is arranged on an intermediate shaft, a through mounting hole is formed in a primary driven gear, an inner stepped connecting structure matched with the intermediate shaft is arranged in the mounting hole, and the inner stepped connecting structure of the primary driven gear is sleeved on the outer stepped connecting structure of the intermediate shaft.
Preferably, the outer stepped connecting structure arranged on the intermediate shaft comprises an outer cylindrical surface and an outer spline, and the outer cylindrical surface and the outer spline are integrally formed and arranged on the intermediate shaft.
Preferably, the outer cylindrical surface is disposed in front of the outer spline, and the outer cylindrical surface has a size greater than that of the outer spline.
Preferably, the inner stepped connection structure comprises an inner cylindrical surface and an inner spline, the inner cylindrical surface is arranged in front of the inner spline, and the size of the inner cylindrical surface is larger than that of the inner spline.
Preferably, the outer cylindrical surface of the intermediate shaft is connected with the inner cylindrical surface of the primary driven gear in an interference fit manner, and the inner spline of the primary driven gear is sleeved on the outer spline of the intermediate shaft in a clearance fit manner.
The beneficial technical effects of the utility model are as follows:
1. the utility model divides the matching surface of the intermediate shaft assembly into two sections, wherein the former section is a regular and complete cylindrical surface, and the sections are in interference fit; the latter segment is a spline, which segment employs a clearance fit. Compared with the prior art adopting the whole spline interference assembly, the assembly method has the advantages that the assembly difficulty is greatly reduced, the assembly efficiency is improved, the assembly error is smaller, and meanwhile, the use reliability is considered.
2. In the prior assembly mode, because the spline is in interference positioning, the requirement on spline precision is high, the large diameter of the external spline needs grinding finish machining, the internal spline has small tolerance range, the broach is frequently polished, and the service life of the tool is reduced. The utility model has the advantages that the cylindrical surface is in interference positioning, the processing is simple, the precision is better ensured, the cylindrical surface part mainly plays a role in connection, the spline fit is gapped, the spline precision requirement is not too high, the finish machining is not needed, the cutter is more durable, and the manufacturing cost is reduced.
3. Under the condition that the interference is within a certain range and the interference is the same, the old spline interference fit assembly mode needs to heat the primary driven gear, the interference fit part is a cylindrical surface, the primary driven gear does not need to be heated, and the assembly process is reduced.
Drawings
FIG. 1 is an exploded view of the overall structure of the first embodiment;
FIG. 2 is a schematic cross-sectional view of the first embodiment after assembly;
FIG. 3 is a schematic cross-sectional view of an embodiment during assembly;
in the figure: intermediate shaft 11, outer cylindrical surface 12, external spline 13, primary driven gear 21, inner cylindrical surface 22, internal spline 23, intermediate gear 3.
Detailed Description
The utility model is further described below with reference to examples and figures:
example 1
As shown in fig. 1 and 2, the intermediate shaft 11 assembly includes an intermediate shaft 11 and a primary driven gear 21, and an outer stepped connection structure is integrally formed on the intermediate shaft 11, and the outer stepped connection structure includes an outer cylindrical surface 12 and an outer spline 13. The primary driven gear 21 is provided with a through mounting hole, and an inner stepped connecting structure matched with the intermediate shaft 11 is arranged in the mounting hole and comprises an inner cylindrical surface 22 and an inner spline 23.
The front end of the intermediate shaft 11 is also integrally formed with an intermediate gear 3, the primary driven gear 21 is assembled on the intermediate shaft 11, the front end of the primary driven gear 21 is propped against the rear end of the intermediate gear 3, and the intermediate gear 3 plays a role in stopping. The outer cylindrical surface 12 of the intermediate shaft 11 is provided in front of the outer spline 13, and the outer cylindrical surface 12 is larger in size than the outer spline 13, so that the outer cylindrical surface 12 and the outer spline 13 are stepped. The inner cylindrical surface 22 of the primary driven gear 21 is provided in front of the inner spline 23, and the size of the inner cylindrical surface 22 is larger than the size of the inner spline 23, so that the inner cylindrical surface 22 and the inner spline 23 are also stepped.
The diameters of the outer cylindrical surface 12 and the inner cylindrical surface 22 are accurately set, and the sizes of the outer spline 13 and the inner spline 23 are accurately set, so that when the primary driven gear 21 is assembled on the intermediate shaft 11, the outer cylindrical surface 12 of the intermediate shaft 11 and the inner cylindrical surface 22 of the primary driven gear 21 are connected together in an interference fit mode, and the inner spline 23 of the primary driven gear 21 is sleeved on the outer spline 13 of the intermediate shaft 11 in a clearance fit mode.
As shown in fig. 2 and 3, when the intermediate shaft 11 is assembled with the primary driven gear 21, it is ensured that the inner spline 23 and the outer spline 13 of the rear section are in contact first, that is, the spline portion is aligned first, then the cylindrical portion of the front section is in contact later, and finally the intermediate shaft 11 and the primary driven gear 21 are firmly assembled together by press-fitting.
It will be apparent that several improvements or modifications may be made without departing from the principles of the utility model.
Claims (1)
1. The connecting structure of the intermediate shaft assembly of the speed changer is characterized in that an outer stepped connecting structure is arranged on the intermediate shaft, a through mounting hole is formed in a primary driven gear, an inner stepped connecting structure matched with the intermediate shaft is arranged in the mounting hole, and the inner stepped connecting structure of the primary driven gear is sleeved on the outer stepped connecting structure of the intermediate shaft; the outer stepped connecting structure arranged on the intermediate shaft comprises an outer cylindrical surface and an outer spline, and the outer cylindrical surface and the outer spline are integrally formed and arranged on the intermediate shaft; the outer cylindrical surface is arranged in front of the outer spline, and the size of the outer cylindrical surface is larger than that of the outer spline; the inner stepped connecting structure comprises an inner cylindrical surface and an inner spline, wherein the inner cylindrical surface is arranged in front of the inner spline, and the size of the inner cylindrical surface is larger than that of the inner spline; the outer cylindrical surface of the intermediate shaft is connected with the inner cylindrical surface of the primary driven gear in an interference fit mode, and the inner spline of the primary driven gear is sleeved on the outer spline of the intermediate shaft in a clearance fit mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320221101.6U CN220378678U (en) | 2023-02-15 | 2023-02-15 | Transmission jackshaft subassembly connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320221101.6U CN220378678U (en) | 2023-02-15 | 2023-02-15 | Transmission jackshaft subassembly connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220378678U true CN220378678U (en) | 2024-01-23 |
Family
ID=89566733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320221101.6U Active CN220378678U (en) | 2023-02-15 | 2023-02-15 | Transmission jackshaft subassembly connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220378678U (en) |
-
2023
- 2023-02-15 CN CN202320221101.6U patent/CN220378678U/en active Active
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