A bus special gearbox separates lubricating mechanism

Abstract

This utility model specifically relates to a separation lubrication mechanism for a bus-specific gearbox. Its purpose is to solve the problems of insufficiently secure oil pipe connections in existing release bearing lubrication structures, which easily lead to leakage, and the oil pipes' embrittlement at high temperatures, affecting the normal operation of the gearbox. This utility model includes a clutch housing with a mounting hole, a bearing seat disposed within the clutch housing, a release bearing mounted on the bearing seat, and a separation oil pipe. The inner wall of the inner ring of the release bearing is machined with an annular oil passage, and a lubrication oil channel communicating with the annular oil passage is provided on the inner ring. One end of the separation oil pipe has a fixed connector, and the other end has a movable connector. One end of the pipe is threadedly connected to the lubrication oil channel via the fixed connector, and the other end is threadedly connected to the inner end of the mounting hole via the movable connector. A grease nipple is installed at the outer end of the mounting hole for connecting to a grease source to add grease into the pipe.

Description

Technical Field

[0001] This utility model relates to a bearing lubrication structure, specifically to a bus-specific gearbox separation lubrication mechanism. Background Technology

[0002] Currently, most buses are fuel-powered and equipped with manual transmissions (MT). In the current bus internal separation system, the oil pipes are typically connected to the bearings and clutch housing via a plug-in connection and sealing rings at both ends. However, in the high-frequency vibrations inside a bus, this connection method can easily cause the oil pipes to detach or leak, leading to grease leakage from the oil pipes, contaminating the internal environment of the clutch housing, and potentially affecting the normal operation of other components within the clutch housing.

[0003] In addition, due to the frequent starting and shifting of buses, the clutch friction plates generate a lot of heat, which is transferred to the separation system. This causes the separation system to work in a high-temperature environment for a long time, resulting in frequent embrittlement failure of the rubber separation oil pipes, which affects the normal operation of the gearbox.

[0004] Therefore, there is an urgent need to propose a separate lubrication mechanism suitable for fuel-powered buses.

[0005] Chinese patent CN114635961A discloses an integrated oil circuit structure, including housing oil passage A and housing oil passage B disposed inside the transmission housing, and an oil pipe connecting housing oil passage B and release bearing. One end of the oil pipe is sealed to the transmission housing through a plug-in connector and a sealing ring, and the other end is connected to the release bearing through a threaded connector. This solution combines the housing oil passage and the oil pipe to achieve integrated lubrication circuit. However, when this solution is applied to the interior of a bus, the plug-in end still has the potential risk of the seal loosening due to bumps inside the vehicle. In addition, this solution does not take into account the problem that the oil pipe is prone to embrittlement due to high temperature when the integrated oil circuit structure is working in a high-temperature environment. Utility Model Content

[0006] The main purpose of this utility model is to solve the technical problems of insufficiently stable oil pipe connection in the existing release bearing lubrication structure, which easily leads to leakage, and the oil pipe is prone to embrittlement failure under high temperature environment, affecting the normal operation of the gearbox. Therefore, this utility model provides a release lubrication mechanism for a bus gearbox.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A separation and lubrication mechanism for a bus gearbox includes a clutch housing, a bearing housing disposed in the inner cavity of the clutch housing, a release bearing mounted on the bearing housing, and a release oil pipe.

[0009] The release bearing includes an inner ring whose inner wall mates with the bearing housing; the inner wall of the inner ring is machined with an annular oil passage along the circumferential direction.

[0010] The bearing inner ring is provided with a lubricating oil passage for connecting the annular oil passage to the separation oil pipe;

[0011] Its special feature is:

[0012] The separating oil pipe includes a pipe body, a fixed joint at one end of the pipe body, and a movable joint at the other end of the pipe body; one end of the pipe body is threadedly connected to the lubricating oil passage through the fixed joint.

[0013] The movable joint includes a transition joint fixedly connected to the other end of the pipe body, and a rotary joint disposed on the transition joint and rotatable on the transition joint.

[0014] The clutch housing has a mounting hole, and the other end of the tube is threadedly connected to the inner end of the mounting hole via a rotary joint.

[0015] The mounting hole is threaded to a grease nipple, which is used to connect to a grease source and add grease into the tube.

[0016] Furthermore, both the fixed joint and the transition joint are configured with clamps at the ends near the pipe body, and both ends of the pipe body are inserted into the clamps; the inner wall of the clamp and the inner wall of both ends of the pipe body are toothed structures for further fixing the pipe body; the middle outer side of both the fixed joint and the transition joint are provided with clamping bosses for rotating clamping of the installation tools.

[0017] The rotary joint is located on the end of the transition joint away from the pipe body. The rotary joint is divided into a stamping section, an installation section and a threaded section from the inside to the outside. The inner wall of the stamping section is provided with an annular positioning groove, and the corresponding position of the outer wall of the transition joint is provided with an annular positioning boss. The rotary joint is fitted onto the transition joint. The stamping section of the rotary joint is stamped on the outer wall by the stamping equipment, so that the annular positioning groove and the annular positioning boss cooperate to realize the positioning of the rotary joint on the transition joint.

[0018] The rotary joint is threadedly connected to the inner end of the mounting hole via a threaded section.

[0019] Furthermore, the outer wall of the transition joint away from the pipe body has two sealing grooves along the circumference, in which O-rings are provided, and the transition joint and the rotary joint are sealed and connected by the O-rings.

[0020] Furthermore, the tube body is made of hydrogenated nitrile rubber to improve the upper limit of high temperature resistance.

[0021] Furthermore, the outer wall of the tube is provided with a metal woven mesh protective layer to improve wear resistance.

[0022] Furthermore, the threads machined on the outer walls of the fixed joint and the rotary joint, as well as the threads on the outer end of the grease fitting installed in the mounting hole, are all tapered threads to further improve the installation sealing performance.

[0023] Furthermore, let L1 be the distance between the center of the outer end of the lubricating oil passage and the center of the inner end of the mounting hole, and L be the distance between the outer end face of the rotary joint mounting section and the outer end face of the clamping boss of the fixed joint. Then, L1 and L satisfy the following relationship: L = L1 + 30mm; thereby preventing the tube from malfunctioning due to being too short and tight, or from hindering the operation of other components in the inner cavity of the clutch housing due to being too long.

[0024] Furthermore, the opening end of the clamp is configured as a flared structure, and the diameter of the flared end is larger than the outer diameter of the pipe body, which facilitates inserting both ends of the pipe body into the clamp.

[0025] Furthermore, the sidewall of the clamp is provided with multiple axially extending anti-slip grooves to increase the friction of the sidewall of the clamp during installation.

[0026] Furthermore, both the clamping boss and the mounting section are hexagonal structures.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. This utility model provides a bus-specific gearbox separation and lubrication mechanism, wherein both ends of the separation oil pipe are threaded. With one end of the separation oil pipe already threaded to the separation bearing, the other end is threaded to the clutch housing using a rotary joint that can rotate on the transition joint. This ensures the sealing of both ends of the oil pipe and prevents the pipe from twisting during installation, thus reducing the failure rate of the separation oil pipe.

[0029] 2. The present invention provides a bus-specific gearbox separation and lubrication mechanism, wherein the separation oil pipe is made of hydrogenated nitrile rubber. Compared with the nitrile rubber pipe commonly used in the industry, while retaining the original pipe's oil resistance and -40℃ low temperature limit, the high temperature resistance limit is increased from 120℃ to 150℃, thereby enabling it to adapt to the high temperature working environment of the clutch housing cavity of fuel-powered buses.

[0030] 3. The present invention provides a bus-specific gearbox separation and lubrication mechanism, wherein the outer layer of the separation oil pipe is provided with a metal braided mesh protective layer, which can improve the wear resistance and tensile strength of the separation oil pipe, prevent the separation oil pipe from being damaged or broken by friction with the clutch housing cavity or other accessories, and improve the service life of the separation oil pipe. Attached Figure Description

[0031] Figure 1This is a schematic diagram of an embodiment of the bus-specific gearbox separation and lubrication mechanism of this utility model;

[0032] Figure 2 This is a cross-sectional view of the bearing housing, the separation bearing, and the separation oil pipe in an embodiment of a bus-specific gearbox separation and lubrication mechanism of the present invention.

[0033] Figure 3 This is a partial half-section diagram of the separation oil pipe in an embodiment of the separation lubrication mechanism for a bus gearbox according to the present invention;

[0034] Figure 4 for Figure 1 A magnified schematic diagram of the structure of a portion of region A in the middle;

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Bearing housing; 2-Separation bearing; 21-Bearing inner ring; 22-Lubricating oil passage; 3-Separation oil pipe; 31-Fixed joint; 32-Pipe body; 33-Modible joint; 331-Transition joint; 332-Rotary joint; 333-O-ring seal; 4-Grease nozzle; 5-Clutch housing; 51-Mounting hole. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] A dedicated gearbox separation and lubrication mechanism for buses, its overall structure is as follows: Figure 1 As shown, it includes a clutch housing 5, a bearing seat 1 disposed in the inner cavity of the clutch housing 5, a release bearing 2 mounted on the bearing seat 1, and a release oil pipe 3;

[0039] like Figure 2 As shown, the release bearing 2 includes an inner bearing ring 21 whose inner wall mates with the bearing housing 1; the inner wall of the inner bearing ring 21 is machined with an annular oil passage; the inner bearing ring 21 is provided with a lubricating oil passage 22 for connecting the annular oil passage to the release oil pipe 3.

[0040] like Figure 3As shown, the separating oil pipe 3 includes a pipe body 32, a fixed connector 31 disposed at one end of the pipe body 32, and a movable connector 33 disposed at the other end of the pipe body 32; one end of the pipe body 32 is installed in the lubricating oil passage 22 through a tapered thread provided on the outer wall of the fixed connector 31; specifically, the movable connector 33 includes a transition connector 331 fixedly connected to the other end of the pipe body 32, and a rotary connector 332 disposed on the transition connector 331 and rotatable on the transition connector 331; both the fixed connector 31 and the transition connector 331 are located at the ends near the pipe body 32. The clamp is used, and both ends of the pipe body 32 are inserted into the clamp. The opening end of the clamp is set as a flared structure, and the diameter of the flared end is larger than the outer diameter of the pipe body 32, which makes it easy to insert both ends of the pipe body 32 into the clamp. The side wall of the clamp is provided with multiple axially extending anti-slip grooves, which can improve the friction during installation. The part of the inner wall of the clamp that contacts the inner wall of both ends of the pipe body 32 is a toothed structure, which is used to further fix the pipe body 32. The middle outer side of the fixed joint 31 and the transition joint 331 are provided with a hexagonal clamping boss for rotating clamping of the installation tool.

[0041] The rotary joint 332 is located at the end of the transition joint 331 away from the pipe body 32. It is divided into a stamping section, an installation section and a threaded section from the inside to the outside. The inner wall of the stamping section is provided with an annular positioning groove. The corresponding position of the outer wall of the transition joint 331 is provided with an annular positioning boss. The rotary joint 332 is fitted onto the transition joint 331. The stamping section of the rotary joint 332 is stamped on the outer wall by the stamping equipment, so that the annular positioning groove and the positioning boss cooperate to realize the positioning of the rotary joint 332 on the transition joint 331.

[0042] The tube body 32 is made of hydrogenated nitrile rubber, which has good oil resistance and can work in an environment of -40℃ to 150℃. Its outer wall is provided with a metal braided mesh protective layer, which effectively improves the wear resistance of the tube body 32.

[0043] The outer wall of the transition joint 331 away from the pipe body 32 has two sealing grooves along the circumference, in which O-rings 333 are provided. The transition joint 331 and the rotary joint 332 are sealed and connected by the O-rings 333.

[0044] In addition, let L1 be the distance between the outer end center of the lubricating oil passage 22 and the inner end center of the mounting 51, and L be the distance between the outer end face of the mounting section of the rotary joint 332 and the outer end face of the clamping boss of the fixed joint 31. Then L1 and L satisfy the following relationship: L = L1 + 30mm, thereby preventing the tube from malfunctioning due to being too short or hindering the operation of other components in the inner cavity of the clutch housing due to being too long.

[0045] like Figure 4As shown, a mounting hole 51 is provided on the clutch housing 5, and the other end of the tube 32 is installed on the inner end of the mounting hole 51 through a tapered thread machined on the outer wall of the threaded section of the rotary joint 332.

[0046] The outer end of the mounting hole 51 is threaded with a grease nipple 4, which is used to connect to a grease source and add lithium-based grease into the tube body 32.

[0047] During the assembly process, firstly, the bearing housing 1 is assembled into the inner cavity of the clutch housing 5, and the release bearing 2 is installed on the bearing housing 1, so that the inner wall of the bearing inner ring 21 fits against the bearing housing 1; secondly, the release oil pipe 3 is installed, and the fixed joint 31, which is fixedly connected to one end of the pipe body 32, is installed on the outer end of the lubricating oil passage 22 through a tapered thread, and the other end of the pipe body 32 is threaded to the inner end of the mounting hole 51 through a rotating joint 332, which is sleeved on the transition joint 331 and can rotate relative to the transition joint 331; finally, the grease nipple 4 is threaded to the outer end of the mounting hole 51, so that one end of the grease nipple 4 extends to the outside of the clutch housing 5, thus completing the assembly of this embodiment.

[0048] When lubrication is required, lithium-based grease is injected into the grease nipple 4. The lithium-based grease enters the lubrication passage 22 through the separator oil pipe 3 and further flows into the annular oil passage machined on the inner wall of the bearing inner ring 21, thereby providing lubrication for the axial sliding of the release bearing 2.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. For those skilled in the art, modifications can be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by this utility model.

Claims

1. A separation lubrication mechanism for a bus gearbox, comprising a clutch housing (5), a bearing seat (1) disposed in the inner cavity of the clutch housing (5), a separation bearing (2) mounted on the bearing seat (1), and a separation oil pipe (3); The release bearing (2) includes an inner ring (21) whose inner wall mates with the bearing housing (1); the inner wall of the inner ring (21) is machined with an annular oil passage along the circumferential direction; The bearing inner ring (21) is provided with a lubricating oil passage (22) for connecting the annular oil passage to the separation oil pipe (3); Its features are: The separating oil pipe (3) includes a pipe body (32), a fixed joint (31) provided at one end of the pipe body (32), and a movable joint (33) provided at the other end of the pipe body (32); one end of the pipe body (32) is threadedly connected to the lubricating oil passage (22) through the fixed joint (31); The movable joint (33) includes a transition joint (331) fixedly connected to the other end of the pipe body (32), and a rotary joint (332) disposed on the transition joint (331) and rotatable on the transition joint (331); The clutch housing (5) has a mounting hole (51), and the other end of the tube (32) is threaded to the inner end of the mounting hole (51) through a rotary joint (332); The mounting hole (51) is threaded with a grease nipple (4) at its outer end. The grease nipple (4) is used to connect to a grease source and add grease into the tube body (32).

2. The bus-specific gearbox separation and lubrication mechanism according to claim 1, characterized in that: The fixed joint (31) and the transition joint (331) are both configured with clamps at the ends near the pipe body (32), and both ends of the pipe body (32) are inserted into the clamps; the inner wall of the clamps and the inner walls of both ends of the pipe body (32) are toothed structures for further fixing the pipe body (32); the fixed joint (31) and the transition joint (331) are both provided with clamping bosses on the outer side of the middle part for rotating clamping of the installation tool; The rotary joint (332) is located on the end of the transition joint (331) away from the pipe body (32). The rotary joint (332) is divided into a stamping section, an installation section and a threaded section from the inside to the outside. The inner wall of the stamping section is provided with an annular positioning groove. The corresponding position of the outer wall of the transition joint (331) is provided with an annular positioning boss. The rotary joint (332) is fitted on the transition joint (331). The stamping section of the rotary joint (332) is stamped on the outer wall by the stamping equipment, so that the annular positioning groove and the annular positioning boss cooperate to realize the positioning of the rotary joint (332) on the transition joint (331). The rotary joint (332) is threadedly connected to the inner end of the mounting hole (51) via a threaded section.

3. The bus-specific gearbox separation and lubrication mechanism according to claim 2, characterized in that: The transition joint (331) has two sealing grooves along the circumferential direction on the outer wall of the end away from the pipe body (32), in which an O-ring (333) is provided. The transition joint (331) and the rotary joint (332) are sealed and connected by the O-ring (333).

4. The bus-specific gearbox separation and lubrication mechanism according to claim 3, characterized in that: The tube body (32) is made of hydrogenated nitrile rubber to improve the upper limit of high temperature resistance.

5. The bus-specific gearbox separation and lubrication mechanism according to claim 4, characterized in that: The outer wall of the tube (32) is provided with a metal woven mesh protective layer to improve wear resistance.

6. A bus-specific gearbox separation and lubrication mechanism according to any one of claims 1-5, characterized in that: The threads machined on the outer walls of the fixed joint (31) and the rotary joint (332), as well as the threads of the grease fitting (4) installed on the outer end of the mounting hole (51), are all tapered threads to further improve the installation sealing performance.

7. The bus-specific gearbox separation and lubrication mechanism according to claim 2, characterized in that: Let L1 be the distance between the outer end center of the lubricating oil passage (22) and the inner end center of the mounting hole (51), and L be the distance between the outer end face of the mounting section of the rotary joint (332) and the outer end face of the clamping boss of the fixed joint (31). Then L1 and L satisfy the following relationship: L = L1 + 30mm.

8. The bus-specific gearbox separation and lubrication mechanism according to claim 2, characterized in that: The opening end of the clamp is set as a flared structure, and the diameter of the flared end is larger than the outer diameter of the pipe body (32), so that the two ends of the pipe body (32) can be inserted into the clamp.

9. A bus-specific gearbox separation and lubrication mechanism according to claim 2, characterized in that: The clamp has multiple axially extending anti-slip grooves on its sidewalls to increase the friction of the clamp sidewalls during installation.

10. A bus-specific gearbox separation and lubrication mechanism according to claim 2, characterized in that: Both the clamping boss and the mounting section are hexagonal structures.

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