Damping sleeve fixing device and gearbox

Abstract

The present application relates to the technical fields of mounting shock-absorbing sleeve, and particularly relates to a shock-absorbing sleeve fixing member and a gearbox. The shock-absorbing sleeve fixing member is used for being installed in a positioning hole of a hydraulic mechanical continuously variable gearbox, the first end of the fixing member is provided with a first step column, the first step column is provided with external threads matched with the positioning hole; the first step column is provided with a first step hole for installing the shock-absorbing sleeve, the first step hole is coaxially arranged with the first step column, and the first step hole is provided with an inner clamping groove close to the opening end. Through the shock-absorbing sleeve fixing member, the shock-absorbing sleeve and the fixing member form an integral whole, the shock-absorbing sleeve is provided with pulling force and pushing force, and the shock-absorbing sleeve can be moved together with the shock-absorbing sleeve fixing member during the installation process, compared with the existing shock-absorbing sleeve fixing member, the shock-absorbing sleeve is reduced in dismounting difficulty, the shock-absorbing sleeve does not need to be installed through knocking, and the damage and deformation of the shock-absorbing sleeve are avoided.

Description

Technical Field

[0001] This invention relates to the field of shock absorber installation technology, and in particular to a shock absorber fixing component and a gearbox. Background Technology

[0002] Hydraulic mechanical continuously variable transmissions (HMCVTs) are important components of agricultural and engineering machinery such as tractors, used to change the torque, speed, and direction of motion transmitted from the drive shaft to the driven shaft according to different working conditions.

[0003] The continuously variable transmission (CVT) in a hydraulic mechanical gearbox contains a hydrostatic unit (i.e., a pump-motor system). This unit generates vibrations during operation, which are typically reduced by damping sleeves to minimize their transmission. The hydrostatic unit has a replenishing oil seat, which is positioned within a locating hole in the CVT housing. The damping sleeve is a tubular structure; its inner hole fits around the replenishing oil seat, and its outer wall is installed within the locating hole in the gearbox housing. A damping sleeve retainer is installed at the upper end of the sleeve, locking its axial position.

[0004] The existing shock absorber sleeve fasteners are not fixedly connected to the shock absorber sleeve itself. Furthermore, the inner diameter of the shock absorber sleeve and the outer diameter of the hydrostatic unit's oil filler seat are only transition fits. When installing the shock absorber sleeve, tools are often needed to hammer it into the hydrostatic unit's oil filler seat, which can easily deform the sleeve and render it unusable. In addition, due to the tight fit between the shock absorber sleeve, the oil filler seat, and the housing positioning holes, the space is limited. Disassembling the shock absorber sleeve requires specialized tools and considerable force to remove it from the hydrostatic unit's oil filler seat, wasting time and increasing the labor intensity for workers. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a shock-absorbing sleeve fastener to solve the problem of the shock-absorbing sleeve being difficult to disassemble.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A shock absorber sleeve fixing component is used for installation in a positioning hole in the housing of a hydraulic continuously variable transmission (CVT). The fixing component has a first stepped post at its first end, and the first stepped post is provided with an external thread that mates with the positioning hole. The first stepped post has a first stepped hole for installing the shock absorber sleeve. The first stepped hole is coaxially arranged with the first stepped post, and an internal groove is provided at the end of the first stepped hole near the opening.

[0008] Preferably, the fastener is provided with a second stepped hole, which is coaxial with the first stepped hole and located on the side of the first stepped hole away from the inner slot.

[0009] Preferably, the fixing member is provided with an oil replenishment channel, one end of which is connected to the positioning hole of the gearbox housing, and the other end is connected to the second step hole.

[0010] Preferably, the oil replenishment channel includes an oil replenishment cavity, a through hole, and a third step hole. The oil replenishment cavity is an annular groove located on one side of the first step column. The third step hole is coaxial with the second step hole and is located on the side of the second step hole away from the first step hole. The through hole connects the oil replenishment cavity and the third step hole.

[0011] Preferably, a guide angle is provided at one end of the opening of the first stepped hole.

[0012] Preferably, the fastener has a second step post for positioning, the second step post being coaxial with the first step post, and the diameter of the second step post being larger than the diameter of the first step post.

[0013] Preferably, the fixing member has a rotating part that drives the fixing member to rotate, and the rotating part is located at the second end of the fixing member away from the first step post.

[0014] Preferably, the rotating part is a hexagonal prism.

[0015] This invention also provides a gearbox, on which the shock absorber mounting bracket described above is installed.

[0016] Preferably, the gearbox housing has a hydrostatic unit, the hydrostatic unit has an oil replenishment seat, the fixing member has a second stepped hole coaxial with the first stepped hole, and after the fixing member is installed into the positioning hole, the second stepped hole and the oil replenishment hole of the oil replenishment seat are connected by a connecting sleeve.

[0017] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0018] 1. The shock absorber sleeve fixing component of the present invention can install the shock absorber sleeve in the first stepped hole, and install a retaining spring in the inner groove to lock the shock absorber sleeve into the first stepped hole. The first stepped shaft, coaxial with the first stepped hole, has threads. By rotating relative to the gearbox positioning hole, it drives the shock absorber sleeve to be fitted onto or removed from the oil filler seat of the hydrostatic unit. Through the shock absorber sleeve fixing component of the present invention, the shock absorber sleeve and the fixing component form a whole, providing tension and thrust to the shock absorber sleeve, and ensuring that the shock absorber sleeve can move together with the shock absorber sleeve fixing component during installation. Compared with existing shock absorber sleeve fixing components, it reduces the difficulty of disassembling the shock absorber sleeve, eliminates the need for hammering to install the shock absorber sleeve, and avoids damage and deformation of the shock absorber sleeve.

[0019] 2. The shock absorber sleeve fixing component of the present invention, by setting an oil circuit connecting the positioning hole and the second step hole, guides the hydraulic oil with a lower temperature inside the gearbox through the oil replenishment channel to the second step hole and then into the hydrostatic unit, thereby reducing the temperature of the hydraulic oil inside the hydrostatic unit, reducing the wear of parts, and extending the service life of the gearbox.

[0020] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a cross-sectional view of the shock-absorbing sleeve fastener provided in an embodiment of the present invention;

[0024] Figure 2 This is a perspective view of the shock-absorbing sleeve fixing component provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the shock absorber sleeve fixing component provided in an embodiment of the present invention being installed on the gearbox;

[0026] In the diagram: 1. Fixing component; 11. First step post; 12. Oil filling chamber; 13. Second step post; 14. Rotating part; 15. Third step hole; 16. Through hole; 17. Second step hole; 18. First step hole; 19. Inner groove; 2. Gearbox housing; 21. Positioning hole; 3. Shock absorber sleeve; 4. Hydrostatic unit; 41. Oil filling seat; 5. Connecting sleeve;

[0027] The distances or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only. Detailed Implementation

[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] For ease of description, the terms "upper" and "lower" appearing in this invention only indicate the upper and lower directions as shown in the accompanying drawings, and do not limit the structure. They are merely for the purpose of describing the invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," etc., used in this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0031] Shock absorber sleeve: A shock-absorbing device consisting of inner and outer metal outer layers and an inner layer of shock-absorbing rubber. The shock absorber sleeve is installed inside a mechanical hydraulic continuously variable transmission (CVT) to reduce the transmission of vibrations from the hydrostatic unit.

[0032] A hydromechanical continuously variable transmission (HMCVT) splits the power input from the engine, one path through a fixed gear transmission and the other through a pump-motor system. A planetary gear set combines these two power streams, and different clutches are used to achieve varying power output levels. It's a transmission that combines the high efficiency of mechanical transmission with the continuous adjustability of hydraulic transmission. However, the hydrostatic unit generates vibrations during operation. These vibrations, transmitted to the transmission housing, can affect the normal operation of the transmission, even causing malfunctions, vibration fatigue damage to components, and shortening the transmission's lifespan. To address this issue, a damping sleeve is typically fitted onto the outside of the oil filler seat of the hydrostatic unit. The inner layer of the damping sleeve contains damping rubber, which reduces vibration transmission.

[0033] As described in the background section, the gap between the shock absorber sleeve and the oil filler seat is small. When installing the shock absorber sleeve, it is necessary to first use a tool to tap it into the oil filler seat of the hydrostatic unit before pressing it into place with the shock absorber sleeve retainer. This increases the operational difficulty and can easily cause damage and deformation to the cross-section of the shock absorber sleeve when tapping it. Furthermore, during the use of the transmission, maintenance is required, necessitating frequent disassembly of the shock absorber sleeve. Although a shock absorber sleeve retainer is installed on the outside of the sleeve, the existing structure only generates thrust between the retainer and the sleeve. Therefore, during disassembly, the retainer must be removed first before removing the sleeve itself. Since the inner ring of the shock absorber sleeve is fitted onto the oil filler seat of the hydrostatic unit, and the outer ring is embedded in the positioning hole of the transmission housing, the space is limited, making it difficult to find suitable tools for disassembly.

[0034] To solve the above-mentioned technical problems, the present invention proposes a shock-absorbing sleeve fixing component 1, such as... Figures 1-2 As shown, the shock absorber sleeve fixing component 1 is used to install in the positioning hole 21 of the gearbox housing 2. The first end of the fixing component 1 has a first stepped post 11, and the first stepped post 11 is provided with an external thread that mates with the positioning hole 21. The first stepped post 11 has a first stepped hole 18 for installing the shock absorber sleeve 3. The first stepped hole 18 is coaxially arranged with the first stepped post 11, and an inner groove 19 is provided near the opening end of the first stepped hole 18. The inner groove 19 is an annular groove for installing a retaining spring to lock the shock absorber sleeve 3. Wherein, the first end refers to Figure 1 The middle and lower end, the second end refers to Figure 1 At the upper end, the first step column 11 is a cylinder, and the first step hole 18 is a round hole.

[0035] The shock absorber sleeve of the present invention has an inner groove 19 for mounting a retaining ring at the lower end of the first stepped hole 18, and the first stepped post 11 that contacts the gearbox housing positioning hole 21 is fully threaded. Figure 3 As shown, when installing the shock absorber sleeve, first place the shock absorber sleeve in the first step hole 18 of the fixing part 1, and install the retaining spring to lock it in place. Then, align the axis of the fixing part 1 with the oil filler seat 41 of the hydrostatic unit 4. Since the outer surface of the shock absorber sleeve fixing part 1 is fully threaded, and it matches the threaded hole of the gearbox positioning hole 21, the shock absorber sleeve only contacts the oil filler seat 41 of the hydrostatic unit 4 after the shock absorber sleeve fixing part 1 is screwed into the threaded hole. By continuously tightening the threads, the shock absorber sleeve and the shock absorber sleeve fixing part 1 are installed in place together, without the need to install the shock absorber sleeve by hammering, thus avoiding damage and deformation of the shock absorber sleeve. At the same time, when it is necessary to remove the shock absorber sleeve, simply unscrew the shock absorber sleeve fixing part 1. Since there is a retaining spring between the shock absorber sleeve and the shock absorber sleeve fixing part 1, the shock absorber sleeve can move together with the shock absorber sleeve fixing part 1 under the action of the retaining spring, thereby removing the shock absorber sleeve.

[0036] The retaining ring is placed at the lower end of the shock absorber sleeve fixing part 1, which serves to support the shock absorber sleeve and provide thrust to the shock absorber sleeve when it is disassembled, thus ensuring that the shock absorber sleeve can move together with the shock absorber sleeve fixing part 1.

[0037] During the operation of the hydrostatic unit 4, the internal oil temperature is relatively high, which can cause wear on internal parts. Therefore, the shock absorber sleeve fixing component 1 of this invention is provided with a second stepped hole 17, which is coaxial with the first stepped hole 18 and located on the side of the first stepped hole 18 away from the inner groove 19. The fixing component 1 is provided with an oil supply channel, one end of which connects to the positioning hole 21 of the gearbox housing 2, and the other end connects to the second stepped hole 17. The gearbox housing 2 has an oil passage connecting to the positioning hole 21. By providing an oil passage connecting the positioning hole 21 and the second stepped hole 17, the shock absorber sleeve fixing component 1 of this invention guides the lower-temperature hydraulic oil inside the gearbox through the oil supply channel to the second stepped hole 17 and then into the hydrostatic unit 4, reducing the temperature of the hydraulic oil inside the hydrostatic unit 4, reducing wear on components, and extending the service life of the gearbox.

[0038] Specific examples Figure 1 As shown, the oil replenishment channel includes an oil replenishment chamber 12, a through hole 16, and a third stepped hole 15. The oil replenishment chamber 12 is an annular groove located on one side of the first stepped column 11. The third stepped hole 15 is coaxial with the second stepped hole 17 and is located on the side of the second stepped hole 17 away from the first stepped hole 18. The through hole 16 connects the oil replenishment chamber 12 and the third stepped hole 15. Figure 3 As shown, after installation, the annular groove of the shock absorber sleeve fixing part 1 is located in the positioning hole 21 of the gearbox. The low temperature oil in the gearbox enters the positioning hole 21 through the gearbox oil circuit, and then enters the hydrostatic unit 4 through the annular groove, the through hole 16, and the second step hole 17.

[0039] The through hole 16 is a through hole arranged around the circumference of the third step hole 15. The number, diameter and angle of the through holes 16 are reasonably selected according to the model of the gearbox and the size of the shock absorber sleeve fastener 1, which will not be elaborated here.

[0040] The annular groove of the oil filling cavity 12 has a first contour cone surface and a second contour cone surface. The first contour cone surface and the second contour cone surface are at a certain angle. The axis of the through hole 16 is perpendicular to the first contour cone surface to facilitate the machining of the through hole 16. At the same time, the annular groove can also be used as a tool relief groove when machining the external thread of the first stepped column 11.

[0041] like Figure 1As shown, a guide angle is provided at one end of the opening of the first stepped hole 18. The guide angle facilitates the installation of the shock-absorbing sleeve 3 into the first stepped hole 18 of the fastener 1. The guide angle can be 10-30 degrees, which is understandable. It can also be set to other angles according to specific circumstances, as long as it is convenient to install the shock-absorbing sleeve.

[0042] like Figure 1 , Figure 3 As shown, the fixing member 1 has a second stepped post 13 for positioning. The second stepped post 13 is a cylindrical surface. The second stepped post 13 is coaxial with the first stepped post 11, and the diameter of the second stepped post 13 is larger than the diameter of the first stepped post 11. After the shock absorber sleeve fixing member 1 is installed into the gearbox, it is gradually moved into the positioning hole 21 by rotating the fixing member 1 until the second stepped post 13 enters the positioning hole 21, thereby realizing the positioning of the shock absorber sleeve fixing member 1.

[0043] The fixing member 1 has a rotating part 14 that drives the fixing member 1 to rotate. The rotating part 14 is located at the second end of the fixing member 1 away from the first stepped post 11. The shock absorber fixing member 1 is installed into the positioning hole 21 of the gearbox by rotating the rotating part 14. It is understood that the rotating part 14 can be a protruding structure, such as a protruding plate structure or a triangular prism, a quadrangular prism, etc., or it can be a groove structure, such as a slotted groove, a cross groove, a plum blossom groove, etc. Those skilled in the art can make reasonable choices according to specific circumstances.

[0044] like Figure 2 As shown, the rotating part 14 in this embodiment is a hexagonal prism, that is, a standard hexagonal flange face, which can be rotated using a standard wrench during disassembly.

[0045] Based on the aforementioned shock absorber sleeve fixing component 1, this invention proposes a gearbox. The gearbox housing 2 contains a hydrostatic unit 4, which has an oil replenishment seat 41 with an oil replenishment hole. The fixing component 1 has a second stepped hole 17 coaxial with the first stepped hole 18. After the fixing component 1 is installed into the positioning hole 21, the second stepped hole 17 and the oil replenishment hole of the oil replenishment seat 41 are connected by a connecting sleeve 5. Figure 3 As shown, the connecting sleeve 5 is a tubular structure. One end of the inner hole is connected to the third step hole 15, and the other end is connected to the oil replenishment hole of the hydrostatic unit 4. Sealing rings are installed at the joints between the outer wall of the connecting sleeve 5 and the second step hole 17, as well as at the joints between the connecting sleeve 5 and the oil replenishment hole of the hydrostatic unit 4, to prevent hydraulic oil from leaking out.

[0046] Because the transmission is equipped with the shock absorber sleeve fixing structure of this invention, the disassembly difficulty of the shock absorber sleeve is reduced, damage and deformation of the shock absorber sleeve are avoided, and disassembly and assembly time is saved during maintenance, reducing the labor intensity of workers. At the same time, the oil supply channel of the shock absorber sleeve fixing component 1 guides the lower temperature hydraulic oil in the transmission to the hydrostatic unit 4, reducing the temperature of the hydraulic oil inside the hydrostatic unit 4, reducing wear on parts, and extending the service life of the transmission.

[0047] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A shock-absorbing sleeve fixing component, used for installation in a positioning hole in the housing of a continuously variable transmission (CVT) for hydraulic machinery, characterized in that, The first end of the fixing member has a first stepped post, and the first stepped post is provided with an external thread that mates with the positioning hole; the first stepped post has a first stepped hole for installing the shock absorber sleeve, the first stepped hole is coaxial with the first stepped post, and the first stepped hole has an internal groove near the opening end; the fixing member is provided with an oil replenishment channel, the oil replenishment channel includes an oil replenishment cavity, a through hole and a third stepped hole, the oil replenishment cavity is an annular groove located on one side of the first stepped post, the third stepped hole is coaxial with the second stepped hole and located on the side of the second stepped hole away from the first stepped hole, and the through hole connects the oil replenishment cavity and the third stepped hole; The fastener is provided with a second stepped hole, which is coaxial with the first stepped hole and located on the side of the first stepped hole away from the inner slot.

2. The shock-absorbing sleeve fixing component as described in claim 1, characterized in that, One end of the oil replenishment channel is connected to the positioning hole of the gearbox housing, and the other end is connected to the second step hole.

3. The shock-absorbing sleeve fixing component as described in claim 1, characterized in that, A guide angle is provided at one end of the opening of the first stepped hole.

4. The shock-absorbing sleeve fixing component as described in claim 1, characterized in that, The fastener has a second stepped post for positioning, the second stepped post being coaxial with the first stepped post, and the diameter of the second stepped post being larger than the diameter of the first stepped post.

5. The shock-absorbing sleeve fixing component as described in claim 1, characterized in that, The fastener has a rotating part that drives the fastener to rotate, and the rotating part is located at the second end of the fastener away from the first stepped post.

6. The shock-absorbing sleeve fixing component as described in claim 5, characterized in that, The rotating part is a hexagonal prism.

7. A gearbox, characterized in that, The gearbox housing is equipped with a shock-absorbing sleeve fastener as described in any one of claims 1-6.

8. The gearbox as described in claim 7, characterized in that, The gearbox housing contains a hydrostatic unit, which has an oil replenishment seat. The fixing member has a second stepped hole coaxial with the first stepped hole. After the fixing member is installed into the positioning hole, the second stepped hole and the oil replenishment hole of the oil replenishment seat are connected by a connecting sleeve.

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