A semi-sealed lubrication structure for the front-stage reduction gearbox of a drive axle in engineering machinery.

Abstract

This utility model belongs to the field of lubrication and sealing of drive axles in engineering machinery, and in particular, a semi-sealed lubrication structure for the front-stage reduction gearbox of an engineering machinery drive axle. It includes a connecting housing for the front-stage reduction gearbox, the exterior of which is connected to the main reducer via a bearing housing. Inside the connecting housing and the main reducer, a spiral bevel gear pair is installed for power transmission. A bearing is located between the spiral bevel gear pair and the bearing housing, and an internal gear ring is fitted onto the spiral bevel gear pair. An oil retainer ring is provided within the oil reservoir, comprising an annular portion and a cylindrical portion. The annular portion covers the lubricating oil hole, and the cylindrical portion abuts against the gear ring portion of the internal gear ring. This utility model adopts a semi-closed cavity structure, where the axle oil and the primary transmission oil are not completely isolated, achieving a certain heat dissipation effect. Simultaneously, it retains a semi-isolated oil cavity, preserving the fluidity of the lubricating oil. The structure is simple and the cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of lubrication and sealing of drive axles for engineering machinery, and in particular, it is a semi-sealed lubrication structure for the front reduction gearbox of drive axles for engineering machinery. Background Technology

[0002] In construction machinery, the drive axle needs to pass the power output from the gearbox through a reduction gear to reduce speed and increase torque, transmitting power to the wheels to enable vehicle operation and movement. Generally, the reduction is divided into two stages. The first stage, also known as the main reducer, uses a pair of spiral bevel gears to reduce speed while converting torque from the central longitudinal direction to the wheel-side lateral direction. The second stage is a wheel-side planetary reduction gear, which further reduces speed and increases torque.

[0003] When the host machine requires a large reduction ratio, a two-stage reduction system would lead to difficulties in reduction ratio distribution and an excessively large reduction structure. Currently, it is common practice to add a first-stage reduction gearbox (a pre-reduction gearbox) before the main reducer. To save space, the gearbox and drive axle are often integrated into one unit. The drive axle of a road roller is a typical example of a three-stage reduction (integrated gearbox and axle) transmission.

[0004] Typically, drive axle lubrication is achieved through gear splashing, with lubricating oil filling the axle housing of the main reduction gear and the cavities of the wheel-side reduction gears, effectively lubricating the gears and bearings within these components. However, because a three-stage reduction drive axle adds a front-stage reduction gear, which is located further from the axle housing and relatively close to the axle center, lubricating oil is difficult to store. Especially for road rollers, when operating on mountain roads with prolonged upward inclines, the lubricating oil in the front-stage reduction gear can flow back into the main reduction gear, leaving it unlubricated and causing dry friction damage to the gears and bearings.

[0005] There are currently two ways to solve this problem:

[0006] 1. A lubricating oil pipe extends from the main reduction gear housing and connects to the lubrication system of the preceding reduction gear. Lubricating oil is guided to the preceding reduction gear via splashing from the main reduction gear. This method is limited by the direction of the bevel gear's rotation; when the bevel gear rotates forward, some lubricating oil is available, but when the bevel gear rotates in the reverse direction, lubricating oil cannot reach the oil collection chamber.

[0007] 2. The front-stage reduction oil chamber and the axle package oil chamber are separated. The disadvantage of this method is that heat dissipation of the front-stage transmission is difficult. Utility Model Content

[0008] The purpose of this invention is to solve the problems existing in the prior art by proposing a semi-sealed lubrication structure for the front-stage reduction gearbox of the drive axle of engineering machinery.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This utility model discloses a semi-sealed lubrication structure for the front-stage reduction gearbox of a drive axle in engineering machinery. It includes a connecting housing for the front-stage reduction gearbox, the outer surface of which is connected to the main reducer via a bearing housing. The connecting housing, bearing housing, and main reducer housing are fixed together by several bolts. A spiral bevel gear pair is installed inside the connecting housing and the main reducer housing to transmit power. A bearing is located between the spiral bevel gear pair and the bearing housing. An internal gear ring fitted inside the connecting housing is also present for the spiral bevel gear pair.

[0011] The internal gear ring includes a bushing portion connected to the spiral bevel gear pair and a gear ring portion located on the bushing portion. The bushing portion abuts against the bearing. An oil storage space is formed between the gear ring portion, the bushing portion, the bearing, and the connecting housing located at the bearing seat position.

[0012] There are two lubricating oil channels between the pre-reduction gearbox and the main reduction gearbox: one is the gap between the bearing and the spiral bevel gear pair, and the other is the lubricating oil hole that runs through the housing of the connecting seat, the bearing seat, and the housing of the main reduction gearbox.

[0013] An oil baffle ring is provided in the oil storage space. The oil baffle ring surrounds the bushing portion. The oil baffle ring includes an annular portion and a cylindrical portion. The cylindrical portion is located inside the annular portion and is perpendicular to the annular portion.

[0014] The annular portion covers the lubricating oil hole.

[0015] As a further preferred embodiment, there is a gap between the cylindrical part and the gear ring part.

[0016] As a further preferred option, the gap between the cylindrical part and the gear ring part is 0.5mm.

[0017] As a further preferred embodiment, bolt holes corresponding to the annular portion are provided on the annular portion.

[0018] As a further preferred option, the cylindrical portion is flush with the inner ring of the bearing hole mounted on the connecting seat housing.

[0019] As a further preferred embodiment, the outer diameter of the annular portion is 210 mm, and the inner diameter is 135 mm.

[0020] As a further preferred embodiment, a connecting rib is provided between the annular portion and the cylindrical portion.

[0021] This invention adopts a semi-enclosed cavity structure, in which the bridge oil and the primary transmission oil are not completely isolated, which can achieve a certain heat dissipation effect. At the same time, the semi-isolated oil cavity is retained to maintain the fluidity of the lubricating oil and solve the problem of heat dissipation difficulties in the closed oil cavity. Attached Figure Description

[0022] Figure 1This is a schematic diagram showing the connection structure between the pre-reduction gearbox and the main reduction gearbox.

[0023] Figure 2 This is a schematic diagram of the internal structure of the pre-stage reduction gearbox proposed in this utility model;

[0024] Figure 3 This is a diagram showing the location of the lubricating oil holes inside the pre-reduction gearbox;

[0025] Figure 4 This is a schematic diagram of the oil baffle ring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] The present invention provides a semi-sealed lubrication structure for the front-stage reduction gearbox of a drive axle in engineering machinery. This is an improvement on the existing front-stage reduction gearbox. The existing front-stage reduction gearbox has a connecting seat housing 2, and the outside of the connecting seat housing 2 is connected to the main reducer 3 through a bearing seat 6. The connecting seat housing 2, the bearing seat 6, and the housing of the main reducer 3 are fixed together by several bolts.

[0028] The connecting seat housing 2 and the main reducer housing 3 are equipped with a spiral bevel gear pair 4 for power transmission. The spiral bevel gear pair 4 and the bearing housing 6 are connected by a bearing 7. The connecting seat housing 2 has a mounting hole on the side facing the main reducer housing 3. The bearing 7 is located at the mounting hole. The connecting seat housing 2 has an internal gear ring 5 that fits into the spiral bevel gear pair 4.

[0029] The internal gear ring 5 includes a bushing portion 51 connected to the spiral bevel gear pair 4 and a gear ring portion 52 located on the bushing portion 51. The bushing portion 51 abuts against the bearing 7. An oil storage space (annular) is formed between the gear ring portion 52, the bushing portion 51, the bearing 7, and the connecting seat housing 2 located at the bearing seat 6.

[0030] There are two lubricating oil channels between the front reduction gear and the main reduction gear: the gap between the bearing 7 and the spiral bevel gear pair 4, and the lubricating oil hole A that runs through the housings of the connecting seat 2, the bearing seat 6, and the main reduction gear 3. The gap is always present, and the flow of lubricating oil in this channel is relatively small. The lubricating oil hole is also present in existing front reduction gears. When driving on flat roads, the lubricating oil hole provides the main path for the flow of lubricating oil between the front reduction gear and the main reduction gear. However, when driving on slopes for a long time, the drawback of the lubricating oil hole will occur. The oil in the oil storage space will flow directly to the main reduction gear 3 through the lubricating oil hole, resulting in a lack of lubricating oil in the front reduction gear.

[0031] To address this problem, the improvement of this utility model is as follows: an oil retaining ring 1 is provided in the oil storage space, the oil retaining ring 1 is wrapped around the bushing portion 51, the oil retaining ring 1 includes an annular portion 11 and a cylindrical portion 12, the cylindrical portion 12 is located inside the annular portion 11 and is perpendicular to the annular portion 11; the annular portion 11 covers the lubricating oil hole; there is a gap between the cylindrical portion 12 and the gear ring portion 52, so that a new oil storage space (annular) is formed between the gear ring portion 52, the oil retaining ring 1, and the connecting seat housing 2, and the volume is smaller than the oil storage space volume of the prior art.

[0032] When the annular portion 11 covers the lubricating oil hole, it can directly block this main lubricating oil flow channel. The front reduction gear forms a relatively independent space in the oil chamber, but it is a semi-closed state. Compared with the prior art, which uses the isolation between the front reduction oil chamber and the bridge oil chamber, which leads to difficulties in heat dissipation of the front transmission, this utility model also leaves a gap between the cylindrical portion 12 and the gear ring portion 52. Lubricating oil can still flow between the front reduction gear and the main reduction gear through this gap, avoiding heat dissipation problems. Because the flow gap formed by this gap is small, under the condition of inclined road surface, the lubricating oil in the new oil storage space slowly flows into the main reduction gear through this gap, reducing the time of lubricating oil loss in the front reduction gear when on the slope, ensuring the lubricating oil storage in the front reduction gear, and avoiding the gear and bearing dry friction damage due to lack of lubrication in the front reduction gear.

[0033] The annular part 11 of this utility model can be installed according to different usage scenarios of engineering machinery. When it is no longer necessary to work on sloping roads for a long time, it can be disassembled and the original lubrication oil channel can continue to be used.

[0034] Furthermore, the gap between the cylindrical part 12 and the gear ring part 52 is 0.5mm. With this size, the lubricating oil exchanges between the oil storage space and the external space at a low flow rate, which to some extent solves the heat dissipation problem of the front reduction gear. Moreover, on sloping roads, it greatly delays the loss of lubricating oil, so that a semi-closed environment is formed inside the front reduction gear, ensuring the reserve of lubricating oil.

[0035] Furthermore, bolt holes corresponding to the annular portion 11 are provided on the annular portion 11, and the oil baffle ring 1 is fixed by bolts.

[0036] Furthermore, the cylindrical part 12 is flush with the inner ring of the opening for mounting the bearing 7 in the connecting seat housing 2. As can be seen from the attached drawings, this design can ensure that there is a small oil storage space between the cylindrical part 12 and the bushing part 51, which is conducive to the exchange of oil between the new oil storage space and the outside.

[0037] Furthermore, the outer diameter of the annular portion 11 is 210 mm, and the inner diameter is 135 mm.

[0038] Furthermore, there is a connecting rib between the annular portion 11 and the cylindrical portion 12. When the annular portion 11 is fixed, the fixed state can be transferred to the cylindrical portion 12 through the connecting rib, which improves the stability of the cylindrical portion 12, ensures the stability of the gap between it and the gear ring portion 52, which is beneficial to the stability of the oil loss rate and helps to estimate the oil loss time.

[0039] Lubricating oil is added to the lower 1 / 4 of the front reduction bearing. The front reduction bearing and gear pair are lubricated by immersion and splash lubrication during gear transmission.

[0040] During normal road driving, lubricating oil enters the front reduction gearbox through the gap between the oil baffle ring and the gear ring, ensuring sufficient lubrication of the reduction gearbox and bearings. When the vehicle is tilted, because the oil baffle ring does not have an added oil passage hole, lubricating oil cannot flow into the axle housing from the lubricating oil holes of the connecting seat and the main reduction housing. The oil baffle ring can prevent the lubricating oil from the original front reduction gear from flowing into the axle housing, and forms an oil chamber at the bottom of the front reduction gearbox with the connecting seat. The front gear ring end face is provided with a lubricating oil hole, through which lubricating oil can flow back, ensuring sufficient lubrication of the front reduction gears and bearings.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A semi-sealed lubrication structure for a front-stage reduction gearbox of an engineering machinery drive axle, comprising a connecting seat housing (2) of the front-stage reduction gearbox, the outside of the connecting seat housing (2) being connected to the main reducer housing (3) via a bearing seat (6), the connecting seat housing (2), the bearing seat (6), and the housing of the main reducer housing (3) being fixed together by a number of bolts; a spiral bevel gear pair (4) is provided inside the connecting seat housing (2) and the main reducer housing (3) to transmit power, a bearing (7) is provided between the spiral bevel gear pair (4) and the bearing seat (6), and an internal gear ring (5) fitted inside the connecting seat housing (2) and fitted onto the spiral bevel gear pair (4); The inner gear ring (5) comprises a shaft sleeve part (51) connected with the spiral bevel gear pair (4) and a gear ring part (52) located on the shaft sleeve part (51), and the shaft sleeve part (51) is in abutment with the bearing (7), wherein, An oil storage space is formed between the gear ring portion (52), the bushing portion (51), the bearing (7), and the connecting seat housing (2) located at the bearing seat (6); There are two lubricating oil channels between the front reduction gear and the main reduction gear: the gap between the bearing (7) and the spiral bevel gear pair (4), and the lubricating oil hole that runs through the housing of the connecting seat (2), the bearing seat (6), and the main reduction gear (3). The oil storage space is characterized by having an oil baffle ring (1) inside, the oil baffle ring (1) being wrapped around the bushing (51), the oil baffle ring (1) including an annular part (11) and a cylindrical part (12), the cylindrical part (12) being located inside the annular part (11), and the cylindrical part (12) being perpendicular to the annular part (11). The annular portion (11) covers the lubricating oil hole.

2. The semi-sealed lubrication structure of the front-stage reduction gearbox of the drive axle of engineering machinery according to claim 1, characterized in that: There is a gap between the cylindrical part (12) and the gear part (52).

3. The semi-sealed lubrication structure of the front-stage reduction gearbox of the drive axle of engineering machinery according to claim 1, characterized in that: The gap between the cylindrical part (12) and the gear ring part (52) is 0.5 mm.

4. The semi-sealed lubrication structure of the front-stage reduction gearbox of the drive axle of engineering machinery according to claim 1, characterized in that: The annular portion (11) has bolt holes corresponding to the annular portion (11).

5. The semi-sealed lubrication structure of the front-stage reduction gearbox of the drive axle of engineering machinery according to claim 1, characterized in that: The cylindrical part (12) is flush with the inner ring of the opening of the bearing (7) in the connecting seat housing (2).

6. The semi-sealed lubrication structure of the front-stage reduction gearbox of the drive axle of engineering machinery according to claim 1, characterized in that: The outer diameter of the annular portion (11) is 210 mm, and the inner diameter is 135 mm.

7. The semi-sealed lubrication structure of the front-stage reduction gearbox of the drive axle of engineering machinery according to claim 1, characterized in that: There is a connecting rib between the annular part (11) and the cylindrical part (12).

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