Input shaft gear axial positioning structure for helical-tooth double-countershaft transmission

Abstract

The utility model provides an input shaft gear axial positioning structure for a helical-tooth double-countershaft transmission, which belongs to the field of helical-tooth double-countershaft gearboxes, and comprises an input shaft, one end of the input shaft is sequentially provided with an external spline connecting part and a bearing mounting part along the axial direction, the external spline connecting part is in spline connection with an input shaft gear, and the bearing mounting part is in spline connection with the input shaft gear. A third clamping spring groove is formed in the inner ring of the input shaft gear, and a third clamping spring is installed in the third clamping spring groove. The outer side of the bearing mounting part is sequentially sleeved with an input shaft bearing and a second-order step spacer bush in the axial direction, the large-diameter end of the second-order step spacer bush can abut against the inner ring of the input shaft bearing, and the small-diameter end of the second-order step spacer bush can abut against the side, close to the bearing mounting part, of the outer spline connecting part; and the clamp spring III is positioned between the step surface of the second-order step spacer bush and the external spline connecting part. The clamp spring has the advantages that the stress condition of the clamp spring can be effectively optimized, the reliability and durability of the whole structure are improved, and meanwhile the clamp spring has the advantages of being simple and compact in structure, convenient to machine and the like.

Description

Technical Field

[0001] The utility model belongs to the field of helical double countershaft transmissions, and particularly relates to an axial positioning structure for an input shaft gear of a helical double countershaft transmission. Background Technique

[0002] With the development trend of large horsepower engines, the market's demand for the torque-bearing capacity of transmissions is increasing, and at the same time, the market's pursuit of lightweight design for transmissions is also going hand in hand. In this context, double countershaft transmissions have quickly become the focus of transmission structure innovation by virtue of their significant advantage in reducing axial dimensions, meeting the market's demand for efficient and compact designs. At the same time, helical gear transmission structures are gradually becoming the mainstream trend in the development of transmission systems due to their excellent load-bearing capacity and transmission efficiency.

[0003] However, although the helical gear transmission structure has a high load-bearing capacity, it is also accompanied by the generation of axial forces. In the normal operating state of the double countershaft helical gear transmission structure, the input shaft gear evenly bears axial forces on both sides, so that a stable operating state can be maintained and the occurrence of tilting can be avoided. However, it should be noted that during the operation of the power take-off, the input shaft gear only bears axial force on one side and tilts under the condition of single-sided force, and then transmits the tilting force to the circlip for its axial positioning.

[0004] Facing the special situation of single-sided force, the circlip is prone to stress concentration problems due to uneven force, and in severe cases, the circlip may also face the risk of breaking due to its material properties, thus causing serious safety hazards. Summary of the Utility Model

[0005] The technical problem solved by the utility model is to provide an axial positioning structure for an input shaft gear of a helical double countershaft transmission that can effectively optimize the force condition of the circlip to ensure the reliability and durability of the overall structure.

[0006] To solve the above technical problems, the technical solution provided by the present utility model is as follows: An axial positioning structure for an input shaft gear of an inclined tooth double countershaft transmission, which includes an input shaft. One end of the input shaft is sequentially provided with an external spline connection portion and a bearing installation portion along the axial direction. An input shaft gear is spline-connected to the external spline connection portion. A snap ring groove three is provided in the inner ring of the input shaft gear, and a snap ring three is installed in the snap ring groove three; an input shaft bearing and a second-order stepped spacer sleeve are sequentially sleeved on the outer side of the bearing installation portion along the axial direction. The large-diameter end of the second-order stepped spacer sleeve can abut against the inner ring of the input shaft bearing, and the small-diameter end of the second-order stepped spacer sleeve can abut against one side of the external spline connection portion close to the bearing installation portion. The snap ring three is located between the stepped surface of the second-order stepped spacer sleeve and the external spline connection portion. At this time, since the present utility model adopts a special spacer sleeve structure, it can axially position the input shaft bearing in one direction through this spacer sleeve structure, axially position the input shaft gear in one direction through the snap ring three, and when the input shaft gear is subjected to unilateral force, the stepped surface in this spacer sleeve structure can protect the snap ring three, reduce the influence of the unilateral force on the input shaft gear on the snap ring, and prevent the risk of breakage of the snap ring three due to unilateral force tilt.

[0007] Further, an axial gap is provided between the stepped surface of the second-order stepped spacer sleeve and the snap ring three, and the input shaft gear can freely float radially through this axial gap.

[0008] Further, the inner ring of the input shaft gear is sequentially provided with an internal spline one and an internal spline two along the direction away from the input shaft bearing. The internal spline one is spline-connected to the external spline connection portion. The top diameter of the internal spline two is smaller than the root diameter of the external spline at the external spline connection portion. At this time, the present utility model can use the diameter difference between the top diameter of the internal spline two of the input shaft gear and the root diameter of the external spline provided at the external spline connection portion of the input shaft as a stop edge to realize the axial positioning of the input shaft gear at the input shaft. Moreover, compared with other axial positioning structures, this positioning structure of the present utility model also has the advantages of simple processing, reasonable structure, and easy production.

[0009] Further, there is a side gap between the internal spline one and the external spline at the external spline connection portion, and this side gap meets the radial floating requirement of the input shaft gear in the inclined tooth double countershaft transmission.

[0010] Further, a snap ring groove one is provided in the bearing installation portion, and a snap ring one is installed in the snap ring groove one. The snap ring one can abut against one end of the inner ring of the input shaft bearing away from the second-order stepped spacer sleeve and axially position the input shaft bearing in the other direction. Moreover, in the actual production and assembly process, as a preference, the present utility model can design snap rings one of various specifications and select and install them according to the actual processing size of the snap ring groove one to ensure that it can achieve accurate axial positioning.

[0011] Further, a housing is installed on the outer side of the input shaft bearing, and an end cover is installed on the outer side of the housing. The inner side of the end cover can abut against one end of the outer ring of the input shaft bearing away from the input shaft gear and axially position it.

[0012] Further, a second snap ring groove is provided on the outer surface of the outer ring of the input shaft bearing, and a second snap ring is installed in the second snap ring groove. The outer ring of the second snap ring is arranged between the end cover and the housing, and the axial positioning between the input shaft and the housing is realized through the cooperation between the second snap ring and the end cover and the housing.

[0013] Further, an installation groove is provided on the inner side of the end cover, and the outer ring of the second snap ring is located in the installation groove and contacts the bottom of the installation groove to realize axial positioning in the corresponding direction.

[0014] Further, the end cover is installed on the outer side of the housing through connecting bolts, and the number of connecting bolts can be flexibly selected according to the specific size of the housing.

[0015] Further, there is a gap between the outer ring of the input shaft bearing and the input shaft gear.

[0016] From the above technical solutions, it can be seen that the present utility model has the following advantages: Since the present utility model adopts a special spacer structure, it can axially position the input shaft bearing in one direction through this spacer structure, axially position the input shaft gear in one direction through the third snap ring, and when the input shaft gear is stressed unidirectionally, the third snap ring can be protected through the step surface in the spacer structure, reducing the influence of the unidirectional force on the input shaft gear on the snap ring, eliminating the risk of breakage of the third snap ring due to unilateral stress inclination, and ensuring that the input shaft gear can freely float radially through the axial gap between the step surface of the second-order stepped spacer and the third snap ring, reducing the wear of the third snap ring; at the same time, compared with other axial positioning structures, the structure of the present utility model for positioning the input shaft gear by changing the internal spline size also has the advantages of simple processing, reasonable structure and easy production. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for 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.

[0018] Figure 1 is a schematic structural diagram of the specific embodiment of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the cooperation between the third snap ring and the spacer in the present utility model.

[0020] In the figure: 1. Input shaft; 2. End cover; 3. Snap ring one; 4. Input shaft bearing; 5. Snap ring two; 6. Connecting bolt; 7. Housing; 8. Input shaft gear; 9. Snap ring three; 10. Second-order stepped spacer; 11. Internal spline one; 12. Internal spline two; 13. Step surface. Specific implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] As Figure 1 、 Figure 2 shown, the present invention provides an axial positioning structure for an input shaft gear of an inclined tooth double countershaft transmission, which includes an input shaft 1. One end of the input shaft 1 is sequentially provided with an external spline connection portion and a bearing installation portion along the axial direction.

[0023] Among them, a snap ring groove one, an input shaft bearing 4, and a second-order stepped spacer 10 are sequentially arranged along the axial direction on the outer side of the bearing installation portion. A snap ring one 3 is installed in the snap ring groove one, and the snap ring one 3 can abut against one end of the inner ring of the input shaft bearing 4 away from the second-order stepped spacer 10, and axially position the input shaft bearing 4 in one direction. A housing 7 is installed on the outer side of the input shaft bearing 4, and an end cover 2 is installed on the outer side of the housing 7 through a connecting bolt 6. An installation groove is provided on the inner side of the end cover 2; a snap ring groove two is provided on the outer surface of the outer ring of the input shaft bearing 4, and a snap ring two 5 is installed in the snap ring groove two. The outer ring of the snap ring two is arranged in the installation groove between the end cover 2 and the housing 7, and the axial positioning between the input shaft and the housing 7 is realized through the cooperation between the snap ring two 5 and the end cover 2 and the housing 7. The large-diameter end of the second-order stepped spacer 10 can abut against the inner ring of the input shaft bearing 4, and the small-diameter end of the second-order stepped spacer 10 can abut against one side of the external spline connection portion close to the bearing installation portion, and axially position the input shaft bearing 4 in another direction.

[0024] An input shaft gear 8 is arranged on the outer ring of the external spline connection portion. The inner ring of the input shaft gear 8 is sequentially provided with an internal spline one 11 and an internal spline two 12 along the direction away from the input shaft bearing 4. Among them, the top diameter of the internal spline two 12 is smaller than the root diameter of the external spline at the external spline connection portion, and a stop edge can be made through the diameter difference between the top diameter of the internal spline two 12 of the input shaft gear 8 and the root diameter of the external spline provided on the input shaft 1 at the external spline connection portion, so as to realize the axial positioning of the input shaft gear 8 at the input shaft 1.

[0025] The internal spline 11 is spline-connected to the external spline connecting portion, and there is a side clearance between the internal spline 11 and the external spline at the external spline connecting portion. A snap ring groove 3 is provided on the part of the internal spline 11 that is not spline-connected to the external spline connecting portion. A snap ring 9 is installed in the snap ring groove 3. The outer ring of the snap ring 9 is located between the step surface 13 of the second-order stepped spacer sleeve 10 and the external spline connecting portion, and there is an axial clearance with the step surface 13 of the second-order stepped spacer sleeve 10. At this time, since the present invention adopts a special spacer sleeve structure, it can axially position the input shaft bearing 4 in one direction through this spacer sleeve structure, axially position the input shaft gear 8 in one direction through the snap ring 9, and when the input shaft gear 8 is stressed unidirectionally, the step surface 13 in this spacer sleeve structure can protect the snap ring 9, reduce the influence of the unidirectional force on the snap ring when the input shaft gear 8 is stressed unidirectionally, and prevent the risk of breakage due to the inclination of the snap ring 9 under unidirectional stress; and ensure that the input shaft gear 8 can freely float radially through the above axial clearance, reducing the wear of the snap ring 9.

[0026] Based on this, the structure of the present invention is simple and compact, has broad prospects for popularization and application, good practicability, and can be widely applied to the field of helical double countershaft transmissions, especially for transmissions with high requirements for lightweight and load-bearing capacity. At the same time, through the axial positioning structure of the input shaft gear for the helical double countershaft transmission of the present invention, it is also possible to broaden the thinking for the design of helical double countershaft transmissions.

[0027] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and above-mentioned drawings of the present invention are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention 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.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent 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 invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An input shaft gear axial positioning structure for a helical double countershaft transmission, comprising an input shaft (1), one end of the input shaft (1) being sequentially provided with an external spline connection portion and a bearing mounting portion along the axial direction, the external spline connection portion being spline-connected with an input shaft gear (8), the inner ring of the input shaft gear (8) being provided with a third retaining ring groove, and a third retaining ring (9) being installed in the third retaining ring groove; characterized in that: An input shaft bearing (4) and a two-step stepped spacer (10) are sequentially sleeved on the outer side of the bearing mounting portion along the axial direction; the large diameter end of the two-step stepped spacer (10) can abut against the inner ring of the input shaft bearing (4); the small diameter end of the two-step stepped spacer (10) can abut against a side of the external spline connection portion close to the bearing mounting portion; and the retaining spring (9) is located between the step surface (13) of the two-step stepped spacer (10) and the external spline connection portion.

2. The input shaft gear axial positioning structure for the helical dual countershaft transmission according to claim 1, characterized in that: An axial gap is provided between the step surface (13) of the second-step stepped spacer (10) and the third retaining spring (9).

3. The input shaft gear axial positioning structure for a helical dual countershaft transmission according to claim 1 or 2, characterized in that: The inner ring of the input shaft gear (8) is provided with an inner spline 1 (11) and an inner spline 2 (12) in sequence along a direction away from the input shaft bearing (4); the inner spline 1 (11) is spline-connected to the outer spline connection portion; and the top diameter of the inner spline 2 (12) is smaller than the root diameter of the outer spline at the outer spline connection portion.

4. The input shaft gear axial positioning structure for the helical dual countershaft transmission according to claim 3, characterized in that: There is a side clearance between the internal spline 1 (11) and the external spline at the external spline connection portion.

5. The input shaft gear axial positioning structure for a helical dual countershaft transmission according to claim 1 or 2, characterized in that: The bearing mounting portion is provided with a retaining spring groove 1, in which a retaining spring 1 (3) is installed. The retaining spring 1 (3) can abut against an end of the inner ring of the input shaft bearing (4) away from the second-step stepped spacer (10).

6. The input shaft gear axial positioning structure for a helical dual countershaft transmission according to claim 1 or 2, characterized in that: A housing (7) is mounted on the outer side of the input shaft bearing (4), and an end cover (2) is mounted on the outer side of the housing (7).

7. The input shaft gear axial positioning structure for the helical dual countershaft transmission according to claim 6, characterized in that: The outer surface of the outer ring of the input shaft bearing (4) is provided with a second retaining ring groove, a second retaining ring (5) is installed in the second retaining ring groove, and the outer ring of the second retaining ring (5) is arranged between the end cover (2) and the housing (7).

8. The input shaft gear axial positioning structure for the helical dual countershaft transmission according to claim 7, characterized in that: The inner side of the end cover (2) is provided with a mounting groove, and the outer ring of the second retaining ring (5) is located in the mounting groove.

9. The input shaft gear axial positioning structure for the helical dual countershaft transmission according to claim 6, characterized in that: The end cover (2) is mounted on the outer side of the housing (7) via connecting bolts (6).

10. The input shaft gear axial positioning structure for a helical dual countershaft transmission according to claim 1 or 2, characterized in that: There is clearance between the outer ring of the input shaft bearing (4) and the input shaft gear (8).

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