CN111594603A

CN111594603A - Axial limit structure and gear box

Info

Publication number: CN111594603A
Application number: CN202010536759.7A
Authority: CN
Inventors: 王伟康; 张再利; 段振中; 汪星; 徐莎
Original assignee: CRRC Qishuyan Institute Co Ltd
Current assignee: CRRC Qishuyan Institute Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-08-28

Abstract

The embodiment of the invention provides an axial limiting structure and a gear box, and relates to the technical field of limiting structures. The axial limiting structure comprises an end cover and an elastic part connected to the end cover, wherein the end cover is fixedly connected with a shell, one end, far away from the end cover, of the elastic part is used for acting on the end face of a gear shaft, when the gear moves in the direction close to the end cover in the axial direction, the elastic part is used for applying elastic force to the gear shaft, moving in the direction far away from the end cover, so that the gear shaft is limited in the axial direction of the gear shaft, the axial limiting structure realizes axial limiting on the gear shaft through the elastic force, and the axial impact of the gear shaft on the axial limiting structure can be effectively reduced through the buffer action of the elastic part, so that the service life of the axial limiting structure is prolonged.

Description

Axial limit structure and gear box

Technical Field

The invention relates to the technical field of limiting structures, in particular to an axial limiting structure and a gear box.

Background

A gear transmission is a common transmission at present, such as a wheel reduction gear of an automobile. In order to prevent temperature rise expansion, a certain axial gap is reserved between the shaft end of a gear shaft of the gear transmission device and the shell, and meanwhile, the axial limiting structure is arranged on the shell to prevent the gear shaft from axially moving.

However, when the existing axial limiting structure prevents the gear shaft from generating axial movement, axial impact can be generated between the existing axial limiting structure and the gear shaft, and the service life of the axial limiting structure is short. Meanwhile, the axial spacing structure is worn to increase the axial clearance, which is not beneficial to the use of the gear transmission device.

Disclosure of Invention

The invention aims to provide an axial limiting structure which can effectively reduce axial impact with a gear shaft and has long service life.

The invention also aims to provide the gear box, which can effectively reduce the axial impact between the axial limiting structure and the gear shaft and has long service life.

Embodiments of the invention may be implemented as follows:

the embodiment of the invention provides an axial limiting structure, which is used for being matched with a gear transmission device, wherein the gear transmission device comprises a gear shaft and a casing, the axial limiting structure comprises an end cover and an elastic piece connected to the end cover, the end cover is used for being fixedly connected with the casing, one end of the elastic piece, which is far away from the end cover, is used for acting on the end surface of the gear shaft, and when the gear moves in the direction that the gear axially approaches the end cover, the elastic piece is used for applying elastic force, which moves in the direction that the gear axially leaves the end cover, to the gear shaft so as to limit the gear shaft in the axial direction of the gear shaft. Thereby reducing the axial impact of the gear shaft on the axial limiting structure.

Optionally, the axial limiting structure further includes wear-resisting plates, the elastic member is disposed between the wear-resisting plates and the end covers, the elastic member and the wear-resisting plates are sequentially disposed along a preset direction, one end of the wear-resisting plate, which is far away from the end covers, is provided with a contact surface, and the contact surface is used for contacting with the end surface of the gear shaft, so that the elastic member acts on the end surface of the gear shaft. The wear-resisting plate is in contact with the end face of the gear shaft, so that the wear caused by the rotation of the gear shaft relative to the axial limiting structure is reduced.

Optionally, the end cover is provided with a clamping groove, the wear-resisting plate is provided with a clamping portion, and the clamping portion is clamped in the clamping groove so that the wear-resisting plate is connected with the end cover;

the size of the clamping groove in the preset direction is larger than that of the clamping portion in the preset direction, so that the wear-resisting plate can move along the preset direction relative to the end cover.

Optionally, along the circumference of end cover, the joint groove has two relative terminal surfaces, two the terminal surface is used for right respectively the joint portion is spacing, in order to prevent the antifriction plate is relative the end cover rotates.

Optionally, the end cap includes a cover body and a pressing plate; a groove is formed in the cover body, and an opening is formed in one end, close to the wear-resisting plate, of the groove along the preset direction; the pressing plate is fixedly connected with the cover body, and the pressing plate covers the opening to form the clamping groove.

Optionally, an oil inlet channel is formed in the end cover, an oil outlet is formed in the wear-resisting plate, the oil inlet channel is communicated with the oil outlet, and the oil outlet is used for supplying oil to the contact surface. Increased lubrication of the contact surfaces helps to further reduce wear.

Optionally, the oil inlet channel is including the inlet port, the space that flows and the first communicating hole that communicate in proper order, first communicating hole with the oil outlet intercommunication.

Optionally, the axial limiting structure includes a first portion and a second portion located at two sides of a preset plane, and the preset plane is overlapped with an axis of the axial limiting structure; the oil inlet hole is formed in the end cover of the first portion, the oil outlet hole is formed in the wear-resisting plate of the second portion, and the distance between the axis of the oil outlet hole and the preset plane is equal to the distance between the axis of the oil outlet hole and the axis of the axial limiting structure.

Optionally, the axial limiting structure further comprises a return rod, and the return rod penetrates through the first communication hole and is connected with the wear-resisting plate; the return rod is in sliding fit with the end cover, and when the gear shaft moves in the preset direction, the return rod slides relative to the end cover in the preset direction to open or close the first communication hole. Thereby realize the self-lubricating of axial limit structure according to the axial float of gear shaft.

Optionally, one end of the return rod, which is far away from the wear-resisting plate, is provided with a limiting protrusion, and the size of the limiting protrusion is larger than the radial size of the first communication hole; when the limiting bulge abuts against the end cover, the limiting bulge seals the first communicating hole so as to close the first communicating hole; when the limiting protrusion is separated from the end cover, the first communicating hole is opened.

Optionally, the axial limiting structure further includes a first sealing element, the first sealing element is located between the limiting protrusion and the end cover, and when the limiting protrusion abuts against the end cover through the first sealing element, the first communication hole is closed.

Optionally, a lubricating oil path communicated with the oil outlet is arranged on the contact surface.

Optionally, the lubricating oil path includes a first lubricating oil channel extending along the circumferential direction of the wear plate and a second lubricating oil channel extending along the radial direction of the wear plate, and the first lubricating oil channel, the second lubricating oil channel and the oil outlet are communicated with each other.

Optionally, an oil storage cavity is formed between the end cover and the wear-resisting plate, and the oil inlet channel is communicated with the oil outlet through the oil storage cavity; and a second communication hole is formed in the wear-resisting plate and is simultaneously communicated with the lubricating oil way and the oil storage cavity, so that redundant lubricating oil after the contact surface is lubricated can flow back to the oil storage cavity through the second communication hole. And the circulation lubrication is realized.

Embodiments of the present invention also provide a gearbox. This gear box includes axial limit structure, and axial limit structure is used for cooperating with gear drive, gear drive includes gear shaft and casing, axial limit structure include the end cover and connect in the elastic component of end cover, the end cover be used for with casing fixed connection, the elastic component is kept away from the one end of end cover is used for acting on the terminal surface of gear shaft, works as the gear axial is close to during the direction motion of end cover, the elastic component is used for right the gear shaft is applyed to keeping away from the elastic force of the direction motion of end cover, with right the gear shaft is followed the axial of gear shaft is carried on spacingly.

The axial limiting structure and the gearbox provided by the embodiment of the invention have the beneficial effects that:

the embodiment of the invention provides an axial limiting structure which is used for being matched with a gear transmission device. The gear transmission device comprises a gear shaft and a machine shell. Axial limit structure includes the end cover and connects in the elastic component of end cover, the end cover is used for with casing fixed connection, the one end that the end cover was kept away from to the elastic component is used for acting on the terminal surface of gear shaft, when the gear axial was close to the direction motion of end cover, the elastic component is used for applying the elastic force to the gear shaft to the direction motion of keeping away from the end cover, thereby carry on spacingly to the axial of gear shaft along the gear shaft, because axial limit structure passes through the elastic force and realizes spacingly to the axial of gear shaft, cushioning effect through the elastic component, can effectively reduce the axial impact of gear shaft to axial limit structure, thereby help prolonging axial limit structure.

The embodiment of the invention also provides a gearbox, which comprises the axial limiting structure and the gear transmission device, so that the gearbox also has the beneficial effects of small axial impact and long service life.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic sectional view of a partial structure of a gearbox according to an embodiment of the present invention;

fig. 2 is an exploded view of an axial limiting structure according to an embodiment of the present invention at a first viewing angle;

fig. 3 is an exploded view of an axial limiting structure provided in an embodiment of the present invention at a second viewing angle;

fig. 4 is a schematic overall structural diagram of an axial limiting structure according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view taken at V-V in FIG. 4;

fig. 6 is a schematic structural diagram of a wear plate in an axial limiting structure according to an embodiment of the present invention;

fig. 7 is a partial structural schematic view of an end cap in an axial limiting structure according to an embodiment of the present invention;

FIG. 8 is a schematic sectional view taken at VIII-VIII in FIG. 4;

FIG. 9 is an enlarged view of a portion of the structure at IX in FIG. 5.

Icon: 10-a gearbox; 100-axial limit structure; 110-an end cap; 111-a platen; 112-a cover; 1121-grooves; 1122-a first receiving groove; 1123-a second mounting groove; 113-an oil inlet channel; 1131, an oil inlet hole; 1132 — a flow space; 1133 — a first via; 114-a snap groove; 115-a cover plate; 116-a locking bolt; 117-connecting flange; 120-a wear plate; 121-contact surface; 122-a clamping part; 123-oil outlet; 124-lubricating oil path; 1241-first lubricating oil channel; 1242-second lubricating oil channel; 125-a second communication hole; 126-a second receiving groove; 127-a first mounting groove; 130-an elastic member; 140-a return lever; 141-a limit bump; 142-a spacing pin; 151-first seal; 152-a second seal; 153-preset plane; 154-first portion; 155-a second portion; 156-reservoir chamber; 210-a housing; 220-a gear shaft; 221-end face.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Fig. 1 is a schematic sectional view of a partial structure of a gear box 10 provided in this embodiment, fig. 2 is an exploded view of an axial limiting structure 100 provided in this embodiment at a first viewing angle, and fig. 3 is an exploded view of the axial limiting structure 100 provided in this embodiment at a second viewing angle. Referring to fig. 1 to fig. 3, an axial limiting structure 100 is provided in the present embodiment, and accordingly, a gear box 10 is provided in the present embodiment.

The gearbox 10 includes an axial stop arrangement 100, while the gearbox 10 also includes a gear assembly. The gear assembly includes a housing 210 and a gear shaft 220, the gear shaft 220 being rotatably disposed within the housing 210. The axial limiting structure 100 is installed on the housing 210, and the axial limiting structure 100 is located on one axial side of the gear shaft 220, so that when the gear shaft 220 axially moves, the axial limiting structure 100 axially limits the gear shaft 220. Optionally, the gear shaft 220 is a sun gear and the gear transmission is a planetary transmission.

The axial limiting structure 100 comprises an end cover 110 and an elastic element 130 connected to the end cover 110, the end cover 110 is used for being fixedly connected with the casing 210, one end, far away from the end cover 110, of the elastic element 130 is used for acting on an end face 221 of the gear shaft 220, when the gear shaft 220 moves towards the direction close to the end cover 110, the elastic element 130 is used for applying elastic force to the gear shaft 220, moving towards the direction far away from the end cover 110, and therefore limiting is conducted on the gear shaft 220 along the axial direction of the gear shaft 220, axial limiting of the gear shaft 220 is achieved through the axial limiting structure 100 through the elastic force, through the buffering effect of the elastic element 130, axial impact of the gear shaft 220 on the axial limiting structure 100 can be effectively reduced, and therefore the service life of the.

The axial limiting structure 100 provided in the present embodiment is further described as follows:

fig. 4 is a schematic overall structure diagram of the axial limiting structure 100 provided in this embodiment, and fig. 5 is a schematic cross-sectional structure diagram at v-v in fig. 4. Referring to fig. 1 to 5, in the present embodiment, the axial limiting structure 100 further includes a wear plate 120, the elastic element 130 is disposed between the wear plate 120 and the end cover 110, that is, the end cover 110, the elastic element 130 and the wear plate 120 are sequentially disposed along a predetermined direction, because the axial limiting structure 100 is used for limiting the gear shaft 220 along the axial direction of the gear shaft 220, and the elastic element 130 is used for applying an elastic force to the gear shaft 220 to move in a direction away from the end cover 110, after the axial limiting structure 100 is mounted in the gear transmission, the predetermined direction of the axial limiting structure 100 is the axial direction of the gear shaft 220. The end of the wear plate 120 remote from the end cap 110 has a contact surface 121, the contact surface 121 being adapted to contact an end surface 221 of the gear shaft 220, such that the resilient member 130 acts on the end surface 221 of the gear shaft 220 through the wear plate 120. Further, the contact surface 121 is case hardened to reduce wear.

Fig. 6 is a schematic structural diagram of a wear plate 120 in the axial limiting structure 100 according to the present embodiment, and fig. 7 is a schematic structural diagram of a part of an end cover 110 in the axial limiting structure 100 according to the present embodiment. Referring to fig. 1-7, in the present embodiment, the wear plate 120 and the end cap 110 are both substantially circular, and the wear plate 120 and the end cap 110 are coaxially disposed, and the predetermined direction can be regarded as the axial direction of the wear plate 120 and the end cap 110. The outer circumference of the end cap 110 is provided with a connecting flange 117, the connecting flange 117 is provided with a plurality of mounting holes, and bolts pass through the mounting holes to be screwed with the casing 210, so that the end cap 110 is fixedly connected to the casing 210.

The wear plate 120 is provided with a first mounting groove 127, the end cover 110 is provided with a second mounting groove 1123, the first mounting groove 127 and the second mounting groove 1123 are oppositely arranged, and two ends of the elastic member 130 are respectively arranged in the first mounting groove 127 and the second mounting groove 1123, so that the elastic member 130 is mounted, and the position of the elastic member 130 can be fixed. Optionally, the elastic member 130 is a spring. It will be appreciated that in other embodiments, the type of resilient member 130 may be provided as desired, such as an elastomeric rubber block.

In the present embodiment, the number of the elastic members 130 is four, and accordingly, the number of the first mounting grooves 127 and the second mounting grooves 1123 is also four, and both ends of the four elastic members 130 are disposed in the four first mounting grooves 127 and the four second mounting grooves 1123 in a one-to-one correspondence. It is understood that in other embodiments, the number of the elastic members 130 may be specifically set according to requirements, for example, the number of the elastic members 130 is set to three, and accordingly, the number of the first mounting grooves 127 and the second mounting grooves 1123 is also set to three.

Referring to fig. 5, fig. 6 and fig. 7, in the present embodiment, the end cover 110 has a clamping groove 114, the wear plate 120 has a clamping portion 122, and the clamping portion 122 is clamped in the clamping groove 114, so that the wear plate 120 is connected to the end cover 110. And because be provided with elastic component 130 between antifriction plate 120 and the end cover 110, through the axial impact of elastic force buffering gear shaft 220 to antifriction plate 120 of elastic component 130, consequently set up the size of joint groove 114 in the direction of predetermineeing and be greater than the size of joint portion 122 in the direction of predetermineeing, promptly joint portion 122 card is gone into behind the joint groove 114, joint groove 114 still has certain space in the direction of predetermineeing so that antifriction plate 120 can move along the direction of predetermineeing relative end cover 110, when axial float takes place for gear shaft 220, antifriction plate 120 can move the certain distance to the direction that is close to end cover 110, elastic component 130 absorbs the axial force that gear shaft 220 applyed to antifriction plate 120 this moment, and then reduce the axial impact that antifriction plate 120 received, avoid antifriction plate 120 to receive the damage.

Specifically, the end cap 110 includes a cover 112 and a pressing plate 111. The cover 112 is configured as shown in fig. 7, a groove 1121 is formed in the cover 112, and an end of the groove 1121, which is close to the wear plate 120, has an opening along a predetermined direction, where the opening is a first opening. In other words, the recess 1121 may be regarded as being formed by recessing an end surface of the cover body 112 in a predetermined direction near one end of the wear plate 120. The pressing plate 111 is fixedly connected to the cover 112, so that the first opening is shielded by the pressing plate 111, that is, the first opening of the groove 1121 is closed by the pressing plate 111, and a fastening groove 114 is formed. The size of the clamping groove 114 in the predetermined direction is the groove depth of the recess 1121. Meanwhile, the catching groove 114 has an opening facing inward in the radial direction of the cover 112, and the opening is a second opening through which the catching portion 122 of the wear plate 120 protrudes into the catching groove 114.

When the gear shaft 220 does not axially shift, the wear plate 120 tends to move away from the end cover 110 under the action of the elastic member 130, and the clamping portion 122 abuts against the pressing plate 111 to limit the wear plate 120; when the gear shaft 220 axially moves in a direction approaching the end cover 110, the wear plate 120 compresses the elastic member 130 under the action of the gear shaft 220, and then moves in the direction approaching the end cover 110 until the snap-fit portion 122 abuts against the bottom of the groove 1121. In other words, the catching portion 122 can move only between the pressing plate 111 and the groove bottom of the recess 1121. Optionally, the end cap 110 further includes a locking bolt 116, and the pressing plate 111 is fixedly connected to the cover 112 through the locking bolt 116.

Further, along the circumference of the end cover 110, the clamping groove 114 has two opposite end surfaces, and the two end surfaces are respectively used for limiting the clamping portion 122, that is, the clamping portion 122 is limited between the two end surfaces, so that the wear plate 120 is prevented from rotating around the axial direction of the end cover 110 relative to the end cover 110. Optionally, the groove 1121 is a semicircular groove, an axis of the groove 1121 is parallel to an axis of the end cover 110, two end surfaces of the clamping groove 114 along the circumferential direction of the end cover 110 are two wall surfaces of the groove 1121 along the circumferential direction, and the groove 1121 is a semicircular groove, so that the two wall surfaces are both in a quarter-arc shape. The clamping portion 122 is a protrusion which is arranged on the periphery of the wear-resisting plate 120 and extends radially outwards along the wear-resisting plate 120, and accordingly the clamping portion 122 is semicircular and has the same shape as the groove 1121, so that when the clamping portion 122 is arranged in the groove 1121, the circumferential limitation of the wear-resisting plate 120 is realized through the matching of the clamping portion 122 and the groove 1121. It is understood that in other embodiments, the shape of the groove 1121 may also be set according to requirements, for example, a square block shape, and accordingly, the clamping portion 122 is set to be a square block shape, so that the limitation on the circumferential movement of the wear plate 120 can be achieved through the clamping of the clamping portion 122 and the groove 1121, and meanwhile, the clamping portion 122 can perform a certain range of axial movement in the groove 1121.

Optionally, four grooves 1121 are formed in the cover body 112, the four grooves 1121 are uniformly distributed along the circumferential direction of the cover body 112, correspondingly, four clamping portions 122 are formed in the wear-resisting plate 120, the four clamping portions 122 are uniformly distributed along the circumferential direction of the wear-resisting plate 120, and during installation, the four clamping portions 122 are correspondingly arranged in the four grooves 1121. It will be appreciated that in other embodiments, the number of the snap-in portions 122 and the grooves 1121 may be set according to requirements, for example, three or five, so as to ensure the connection reliability and the movement stability of the wear plate 120.

FIG. 8 is a schematic sectional view at VIII-VIII in FIG. 4. Referring to fig. 1 to 8, in the present embodiment, the end cover 110 is provided with an oil inlet channel 113, the wear plate 120 is provided with an oil outlet 123, the oil inlet channel 113 is communicated with the oil outlet 123, and the lubricant entering the oil inlet channel 113 flows to the contact surface 121 through the oil outlet 123, that is, the oil outlet 123 is used for supplying oil to the contact surface 121, so as to reduce the wear of the contact surface 121. Specifically, the oil inlet channel 113 includes an oil inlet 1131, a flow space 1132 and a first communicating hole 1133 that communicate in sequence, and the oil inlet 1131 communicates with the oil outlet 123 in sequence through the flow space 1132 and the first communicating hole 1133.

The axial limiting structure 100 comprises a first part 154 and a second part 155 which are positioned at two sides of a preset plane 153, wherein the preset plane 153 is coincident with the axis of the axial limiting structure 100, that is, the axial limiting structure 100 is divided into two parts by the preset plane 153, and the two parts are respectively in a semicircular shape. The portion of the axial limiting structure 100 on one side of the predetermined plane 153 is a first portion 154, and the portion of the axial limiting structure 100 on the other side of the predetermined plane 153 is a second portion 155. The oil inlet hole 1131 is opened in the end cover 110 of the first portion 154, that is, the oil inlet hole 1131 is located in a portion of the end cover 110 belonging to the first portion 154. The oil outlet 123 opens into the wear plate 120 of the second portion 155, i.e. the oil outlet 123 is located in the portion of the wear plate 120 belonging to the second portion 155. The distance between the axis of the oil outlet hole 123 and the predetermined plane 153 is equal to the distance between the axis of the oil outlet hole 123 and the axis of the axial limiting structure 100, that is, the center of the oil outlet hole 123 is located in the middle along the circumferential direction of the axial limiting structure 100, in other words, on the plane shown in fig. 4, the line between the center of the oil outlet hole 123 and the center of the wear plate 120 is perpendicular to the predetermined plane 153.

When the axial limiting structure 100 is installed on the casing 210 and the oil outlet 123 is located at the lowest point of the circumference of the axial limiting structure, the preset plane 153 is the horizontal plane where the axis of the axial limiting structure 100 is located, because the oil outlet 123 and the oil inlet 1131 are located at two sides of the preset plane 153 respectively, the oil inlet 1131 is located at the upper half portion of the axial limiting structure 100, so that the lubricating oil can enter the oil inlet 1131 and flow to the oil outlet 123. Specifically, the oil inlet 1131 is located at a position corresponding to a gear engagement position in the gear assembly, so that the lubricating oil enters the oil inlet 1131 through the gear engagement.

Referring to fig. 2, fig. 3, fig. 5 and fig. 8, in the present embodiment, the oil inlet 1131 and the first communicating hole 1133 are both disposed on the cover 112, the first communicating hole 1133 is disposed coaxially with the cover 112, and the oil inlet 1131 and the first communicating hole 1133 are communicated through the flow space 1132. Specifically, a cavity communicating with the oil inlet 1131 and the first communication hole 1133 is disposed on a side of the cover 112 away from the wear plate 120, that is, the cavity and the second mounting groove 1123 are disposed on two sides of the cover 112 along the axial direction. Meanwhile, the cavity may be regarded as a recessed shape of an end surface of the cover body 112 away from the cover body 112, that is, a side of the cavity away from the wear plate 120 has an opening, which is a third opening. The end cap 110 further includes a cover plate 115, and the cover plate 115 is fixedly attached to a side of the cover body 112 facing away from the wear plate 120 such that the third opening is closed by the cover plate 115 to form a flow space 1132 within the end cap 110. Optionally, the number of the oil inlets 1131 is two, the two oil inlets 1131 are arranged at intervals along the circumferential direction of the cover 112, the cavity is simultaneously communicated with the two oil inlets 1131 and the first connecting hole 1133, and the cavity is approximately fan-shaped.

Referring to fig. 1 to 8, in the present embodiment, the axial limiting structure 100 further includes a return rod 140. The return rod 140 extends through the first communication hole 1133, and the return rod 140 is coupled to the wear plate 120. When the gear shaft 220 moves in a predetermined direction, that is, the gear shaft 220 axially moves, the return rod 140 slides in the predetermined direction with respect to the end cover 110, thereby opening or closing the first communication hole 1133. Specifically, when the gear shaft 220 moves in a direction close to the end cover 110 along the predetermined direction, the return rod 140 moves in the same direction as the gear shaft 220 under the action of the gear shaft 220, so as to open the first through hole 1133; when the gear shaft 220 moves in a direction away from the end cover 110 along the preset direction, the wear plate 120 moves in a direction away from the end cover 110 under the action of the elastic member 130, and the return rod 140 moves under the driving of the wear plate 120, so that the first connecting hole 1133 is closed, the self-lubrication of the axial limiting structure 100 is realized, and the lubrication effect is good.

Further, one end of the return rod 140, which is far away from the wear plate 120, is provided with a limiting protrusion 141, the size of the limiting protrusion 141 is larger than the radial size of the first communication hole 1133, and when the limiting protrusion 141 abuts against the end cover 110, the limiting protrusion 141 closes the opening of the first communication hole 1133, which is far away from the wear plate 120, so that the first communication hole 1133 is closed. When the returning rod 140 moves relative to the end cover 110 to separate the limiting protrusion 141 from the end cover 110, i.e. a gap is formed between the end surface of the limiting protrusion 141 and the end cover 110, the first connecting hole 1133 is opened. Specifically, the limit protrusion 141 is an annular protrusion formed by radially outwardly protruding the circumferential surface of one end of the return rod 140. The first accommodating groove 1122 is formed in one end, away from the wear plate 120, of the cover body 112, the limiting protrusion 141 is movably disposed in the first accommodating groove 1122, and when the limiting protrusion 141 abuts against the groove bottom of the first accommodating groove 1122, the first communication hole 1133 is closed; when the limiting protrusion 141 is separated from the bottom of the first receiving groove 1122, the first connecting hole 1133 is opened, and the flowing space 1132 is communicated with the oil outlet 123.

It should be noted that, in this embodiment, the repositioning rod 140 realizes opening and closing of the first through hole 1133 by providing the limiting protrusion 141, it can be understood that, in other embodiments, other manners may also be adopted according to requirements, for example, a frustum is provided at one end of the repositioning rod 140, a tapered hole matched with the frustum is provided at the first through hole 1133, when the frustum is attached to the wall surface of the tapered hole, the first through hole 1133 is closed, and when the frustum is separated from the wall surface of the tapered hole, the first through hole 1133 is opened.

Further, the axial limiting structure 100 further comprises a first sealing element 151, the first sealing element 151 is arranged between the limiting protrusion 141 and the end cover 110, when the limiting protrusion 141 abuts against the end cover 110 through the first sealing element 151, that is, the limiting protrusion 141 presses the first sealing element 151 against the end cover 110, the first communication hole 1133 is closed, and due to the arrangement of the first sealing element 151, a gap between the limiting protrusion 141 and the end cover 110 is sealed, so that a sealing effect is ensured. Specifically, the first seal 151 is an annular seal. The first sealing element 151 is sleeved on the return rod 140 and located at one end of the limiting protrusion 141 close to the wear plate 120, and when the limiting protrusion 141 moves towards the end close to the wear plate 120 along with the return rod 140, the limiting protrusion 141 presses the first sealing element 151 against the bottom of the first receiving groove 1122.

FIG. 9 is an enlarged view of a portion of the structure at IX in FIG. 5. Referring to fig. 4, fig. 8 and fig. 9, in the present embodiment, the contact surface 121 is provided with the lubricating oil path 124 communicated with the oil outlet 123, so that the lubricating oil flowing out from the oil outlet 123 enters the lubricating oil path 124 and flows on the contact surface 121 along the lubricating oil path 124, thereby achieving lubrication of the contact surface 121, and the lubricating effect is better. Specifically, the lubricating oil path 124 is a groove formed on the contact surface 121.

Further, the lubricating oil passage 124 includes a first lubricating oil passage 1241 and a second lubricating oil passage 1242 that communicate with each other. First lubrication oil duct 1241 extends along the circumference of wear-resisting plate 120, and first lubrication oil duct 1241 extends along the radial of wear-resisting plate 120, and first lubrication oil duct 1241, second lubrication oil duct 1242 and oil outlet 123 communicate each other, and consequently the lubricating oil that flows out from oil outlet 123 flows along first lubrication oil duct 1241 and second lubrication oil duct 1242 to satisfy the lubricated demand of whole circular contact surface 121. Specifically, the first lubricating oil passage 1241 is an annular groove extending along the circumferential direction of the wear plate 120, the annular groove is coaxially disposed with the wear plate 120, and the oil outlet 123 is formed in the annular groove, so that the oil outlet 123 is communicated with the first lubricating oil passage 1241. Second lubricating oil passage 1242 is disposed in first lubricating oil passage 1241, and second lubricating oil passage 1242 is a linear groove extending radially outward from the center of contact surface 121 until communicating with first lubricating oil passage 1241, that is, second lubricating oil passage 1242 communicates with oil outlet 123 through first lubricating oil passage 1241.

Optionally, the number of the second lubricating oil passages 1242 is three, and three second lubricating oil passages 1242 are arrayed around the axial circumference of the wear plate 120, that is, the three second lubricating oil passages 1242 intersect at the center of the wear plate 120. It is understood that the number of the second lubricating oil passages 1242 is not limited herein, and in other embodiments, the number of the second lubricating oil passages 1242, for example, two or four, etc., may be specifically set according to requirements.

Referring to fig. 5 and 8, in the present embodiment, a oil storage chamber 156 is formed between the end cover 110 and the wear plate 120, and the oil inlet passage 113 is communicated with the oil outlet 123 through the oil storage chamber 156. Specifically, since the wear plate 120 can slide relative to the cover 112, when the snap portion 122 of the wear plate 120 abuts against the pressing plate 111, a gap is formed between the wear plate 120 and the cover 112 along a predetermined direction, which is the oil storage chamber 156. The oil outlet 123 is communicated with the oil storage chamber 156, and meanwhile, the first communication hole 1133 of the oil inlet channel 113 is also communicated with the oil storage chamber 156, that is, the oil outlet 123 is communicated with the first communication hole 1133 through the oil storage chamber 156, the lubricating oil entering the oil inlet channel 113 from the oil inlet 1131 flows down to the first communication hole 1133 along the flow space 1132, flows into the oil storage chamber 156 through the first communication hole 1133, continues to flow down, and finally flows into the lubricating oil passage 124 through the oil outlet 123, so as to lubricate the contact surface 121.

The wear plate 120 is provided with a second communication hole 125, and the second communication hole 125 is simultaneously communicated with the lubricating oil path 124 and the oil storage chamber 156, so that the lubricating oil lubricated on the contact surface 121 can flow back to the oil storage chamber 156 through the second communication hole 125, thereby realizing circulating lubrication. Specifically, the second communication hole 125 is formed in the center of the wear plate 120, the second communication hole 125 is disposed coaxially with the wear plate 120, that is, the second communication hole 125 is formed at the intersection of three second lubricant passages 1242, lubricant flowing out from the oil outlet 123 first lubricates the contact surface 121 along the first lubricant passage 1241, when the lubricant in the first lubricant passage 1241 flows to the communication between the first lubricant passage 1241 and the second lubricant passage 1242, at least a part of the lubricant enters the second lubricant passage 1242 and lubricates the contact surface 121 in the radial direction along the second lubricant passage 1242, and the lubricant in the second lubricant passage 1242 flows to the second communication hole 125 along the second lubricant passage 1242, that is, the lubricant flowing to the second communication hole 125 at this time is a part which is redundant for completing lubrication, and returns to the oil storage chamber 156 through the second communication hole 125, so as to realize circulation.

Further, the first communication hole 1133 and the second communication hole 125 are coaxially disposed, and the return rod 140 penetrates the first communication hole 1133 and the second communication hole 125. Meanwhile, the axial limiting structure 100 further includes a limiting pin 142. The wear plate 120 is further provided with a second receiving groove 126, the second receiving groove 126 is located on the contact surface 121, and the second receiving groove 126 is coaxially arranged with the second communication hole 125, in other words, the second receiving groove 126 can be regarded as a large-aperture section formed by extending radially outward from an end wall surface of the second communication hole 125 close to the contact surface 121. During installation, the returning rod 140 penetrates through the first through hole 1133 and extends into the second through hole 125, the end of the returning rod 140 extends out of the second accommodating groove 126, then the limit pin 142 is installed on the returning rod 140, the limit pin 142 is accommodated in the second accommodating groove 126, and the limit pin 142 abuts against the groove bottom of the second accommodating groove 126. When the oil-saving cover is used, when the gear shaft 220 axially moves in a direction close to the end cover 110, the end surface 221 of the gear shaft 220 abuts against the contact surface 121, so that the wear-resisting plate 120 is pushed to move in the direction close to the end cover 110, meanwhile, the end surface 221 of the gear shaft 220 abuts against the end surface 221 of the return rod 140, the return rod 140 is pushed to synchronously move, so that the limiting protrusion 141 of the return rod 140 is separated from the cover body 112, the first communication hole 1133 is opened, lubricating oil enters the oil storage cavity 156 from the first communication hole 1133 and flows into the lubricating oil passage 124 through the oil storage cavity 156 and the oil outlet 123, and lubrication on the contact surface 121 is realized; when the gear shaft 220 moves away from the end cover 110, the axial force applied by the gear shaft 220 to the wear plate 120 and the return rod 140 disappears, the wear plate 120 moves away from the end cover 110 under the action of the elastic member 130, and the return rod 140 is moved synchronously due to the interference of the wear plate 120 and the limit pin 142, so that the limit protrusion 141 presses the first sealing element 151, and the first communication hole 1133 is closed.

It should be noted that the way of limiting the wear plate 120 by the return rod 140 is not limited herein, and it should be understood that in other embodiments, other ways may be adopted according to the requirement, for example, a nut may be disposed on the return rod 140.

Alternatively, when the snap-in portion 122 of the wear plate 120 abuts against the pressure plate 111, as shown in fig. 5 and 8, the end surface of the return rod 140 far from the end of the limit protrusion 141 is flush with the contact surface 121, that is, when the gear shaft 220 moves axially in a direction close to the end cap 110, the gear shaft 220 applies an axial force to both the wear plate 120 and the return rod 140. Specifically, the depth of the second receiving groove 126 is a, and the distance between the clamping portion 122 and the bottom of the groove 1121 is B, where B > a in order to meet the installation requirement of the limit pin 142. Meanwhile, the distance between the limiting protrusion 141 and the cover plate 115 is C, and C > B in order to meet the stroke requirement of the return rod 140.

Further, the axial stop arrangement 100 also includes a second seal 152, the second seal 152 being disposed between the wear plate 120 and the end cap 110 such that the oil reservoir 156 is sealed by the second seal 152. Specifically, the second sealing element 152 is a sealing ring. A second seal 152 is provided between the circumferential surface of the wear plate 120 and the cover 112 to effect a seal against the reservoir 156.

According to the axial limiting structure 100 provided by the embodiment, the working principle of the axial limiting structure 100 is as follows:

when in use, the axial limiting structure 100 is installed on the casing 210, and the axial limiting structure 100 is located at one axial end of the gear shaft 220. When the gear shaft 220 axially moves in a direction close to the end cover 110, the end surface 221 of the gear shaft 220 abuts against the contact surface 121, so that an axial force is applied to the wear plate 120 and the return rod 140, the elastic member 130 is compressed under the action of the axial force, so that the axial impact on the wear plate 120 is reduced, the wear plate 120 and the return rod 140 synchronously move, the limiting protrusion 141 of the return rod 140 is separated from the cover body 112, so that the first communication hole 1133 is opened, lubricating oil enters the oil storage chamber 156 from the flow space 1132 and flows into the lubricating oil passage 124 through the oil outlet 123, the contact surface 121 is lubricated, self-lubrication is realized, and redundant lubricating oil in the lubricating oil passage 124 flows back to the oil storage chamber 156 through the second communication hole 125, so that circulation is realized; when the gear shaft 220 moves away from the end cover 110, the axial force applied by the gear shaft 220 to the wear plate 120 and the return rod 140 disappears, the wear plate 120 moves away from the end cover 110 under the elastic force of the elastic member 130, and simultaneously the return rod 140 is driven by the limit pin 142 to move synchronously with the wear plate 120, and the limit protrusion 141 of the return rod 140 presses the first sealing member 151 in the first receiving groove 1122, so that the first communication hole 1133 is closed.

The axial limiting structure 100 provided by the embodiment at least has the following advantages:

according to the axial limiting structure 100 provided by the embodiment of the invention, the elastic piece 130 is arranged to absorb the axial force applied to the axial limiting structure 100 by the axial movement of the gear shaft 220, so that the axial impact of the gear shaft 220 on the axial limiting structure 100 is reduced, the damage to the axial limiting structure 100 is reduced, and the service life is prolonged. Be provided with oil feed passageway 113 in the axial limit structure 100, collect the lubricating oil of gear engagement splash through oil feed passageway 113 to be used for lubricated antifriction plate 120's contact surface 121 with this lubricating oil, lubricated effectual, further reduced antifriction plate 120's damage, axial limit structure 100's return rod 140 can move thereupon according to the axial motion of gear shaft 220 simultaneously, and realize the break-make of oil feed passageway 113 and oil outlet 123, realized the self-lubrication. Moreover, because the elastic member 130 is arranged in the axial limiting structure 100 provided by the embodiment of the invention, the end surface 221 of the gear shaft 220 can be directly arranged as the extrusion contact surface 121 without reserving an axial gap during installation, the temperature rise expansion of the gear shaft 220 can be automatically adjusted through the elastic member 130, and the use effect is good.

The present embodiment also provides a gearbox 10 that includes the axial stop arrangement 100 described above. Because the gear box 10 comprises the axial limiting structure 100, the gear box has the advantages of small axial impact, long service life and good lubricating effect.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The utility model provides an axial limit structure for with gear drive cooperation, gear drive includes gear shaft and casing, its characterized in that, axial limit structure include the end cover and connect in the elastic component of end cover, the end cover be used for with casing fixed connection, the elastic component is kept away from the one end of end cover is used for acting on the terminal surface of gear shaft, works as the gear axial is close to when the direction of end cover moves, the elastic component is used for right the gear shaft is applyed to the elastic force of keeping away from the direction motion of end cover, with right the gear shaft is followed the axial of gear shaft is carried on spacingly.

2. The axial limit structure of claim 1, further comprising a wear plate, wherein the elastic member is disposed between the wear plate and the end cover, the elastic member and the wear plate are sequentially disposed along a predetermined direction, and an end of the wear plate away from the end cover has a contact surface for contacting with the end surface of the gear shaft, so that the elastic member acts on the end surface of the gear shaft.

3. The axial limiting structure of claim 2, wherein the end cover is provided with a clamping groove, the wear-resisting plate is provided with a clamping portion, and the clamping portion is clamped in the clamping groove so that the wear-resisting plate is connected with the end cover;

4. The axial limiting structure of claim 3, wherein the clamping groove has two opposite end surfaces along the circumferential direction of the end cover, and the two end surfaces are respectively used for limiting the clamping portion so as to prevent the wear-resisting plate from rotating relative to the end cover.

5. The axial restraining structure of claim 3, wherein said end cap includes a cover and a pressure plate; a groove is formed in the cover body, and an opening is formed in one end, close to the wear-resisting plate, of the groove along the preset direction; the pressing plate is fixedly connected with the cover body, and the pressing plate covers the opening to form the clamping groove.

6. The axial limiting structure of claim 2, wherein the end cover is provided with an oil inlet channel, the wear plate is provided with an oil outlet, the oil inlet channel is communicated with the oil outlet, and the oil outlet is used for supplying oil to the contact surface.

7. The axial limiting structure of claim 6, wherein the oil inlet channel comprises an oil inlet hole, a flow space and a first communication hole which are sequentially communicated, and the first communication hole is communicated with the oil outlet hole.

8. The axial stop structure according to claim 7, wherein the axial stop structure comprises a first portion and a second portion located on either side of a predetermined plane, and the predetermined plane coincides with an axis of the axial stop structure; the oil inlet hole is formed in the end cover of the first portion, the oil outlet hole is formed in the wear-resisting plate of the second portion, and the distance between the axis of the oil outlet hole and the preset plane is equal to the distance between the axis of the oil outlet hole and the axis of the axial limiting structure.

9. The axial stop structure of claim 7, further comprising a return rod extending through the first communication hole and coupled to the wear plate; the return rod is in sliding fit with the end cover, and when the gear shaft moves in the preset direction, the return rod slides relative to the end cover in the preset direction so as to open or close the first communication hole.

10. The axial limit structure of claim 9, wherein a limit protrusion is arranged at one end of the return rod away from the wear plate, and the size of the limit protrusion is larger than the radial size of the first communication hole; when the limiting bulge abuts against the end cover, the limiting bulge seals the first communicating hole so as to close the first communicating hole; when the limiting protrusion is separated from the end cover, the first communicating hole is opened.

11. The axial stop structure of claim 10, further comprising a first seal member positioned between the stop protrusion and the end cap, the first communication hole being closed when the stop protrusion abuts the end cap through the first seal member.

12. The axial restraining structure of claim 6, wherein said contact surface is provided with a lubrication passage communicating with said oil outlet.

13. The axial limit structure of claim 12, wherein the lubrication passage comprises a first lubrication passage extending in a circumferential direction of the wear plate and a second lubrication passage extending in a radial direction of the wear plate, and the first lubrication passage, the second lubrication passage and the oil outlet hole are communicated with each other.

14. The axial limiting structure of claim 12 wherein an oil storage chamber is formed between the end cover and the wear plate, and the oil inlet passage communicates with the oil outlet through the oil storage chamber; and a second communication hole is formed in the wear-resisting plate and is simultaneously communicated with the lubricating oil way and the oil storage cavity, so that redundant lubricating oil after the contact surface is lubricated can flow back to the oil storage cavity through the second communication hole.

15. A gearbox comprising an axial stop arrangement according to any of claims 1 to 14.