Buffer type output shaft assembly for planetary gearbox

Abstract

The utility model discloses a buffer type output shaft assembly for a planetary gearbox, and belongs to the field of engineering machinery. The telescopic buffering assembly is arranged on the outer side of the bearing, and the defects that in the prior art, when a loader steers, the bearing is damaged by axial force, and oil leaks from an oil seal are overcome. The device mainly comprises a front flange, a rear flange, a check ring, an output shaft, bearings, a telescopic buffering assembly, an inner sealing sleeve and an outer sealing sleeve, the front flange and the rear flange are fixedly connected with a front transmission shaft and a rear transmission shaft respectively, the two sides of the output shaft are installed in gearbox body holes through the bearings respectively, and the telescopic buffering assembly is arranged on the outer sides of the bearings. Compared with the prior art, under the action of the axial force of the vehicle transmission shaft, the acting force of the axial force on the bearings can be buffered through the deformability of the telescopic buffering assembly, the service life of the two bearings is prolonged, and the risk of oil leakage of the oil seal is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of engineering machinery transmission, and particularly relates to an output shaft assembly of a planetary gearbox. Background Technique

[0002] Due to its characteristics of high transmission efficiency, compact structure, reliable operation, and strong adaptability, planetary gearboxes are widely used in domestic five-ton loaders. The front end and the rear end of the output shaft assembly of the planetary gearbox transfer power to the front and rear drive axles through the front drive shaft and the rear drive shaft respectively, driving the front and rear wheels to realize the driving of the whole machine.

[0003] Figure 1 As shown, in the existing output shaft assembly of the planetary gearbox, the front flange 10 is connected to the front drive shaft, the rear flange 1 is connected to the rear drive shaft, and the output shaft 8 is installed in the hole of the gearbox housing 4 by means of two deep groove ball bearings 7. During the steering operation of the whole machine, the front and rear drive shafts will apply an axial force to the output shaft 8, and this axial force directly acts on the two deep groove ball bearings 7 at the front end and the rear end of the output shaft 8, directly reducing the service life of the two deep groove ball bearings 7. When the axial force is too large, it will directly cause the failure of the deep groove ball bearings 7, and at the same time cause damage to the outer seal sleeve 3 and oil leakage of the gearbox. Content of the Utility Model

[0004] To solve the above technical problems, the utility model provides a buffer-type output shaft assembly for a planetary gearbox, which can weaken the influence of the axial force during the steering of the whole machine on the bearing life and reduce the oil leakage fault of the gearbox.

[0005] The utility model provides a buffer-type output shaft assembly for a planetary gearbox, which includes a gearbox housing and an output shaft. The output shaft is arranged in the gearbox housing, and both ends of the output shaft are respectively sleeved in the corresponding housing holes in the gearbox housing by means of a bearing. A rear flange and a front flange are respectively arranged at the left end and the right end of the output shaft. An inner seal sleeve sleeved on the output shaft is respectively arranged between the rear flange and the corresponding bearing and between the front flange and the corresponding bearing. A telescopic buffer assembly for realizing the buffer of the bearing displacement is arranged between the inner seal sleeve and the corresponding bearing. During the steering operation of the whole machine, under the action of the axial force of the drive shaft, the output shaft can axially move in the housing hole of the gearbox by relying on the deformation ability of the telescopic buffer assembly itself, so as to relieve the direct action of the axial force of the drive shaft on the bearing.

[0006] Preferably, the telescopic buffer assembly includes a disc spring. The disc spring is sleeved on the output shaft, and the conical top surface of the disc spring is attached to the end surface of the corresponding inner seal sleeve, and the conical bottom surface of the disc spring is attached to the end surface of the outer ring of the corresponding bearing.

[0007] Preferably, the telescopic buffer assembly includes a tower spring. The tower spring is sleeved on the output shaft, and the tapered top surface of the tower spring is in contact with the end surface of the corresponding inner seal sleeve, and the tapered bottom surface of the tower spring is in contact with the end surface of the outer ring of the corresponding bearing.

[0008] Further: The bearing is a tapered roller bearing.

[0009] Further: An outer seal sleeve is arranged in the corresponding box body hole, and the outer seal sleeve is located radially outside the corresponding inner seal sleeve. A retaining ring capable of preventing the outer seal sleeve from moving towards the inside of the gearbox body is arranged in the corresponding box body hole. An oil seal is arranged in the radial gap between the outer seal sleeve and the inner seal sleeve.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: During the whole machine steering operation, the axial force received by the output shaft is directly transmitted to the disc spring through the bearing. The disc spring utilizes its own deformation ability to realize the displacement buffer of the bearing for the axial force, thereby improving the service life of the bearing. The improvement of the service life of the bearing is beneficial to improving the service life of the outer seal sleeve, thereby greatly reducing the occurrence frequency of gearbox oil leakage faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of an output shaft assembly in the prior art;

[0012] Figure 2 is a schematic structural diagram of the buffer type output shaft assembly of the present invention.

[0013] Reference numerals in the drawings: 1, rear flange; 2, inner seal sleeve; 3, outer seal sleeve; 4, box body; 5, sealing ring; 6, retaining ring; 7, deep groove ball bearing; 8, output shaft; 9, output gear; 10, front flange; 11, disc spring; 12, bearing; 13, axial clearance. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] In order to facilitate the understanding of the present invention 1-2, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0015] The present invention provides a buffer type output shaft assembly for a planetary gearbox (such as Figure 2As shown in the figure, it includes a transmission case body 4 and an output shaft 8. The transmission case body 4 is a component of a planetary transmission. The planetary transmission is a well-known and mature technical product in the field of construction machinery. Therefore, the working principle of the planetary transmission and the specific structure of the transmission case body 4 will not be described in detail here. The output shaft 8 is arranged inside the transmission case body 4, and both ends of the output shaft 8 are respectively sleeved in the corresponding case holes inside the transmission case body 4 through a bearing 12. By using the support of the two bearings 12 for both ends of the output shaft 8, the rotation of the output shaft 8 can be realized. In practical applications, an output gear 9 is arranged on the output shaft 8, and the output gear 9 adopts a spline drive method to achieve synchronous rotation with the output 8. A rear flange 1 and a front flange 10 are respectively arranged at the left end and the right end of the output shaft 8. Both the rear flange 1 and the front flange 10 are sleeved on the corresponding ends of the output shaft 8 through a spline connection method, and pressing plates are respectively arranged at both ends of the output shaft 8 for pressing and fixing the corresponding rear flange 1 and front flange 10. Both the rear flange 1 and the front flange 10 are connected to the corresponding transmission shafts. The power source of the whole machine is transmitted to the output gear 9, and the output gear 9 transmits the power to the corresponding transmission shafts through the rear flange 1 and the front flange 10. An inner seal sleeve 2 sleeved on the output shaft 8 is respectively arranged between the rear flange 1 and the corresponding bearing 12 and between the front flange 10 and the corresponding bearing 12. In practical applications, the outer end face of the inner seal sleeve 2 is attached to the end face of the corresponding rear flange 1 or front flange 10, so as to realize the outward movement limit of the inner seal ring 2 on the output shaft 8. A telescopic buffer assembly for realizing the displacement buffer of the bearing 12 is arranged between the inner seal sleeve 2 and the corresponding bearing 12. During the steering operation of the whole machine, the axial forces of the front and rear transmission shafts of the whole machine act on the corresponding bearings 12 through the rear flange 1 and the front flange 10. This axial force is directly transmitted to the telescopic buffer assembly through the bearing 12, and the telescopic buffer assembly uses its own deformation ability to realize the adaptive axial movement of the bearing 12. After the whole machine resumes the straight operation condition, the axial force of the transmission shaft disappears, and the output shaft 8 returns to the original position under the elastic force of the two groups of telescopic buffer assemblies.

[0016] On the basis of the above embodiments, in this specific embodiment, two specific embodiments of the telescopic buffer assembly are provided. The specific implementation method of the first specific embodiment of the telescopic buffer assembly is as follows: the telescopic buffer assembly includes a disc spring 11, and the disc spring 11 is a mature technical product in the prior art, so the specific structure of the disc spring 11 is not described in detail; the disc spring 11 is sleeved on the output shaft 8, and the conical top end surface of the disc spring 11 is in contact with the corresponding end surface of the inner sealing sleeve 2, and the conical bottom end surface of the disc spring 11 is in contact with the corresponding outer surface of the bearing 12. The end faces of the rings are fitted. In actual applications, the specific specification parameters of the disc spring 11 are determined according to the size of the axial force transmitted by the output shaft 8, the specifications of the bearing 12 and the regulations of the box hole of the gearbox housing 4, so that the disc spring 11 can provide a better axial impact buffering effect for the bearing 12. At the same time, it is ensured that the bearing 12 can be quickly reset after the axial force disappears. In order to facilitate the disc spring 11 to be able to deform elastically freely, here, when the disc spring 11 maintains the initial working state, an axial gap 13 is provided on the outside of the disc spring 11 to facilitate its deformation and displacement.

[0017] The specific implementation method of the second specific embodiment of the telescopic buffer component is as follows: the telescopic buffer component includes a tower spring, which is a mature technical product in the prior art, so the specific structure of the spring is no longer described in detail. The tower spring is sleeved on the output shaft 8, and the top conical end surface of the tower spring is fitted with the corresponding end surface of the inner sealing sleeve 2, and the bottom conical end surface of the tower spring is fitted with the corresponding outer ring end surface of the bearing 12. In actual application, the specific specification parameters of the tower spring are specifically determined according to the magnitude of the axial force transmitted by the output shaft 8, the specifications of the bearing 12 and the regulations of the case hole of the gearbox case 4, so that the tower spring can provide a better axial impact buffering effect on the bearing 12, and at the same time, ensure that the bearing 12 can be quickly reset after the axial force disappears.

[0018] In practical applications, the elastic deformation capability of the disc spring 11 or the tower spring can be used to buffer the axial impact force of the bearing 12, thereby increasing the service life of the bearing 12.

[0019] On the basis of the above embodiment, in order to improve the axial and radial load-bearing capacity of the bearing 12, the bearing 12 is a tapered roller bearing. The tapered roller bearing is a mature technical product in the prior art. The structure of the tapered roller bearing is not introduced in detail. The tapered roller bearing can withstand larger radial and axial loads, and the tapered roller bearing can withstand axial forces from the front and rear directions respectively, thereby improving the ability of the output shaft 8 to resist external axial forces.

[0020] On the basis of the above embodiments, in order to improve the sealing performance at the box hole corresponding to the installation of the output shaft 8 on the transmission case body 4, an outer sealing sleeve 3 is provided in the corresponding box hole, and the outer sealing sleeve 3 is located radially outside the corresponding inner sealing sleeve 2. A retaining ring 6 capable of preventing the outer sealing sleeve 3 from moving towards the inside of the transmission case body is provided in the corresponding box hole. An oil seal 5 is provided in the radial gap between the outer sealing sleeve 3 and the inner sealing sleeve 2. By utilizing the combined sealing characteristics of the outer sealing sleeve 3, the oil seal 5 and the inner sealing sleeve 2, the sealing of the corresponding box hole of the transmission case body 4 is achieved.

[0021] The axial impact force received by the bearing 12 is effectively absorbed and buffered by the disc spring 11 or the conical spring, thereby improving the service life of the bearing 12. The improvement of the service life of the bearing 12 is beneficial to improving the service life of the outer sealing sleeve 3, thus greatly reducing the occurrence frequency of transmission oil leakage faults.

[0022] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A buffer-type output shaft assembly for a planetary gearbox, comprising a gearbox housing (4) and an output shaft (8). The output shaft (8) is arranged inside the gearbox housing (4), and both ends of the output shaft (8) are respectively sleeved in corresponding housing holes inside the gearbox housing (4) through a bearing (12). A rear flange (1) and a front flange (10) are respectively arranged at the left end and the right end of the output shaft (8). An inner sealing sleeve (2) sleeved on the output shaft (8) is respectively arranged between the rear flange (1) and the corresponding bearing (12) and between the front flange (10) and the corresponding bearing (12). It is characterized in that, A telescopic buffer assembly for realizing the displacement buffer of the bearing (12) is arranged between the inner seal sleeve (2) and the corresponding bearing (12).

2. The buffer-type output shaft assembly for a planetary gearbox according to claim 1, wherein: The telescopic buffer assembly includes a disc spring (11), the disc spring (11) is sleeved on the output shaft (8), and the conical top end face of the disc spring (11) is attached to the end face of the corresponding inner seal sleeve (2), and the conical bottom end face of the disc spring (11) is attached to the outer ring end face of the corresponding bearing (12).

3. The buffer type output shaft assembly for a planetary gearbox according to claim 1, characterized in that: The telescopic buffer assembly includes a conical spring, the conical spring is sleeved on the output shaft (8), and the conical top end face of the conical spring is attached to the end face of the corresponding inner seal sleeve (2), and the conical bottom end face of the conical spring is attached to the outer ring end face of the corresponding bearing (12).

4. The buffer type output shaft assembly for a planetary gearbox according to claim 2 or 3, characterized in that: The bearing (12) is a tapered roller bearing.

5. The buffer type output shaft assembly for a planetary gearbox according to claim 4, characterized in that: An outer seal sleeve (3) is arranged in the corresponding box body hole, and the outer seal sleeve (3) is located radially outside the corresponding inner seal sleeve (2). A retaining ring (6) capable of preventing the outer seal sleeve (3) from moving towards the inside of the gearbox box body is arranged in the corresponding box body hole. An oil seal (5) is arranged in the radial gap between the outer seal sleeve (3) and the inner seal sleeve (2).

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