Bearing lubricating device and working machine comprising same

Abstract

The utility model relates to a bearing lubricating device and an operating machine comprising the same. The gearbox comprises a box body (1) and a gear shaft (3). The box body (1) is provided with a supporting part (11), the supporting part (11) is provided with a first through hole (12), and the first end of the gear shaft (3) is supported in the first through hole (12) through the first bearing (4). The bearing lubricating device comprises a bearing baffle (5) fixed to the first end of the gear shaft (3) and a first lubricating oil channel (61) formed in the gear shaft (3). A groove (51) is formed in the side, facing the gear shaft, of the bearing baffle (5) so that a second lubricating oil channel (62) communicated with the first lubricating oil channel (61) can be defined by the bearing baffle (5) and the first end of the gear shaft together. The bearing lubricating device can meet the lubricating requirement of the shaft end bearing of the gearbox, so that the internal noise of the gearbox can be reduced, and the service life of the bearing can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to operation machinery, especially is related to the bearing lubricating device for lubricating the bearing of gearbox axle end of operation machinery. BACKGROUND

[0002] Operation machinery such as wheel loader usually has gear type power shift gearbox to adapt to different requirements of driving wheel traction force and vehicle speed under starting, accelerating, running and various operation conditions. The gearbox usually can include a housing, a gear shaft supported in the housing via a bearing and a gear connected to the gear shaft in transmission. Lubricating oil can be arranged at the bottom of the inner cavity of the housing and can immerse part of the gear, and the gear can splash the lubricating oil on the bearing to lubricate the bearing. However, only splash lubrication can not meet the lubrication requirements of the bearings located at both ends of the gear shaft. Insufficient lubrication can increase the noise inside the gearbox and reduce the service life of the bearing. SUMMARY

[0003] The utility model discloses at least one of the above-mentioned problems and / or other problems existing in the prior art is solved.

[0004] To achieve the above-mentioned purpose, according to one aspect of the utility model provides a kind of bearing lubricating device for lubricating the axle end bearing of gearbox, the gearbox includes box and gear shaft, the box is provided with supporting portion, the supporting portion has first through-hole, the first end of the gear shaft is supported in the first through-hole via first bearing. The bearing baffle fixed to the first end of the gear shaft and the first lubricating oil channel formed in the gear shaft. The bearing baffle is provided with recess on its side towards the gear shaft, to define second lubricating oil channel with the first lubricating oil channel in common with the first end of the gear shaft.

[0005] According to an embodiment of the utility model, the recess includes central part communicated with the first lubricating oil channel and radial extension part passing through the central part to the outer periphery of the bearing baffle.

[0006] According to an embodiment of the utility model, the recess includes two radial extension parts, which are arranged opposite to each other along the diameter direction of the bearing baffle.

[0007] According to an embodiment of the utility model, the radial extension part and the central part have the same recess depth.

[0008] According to an embodiment of the utility model, the recess depth of the radial extension part gradually decreases in the outward radial direction of the bearing baffle.

[0009] According to an embodiment of the present application, the bearing baffle is further provided with a mounting hole penetrating through the bearing baffle along the axial direction, so that the bearing baffle is fixed to the gear shaft by a bolt penetrating through the mounting hole.

[0010] According to an embodiment of the present application, the mounting hole and the radial extension are arranged in a staggered manner in the circumferential direction of the bearing baffle.

[0011] According to an embodiment of the present application, an open cavity is formed between the outer circumferential surface of the bearing baffle and the inner circumferential surface of the supporting portion.

[0012] According to an embodiment of the present application, the gearbox further comprises a cover connected to the open end of the box body, the cover is provided with a second through hole opposite to the first through hole, and a second end of the gear shaft opposite to the first end is supported in the second through hole via a second bearing. The gearbox further comprises a bearing end cover connected to a side of the cover away from the supporting portion and abutting against an outer ring of the second bearing, so as to form a closed cavity for lubricating the second bearing. The bearing lubricating device further comprises a third lubricating oil channel formed in the interior of the gear shaft, and the third lubricating oil channel is in communication with the first lubricating oil channel and the closed cavity.

[0013] According to another aspect of the present application, a working machine is provided, which comprises a gearbox and a bearing lubricating device as described above.

[0014] According to the bearing lubricating device of the present application, a bearing baffle is fixed to one end of the gear shaft, and a groove is arranged on the side of the bearing baffle facing the gear shaft, so that the bearing baffle and the end surface of the gear shaft jointly define a second lubricating oil channel in communication with a first lubricating oil channel formed in the interior of the gear shaft. With the rotation of the gear shaft, lubricating oil can be thrown out and splashed onto the corresponding shaft end bearing via the first lubricating oil channel and the second lubricating oil channel, so as to ensure that the bearing can be fully lubricated. Therefore, the internal noise of the gearbox can be reduced and the service life of the bearing can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0015] The features and advantages of the present application will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings provided only by way of illustration, wherein:

[0016] Figure 1 A schematic view of a bearing lubricating device according to an embodiment of the present application is shown.

[0017] Figure 2 A schematic view of a gearbox according to an embodiment of the present application is shown. Figure 1 A perspective view of a bearing baffle of the bearing lubricating device shown.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Housing; 11. Support; 12. First through hole; 2. Cover; 21. Second through hole; 3. Gear shaft; 4. First bearing; 5. Bearing baffle; 51. Groove; 511. Central part; 512. Radial extension; 52. Mounting hole; 61. First lubricating oil passage; 62. Second lubricating oil passage; 63. Third lubricating oil passage; 7. Second bearing; 8. Bearing end cover; 9. Enclosed cavity. Detailed Implementation

[0020] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that implementations of the present invention may not include some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention can be conceived to be implemented with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0021] The terms "first" and "second" are used below to describe the elements of this application. These terms are used only to distinguish the individual elements and not to limit the nature, order, or number of these elements. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that there may be additional elements / components besides those listed.

[0022] Figure 1 A schematic diagram of a bearing lubrication device according to an embodiment of the present invention is shown. This bearing lubrication device is used to lubricate the shaft-end bearings of a gearbox in working machinery such as a wheel loader. The gearbox may include a housing 1, a cover 2, and a plurality of gear shafts 3, each gear shaft 3 possibly having a plurality of gears. Figure 1 The image shows only one gear shaft 3 and two gears connected to that gear shaft 3, namely the left gear and the right gear.

[0023] In this embodiment, as Figure 1 As shown, the box body 1 defines an internal cavity with an opening at the right end, and the cover 2 defines an internal cavity with an opening at the left end. The open ends of the box body 1 and the cover 2 abut against each other and are fixed together by fasteners such as bolts, so that the box body 1 and the cover 2 together define a closed cavity. However, the present invention is not limited to this. For example, it is also possible that only the box body 1 defines a cavity with an opening at one end, and the plate-like cover 2 is joined to the open end of the box body 1 to close the cavity.

[0024] Continue to refer to Figure 1 As shown, the housing 1 may include a bottom wall (not shown) located on the left side of the figure and a cylindrical side wall extending to the right side from the bottom wall. The housing 1 may also include a support portion 11 extending from the central portion of the side wall into the inner cavity of the housing, the support portion 11 having a first through hole 12. The left end of the gear shaft 3 is supported in the first through hole 12 via a first bearing 4. The cover 2 is fixed to the side wall of the housing 1 by fasteners and has a second through hole 21 opposite to the first through hole 12. The right end of the gear shaft 3 is supported in the second through hole 21 via a second bearing 7.

[0025] To lubricate the first bearing 4 and the second bearing 7, the gear shaft 3 is provided with a first lubricating oil passage 61, which in particular runs along its central axis. The first lubricating oil passage 61 is connected to a lubricating oil supply unit (e.g., an oil reservoir, not shown) on one hand, and supplies lubricating oil to the first bearing 4 and the second bearing 7 via the second lubricating oil passage 62 and the third lubricating oil passage 63, respectively.

[0026] More specifically, such as Figure 1 As shown, a shoulder is formed at the left end of the gear shaft 3, and a stop is provided at the first through hole 12 in the support portion 11. The first bearing 4 is positioned axially between the stop and the shoulder of the gear shaft 3, and is fitted onto the gear shaft 3 with an interference fit on the outer side of the left gear. To form the second lubrication channel 62, a bearing baffle 5 is fixed at the left end of the gear shaft 3. Figure 2 As shown, the bearing baffle 5 is on one of its surfaces ( Figure 1 A groove 51 is provided on the right side surface of the gear shaft 3. When the bearing baffle 5 is fixed to the gear shaft 3, the groove 51 and the left end face of the gear shaft 3 together define the second lubrication oil passage 62. In this way, the first bearing 4 can be lubricated by the lubricating oil thrown out through the first lubrication oil passage 61 and the second lubrication oil passage 62 when the bearing baffle 5 rotates with the gear shaft 3.

[0027] In this embodiment, an open cavity is formed between the outer peripheral surface of the bearing baffle 5 and the inner peripheral surface of the first through hole 12 of the support portion 11. Other gear shafts and gears (not shown) are also provided in the inner cavity portion of the housing 1 located on the left side of the support portion 11. The lubricating oil carried by the rotation of these gears can also splash onto the first bearing 4 through the open cavity to lubricate it.

[0028] Continue to refer to Figure 1As shown, the right end of the gear shaft 3 passes through the second through hole 21 of the cover 2 and extends out of the cavity. Unlike the left gear of the gear shaft 3, which is arranged axially side by side with the first bearing 4, the second bearing 7 is fitted onto the right gear at the right end of the gear shaft 3 with an interference fit, and the inner ring of the second bearing 7 abuts against the stop portion on the right gear. The bearing end cover 8 is connected to the right side of the cover 2 by fasteners such as bolts around the second through hole 21. The bearing end cover 8 has a protrusion that extends axially into the second through hole 21, and this protrusion abuts against the outer ring of the second bearing 7. Thus, the second bearing 7 can be fixed axially by the cooperation between the protrusion on the bearing end cover 8 and the stop portion on the right gear. To lubricate the second bearing 7, a closed cavity 9 for storing lubricating oil is formed between the right end of the gear shaft 3, the bearing end cover 8, and the second bearing 7. A third lubricating oil passage 63 arranged radially along the gear shaft 3 connects the first lubricating oil passage 61 and the closed cavity 9. In this way, the lubricating oil in the first lubrication channel 61 can enter the closed cavity 9 through the third lubrication channel 63 to lubricate the second bearing 7.

[0029] Figure 2 It shows Figure 1 A perspective view of bearing baffle 5 in the image. (See image for reference.) Figure 2 As shown, the bearing baffle 5 may include a first surface and a second surface. The first surface faces and engages with the left end face of the gear shaft 3. The second surface is opposite to the first surface and away from the gear shaft 3. A groove 51 is provided on the first surface and recessed towards the second surface.

[0030] More specifically, the groove 51 may include a central portion 511 and a radially extending portion 512. The central portion 511 is located at the center of the bearing baffle 5 and is generally circularly recessed, so that when the bearing baffle 5 is fixed together with the gear shaft 3, it can jointly define a liquid collecting section of the second lubricating oil passage 62 with the left end face of the gear shaft 3, which communicates with the first lubricating oil passage 61. The radially extending portion 512 extends radially from the central portion 511 to the outer periphery of the bearing baffle 5, so that when the bearing baffle 5 is fixed together with the gear shaft 3, it can at least jointly define a liquid throwing section of the second lubricating oil passage 62 with the left end face of the gear shaft 3.

[0031] To ensure the balance of the gear shaft 3 during rotation, multiple radial extensions 512 are typically provided at equal intervals. In this embodiment, the groove 51 includes two radial extensions 512, which are arranged opposite to each other along the diametrical direction of the bearing baffle 5. This straight groove portion is easy to process.

[0032] In the above embodiments, such as Figure 1As shown, the outer periphery of the bearing baffle 5 extends to cover the inner ring of the first bearing 4, so that the radial extension 512 of the groove 51 cooperates with the left end face of the gear shaft 3 and the inner ring of the first bearing 4 to define a flinging section of the second lubricating oil channel 62.

[0033] In the present embodiment, the radial extension 512 and the central portion 511 have the same recess depth, in other words, the overall depth of the second lubricating oil channel 62 remains unchanged. After the lubricating oil is flung out via the flinging section of the second lubricating oil channel 62, part of the lubricating oil can directly splash between the inner and outer rings of the first bearing 4 for lubrication, and the other part can first splash to the inner peripheral wall of the first through hole 12 and then be bounced to the inner and outer rings of the first bearing 4 for lubrication.

[0034] In other embodiments, the depth of the radial extension 512 can gradually decrease in the radial outward direction of the bearing baffle 5 based on the depth of the central portion 511. Thus, the flinging section of the second lubricating oil channel 62 is formed as an arc-shaped flow channel inclined toward the side where the gear shaft 3 is located, so that it is easier to fling the lubricating oil directly between the inner and outer rings of the first bearing 4 during the rotation of the gear shaft 3.

[0035] Continuing to refer to Figure 2 As shown, the bearing baffle 5 is also provided with two mounting holes 52 extending through from the first surface to the second surface in the axial direction thereof. The two mounting holes 52 are arranged in the center of the bearing baffle 5 in the diameter direction of the bearing baffle 5. The gear shaft 3 is provided with threaded holes corresponding to the two mounting holes 52. Bolts can pass through the corresponding mounting holes 52 and threaded holes, thereby fixing the bearing baffle 5 to the gear shaft 3. The mounting holes 52 are arranged in the circumferential direction of the bearing baffle 5 away from the radial extension 512 to avoid the bolts passing through the mounting holes 52 from blocking the flow of lubricating oil through the radial extension 512. It should be understood that the number of mounting holes 52 is not limited to two, but can also be three or more.

[0036] Industrial applicability

[0037] The bearing lubricating device according to the present application is particularly suitable for lubricating the shaft end bearing of a transmission of a working machine such as a wheel loader. However, it should be understood that the bearing lubricating device according to the present application can also be used in other devices that require lubrication of the end side bearing of a gear shaft, such as a motor vehicle.

[0038] The gearbox gear shaft in the prior art is generally supported by two end bearings on a shell composed of a box body and a cover body. The bearings on both sides are embedded in the shell, and only the splash of the gears in the box body cannot meet the lubrication requirements of the bearings. Insufficient lubrication will increase the noise inside the gearbox and reduce the service life of the bearings. To solve this problem, lubricating oil is introduced at one end of the gear shaft, and the oil channel specially designed in the gear shaft is used to forcibly lubricate the bearings on both sides. When the end of the gear shaft is a closed cavity, the oil channel can directly penetrate the gear shaft, and the lubricating oil can enter the closed cavity from the oil channel to ensure that the bearings have sufficient lubricating oil. However, when the end of the gear shaft is an open cavity, the lubricating oil cannot accumulate, so the bearings cannot be provided with sufficient lubricating oil.

[0039] Compared with the prior art, the bearing lubricating device according to the utility model is fixed with a bearing baffle 5 at the first end of the gear shaft 3 on the side of the open cavity, and a groove 51 is arranged on the side of the bearing baffle 5 facing the gear shaft 3. Therefore, the bearing baffle 5 and the end face of the gear shaft 3 jointly define a second lubricating oil channel 62 in communication with a first lubricating oil channel 61 formed in the interior of the gear shaft 3. During the operation of the working machine, as the gear shaft 3 and the bearing baffle 5 fixed thereto rotate at high speed, the lubricating oil can be thrown out and splashed onto the first bearing 4 through the first lubricating oil channel 61 and the second lubricating oil channel 62, ensuring that the first bearing 4 can be fully lubricated. Therefore, the noise inside the gearbox can be reduced and the service life of the first bearing 4 can be prolonged.

[0040] Various modifications and changes can be made to the embodiments disclosed herein without departing from the scope or spirit of the present application. Other embodiments of the present application will be apparent to those of ordinary skill in the art from the disclosure and description of this application. This specification and the disclosed examples are to be considered exemplary and not restrictive in any way. The true scope of the present application is set forth in the following claims and their equivalents.

Claims

1. A bearing lubricating device for lubricating a shaft end bearing of a transmission, said transmission comprising a housing (1) and a gear shaft (3), said housing (1) being provided with a support portion (11) having a first through hole (12), a first end of said gear shaft (3) being supported in said first through hole (12) via a first bearing (4), characterized in that, The bearing lubricating device comprises a bearing baffle (5) fixed to the first end of the gear shaft (3) and a first lubricating oil channel (61) formed inside the gear shaft (3), wherein the bearing baffle (5) is provided with a groove (51) on the side thereof facing the gear shaft to jointly define a second lubricating oil channel (62) in communication with the first lubricating oil channel (61) with the first end of the gear shaft.

2. The bearing lubrication apparatus of claim 1, wherein The groove (51) comprises a central part (511) in communication with the first lubricating oil channel (61) and a radially extending part (512) extending from the central part (511) to the outer periphery of the bearing baffle (5).

3. The bearing lubrication apparatus of claim 2, wherein, The groove (51) comprises two radially extending parts (512) arranged opposite to each other along the diameter direction of the bearing baffle (5).

4. The bearing lubrication apparatus of claim 2, wherein The radially extending part (512) and the central part (511) have the same recess depth.

5. The bearing lubrication apparatus of claim 2, wherein, The recess depth of the radially extending part (512) gradually decreases in the outward radial direction of the bearing baffle (5).

6. The bearing lubrication apparatus of claim 2, wherein The bearing baffle (5) is further provided with a mounting hole (52) extending therethrough in the axial direction, so as to fix the bearing baffle (5) to the gear shaft (3) by means of a bolt passing through the mounting hole.

7. The bearing lubrication apparatus of claim 6, wherein The mounting hole (52) and the radially extending part (512) are arranged in a circumferential direction of the bearing baffle (5).

8. The bearing lubrication apparatus of any one of claims 1 to 7, wherein, An open cavity is formed between the outer peripheral surface of the bearing baffle (5) and the inner peripheral surface of the supporting part (11).

9. The bearing lubrication apparatus of any one of claims 1 to 7, wherein, The gearbox further comprises a cover (2) connected to the open end of the box body (1), the cover (2) being provided with a second through hole (21) opposite to the first through hole (12), the second end of the gear shaft (3) opposite to the first end being supported to the second through hole (21) via a second bearing (7), the gearbox further comprising a bearing end cover (8) connected to the side of the cover away from the supporting part (11) and abutting against the outer ring of the second bearing, so as to form a closed cavity (9) for lubricating the second bearing (7), the bearing lubricating device further comprising a third lubricating oil channel (63) formed inside the gear shaft (3), the third lubricating oil channel being in communication with the first lubricating oil channel (61) and the closed cavity.

10. A work machine characterized by, The gearbox comprises a gearbox and the bearing lubricating device according to any one of claims 1 to 9. The gearbox comprises a gearbox and the bearing lubricating device according to any one of claims 1 to 9.

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