An axial limiting structure and a gearbox

Abstract

The embodiments of the present invention provide an axial limiting structure and a gear box, and relate to the technical field of limiting structures. The axial limiting structure provided by the embodiments of the present invention includes an end cover and an elastic member connected to the end cover, the end cover is used to be fixedly connected to the housing, and the end of the elastic member away from the end cover is used to act on the end face of the gear shaft, when the gear shaft moves in a direction close to the end cover, the elastic member is used to apply an elastic force to the gear shaft to move away from the end cover, thereby limiting the gear shaft along the axial direction of the gear shaft, because the axial limiting structure realizes the axial limiting of the gear shaft through the elastic force, through the buffering effect of the elastic member, it can effectively reduce the axial impact of the gear shaft on the axial limiting structure, thereby helping to extend the service life of the axial limiting structure.

Description

Technical Field

[0001] The present invention relates to the technical field of limiting structures, and in particular to an axial limiting structure and a gear box. Background Art

[0002] Gear transmission is a commonly used transmission device, such as the wheel reducer of automobiles. In order to prevent temperature expansion, a certain axial gap is left between the shaft end of the gear shaft of the gear transmission and the housing, and an axial limit structure is set on the housing to prevent the gear shaft from axial movement.

[0003] However, when the existing axial limiting structure prevents the gear shaft from axial movement, an axial impact will occur between the gear shaft and the axial limiting structure, resulting in a short service life. At the same time, the wear of the axial limiting structure causes an increase in the axial clearance, which is not conducive to the use of the gear transmission device. Summary of the invention

[0004] The objects of the present invention include, for example, providing an axial limiting structure which can effectively reduce the axial impact between the gear shaft and the gear shaft and has a long service life.

[0005] The purpose of the present invention also includes providing a gear box, which can effectively reduce the axial impact between the axial limiting structure and the gear shaft and has a long service life.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] An embodiment of the present invention provides an axial limiting structure for cooperating with a gear transmission device, the gear transmission device comprising a gear shaft and a housing, the axial limiting structure comprising an end cover and an elastic member connected to the end cover, the end cover being used to be fixedly connected to the housing, the end of the elastic member away from the end cover being used to act on the end face of the gear shaft, when the gear shaft moves in a direction close to the end cover, the elastic member is used to apply an elastic force to the gear shaft moving in a direction away from the end cover, so as to limit the gear shaft along the axial direction of the gear shaft. Thereby reducing the axial impact of the gear shaft on the axial limiting structure.

[0008] Optionally, the axial limiting structure further includes a wear-resistant plate, the elastic member is arranged between the wear-resistant plate and the end cover, and the end cover, the elastic member and the wear-resistant plate are arranged in sequence along a preset direction, and the end of the wear-resistant plate away from the end cover has a contact surface, and the contact surface is used to contact the end face of the gear shaft so that the elastic member acts on the end face of the gear shaft. The wear-resistant plate contacts the end face of the gear shaft, thereby reducing the wear caused by the rotation of the gear shaft relative to the axial limiting structure.

[0009] Optionally, the end cover has a clamping groove, the wear-resistant plate has a clamping portion, and the clamping portion is clamped in the clamping groove to connect the wear-resistant plate to the end cover;

[0010] Wherein, the dimension of the clamping groove in the preset direction is greater than the dimension of the clamping portion in the preset direction, so that the wear-resistant plate can move relative to the end cover along the preset direction.

[0011] Optionally, along the circumference of the end cover, the clamping groove has two opposite end surfaces, and the two end surfaces are respectively used to limit the clamping portion to prevent the wear-resistant plate from rotating relative to the end cover.

[0012] Optionally, the end cover includes a cover body and a pressure plate; a groove is provided on the cover body, and along the preset direction, the groove has an opening at one end close to the wear-resistant plate; the pressure plate is fixedly connected to the cover body, and the pressure plate blocks the opening to form the snap-in groove.

[0013] Optionally, an oil inlet channel is provided on the end cover, an oil outlet hole is provided on the wear-resistant plate, the oil inlet channel is connected to the oil outlet hole, and the oil outlet hole is used to supply oil to the contact surface. Increasing the lubrication of the contact surface helps to further reduce wear.

[0014] Optionally, the oil inlet channel includes an oil inlet hole, a flow space and a first connecting hole which are connected in sequence, and the first connecting hole is connected to the oil outlet hole.

[0015] Optionally, the axial limiting structure includes a first part and a second part located on both sides of a preset plane, and the preset plane coincides with the axis of the axial limiting structure; the oil inlet hole is opened in the end cover of the first part, the oil outlet hole is opened in the wear-resistant plate of the second part, 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.

[0016] Optionally, the axial limiting structure further includes a return rod, the return rod passes through the first connecting hole and is connected to the wear-resistant plate; the return rod is slidably matched with the end cover, and when the gear shaft moves along the preset direction, the return rod slides relative to the end cover along the preset direction to open or close the first connecting hole, thereby achieving self-lubrication of the axial limiting structure according to the axial movement of the gear shaft.

[0017] Optionally, a limiting protrusion is provided at one end of the return rod away from the wear-resistant plate, and the size of the limiting protrusion is larger than the radial size of the first connecting hole; when the limiting protrusion abuts against the end cover, the limiting protrusion closes the first connecting hole to close the first connecting hole; when the limiting protrusion is detached from the end cover, the first connecting hole is opened.

[0018] Optionally, the axial limiting structure further includes a first sealing member, wherein the first sealing member is located between the limiting protrusion and the end cover, and when the limiting protrusion abuts against the end cover through the first sealing member, the first connecting hole is closed.

[0019] Optionally, a lubricating oil passage connected to the oil outlet hole is provided on the contact surface.

[0020] Optionally, the lubricating oil circuit includes a first lubricating oil channel extending along the circumference of the wear-resistant plate and a second lubricating oil channel extending along the radial direction of the wear-resistant plate, and the first lubricating oil channel, the second lubricating oil channel and the oil outlet hole are interconnected.

[0021] Optionally, an oil storage cavity is formed between the end cover and the wear-resistant plate, and the oil inlet channel is connected to the oil outlet hole through the oil storage cavity; the wear-resistant plate is also provided with a second connecting hole, which is connected to the lubricating oil circuit and the oil storage cavity at the same time, so that excess lubricating oil after lubricating the contact surface can flow back to the oil storage cavity through the second connecting hole to achieve circulating lubrication.

[0022] An embodiment of the present invention further provides a gear box. The gear box includes an axial limiting structure, which is used to cooperate with a gear transmission device, the gear transmission device includes a gear shaft and a housing, the axial limiting structure includes an end cover and an elastic member connected to the end cover, the end cover is used to be fixedly connected to the housing, and the end of the elastic member away from the end cover is used to act on the end face of the gear shaft. When the gear shaft moves in a direction close to the end cover, the elastic member is used to apply an elastic force to the gear shaft to move in a direction away from the end cover, so as to limit the gear shaft along the axial direction of the gear shaft.

[0023] The beneficial effects of the axial limiting structure and the gear box of the embodiment of the present invention include, for example:

[0024] An embodiment of the present invention provides an axial limiting structure, which is used to cooperate with a gear transmission device. The gear transmission device includes a gear shaft and a housing. The axial limiting structure includes an end cover and an elastic member connected to the end cover, the end cover is used to be fixedly connected to the housing, and the end of the elastic member away from the end cover is used to act on the end face of the gear shaft. When the gear shaft moves in a direction close to the end cover, the elastic member is used to apply an elastic force to the gear shaft to move away from the end cover, thereby limiting the gear shaft along the axial direction of the gear shaft. Since the axial limiting structure achieves axial limiting of the gear shaft through elastic force, the axial impact of the gear shaft on the axial limiting structure can be effectively reduced through the buffering effect of the elastic member, thereby helping to extend the service life of the axial limiting structure.

[0025] An embodiment of the present invention further provides a gear box, which includes the above-mentioned axial limiting structure and gear transmission device, and thus also has the beneficial effects of small axial impact and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic cross-sectional view of a partial structure of a gearbox provided in an embodiment of the present invention;

[0028] Figure 2 An exploded view of the axial limiting structure provided by an embodiment of the present invention at a first viewing angle;

[0029] Figure 3 An exploded view of the axial limiting structure provided by an embodiment of the present invention at a second viewing angle;

[0030] Figure 4 A schematic diagram of the overall structure of the axial limiting structure provided by an embodiment of the present invention;

[0031] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at Ⅴ-Ⅴ in the middle;

[0032] Figure 6 A schematic diagram of the structure of a wear-resistant plate in an axial limiting structure provided in an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the partial structure of an end cover in the axial limiting structure provided in an embodiment of the present invention;

[0034] Figure 8 for Figure 4 Schematic diagram of the cross-sectional structure at Ⅷ-Ⅷ in the middle;

[0035] Fig. 9 for Figure 5 Enlarged schematic diagram of the local structure at point IX.

[0036] Icons: 10-gearbox; 100-axial limiting structure; 110-end cover; 111-pressing plate; 112-cover body; 1121-groove; 1122-first receiving groove; 1123-second mounting groove; 113-oil inlet channel; 1131-oil inlet hole; 1132-flow space; 1133-first connecting hole; 114-clamping groove; 115-cover plate; 116-locking bolt; 117-connecting flange; 120-wear-resistant plate; 121-contact surface; 122-clamping part; 123-oil outlet hole; 124-lubricating oil circuit; 1241-first lubricating oil channel; 1242-second lubricating oil channel; 125-second connecting hole; 126-second accommodating groove; 127-first mounting groove; 130-elastic member; 140-return rod; 141-limiting protrusion; 142-limiting pin; 151-first sealing member; 152-second sealing member; 153-preset plane; 154-first part; 155-second part; 156-oil storage chamber; 210-housing; 220-gear shaft; 221-end face. DETAILED DESCRIPTION

[0037] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0042] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0043] Figure 1 This is a schematic cross-sectional view of a partial structure of the gearbox 10 provided in this embodiment. Figure 2 An exploded view of the axial limiting structure 100 provided in this embodiment at a first viewing angle, Figure 3 This is an exploded view of the axial limiting structure 100 provided in this embodiment at a second viewing angle. Figure 1-Figure 3 , this embodiment provides an axial limiting structure 100 , and correspondingly, this embodiment provides a gear box 10 .

[0044] The gearbox 10 includes an axial limiting structure 100, and the gearbox 10 also includes a gear transmission device. The gear transmission device includes a housing 210 and a gear shaft 220, and the gear shaft 220 is rotatably arranged in the housing 210. The axial limiting structure 100 is installed on the housing 210, and the axial limiting structure 100 is located on one side of the axial direction of the gear shaft 220, so that when the gear shaft 220 moves axially, the gear shaft 220 is axially limited by the axial limiting structure 100. Optionally, the gear shaft 220 is a sun gear, and the gear transmission device is a planetary transmission device.

[0045] The axial limiting structure 100 includes an end cover 110 and an elastic member 130 connected to the end cover 110. The end cover 110 is used to be fixedly connected to the casing 210. The end of the elastic member 130 away from the end cover 110 is used to act on the end face 221 of the gear shaft 220. When the gear shaft 220 moves in a direction close to the end cover 110, the elastic member 130 is used to apply an elastic force to the gear shaft 220 to move in a direction away from the end cover 110, thereby limiting the gear shaft 220 along the axial direction of the gear shaft 220. Since the axial limiting structure 100 achieves axial limiting of the gear shaft 220 through elastic force, the buffering effect of the elastic member 130 can effectively reduce the axial impact of the gear shaft 220 on the axial limiting structure 100, thereby helping to extend the service life of the axial limiting structure 100.

[0046] The axial limiting structure 100 provided in this embodiment is further described below:

[0047] Figure 4 The overall structural diagram of the axial limiting structure 100 provided in this embodiment is as follows: Figure 5 for Figure 4 The cross-sectional structure diagram at Ⅴ-Ⅴ in the middle. Please refer to Figure 1-Figure 5 In this embodiment, the axial limiting structure 100 further includes a wear-resistant plate 120, and the elastic member 130 is arranged between the wear-resistant plate 120 and the end cover 110, that is, the end cover 110, the elastic member 130 and the wear-resistant plate 120 are arranged in sequence along the preset direction. Since the axial limiting structure 100 is used to limit the gear shaft 220 along the axial direction of the gear shaft 220 itself, and the elastic member 130 is used to apply 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 installed in the gear transmission device, the preset direction of the axial limiting structure 100 is the axial direction of the gear shaft 220. The end of the wear-resistant plate 120 away from the end cover 110 has a contact surface 121, and the contact surface 121 is used to contact the end surface 221 of the gear shaft 220, so that the elastic member 130 acts on the end surface 221 of the gear shaft 220 through the wear-resistant plate 120. Further, the surface of the contact surface 121 is hardened to reduce wear.

[0048] Figure 6 This is a schematic structural diagram of the wear-resistant plate 120 in the axial limiting structure 100 provided in this embodiment. Figure 7 This is a partial structural diagram of the end cover 110 in the axial limiting structure 100 provided in this embodiment. Figure 1-Figure 7 In this embodiment, the wear-resistant plate 120 and the end cover 110 are both roughly circular, and at the same time, the wear-resistant plate 120 and the end cover 110 are coaxially arranged, and the preset direction can be regarded as the axial direction of the wear-resistant plate 120 and the end cover 110. A connecting flange 117 is arranged on the outer periphery of the end cover 110, and a plurality of mounting holes are opened on the connecting flange 117. Bolts pass through the mounting holes and are screwed to the housing 210, so that the end cover 110 is fixedly connected to the housing 210.

[0049] A first mounting groove 127 is provided on the wear-resistant plate 120, and a second mounting groove 1123 is provided on the end cover 110. The first mounting groove 127 and the second mounting groove 1123 are arranged opposite to each other, and both ends of the elastic member 130 are respectively arranged in the first mounting groove 127 and the second mounting groove 1123, so as to realize the installation of the elastic member 130 and fix the position of the elastic member 130. Optionally, the elastic member 130 is a spring. It is understandable that in other embodiments, the type of the elastic member 130 can also be set according to requirements, such as an elastic rubber block.

[0050] In this embodiment, the number of elastic members 130 is four, and accordingly, the number of first mounting grooves 127 and second mounting grooves 1123 is also four, and the two ends of the four elastic members 130 are arranged in the four first mounting grooves 127 and the four second mounting grooves 1123 in a one-to-one correspondence. It can be understood that in other embodiments, the number of elastic members 130 can also be specifically set according to requirements, for example, the number of elastic members 130 is set to three, and accordingly, the number of first mounting grooves 127 and second mounting grooves 1123 is also set to three.

[0051] Please refer to Figure 5 , Figure 6 and Figure 7 In this embodiment, the end cover 110 has a snap-in groove 114 , and the wear-resistant plate 120 has a snap-in portion 122 . The snap-in portion 122 is snapped into the snap-in groove 114 , so that the wear-resistant plate 120 is connected to the end cover 110 . Moreover, since an elastic member 130 is arranged between the wear-resistant plate 120 and the end cover 110, the elastic force of the elastic member 130 buffers the axial impact of the gear shaft 220 on the wear-resistant plate 120. Therefore, the size of the clamping groove 114 in the preset direction is set to be larger than the size of the clamping portion 122 in the preset direction. That is, after the clamping portion 122 is clamped into the clamping groove 114, the clamping groove 114 still has a certain space in the preset direction so that the wear-resistant plate 120 can move relative to the end cover 110 along the preset direction. That is, when the gear shaft 220 moves axially, the wear-resistant plate 120 can move a certain distance in the direction close to the end cover 110. At this time, the elastic member 130 absorbs the axial force applied by the gear shaft 220 to the wear-resistant plate 120, thereby reducing the axial impact on the wear-resistant plate 120 and avoiding damage to the wear-resistant plate 120.

[0052] Specifically, the end cover 110 includes a cover body 112 and a pressing plate 111. The structure of the cover body 112 is as follows: Figure 7 As shown, a groove 1121 is provided on the cover body 112, and along a preset direction, one end of the groove 1121 close to the wear-resistant plate 120 has an opening, and the opening is a first opening. In other words, the groove 1121 can be regarded as a concave end surface of the cover body 112 close to one end of the wear-resistant plate 120 along the preset direction. The pressing plate 111 is fixedly connected to the cover body 112, so that the first opening is blocked by the pressing plate 111, that is, the first opening of the groove 1121 is closed by the pressing plate 111, thereby forming a clamping groove 114. The size of the clamping groove 114 in the preset direction is the groove depth of the groove 1121. At the same time, the clamping groove 114 has an opening facing inward along the radial direction of the cover body 112, and the opening is a second opening, and the clamping portion 122 of the wear-resistant plate 120 extends into the clamping groove 114 through the second opening.

[0053] When the gear shaft 220 does not move axially, the wear plate 120 has a tendency to move away from the end cover 110 under the action of the elastic member 130, and at this time, the clamping portion 122 abuts against the pressure plate 111 to limit the wear plate 120; when the gear shaft 220 moves axially in the direction of 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 of approaching the end cover 110 until the clamping portion 122 abuts against the bottom of the groove 1121. In other words, the clamping portion 122 can only move between the pressure plate 111 and the bottom of the groove 1121. Optionally, the end cover 110 also includes a locking bolt 116, and the locking bolt 116 is used to fix the pressure plate 111 to the cover body 112.

[0054] Furthermore, 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 to limit the clamping portion 122, that is, the clamping portion 122 is limited between the two end surfaces, so as to prevent the wear-resistant plate 120 from rotating relative to the end cover 110 around the axial direction of the end cover 110. Optionally, the groove 1121 is a semicircular groove, the axis of the groove 1121 is parallel to the axis of the end cover 110, and the two end surfaces of the clamping groove 114 along the circumference of the end cover 110 are the two wall surfaces of the groove 1121 along the circumference. Since the groove 1121 is a semicircular groove, the two wall surfaces are both in a quarter arc shape. The clamping portion 122 is a protrusion arranged on the outer periphery of the wear-resistant plate 120 and extending radially outward from the wear-resistant plate 120. Accordingly, the clamping portion 122 is a semicircular shape having the same shape as the groove 1121, so that when the clamping portion 122 is arranged in the groove 1121, the circumferential limit of the wear-resistant plate 120 is achieved through the cooperation between the clamping portion 122 and the groove 1121. It can be understood that in other embodiments, the shape of the groove 1121 can also be set according to requirements, such as a square shape. Accordingly, the clamping portion 122 is set to a square shape, and the circumferential movement of the wear-resistant plate 120 can be limited by the clamping of the clamping portion 122 and the groove 1121, and the clamping portion 122 can perform a certain range of axial movement in the groove 1121.

[0055] Optionally, the cover body 112 is provided with four grooves 1121, which are evenly distributed along the circumference of the cover body 112. Accordingly, the wear-resistant plate 120 is provided with four clamping parts 122, which are evenly distributed along the circumference of the wear-resistant plate 120. During installation, the four clamping parts 122 are arranged in four grooves 1121 in a one-to-one correspondence. It can be understood that in other embodiments, the number of clamping parts 122 and grooves 1121 can also be set according to requirements, for example, set to three or five, etc., as long as the connection reliability and movement stability of the wear-resistant plate 120 can be ensured.

[0056] Figure 8 for Figure 4 The cross-sectional structure diagram at Ⅷ-Ⅷ in the middle. Please refer to Figure 1-Figure 8 In this embodiment, an oil inlet channel 113 is provided on the end cover 110, and an oil outlet hole 123 is provided on the wear-resistant plate 120. The oil inlet channel 113 is connected to the oil outlet hole 123. The lubricating oil entering the oil inlet channel 113 flows to the contact surface 121 through the oil outlet hole 123, that is, the oil outlet hole 123 is used to supply oil to the contact surface 121, thereby reducing the wear of the contact surface 121. Specifically, the oil inlet channel 113 includes an oil inlet hole 1131, a flow space 1132, and a first connecting hole 1133 that are connected in sequence. The oil inlet hole 1131 is connected to the oil outlet hole 123 through the flow space 1132 and the first connecting hole 1133 in sequence.

[0057] The axial limiting structure 100 includes a first part 154 and a second part 155 located on both sides of a preset plane 153. The preset plane 153 coincides 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 semicircular. The part of the axial limiting structure 100 located on one side of the preset plane 153 is the first part 154, and the part of the axial limiting structure 100 located on the other side of the preset plane 153 is the second part 155. The oil inlet hole 1131 is opened in the end cover 110 of the first part 154, that is, the oil inlet hole 1131 is located in the part of the end cover 110 belonging to the first part 154. The oil outlet hole 123 is opened in the wear-resistant plate 120 of the second part 155, that is, the oil outlet hole 123 is located in the part of the wear-resistant plate 120 belonging to the second part 155. The distance between the axis of the oil outlet hole 123 and the preset 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, along the circumference of the axial limiting structure 100, the center of the oil outlet hole 123 is located in the middle. Figure 4 On the plane shown, the line connecting the center of the oil outlet hole 123 and the center of the wear-resistant plate 120 is perpendicular to the preset plane 153 .

[0058] When the axial limiting structure 100 is installed on the housing 210, and the position of the oil outlet hole 123 is set at the lowest point of the circumference thereof, the preset plane 153 is the horizontal plane where the axis of the axial limiting structure 100 is located. Since the oil outlet hole 123 and the oil inlet hole 1131 are respectively located on both sides of the preset plane 153, the oil inlet hole 1131 is located in the upper half of the axial limiting structure 100, which facilitates the lubricating oil to enter the oil inlet hole 1131 and flow to the oil outlet hole 123. Specifically, the position of the oil inlet hole 1131 corresponds to the gear meshing position in the gear transmission device, so that the lubricating oil enters the oil inlet hole 1131 through the gear meshing action.

[0059] Please refer to Figure 2 , Figure 3 , Figure 5 and Figure 8 In this embodiment, the oil inlet hole 1131 and the first connecting hole 1133 are both provided in the cover body 112, the first connecting hole 1133 is coaxially arranged with the cover body 112, and the oil inlet hole 1131 and the first connecting hole 1133 are connected through the flow space 1132. Specifically, a cavity connecting the oil inlet hole 1131 and the first connecting hole 1133 is provided on the side of the cover body 112 away from the wear-resistant plate 120, that is, the cavity and the second mounting groove 1123 are respectively located on both sides of the cover body 112 along the axial direction. At the same time, the cavity can be regarded as a concave molding of the end surface of the cover body 112 away from the cover body 112, that is, the side of the cavity away from the wear-resistant plate 120 has an opening, and the opening is the third opening. The end cover 110 also includes a cover plate 115, which is fixedly connected to the side of the cover body 112 away from the wear-resistant plate 120, so that the third opening is closed by the cover plate 115 to form a flow space 1132 located inside the end cover 110. Optionally, there are two oil inlet holes 1131 , which are spaced apart along the circumference of the cover body 112 , and the cavity is connected to the two oil inlet holes 1131 and the first connecting hole 1133 at the same time, and the cavity is roughly fan-shaped.

[0060] Please refer to Figure 1-Figure 8 In this embodiment, the axial limiting structure 100 further includes a return rod 140. The return rod 140 passes through the first connecting hole 1133, and the return rod 140 is connected to the wear-resistant plate 120. When the gear shaft 220 moves along a preset direction, that is, when the gear shaft 220 moves along its own axial direction, the return rod 140 slides relative to the end cover 110 along the preset direction, thereby opening or closing the first connecting hole 1133. Specifically, when the gear shaft 220 moves along the preset direction toward the end cover 110, the return rod 140 moves in the same direction as the gear shaft 220 under the action of the gear shaft 220, thereby opening the first connecting hole 1133; when the gear shaft 220 moves along the preset direction toward the direction away from the end cover 110, the wear-resistant plate 120 moves in the direction away from the end cover 110 under the action of the elastic member 130, and the return rod 140 moves accordingly under the drive of the wear-resistant plate 120, thereby closing the first connecting hole 1133, realizing self-lubrication of the axial limiting structure 100, and the lubrication effect is good.

[0061] Furthermore, a limiting protrusion 141 is provided at one end of the return rod 140 away from the wear-resistant plate 120, and the size of the limiting protrusion 141 is larger than the radial size of the first connecting hole 1133. When the limiting protrusion 141 abuts against the end cover 110, the limiting protrusion 141 closes the opening of the first connecting hole 1133 away from the wear-resistant plate 120, thereby closing the first connecting hole 1133. When the return rod 140 moves relative to the end cover 110, so that the limiting protrusion 141 is separated from the end cover 110, that is, 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 limiting protrusion 141 is an annular protrusion formed by the circumferential surface of one end of the return rod 140 protruding radially outward. A first receiving groove 1122 is provided at one end of the cover body 112 away from the wear-resistant plate 120, and a limiting protrusion 141 can be movably arranged in the first receiving groove 1122. When the limiting protrusion 141 is pressed against the bottom of the first receiving groove 1122, the first connecting hole 1133 is closed; when the limiting protrusion 141 is disengaged from the bottom of the first receiving groove 1122, the first connecting hole 1133 is opened, and the flow space 1132 is connected with the oil outlet hole 123.

[0062] It should be noted that, in the present embodiment, the return rod 140 realizes the opening and closing of the first connecting hole 1133 by setting a limiting protrusion 141. It can be understood that in other embodiments, other methods can be adopted as needed. For example, a frustum is set at one end of the return rod 140, and a conical hole matching the frustum is set in the first connecting hole 1133. When the frustum fits the wall of the conical hole, the first connecting hole 1133 is closed, and when the frustum is separated from the wall of the conical hole, the first connecting hole 1133 is opened.

[0063] Furthermore, the axial limiting structure 100 also includes a first sealing member 151, which is disposed 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 member 151, that is, the limiting protrusion 141 presses the first sealing member 151 against the end cover 110, the first connecting hole 1133 is closed, and due to the provision of the first sealing member 151, the gap between the limiting protrusion 141 and the end cover 110 is sealed, thereby ensuring the sealing effect. Specifically, the first sealing member 151 is an annular sealing gasket. The first sealing member 151 is sleeved on the return rod 140 and is located at one end of the limiting protrusion 141 close to the wear-resistant plate 120. When the limiting protrusion 141 moves with the return rod 140 toward the wear-resistant plate 120, the limiting protrusion 141 presses the first sealing member 151 against the bottom of the first accommodating groove 1122.

[0064] Fig. 9 for Figure 5 The enlarged schematic diagram of the local structure at Ⅸ in the middle. Please refer to Figure 4 , Figure 8 and Fig. 9In this embodiment, the contact surface 121 is provided with a lubricating oil passage 124 connected to the oil outlet hole 123, so that the lubricating oil flowing out of the oil outlet hole 123 enters the lubricating oil passage 124 and flows along the lubricating oil passage 124 on the contact surface 121, thereby achieving lubrication of the contact surface 121 and achieving a better lubrication effect. Specifically, the lubricating oil passage 124 is a groove opened on the contact surface 121.

[0065] Furthermore, the lubricating oil passage 124 includes a first lubricating oil passage 1241 and a second lubricating oil passage 1242 which are interconnected. The first lubricating oil passage 1241 extends along the circumference of the wear-resistant plate 120, and the first lubricating oil passage 1241 extends along the radial direction of the wear-resistant plate 120, and the first lubricating oil passage 1241, the second lubricating oil passage 1242 and the oil outlet hole 123 are interconnected, so the lubricating oil flowing out of the oil outlet hole 123 flows along the first lubricating oil passage 1241 and the second lubricating oil passage 1242, thereby meeting the lubrication requirements of the entire circular contact surface 121. Specifically, the first lubricating oil passage 1241 is an annular groove extending along the circumference of the wear-resistant plate 120, and the annular groove is coaxially arranged with the wear-resistant plate 120, and the oil outlet hole 123 is provided in the annular groove, so that the oil outlet hole 123 is connected with the first lubricating oil passage 1241. The second lubricating oil channel 1242 is arranged in the first lubricating oil channel 1241, and the second lubricating oil channel 1242 is a straight groove extending radially outward from the center of the contact surface 121 until it is connected with the first lubricating oil channel 1241, that is, the second lubricating oil channel 1242 is connected with the oil outlet 123 through the first lubricating oil channel 1241.

[0066] Optionally, the number of the second lubricating oil passages 1242 is three, and the three second lubricating oil passages 1242 are arranged in an axial circumferential array around the wear-resistant plate 120, that is, the three second lubricating oil passages 1242 intersect at the center of the wear-resistant plate 120. It can be understood that the number of the second lubricating oil passages 1242 is not limited here, and in other embodiments, the number of the second lubricating oil passages 1242 is also specifically set according to requirements, such as two or four.

[0067] Please refer to Figure 5 and Figure 8In this embodiment, an oil storage cavity 156 is formed between the end cover 110 and the wear plate 120, and the oil inlet channel 113 is connected to the oil outlet hole 123 through the oil storage cavity 156. Specifically, since the wear plate 120 can slide relative to the cover body 112, when the clamping portion 122 of the wear plate 120 contacts the pressing plate 111, a certain gap is formed between the wear plate 120 and the cover body 112 along a preset direction, and the gap is the oil storage cavity 156. The oil outlet hole 123 is connected to the oil storage chamber 156, and at the same time, the first connecting hole 1133 of the oil inlet channel 113 is also connected to the oil storage chamber 156, that is, the oil outlet hole 123 is connected to the first connecting hole 1133 through the oil storage chamber 156. The lubricating oil entering the oil inlet channel 113 from the oil inlet hole 1131 flows downward along the flow space 1132 to the first connecting hole 1133, flows into the oil storage chamber 156 through the first connecting hole 1133, continues to flow downward, and finally flows into the lubricating oil circuit 124 through the oil outlet hole 123, thereby lubricating the contact surface 121.

[0068] The wear-resistant plate 120 is provided with a second connecting hole 125 which is connected to the lubricating oil path 124 and the oil storage chamber 156 at the same time, so that the lubricating oil after lubricating the contact surface 121 can flow back to the oil storage chamber 156 through the second connecting hole 125 to achieve circulating lubrication. Specifically, the second connecting hole 125 is opened at the center of the wear-resistant plate 120, and the second connecting hole 125 is coaxially arranged with the wear-resistant plate 120, that is, the second connecting hole 125 is opened at the intersection of the three second lubricating oil passages 1242, and the lubricating oil flowing out from the oil outlet hole 123 firstly realizes the circumferential lubrication of the contact surface 121 along the first lubricating oil passage 1241, and when the lubricating oil in the first lubricating oil passage 1241 flows to the connecting point between the first lubricating oil passage 1241 and the second lubricating oil passage 1242, at least part of the lubricating oil enters the second lubricating oil passage 1242 and realizes the radial lubrication of the contact surface 121 along the second lubricating oil passage 1242, and the lubricating oil in the second lubricating oil passage 1242 flows to the second connecting hole 125 along the second lubricating oil passage 1242, that is, the lubricating oil flowing to the second connecting hole 125 at this time is to complete the lubrication of the excess part, and this part of the lubricating oil returns to the oil storage chamber 156 through the second connecting hole 125 to realize circulation.

[0069] Furthermore, the first connecting hole 1133 and the second connecting hole 125 are coaxially arranged, and the return rod 140 passes through the first connecting hole 1133 and the second connecting hole 125. At the same time, the axial limiting structure 100 also includes a limiting pin 142. A second receiving groove 126 is also arranged on the wear-resistant plate 120, and the second receiving groove 126 is located on the contact surface 121, and the second receiving groove 126 is coaxially arranged with the second connecting hole 125. In other words, the second receiving groove 126 can be regarded as a large-diameter section formed by extending radially outward from one end wall surface of the second connecting hole 125 close to the contact surface 121. During installation, the return rod 140 passes through the first connecting hole 1133 and extends into the second connecting hole 125, and the end of the return rod 140 extends from the second receiving groove 126, and then the limiting pin 142 is installed on the return rod 140, and the limiting pin 142 is accommodated in the second receiving groove 126, and the limiting pin 142 conflicts with the groove bottom of the second receiving groove 126. When in use, when the gear shaft 220 moves axially in the direction close to the end cover 110, the end face 221 of the gear shaft 220 contacts the contact surface 121, thereby pushing the wear-resistant plate 120 to move in the direction close to the end cover 110. At the same time, the end face 221 of the gear shaft 220 contacts the end face 221 of the return rod 140, pushing the return rod 140 to move synchronously, so that the limiting protrusion 141 of the return rod 140 is separated from the cover body 112, the first connecting hole 1133 is opened, and the lubricating oil enters the oil storage chamber 156 from the first connecting hole 1133 and passes through the oil storage chamber 156. The oil flows into the lubricating oil path 124 through the oil storage chamber 156 and the oil outlet hole 123 to lubricate the contact surface 121; when the gear shaft 220 moves in the direction away from the end cover 110, the axial force exerted by the gear shaft 220 on the wear-resistant plate 120 and the return rod 140 disappears, and the wear-resistant plate 120 moves in the direction away from the end cover 110 under the action of the elastic member 130. Due to the interference between the wear-resistant plate 120 and the limit pin 142, the return rod 140 is driven to move synchronously, so that the limit protrusion 141 presses the first sealing member 151, and the first connecting hole 1133 is closed.

[0070] It should be noted that the limiting method of the return rod 140 and the wear-resistant plate 120 is not limited here. It can be understood that in other embodiments, other methods can also be adopted according to needs, such as setting a nut on the return rod 140.

[0071] Optionally, when the clamping portion 122 of the wear-resistant plate 120 contacts the pressing plate 111, as shown in FIG. Figure 5 and 8As shown, the end face of the return rod 140 away from the limiting protrusion 141 is flush with the contact surface 121, that is, when the gear shaft 220 moves axially in the direction close to the end cover 110, the gear shaft 220 simultaneously applies axial force to the wear-resistant plate 120 and the return rod 140. Specifically, the groove depth of the second accommodating groove 126 is A, and the distance between the clamping portion 122 and the groove bottom of the groove 1121 is B. In order to meet the installation requirements of the limiting pin 142, B>A. At the same time, the distance between the limiting protrusion 141 and the cover plate 115 is C. In order to meet the travel requirements of the return rod 140, C>B.

[0072] Furthermore, the axial limiting structure 100 further includes a second sealing member 152, which is disposed between the wear-resistant plate 120 and the end cover 110, so as to seal the oil storage cavity 156 through the second sealing member 152. Specifically, the second sealing member 152 is a sealing ring. The second sealing member 152 is disposed between the circumferential surface of the wear-resistant plate 120 and the cover body 112 to achieve sealing of the oil storage cavity 156.

[0073] According to an axial limiting structure 100 provided in this embodiment, the working principle of the axial limiting structure 100 is:

[0074] When in use, the axial limiting structure 100 is installed on the housing 210, and the axial limiting structure 100 is located at one axial end of the gear shaft 220. When the gear shaft 220 moves axially in the direction close to the end cover 110, the end face 221 of the gear shaft 220 contacts the contact surface 121, thereby applying an axial force to the wear-resistant plate 120 and the return rod 140. The elastic member 130 is compressed under the action of the axial force, thereby reducing the axial impact on the wear-resistant plate 120. The wear-resistant plate 120 and the return rod 140 move synchronously, and the limiting protrusion 141 of the return rod 140 is separated from the cover body 112, so that the first connecting hole 1133 is opened, and the lubricating oil enters the oil storage chamber 156 from the flow space 1132, and flows into the lubricating oil path 124 through the oil outlet hole 123, and the contact surface 121 is pressed. Lubrication, achieving self-lubrication, the excess lubricating oil in the lubricating oil circuit 124 flows back to the oil storage chamber 156 through the second connecting hole 125 to achieve circulation; when the gear shaft 220 moves in the direction away from the end cover 110, the axial force applied by the gear shaft 220 to the wear-resistant plate 120 and the return rod 140 disappears, and the wear-resistant plate 120 moves in the direction away from the end cover 110 under the elastic force of the elastic member 130, and at the same time, the return rod 140 is driven by the limit pin 142 to move synchronously with the wear-resistant plate 120, and the limit protrusion 141 of the return rod 140 presses the first sealing member 151 into the first accommodating groove 1122, thereby closing the first connecting hole 1133.

[0075] The axial limiting structure 100 provided in this embodiment has at least the following advantages:

[0076] The axial limiting structure 100 provided by the embodiment of the present invention absorbs the axial force applied to the axial limiting structure 100 by the axial movement of the gear shaft 220 by setting an elastic member 130, thereby reducing the axial impact caused by the gear shaft 220 on the axial limiting structure 100, and further reducing the damage to the axial limiting structure 100, which helps to extend the service life. An oil inlet channel 113 is provided in the axial limiting structure 100, and the lubricating oil splashed by the gear meshing is collected through the oil inlet channel 113, and the lubricating oil is used to lubricate the contact surface 121 of the wear-resistant plate 120, which has a good lubrication effect and further reduces the damage to the wear-resistant plate 120. At the same time, the return rod 140 of the axial limiting structure 100 can move according to the axial movement of the gear shaft 220, and realize the connection and disconnection of the oil inlet channel 113 and the oil outlet hole 123, thereby realizing self-lubrication. Moreover, since the axial limiting structure 100 provided in the embodiment of the present invention is provided with an elastic member 130, there is no need to reserve an axial gap during installation, and the end face 221 of the gear shaft 220 can be directly set as the extrusion contact face 121. The temperature rise expansion of the gear shaft 220 can be automatically adjusted by the elastic member 130, and the use effect is good.

[0077] This embodiment also provides a gear box 10, which includes the above-mentioned axial limiting structure 100. Since the gear box 10 includes the above-mentioned axial limiting structure 100, it also has the beneficial effects of small axial impact, long service life and good lubrication effect.

[0078] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An axial limiting structure for cooperating with a gear transmission device, wherein the gear transmission device comprises a gear shaft and a housing, It is characterized in that The axial limiting structure includes an end cover and an elastic member connected to the end cover, the end cover is used to be fixedly connected to the housing, and one end of the elastic member away from the end cover is used to act on the end surface of the gear shaft, and when the gear shaft moves in a direction close to the end cover, the elastic member is used to apply an elastic force to the gear shaft to move away from the end cover, so as to limit the gear shaft along the axial direction of the gear shaft; The axial limiting structure also includes a wear-resistant plate, the elastic member is arranged between the wear-resistant plate and the end cover, and the end cover, the elastic member and the wear-resistant plate are arranged in sequence along a preset direction, and the end of the wear-resistant plate away from the end cover has a contact surface, and the contact surface is used to contact the end surface of the gear shaft, so that the elastic member acts on the end surface of the gear shaft; An oil inlet channel is provided on the end cover, an oil outlet hole is provided on the wear-resistant plate, the oil inlet channel is connected to the oil outlet hole, and the oil outlet hole is used to supply oil to the contact surface; The oil inlet passage comprises an oil inlet hole, a flow space and a first communicating hole which are connected in sequence, and the first communicating hole is connected to the oil outlet hole; The axial limiting structure comprises a first part and a second part located on both sides of a preset plane, and the preset plane coincides with the axis of the axial limiting structure; the oil inlet hole is provided in the end cover of the first part, the oil outlet hole is provided in the wear-resistant plate of the second part, 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; The axial limiting structure also includes a return rod, which passes through the first connecting hole and is connected to the wear-resistant plate; the return rod is slidably matched with the end cover, and when the gear shaft moves along the preset direction, the return rod slides relative to the end cover along the preset direction to open or close the first connecting hole.

2. The axial limiting structure according to claim 1, It is characterized in that The end cover has a clamping groove, and the wear-resistant plate has a clamping portion, and the clamping portion is clamped in the clamping groove to connect the wear-resistant plate to the end cover; Wherein, the dimension of the clamping groove in the preset direction is greater than the dimension of the clamping portion in the preset direction, so that the wear-resistant plate can move relative to the end cover along the preset direction.

3. The axial limiting structure according to claim 2, It is characterized in that Along the circumference of the end cover, the clamping groove has two opposite end surfaces, and the two end surfaces are respectively used to limit the clamping part to prevent the wear-resistant plate from rotating relative to the end cover.

4. The axial limiting structure according to claim 2, It is characterized in that The end cover includes a cover body and a pressure plate; a groove is provided on the cover body, and along the preset direction, the groove has an opening at one end close to the wear-resistant plate; the pressure plate is fixedly connected to the cover body, and the pressure plate blocks the opening to form the snap-in groove.

5. The axial limiting structure according to claim 1, It is characterized in that A limiting protrusion is provided at one end of the return rod away from the wear-resistant plate, and the size of the limiting protrusion is larger than the radial size of the first connecting hole; when the limiting protrusion abuts against the end cover, the limiting protrusion closes the first connecting hole to close the first connecting hole; when the limiting protrusion is separated from the end cover, the first connecting hole is opened.

6. The axial limiting structure according to claim 5, It is characterized in that The axial limiting structure further includes a first sealing member, which is located between the limiting protrusion and the end cover. When the limiting protrusion abuts against the end cover through the first sealing member, the first communicating hole is closed.

7. The axial limiting structure according to claim 1, It is characterized in that The contact surface is provided with a lubricating oil passage connected with the oil outlet hole.

8. The axial limiting structure according to claim 7, It is characterized in that The lubricating oil passage comprises a first lubricating oil passage extending in the circumferential direction of the wear-resistant plate and a second lubricating oil passage extending in the radial direction of the wear-resistant plate. The first lubricating oil passage, the second lubricating oil passage and the oil outlet hole are connected to each other.

9. The axial limiting structure according to claim 7, It is characterized in that An oil storage chamber is formed between the end cover and the wear-resistant plate, and the oil inlet channel is connected with the oil outlet hole through the oil storage chamber; a second connecting hole is also provided on the wear-resistant plate, and the second connecting hole is connected with the lubricating oil circuit and the oil storage chamber at the same time, so that excess lubricating oil after lubricating the contact surface can flow back to the oil storage chamber through the second connecting hole.

10. A gear box, It is characterized in that The gear box comprises the axial limiting structure according to any one of claims 1-9.

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