Main shaft gear positioning structure of double-countershaft transmission

Abstract

The utility model discloses a main shaft gear positioning structure of a double-countershaft transmission, which belongs to the technical field of gear positioning and comprises a main shaft with an external spline and a plurality of clamping grooves. The inner ring of the main shaft gear is of a stepped structure, the second inner ring face is slidably arranged on the outer side of the outer spline of the main shaft in a sleeving mode, and the first inner ring face is provided with an inner spline; the sliding sleeves are provided with internal splines and external splines; the plurality of large spacer bushes and the plurality of small spacer bushes respectively comprise two semicircular rings clamped in the clamping grooves; the outer side of the large spacer bush is radially limited through the main shaft gear, an annular groove is formed in the outer side of the small spacer bush, and an elastic clamping sleeve is clamped in the annular groove. An internal spline on the main shaft gear can be matched with an external spline on the sliding sleeve capable of axially sliding, so that rotation limiting is realized; and one main shaft gear is axially positioned through two spacer bushes. The overall structure is simple and compact, machining is easy to achieve, assembling is convenient and reliable, the risk that the hexagonal key is cut off and the problem of repeated assembling can be effectively solved, and practicability is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear positioning, and particularly relates to a positioning structure for the main shaft gear of a double countershaft transmission. Background Art

[0002] A double countershaft transmission is a type of transmission widely used in heavy vehicles. Its main feature is that it has two independent countershaft structures. This design enables the transmission to provide more gear selection and more flexible power distribution. Through its complex structural design, the double countershaft transmission provides higher power efficiency and better handling performance in heavy vehicles. This type of transmission is usually used in application scenarios that require high torque output and frequent gear shifting, such as heavy trucks and construction machinery.

[0003] The main shaft gear of the transmission is a key component in the transmission system, and its design and function have an important impact on the performance of the entire transmission.

[0004] The traditional axial positioning method of the main shaft gear of a double countershaft heavy-duty transmission is to use a spline spacer and a hexagonal key to jointly form a stepped structure on the main shaft to achieve the axial positioning of the main shaft gear of the transmission. Due to the action of force during the power transmission and gear shifting of the main shaft gear of the transmission, there is a risk that the hexagonal key may be cut off, and during the assembly process, the spline spacer needs to be rotated by one spline tooth, and finally a hexagonal key is assembled uniformly. The spline spacer is prone to rotation during the assembly process, resulting in repeated assembly, time-consuming and laborious, and reducing the assembly efficiency.

[0005] For example, the patent number: 201210307152.7 discloses a main shaft assembly of a double intermediate shaft transmission, which uses a main shaft gear retaining ring, a main shaft gear spacer, a spline retaining ring, a hole-flattened wire retaining ring, each gear on the main shaft, a hexagonal key and the main shaft to cooperate with each other to achieve axial positioning. This main shaft assembly uses a single flat hexagonal key and realizes its radial positioning through the mutual meshing between the main and countershaft gears. There is a risk that the hexagonal key may be cut off and the spline spacer may rotate. Summary of the Utility Model

[0006] In order to solve the problem that the traditional axial positioning method of the main shaft gear of a double countershaft heavy-duty transmission is to use a spline spacer and a hexagonal key to jointly form a stepped structure on the main shaft to achieve the axial positioning of the main shaft gear of the transmission, resulting in a risk that the hexagonal key may be cut off, and the spline spacer is prone to rotation during the assembly process, leading to repeated assembly, time-consuming and laborious, and reducing the assembly efficiency, the utility model provides a positioning structure for the main shaft gear of a double countershaft transmission.

[0007] The utility model is realized by the following technical solutions:

[0008] A positioning structure for the main shaft gear of a double countershaft transmission, comprising:

[0009] The main shaft is provided with external splines and several clamping grooves thereon.

[0010] Several main shaft gears, the inner ring of which has a stepped structure, including a first inner ring surface and a second inner ring surface. The diameter of the first inner ring surface is larger than that of the second inner ring surface. The second inner ring surface is slidably sleeved on the outside of the external splines of the main shaft, and internal splines are provided on the first inner ring surface.

[0011] Several sliding sleeves are provided with internal splines that cooperate with the external splines on the main shaft and external splines that cooperate with the internal splines on the main shaft gears.

[0012] Several large spacers and several small spacers, each including two semi-circular rings that are clamped in the clamping grooves and can abut against the main shaft gears to axially limit the main shaft gears. The outside of the large spacer is radially limited by the main shaft gear, and an annular groove is provided on the outside of the small spacer, and an elastic bushing is clamped in the annular groove.

[0013] A further improvement of the present utility model is that an internal spline is provided in the middle of the inner ring of the sliding sleeve, and a groove is provided in the middle of the external spline of the sliding sleeve.

[0014] A further improvement of the present utility model is that a shaft hole is provided at the axial center line position inside the main shaft, and a radial oil hole communicating with the shaft hole is provided on the main shaft.

[0015] A further improvement of the present utility model is that the oil hole extends outward to the root of the external splines of the main shaft.

[0016] A further improvement of the present utility model is that the external splines on the main shaft have an axially through structure.

[0017] A further improvement of the present utility model is that the large spacer and the clamping groove are in a transition fit.

[0018] A further improvement of the present utility model is that the small spacer and the clamping groove are in a transition fit.

[0019] A further improvement of the present utility model is that the two semi-circular rings of the large spacer are formed by integral circular processing, cutting grooves and breaking.

[0020] A further improvement of the present utility model is that the two semi-circular rings of the small spacer are formed by integral circular processing, cutting grooves and breaking.

[0021] A further improvement of the present utility model is that a first sliding sleeve, a first large spacer sleeve, a first main shaft gear, a second large spacer sleeve, a second main shaft gear, a first small spacer sleeve, a second sliding sleeve, a third large spacer sleeve, a third main shaft gear and a second small spacer sleeve are sequentially installed on the main shaft; the outer sides of the first large spacer sleeve and the third large spacer sleeve are radially limited by the top of the internal spline of the first main shaft gear and the top of the internal spline of the third main shaft gear respectively; a stepped hole capable of radially limiting the outer side of the second large spacer sleeve is provided on one side of the second main shaft gear close to the first main shaft gear, and both sides of the second large spacer sleeve are abutted and limited with the first main shaft gear and the second main shaft gear respectively.

[0022] As can be seen from the above technical solutions, the beneficial effects of the present utility model are as follows:

[0023] The internal spline on the main shaft gear can cooperate with the external spline on the axially slidable sliding sleeve to achieve rotational limitation; an axial positioning of a main shaft gear is realized through two spacer sleeves. Both the large spacer sleeve and the small spacer sleeve include snap-fastened semi-circular rings. The outer side of the large spacer sleeve is radially limited by the top of the corresponding internal spline of the main shaft gear or the stepped hole, and the outer side of the small spacer sleeve is radially limited by the engaged elastic retaining sleeve. The overall structure is simple and compact, easy to process, convenient and reliable to assemble, can effectively avoid the risk of the hexagon key being cut off and the problem of repeated assembly, and has good practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a specific embodiment of the present utility model.

[0026] Figure 2 It is a partially enlarged schematic diagram of a specific embodiment of the present utility model.

[0027] Figure 3 It is a schematic diagram of the processing of the large spacer sleeve of a specific embodiment of the present utility model.

[0028] In the drawings: 1. First sliding sleeve, 2. Main shaft, 3. First large spacer sleeve, 4. First main shaft gear, 5. Second large spacer sleeve, 6. First small spacer sleeve, 7. First elastic retaining sleeve, 8. Second main shaft gear, 9. Second sliding sleeve, 10. Third main shaft gear, 11. Third large spacer sleeve, 12. Second elastic retaining sleeve, 13. Second small spacer sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to make the objectives, features, and advantages of the present utility model more obvious and understandable, the following will clearly and completely describe the technical solutions in the present utility model with reference to the accompanying drawings in the specific embodiments. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0030] As Figure 1-2 shown, the present utility model discloses a positioning structure for the main shaft gear of a double countershaft transmission, including:

[0031] A main shaft 2, which is provided with an external spline and several annular clamping grooves;

[0032] Several main shaft gears, the inner ring of which has a stepped structure, including a first inner ring surface and a second inner ring surface. The diameter of the first inner ring surface is larger than that of the second inner ring surface. The second inner ring surface is slidably sleeved outside the external spline of the main shaft 2, and an internal spline is provided on the first inner ring surface;

[0033] Several sliding sleeves, which are provided with an internal spline that mates with the external spline on the main shaft 2 and an external spline that mates with the internal spline on the main shaft gear;

[0034] Several large spacer sleeves and several small spacer sleeves, each of which includes two semi-circular rings that are clamped in the clamping grooves and can abut against the main shaft gear to axially limit the main shaft gear; the outside of the large spacer sleeve is radially limited by the main shaft gear, and an annular groove is provided on the outside of the small spacer sleeve, and an elastic retaining sleeve is clamped in the annular groove.

[0035] The internal spline on the main shaft gear can cooperate with the external spline on the axially slidable sliding sleeve to achieve rotational limitation; one main shaft gear is axially positioned by two spacer sleeves. Both the large spacer sleeve and the small spacer sleeve include mating semi-circular rings. The outside of the large spacer sleeve is radially limited by the top of the corresponding internal spline of the main shaft gear or the stepped hole, and the outside of the small spacer sleeve is radially limited by the clamped elastic retaining sleeve. The overall structure is simple, compact, easy to process, convenient and reliable to assemble, can effectively avoid the risk of the hexagonal key being cut off and the problem of repeated assembly, and has good practicability.

[0036] Among them, an internal spline is provided in the middle of the inner ring of the sliding sleeve, and a groove is provided in the middle of the external spline of the sliding sleeve. The flexible axial movement of the sliding sleeve is realized through the groove, so as to control the rotational engagement limitation of different main shaft gears.

[0037] Among them, a shaft hole is provided at the axial center line position inside the main shaft 2, and a radial oil hole communicating with the shaft hole is provided on the main shaft 2. Good lubrication of the main shaft gear is achieved.

[0038] Furthermore, the oil hole extends outward to the root of the external spline of the main shaft 2. The design is reasonable and the processing is convenient.

[0039] Among them, the external spline on the main shaft 2 has an axially penetrating structure, which is easy to machine and has good practicability.

[0040] Among them, the large spacer sleeve and the card slot are in transitional fit, and the small spacer sleeve and the card slot are in transitional fit. The assembly, disassembly and installation are convenient, and the clamping is reliable.

[0041] Among them, the two semi-circular rings of the large spacer sleeve are formed by integral circular machining, grooving and breaking. As Figure 3 shown, the small spacer sleeve is integrally machined before assembly, grooved after machining, and a certain amount is reserved in the groove to ensure that the two semi-circular rings can be connected together. When assembling, break along the groove opening, which can ensure that the two semi-circular rings have the same thickness and are easy to machine.

[0042] Among them, the two semi-circular rings of the small spacer sleeve are formed by integral circular machining, grooving and breaking. The machining form of the small spacer sleeve is similar to that of the large spacer sleeve. The small spacer sleeve with an annular groove is integrally machined, grooved after machining, and a certain amount is reserved in the groove to ensure that the two semi-circular rings can be connected together. When assembling, break along the groove opening, which can ensure that the two semi-circular rings have the same thickness and are easy to machine.

[0043] As Figure 1 shown, a first sliding sleeve 1, a first large spacer sleeve 3, a first main shaft gear 4, a second large spacer sleeve 5, a second main shaft gear 8, a first small spacer sleeve 6, a second sliding sleeve 9, a third large spacer sleeve 11, a third main shaft gear 10, and a second small spacer sleeve 13 are sequentially installed on the main shaft 2; the outer sides of the first large spacer sleeve 3 and the third large spacer sleeve 11 are radially limited by the top of the internal spline of the first main shaft gear 4 and the top of the internal spline of the third main shaft gear 10 respectively; a stepped hole capable of radially limiting the outer side of the second large spacer sleeve 5 is provided on one side of the second main shaft gear 8 close to the first main shaft gear 4, and both sides of the second large spacer sleeve 5 are abutted and limited with the first main shaft gear 4 and the second main shaft gear 8 respectively. A first elastic clamping sleeve 7 is clamped in the annular groove on the outer side of the first small spacer sleeve 6, and a second elastic clamping sleeve 12 is clamped in the annular groove on the outer side of the second small spacer sleeve 13.

[0044] The first main shaft gear 4 is axially limited by the first large spacer sleeve 3 and the second large spacer sleeve 5, the second main shaft gear 8 is axially limited by the first main shaft gear 4 and the first small spacer sleeve 6, and the third main shaft gear 10 is axially limited by the third large spacer sleeve 11 and the second small spacer sleeve 13. The reliability and convenience of axially positioning the main shaft gear are realized.

[0045] For the positioning structure of the main shaft gear of this double countershaft transmission, the internal spline on the main shaft gear can cooperate with the external spline on the axially slidable sliding sleeve to achieve rotational limit; one main shaft gear is axially positioned by two spacer sleeves. Both the large spacer sleeve and the small spacer sleeve include snap-together semi-circular rings. The outer side of the large spacer sleeve is radially limited by the top of the corresponding internal spline of the main shaft gear or the stepped hole, and the outer side of the small spacer sleeve is radially limited by the engaged elastic retaining sleeve. The overall structure is simple, compact, easy to process, convenient and reliable to assemble, can effectively avoid the risk of the hexagonal key being cut off and the problem of repeated assembly, and has good practicability.

[0046] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0047] Terms such as "upper", "lower", "outer side", "inner side" in the specification, claims and above-mentioned drawings of the present utility model, if any, are used to distinguish the relative relationship in position and do not need to be qualitatively defined. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A positioning structure for the main shaft gear of a double countershaft transmission, characterized in that, Including: A main shaft (2) is provided with external splines and several card slots thereon; Several main shaft gears, the inner ring of which has a stepped structure, including a first inner ring surface and a second inner ring surface. The diameter of the first inner ring surface is larger than that of the second inner ring surface. The second inner ring surface is slidably sleeved on the outside of the external splines of the main shaft (2), and internal splines are provided on the first inner ring surface; Several sliding sleeves are provided with internal splines matching the external splines on the main shaft (2) and external splines matching the internal splines on the main shaft gears; Several large spacer sleeves and several small spacer sleeves, each including two semi-circular rings clamped in the card slots, capable of abutting against the main shaft gears and axially limiting the main shaft gears; The outside of the large spacer sleeve is radially limited by the main shaft gear, and an annular groove is provided on the outside of the small spacer sleeve, and an elastic retaining sleeve is clamped in the annular groove.

2. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, characterized in that, An internal spline is provided in the middle of the inner ring of the sliding sleeve, and a groove is provided in the middle of the external splines of the sliding sleeve.

3. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, characterized in that, An axial center line position inside the main shaft (2) is provided with a shaft hole, and a radial oil hole communicating with the shaft hole is provided on the main shaft (2).

4. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 3, characterized in that, The oil hole extends outward to the root of the external splines of the main shaft (2).

5. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, wherein, The external splines on the main shaft (2) are of an axially through structure.

6. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, characterized in that The large spacer sleeve and the card slot are in a transition fit.

7. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, wherein The small spacer sleeve and the card slot are in a transition fit.

8. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, characterized in that, The two semi-circular rings of the large spacer sleeve are formed by cutting a groove in an integral annular shape and breaking it.

9. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, characterized in that, The two semi-circular rings of the small spacer sleeve are formed by cutting a groove in an integral annular shape and breaking it.

10. The positioning structure of the main shaft gear of the double countershaft transmission according to claim 1, characterized in that, A first sliding sleeve (1), a first large spacer sleeve (3), a first main shaft gear (4), a second large spacer sleeve (5), a second main shaft gear (8), a first small spacer sleeve (6), a second sliding sleeve (9), a third large spacer sleeve (11), a third main shaft gear (10) and a second small spacer sleeve (13) are successively installed on the main shaft (2); The outside of the first large spacer sleeve (3) and the outside of the third large spacer sleeve (11) are respectively radially limited by the top of the internal splines of the first main shaft gear (4) and the top of the internal splines of the third main shaft gear (10); A stepped hole capable of radially limiting the outside of the second large spacer sleeve (5) is provided on one side of the second main shaft gear (8) close to the first main shaft gear (4), and both sides of the second large spacer sleeve (5) are respectively abutted and limited by the first main shaft gear (4) and the second main shaft gear (8).

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