CN108869023B

CN108869023B - Self-lubricating system of power takeoff

Info

Publication number: CN108869023B
Application number: CN201810597050.0A
Authority: CN
Inventors: 谢帮亮; 林秀丹; 周红梅; 吴鑫淼
Original assignee: Quanzhou Kinho Construction Machinery Technology Co ltd
Current assignee: Quanzhou Kinho Construction Machinery Technology Co ltd
Priority date: 2016-08-20
Filing date: 2016-08-20
Publication date: 2020-05-01
Anticipated expiration: 2036-08-20
Also published as: CN108869023A; CN106224092B; WO2018036099A1; CN108869022B; CN108869022A; CN106224092A

Abstract

The invention provides a self-lubricating system of a power takeoff, which comprises a shell, a driving gear, a transition gear, an output gear and a transition wheel shaft, wherein the output gear is positioned above the side of the transition gear, an oil nozzle is arranged on the shell at a position corresponding to a meshing point between the output gear and the transition gear, a bearing and a bearing end cover are sleeved on the transition wheel shaft, the transition gear is sleeved on the bearing, a groove is formed in the shell, an oil storage cavity is formed between the groove and the bearing end cover, and a lubricating channel communicated with the oil storage cavity is formed in the transition wheel shaft. Through set up lubricated passageway on the transition shaft, utilize the pressure differential between lubricated passageway and the oil storage chamber to lubricate the bearing, effectively ensured the supply of lubricating oil, lubricated effect is relatively better, compares with the technical scheme that sets up the oil circuit on the casing of tradition, and structure and simple process, the processing degree of difficulty are low and lubricated effect is relatively better.

Description

Self-lubricating system of power takeoff

The invention is a divisional application of the invention patent with the patent number ZL 201610696307.9 and the name of 'a self-lubricating system of a power takeoff'.

Technical Field

The invention relates to a lubricating system, in particular to a self-lubricating system of a power takeoff.

Background

In a special vehicle such as an excavator, the engine is required to provide power for the vehicle to run, and a part or all of the power provided by the engine is also required to drive other components, so that a power takeoff needs to be mounted on the engine of the special vehicle.

Conventional power take-offs typically include a drive gear, a transition gear, and an output gear that mesh in sequence, and a lubrication system for lubricating the various gears, wherein the lubrication system is typically complex in construction. The utility model discloses an engine power takeoff with built-in lubricated oil duct as that chinese utility model patent of publication number CN204226002U discloses, including casing, shaft gear, oil pocket, front bearing, rear bearing, establish the boss at the casing front end, have the oil feed way of direct oil pocket on the boss, the outer port of oil feed way is sealed by sealed plug screw assembly, has the transition oil duct on the preceding terminal surface of boss to access to the oil feed way, and the oil-out on transition oil duct and the rear gear room corresponds. The oil inlet channel is in a step shape, the diameter of the oil inlet channel on the inner side close to the oil cavity is 2-4 mm, and the diameter of the oil inlet channel on the outer side is 7-9 mm. The sealing plug screw assembly comprises a plug screw and an O-shaped sealing ring. The transition oil duct is connected with the oil outlet of the rear gear chamber in an assembling relationship, and engine oil sequentially flows through the oil outlet of the rear gear chamber, the transition oil duct and the step-shaped oil inlet duct and then is sprayed to an oil cavity in the power takeoff shell so as to lubricate a bearing in the power takeoff assembly. However, since the casing of the power takeoff is generally a casting, the process of arranging the oil passage in the casting is complex, the processing difficulty is relatively high, and the lubricating effect needs to be improved.

In view of the above, the applicant has made an intensive study on a lubrication system of a power takeoff, and has made the present invention.

Disclosure of Invention

The invention aims to provide a self-lubricating system of a power takeoff, which has the advantages of simple structure and process, low processing difficulty and relatively good lubricating effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a self-lubricating system of power takeoff, includes the casing and sets up driving gear, transition gear and output gear that just mesh in proper order in the casing still including fixing transition shaft in the casing, output gear is located transition gear's side top, the casing with output gear with the corresponding position department of meshing point between the transition gear is provided with the fuel sprayer, the epaxial cover of transition wheel is equipped with bearing and bearing end cover, the transition gear cover is established on the bearing, seted up flutedly on the casing, the recess with form the oil storage chamber between the bearing end cover, the epaxial set up with the lubricated passageway in oil storage chamber intercommunication of transition wheel.

As an improvement of the present invention, an injection direction of the oil jet nozzle is directed toward a meshing point between the output gear and the transition gear, and a rotation direction of the output gear is directed from a lower end point of the output gear to an upper end point of the output gear through the meshing point between the output gear and the transition gear.

As a modification of the present invention, an opening at one end of the lubrication passage is directed toward the bearing.

As an improvement of the invention, the number of the bearings is two, and a retainer ring fixed on the transition gear is arranged between the two bearings.

As an improvement of the invention, the opening of one end of the lubricating channel facing the bearing is arranged upwards and is positioned between the two bearings, and the lubricating oil level in the oil storage cavity is higher than the horizontal position of the upper end point of the transition wheel shaft.

As an improvement of the invention, baffle rings sleeved on the transition wheel shaft are respectively arranged on opposite sides of the two bearings, an opening of one end of the lubricating channel facing the bearings is positioned between the two baffle rings, and an oil storage tank is formed between the two baffle rings.

As an improvement of the present invention, the bearing is a cylindrical roller bearing.

By adopting the technical scheme, the invention has the following beneficial effects:

through set up lubricated passageway on the transition shaft, utilize the pressure differential between lubricated passageway and the oil storage chamber to lubricate the bearing, effectively ensured the supply of lubricating oil, lubricated effect is relatively better, compares with the technical scheme that sets up the oil circuit on the casing of tradition, and structure and simple process, the processing degree of difficulty are low and lubricated effect is relatively better.

Drawings

FIG. 1 is a schematic diagram of the power takeoff of the present invention;

FIG. 2 is a front view, partially in section, of the power take-off of the present invention with an engine crankshaft and flywheel attached;

fig. 3 is a schematic diagram of a self-lubricating structure of the power takeoff according to the present invention, in which arrows indicate the flow direction of a lubricating fluid.

The designations in the figures correspond to the following:

10-a housing; 20-a drive gear;

30-a transition gear; 31-a transition wheel axle;

32-a bearing; 33-bearing end cap;

34-a retainer ring; 40-an output gear;

41-a first splined bore; 51-bolt;

52-a locating pin; 53-crankshaft;

54-a flywheel; 61-an elastomer;

62-a second splined hole; 63 an angular contact bearing;

71-an oil nozzle; 72-oil reservoir;

73-lubrication channels;

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

The first embodiment.

As shown in fig. 1 and 2, the power takeoff provided by the present embodiment has a compact structure, and includes a casing 10, and a driving gear 20, a transition gear 30 and an output gear 40 disposed in the casing 10 and engaged in sequence, wherein the output gear 40 is located above the transition gear 30, the driving gear 20 is located below the transition gear 30, and the driving gear 20 and the output gear 40 are respectively located at two sides of the transition gear 30.

A connecting structure is arranged between the driving gear 20 and the engine, namely a connecting structure of a power takeoff and the engine. Specifically, the power takeoff of this embodiment further includes a bolt 51 and a positioning pin 52, and the driving gear 20 is respectively provided with through holes and positioning holes, the number of the through holes may be set according to actual needs, in this embodiment, there are five through holes, certainly, there are five corresponding bolts 51, the five through holes are circumferentially arranged on the driving gear 20 with the axis of the driving gear 20 as a center, and only one positioning hole is located between two of the through holes. Each bolt 51 is respectively inserted on each perforation, and the both ends of each bolt are connected with the flywheel and the bent axle of engine respectively, and locating pin 52 alternates in the locating hole, and the both ends of locating pin 52 also respectively insert on the flywheel and the bent axle of engine.

Accordingly, the engine connected to the power take-off of the present embodiment is required to have a crankshaft 53 and a flywheel 54, the flywheel 54 is also provided with a through hole, the through holes are also five and correspond to the through holes on the driving gear 20 one by one, the crankshaft 53 is provided with five threaded holes corresponding to the through holes on the flywheel 54 or the driving gear 20 one by one, that is, the respective screw holes are also circumferentially arranged on the crankshaft 53 centering on the axis of the drive gear 20, and at the same time, the crankshaft 53 and the flywheel 54 are provided with positioning holes at positions corresponding to the positioning holes on the driving gear 20, that is, the corresponding positions of the crankshaft 53, the flywheel 54 and the driving gear 20 are respectively provided with positioning holes, it should be noted that, since the crankshaft 53 of an engine directly commercially available on the market usually already has five circumferentially arranged threaded holes, in actual production, only the flywheel 54 and the drive gear 20 need to be perforated depending on the position of the threaded hole in the crankshaft 53. Each bolt 51 sequentially penetrates through corresponding through holes on the flywheel 54 and the driving gear 20 and is in threaded connection with the corresponding threaded hole, and the positioning pin 52 sequentially penetrates through positioning holes on the flywheel 54, the driving gear 20 and the crankshaft 53, so that connection between the engine and the power takeoff is realized, and the structure is compact and the stability is good.

The transition gear 30 is installed in the casing 10 through a transition wheel shaft 31, that is, the power takeoff of the present embodiment further includes a transition wheel shaft 31 fixed in the casing 10, the transition wheel shaft 31 is a trapezoidal shaft, and a bearing 32 and a bearing end cover 33 are sleeved on the transition wheel shaft 31, wherein the bearing 32 is located between the bearing end cover 33 and a step surface of the transition wheel shaft 31, and the transition gear 30 is sleeved on the bearing 32.

Preferably, in the present embodiment, there are two bearings 32, which are both cylindrical roller bearings, and a retaining ring 34 fixed on the transition gear 30 is disposed between the two bearings 32, where the retaining ring 34 can both separate the two bearings 32 from each other and prevent the transition gear 30 from axially shifting during the rotation process.

The output gear 40 is installed in the housing 10 through an angular contact bearing 63, and a transmission connection structure is provided between the output gear 40 and a transmission shaft of the plunger pump or the hydraulic pump, specifically, the power takeoff of the present embodiment further includes an elastic body 61, and the output gear 40 is provided with a first spline hole 41 coaxial with the output gear 40. Be provided with the first spline with first splined hole 41 complex on the lateral surface of elastomer 61, still offer on the elastomer 61 with plunger pump or hydraulic pump's transmission shaft cooperation and with the coaxial second splined hole 62 of elastomer 61, first spline alternates in first splined hole 41, and output gear 40, first splined hole 41 and the mutual coaxial arrangement of second splined hole 62.

The transmission shaft of the plunger pump or the hydraulic pump needs to be provided with a second spline matched with the second spline hole, and transition fit or interference fit can be adopted between the first spline and the first spline hole 41 and between the second spline and the second spline hole 62. Therefore, the rigid connection between the output gear 40 and the transmission shaft can be changed into flexible connection, the assembly performance is good, the impact of high-frequency severe vibration generated by the spline and the spline hole on a moving element and a sealing element on the plunger pump or the hydraulic pump can be reduced by the buffer action of the elastic body, the output characteristic of the plunger pump or the hydraulic pump is stable, and the service life of the plunger pump or the hydraulic pump can be prolonged by 3-5 years.

Preferably, in the present embodiment, the first spline hole 41 and/or the second spline hole 62 have involute splines, and the use of the involute splines helps to improve the stability and reliability of the connection structure.

In addition, as shown in fig. 1-3, the power takeoff device provided in this embodiment further includes a self-lubricating system, which includes three structures, namely, a low gear lubricating structure, a high gear lubricating structure and a storage type lubricating structure, specifically, an oil groove (not shown in the figure) filled with lubricating oil is disposed at the bottom of the inner cavity of the casing 10, and the lower portion of the driving gear 20 is immersed in the oil groove, so that, in use, the lubricating oil in the oil groove can be adsorbed on the teeth of the driving gear 20, and is brought to the upper end of the driving gear 20 along with the rotation of the driving gear 20, and then flows downward under the action of gravity to lubricate the driving gear 20 and the corresponding bearing, where the above structures are the low gear lubricating structures.

The inner cavity side wall of the housing 10 is provided with an oil supply device at a position corresponding to a mesh point between the output gear 40 and the transition gear 30, but of course, the oil supply device may be located at a position corresponding to a lower portion of the output gear 40. In the present embodiment, the oil supply means is an oil jet 71, that is, the oil jet 71 is provided at a position corresponding to the meshing point between the housing 10 and the output gear 40 and the transition gear 30. The oil jet 71 is connected to an oil supply pipe outside the power take-off, and the jet direction thereof is toward the meshing point between the output gear 40 and the transition gear 30, however, the specific jet angle needs to be set according to the type of the actual oil jet 71, for example, an oil jet which injects lubricating oil in a parabolic manner, and at this time, the end point of the parabola should be ensured to be located at the meshing point between the output gear 40 and the transition gear 30, and preferably, may be located on the upward tooth surface of the corresponding tooth of the transition gear 30. Meanwhile, the rotation direction of the output gear 40 is a direction from the lower end point of the output gear 40 to the upper end point of the output gear 40 through the mesh point between the output gear 40 and the transition gear 30, for example, when the output gear 40 is located at the upper right side of the transition gear 30, the rotation direction of the output gear 40 should be a counterclockwise direction, and on the contrary, the rotation direction of the output gear 40 should be a clockwise direction. When the lubricating structure is used, lubricating oil sprayed by the oil spray nozzle 71 can be adsorbed on the gear teeth of the output gear 40, the upper end of the output gear ring 40 is driven along with the rotation of the output gear 40 and then flows downwards under the action of gravity to lubricate the output gear 40 and a corresponding bearing, and the structure is the lubricating structure of the high-position gear.

It should be noted that the lubricating structure of the high-order gear can be used not only in the power takeoff, but also in other types of gearboxes as long as the gearbox includes the second gear and the first gear which are meshed in sequence, and the first gear is located above the side of the second gear, specifically, the oil supply device is arranged at a position corresponding to the lower portion of the first gear, and similarly, the oil supply device is preferably an oil nozzle which is arranged at a position corresponding to a meshing point between the first gear and the second gear, the injection direction of the oil nozzle faces the meshing point between the first gear and the second gear, and the rotation direction of the first gear is from the lower end point of the first gear to the upper end point of the first gear through the meshing point between the first gear and the second gear.

The housing 10 is further provided with a groove, an oil storage cavity 72 is formed between the groove and the bearing end cover 33, the oil storage cavity 72 is filled with lubricating oil and is located below the oil nozzle 71, so that the oil storage cavity 72 can receive the lubricating oil which drips from the oil nozzle 71 or is reflected and dripped on the output gear 40 or the transition gear 30 by the oil nozzle 71. The oil storage chamber 72 is provided with a lubricating channel 73 communicated with the oil storage chamber 72 on the transition wheel shaft 31, one end of the lubricating channel 73 is opened towards the bearing 32, and the other end is connected with the oil storage chamber 72. In the present embodiment, the lubrication passage 73 is disposed upward toward the opening of one end of the bearings 32 and between the two bearings 32, while the lubricant level in the reservoir chamber 72 is higher than the level of the upper end point of the transition wheel shaft 31. When the lubricating oil storage structure is used, lubricating oil in the oil storage cavity 72 can overflow from the lubricating channel 73 to the opening at one end of the bearing 32 under the action of hydraulic pressure to lubricate the bearing 32, meanwhile, the lubricating oil overflowing to the bearing 32 can flow downwards to the transition wheel shaft 31 under the action of gravity to lubricate the transition wheel shaft 31, and the structure is a storage type lubricating structure.

Preferably, for the above-mentioned storage-type lubrication structure, a stop ring sleeved on the transition wheel shaft 31 may be further provided on the opposite sides of the two bearings 32, respectively, an opening of the end of the lubrication channel 73 facing the bearings 32 is located between the two stop rings, and an oil storage tank is formed between the two stop rings. Certainly, the lubricating oil liquid level in the oil storage cavity 72 needs to be higher than the upper end point of retaining ring, so, the oil storage tank can be filled up with to the lubrication in the lubrication channel 73 earlier, then overflow to the bearing 32 from the upper end of oil storage tank and lubricate bearing 32, lubricating oil in the oil storage tank also can obtain certain centrifugal force along with the rotation of transition gear 30 simultaneously, lubricate transition gear 30 and transition shaft 31, this kind of lubricating structure not only lubricates effectually, and have certain radiating effect, the heat that gear rotation produced can be taken away along with the flow of lubricating oil promptly.

Example two.

This embodiment provides a transmission connection structure of gear, and this structure is the same with being provided with the transmission connection structure on the transmission shaft of output gear 40 and plunger pump or hydraulic pump in the embodiment one, and is specific, this structure includes gear and the transmission shaft of being connected with this gear drive, and sets up on this gear and this gear coaxial have a splined hole.

This structure still includes the elastomer, be provided with on this elastomer with first spline hole complex first spline, second spline hole has still been seted up on this elastomer, be provided with on the transmission shaft with second spline hole complex second spline, first spline alternates in first spline hole, second spline alternates in the second spline hole, and assembly back gear, elastomer and transmission shaft are coaxial arrangement each other. Transition fit or interference fit is adopted between the first spline and the first spline hole and between the second spline and the second spline hole.

Preferably, in this embodiment, the first spline and/or the second spline are involute splines.

The transmission connection structure that this embodiment provided can change the rigid connection between gear and the transmission shaft into flexonics, and the assembly nature is better, and the cushioning effect of elastomer can reduce the violent vibrations of high frequency that spline and splined hole produced, and output characteristic is also comparatively steady, alternates the elastomer in the gear through the first spline that sets up on the elastomer in addition, and the structure is comparatively compact.

The present invention is described in detail with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the above embodiments, and those skilled in the art can make various modifications to the present invention according to the prior art, such as changing the oil jet 71 in the first embodiment to another oil supply device, and so on, which all belong to the protection scope of the present invention.

Claims

1. The utility model provides a self-lubricating system of power takeoff, is in including casing and setting just engaged with driving gear, transition gear and output gear in proper order in the casing, its characterized in that still including fixing transition shaft in the casing, output gear is located transition gear's side top, the casing with output gear with the corresponding position department of meshing point between the transition gear is provided with the fuel sprayer, the epaxial cover of transition wheel is equipped with bearing and end cover, the transition gear cover is established on the bearing, seted up flutedly on the casing, the recess with form the oil storage chamber between the end cover, the epaxial set up of transition wheel with the lubricated passageway of oil storage chamber intercommunication.

2. The self-lubricating system of a power takeoff according to claim 1, wherein an injection direction of said oil jet nozzle is directed toward a mesh point between said output gear and said transition gear, and a rotation direction of said output gear is from a lower end point of said output gear to an upper end point of said output gear through said mesh point between said output gear and said transition gear.

3. The power takeoff self-lubricating system as claimed in claim 1, wherein an end of said lubrication passage opens toward said bearing.

4. The self-lubricating system of a power takeoff according to claim 1, wherein there are two of said bearings, and a retainer ring secured to said transition gear is disposed between said two of said bearings.

5. The self-lubricating system of the power takeoff device as claimed in claim 4, wherein the opening of the lubricating passage towards one end of the bearings is arranged upward and is located between the two bearings, and the lubricating oil level in the oil storage chamber is higher than the horizontal level of the upper end point of the transition wheel shaft.

6. The self-lubricating system of the power takeoff device as claimed in claim 5, wherein the opposite sides of the two bearings are respectively provided with a retaining ring which is sleeved on the transition wheel shaft, the opening of the end of the lubricating channel facing the bearings is positioned between the two retaining rings, and an oil storage tank is formed between the two retaining rings.

7. The self-lubricating system of a power take-off of any of claims 1-6, wherein the bearing is a cylindrical roller bearing.