Wear-resistant idler wheel gasket and wear-resistant reverse idler wheel structure

Abstract

The present invention relates to a wear-resistant idler wheel gasket and a wear-resistant reverse idler wheel structure, which are used to be clamped between the housing and the idler wheel of the idler wheel structure, wherein the idler wheel is mounted on the axle, and the wear-resistant idler wheel gasket comprises: a main body, the main body having an inner hole, and the main body is provided with a protrusion protruding from the surface of the main body, the protrusion is used to cooperate with the slot of the housing or the axle; the main body is also provided with an oil groove, the oil groove is connected to the inner hole, and the oil groove extends from the outer edge to the inner edge of the main body. The wear-resistant idler wheel gasket and the wear-resistant reverse idler wheel structure of the present invention are such that the protrusion of the wear-resistant idler wheel gasket can cooperate with the slot of the housing or the axle when in use, so that the protrusion can be stuck in the slot, which can prevent the wear-resistant idler wheel gasket from rotating with the idler wheel, and avoid the wear-resistant idler wheel gasket from wearing the housing, and the oil groove provided on the main body is conducive to oil inlet, which lubricates the wear-resistant idler wheel gasket and further reduces friction.

Description

Technical Field

[0001] The invention relates to the technical field of automobile transmission speed change systems, in particular to a wear-resistant idler wheel gasket and a wear-resistant reverse idler wheel structure. Background Art

[0002] With the rapid development of car ownership and the sharp increase in the number of non-professional drivers, automobile automatic transmissions are showing a rapid development trend.

[0003] The transmission, an essential gearshift device in a car, creates different speed ratios between the engine and wheels during driving, enabling the engine to operate at its optimal performance. The transmission housing houses multiple sets of gears to transmit different speed ratios. However, simply changing the speed ratios is not enough to achieve reverse travel. Therefore, the transmission housing also contains a reverse idler gear. The idler gear meshes with both gears, changing the rotational direction of the front and rear gears without changing the transmission ratio. The idler gear is supported by a needle bearing and an idler shaft, which is supported through the idler shaft mounting hole in the housing.

[0004] In the related art, the idler wheel is generally mounted directly on the housing and in direct contact with the housing. However, this will inevitably cause the idler wheel to rub against the end face of the housing during transmission, thereby wearing the housing. In order to avoid wear of the housing, a wear-resistant gasket can be added between the housing and the idler wheel. However, the general gasket material is generally bronze or heat-treated steel. The gasket is directly clamped between the housing and the idler wheel and is easy to rotate with the idler wheel, thereby continuing to rub the housing.

[0005] Therefore, it is necessary to design a new wear-resistant idler wheel gasket and a wear-resistant reverse gear idler wheel structure to overcome the above problems. Summary of the Invention

[0006] The embodiments of the present invention provide a wear-resistant idler wheel gasket and a wear-resistant reverse idler wheel structure to solve the problem in the related art that a general gasket is directly clamped between a housing and an idler wheel and easily rotates with the idler wheel, thereby continuing to rub the housing.

[0007] In a first aspect, a wear-resistant idler wheel gasket is provided, which is used to be clamped between the shell and the idler wheel of the idler wheel structure, wherein the idler wheel is mounted on the wheel axle, and the wear-resistant idler wheel gasket includes: a main body, the main body has an inner hole, and the main body is provided with a protrusion protruding from the surface of the main body, and the protrusion is used to cooperate with the slot of the shell or the wheel axle; the main body is also provided with an oil groove, the oil groove is connected to the inner hole, and the oil groove extends from the outer edge of the main body to the inner edge.

[0008] In some embodiments, the oil groove is tangent to the inner hole.

[0009] In some embodiments, when the idler wheel rotates relative to the washer in a first direction, the oil groove extends from the outer edge of the main body to the inner edge of the main body in the first direction.

[0010] In some embodiments, the main body is annular, and the oil groove has an outer edge and an inner edge in the shape of an arc; the center o2 of the outer edge and the center o1 of the main body have a center distance Center distance It is determined according to the outer circle radius r1 of the main body and the inner diameter r2 of the inner hole.

[0011] In a second aspect, a wear-resistant reverse idler wheel structure is provided, which includes: a shell, an idler wheel and an axle passing through the idler wheel are mounted on the shell, wherein the above-mentioned wear-resistant idler wheel gasket is sandwiched between at least one side of the idler wheel and the shell.

[0012] In some embodiments, the wear-resistant idler gaskets are provided on opposite sides of the idler, wherein the oil groove on one of the wear-resistant idler gaskets extends in a first direction, and the oil groove on the other wear-resistant idler gasket extends in a second direction, and the second direction is opposite to the first direction.

[0013] In some embodiments, the housing has a mounting cavity for accommodating the idler wheel; the axle has a first step, the first step protrudes into the mounting cavity along the axial direction of the axle, and the first step and the wear-resistant idler wheel gasket are respectively located on opposite sides of the idler wheel.

[0014] In some embodiments, the axle has a second step, and the second step abuts against one side of the wear-resistant idler wheel gasket, so that the wear-resistant idler wheel gasket is clamped between the housing and the second step.

[0015] In some embodiments, a clamping gap is formed between the wear-resistant idler wheel gasket and the first step, the width of the clamping gap is L1, the idler wheel has a contact end that contacts the wear-resistant idler wheel gasket or the first step, the outer circle radius of the contact end is R, the width between the two opposite contact ends of the idler wheel is L2, and a needle roller is provided between the idler wheel and the wheel axle; the size of the clamping gap L1 is determined according to the outer circle radius R of the contact end, the radial clearance C of the needle roller, the width L2 between the two opposite contact ends of the idler wheel, and the length L3 of the needle roller.

[0016] In some embodiments, a through hole and a countersunk groove are provided in the wheel axle, and the through hole is connected to the countersunk groove; a first bolt passes through the through hole to be fixed to the shell, and the head of the first bolt is located in the countersunk groove.

[0017] The beneficial effects brought about by the technical solution provided by the present invention include:

[0018] An embodiment of the present invention provides a wear-resistant idler wheel gasket and a wear-resistant reverse idler wheel structure. Since a protrusion structure is provided on the main body, the wear-resistant idler wheel gasket can cooperate with the slot of the shell or the wheel axle when in use, so that the protrusion can be stuck in the slot, which can prevent the wear-resistant idler wheel gasket from rotating with the idler wheel, avoiding the wear-resistant idler wheel gasket from wearing the shell, and the oil groove provided on the main body is conducive to oil inlet, which lubricates the wear-resistant idler wheel gasket and further reduces friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic front view of a wear-resistant idler wheel gasket provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the center distance between the outer edge and the main body of a wear-resistant idler wheel gasket provided by an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of a gasket with an oil groove extending clockwise provided in an embodiment of the present invention;

[0023] Figure 4 A schematic structural diagram of a gasket with an oil groove extending counterclockwise provided in an embodiment of the present invention;

[0024] Figure 5 A cross-sectional schematic diagram of a wear-resistant reverse idler gear structure provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a partial three-dimensional structure of a wear-resistant reverse idler gear structure provided by an embodiment of the present invention;

[0026] Figure 7 A schematic cross-sectional view of another wear-resistant reverse idler gear structure provided by an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the forces acting on an idler wheel according to an embodiment of the present invention;

[0028] Figure 9 A schematic diagram of the rollover of an idler wheel provided in an embodiment of the present invention.

[0029] In the picture:

[0030] 1. Wear-resistant idler washer; 11. Main body; 111. Inner hole; 12. Protrusion; 13. Oil groove; 131. Outer edge; 132. Inner edge;

[0031] 2. Housing; 21. Mounting cavity; 22. Mounting hole; 221. Bottom surface; 3. Idle pulley; 31. Needle roller;

[0032] 4. Axle; 41. First step; 42. Second step; 43. Perforation; 44. Countersunk groove; 45. Limiting groove;

[0033] 5. First bolt; 6. Second bolt; 7. Positioning plate; 8. Sealing ring; 9. Slot. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The embodiments of the present invention provide a wear-resistant idler wheel gasket and a wear-resistant reverse idler wheel structure, which can solve the problem in the related art that a general gasket is directly clamped between a housing and an idler wheel and easily rotates with the idler wheel, thereby continuing to rub the housing.

[0036] See also Figure 1 and Figure 4 As shown, a wear-resistant idler wheel gasket 1 provided by an embodiment of the present invention is used to be clamped between the housing 2 and the idler wheel 3 of the idler wheel structure, wherein the idler wheel 3 is mounted on the wheel shaft 4, and the wear-resistant idler wheel gasket 1 may include: a main body 11, the main body 11 has an inner hole 111, wherein the inner hole 111 is used to penetrate the wheel shaft 4, and the main body 11 is provided with a protrusion 12 protruding from the surface of the main body 11, wherein the protrusion 12 may be a convex structure formed by protruding from the main body 11 to one side thereof, or may be an inverted structure formed by tearing from the main body 11 Barb structure, in this embodiment, the protrusion 12 is preferably formed by tearing from the main body 11. Such a configuration makes the protrusion 12 easy to form and does not generate excess waste; the protrusion 12 is used to cooperate with the slot 9 of the shell 2 or the wheel axle 4 so that the protrusion 12 is clamped in the slot 9; the main body 11 can also be provided with an oil groove 13, the oil groove 13 is connected to the inner hole 111, and the oil groove 13 extends from the outer edge of the main body 11 to the inner edge, so that the lubricating oil can flow from the outer edge of the main body 11 along the oil groove 13 to the inner hole 111.

[0037] In this embodiment, since a protrusion 12 structure is provided on the main body 11, the wear-resistant idler gasket 1 can cooperate with the slot 9 of the shell 2 or the wheel axle 4 when in use, so that the protrusion 12 can be stuck in the slot 9, which can make the wear-resistant idler gasket 1 stationary relative to the shell 2, preventing the wear-resistant idler gasket 1 from rotating with the idler 3, and avoiding the wear-resistant idler gasket 1 from wearing the shell 2. The oil groove 13 provided on the main body 11 is conducive to oil inlet, which lubricates the wear-resistant idler gasket 1 and the needle roller 31 on the inner side of the idler 3, further reducing friction and improving reliability.

[0038] Furthermore, the thickness of the wear-resistant idler wheel gasket 1 is preferably 1.5 to 2 mm, and the surface hardness can reach HV450 by using cold-rolled 08 steel strip and soft nitriding treatment.

[0039] Preferably, see Figure 1 and Figure 2 As shown, the oil groove 13 is tangent to the inner hole 111. The oil inlet end of the oil groove 13 can be tangent to the oil flow direction, and the oil outlet end of the oil groove 13 is tangent to the edge of the inner hole 111. This allows the lubricating oil to continue flowing forward along its flow direction within the oil groove 13 when entering the inner hole 111. That is, after exiting the oil groove 13, the lubricating oil can flow directly and smoothly along the inner wall of the inner hole 111. With this arrangement, the lubricating oil experiences less impact resistance from the wheel axle 4 during the process of entering the inner hole 111 from the oil groove 13, ensuring that the lubricating oil is smoothly introduced into the inner hole 111 for lubrication.

[0040] In some embodiments, see Figure 1 、 Figure 3 and Figure 4 As shown, when the idler wheel 3 rotates in a first direction relative to the wear-resistant idler wheel gasket 1, the oil groove 13 extends from the outer edge of the main body 11 to the inner edge of the main body 11 in the first direction. Assuming that the idler wheel 3 rotates clockwise relative to the wear-resistant idler wheel gasket 1, the oil groove 13 can be designed as a clockwise spiral structure, that is, the oil groove 13 extends from the outer edge of the main body 11 to the inner edge of the main body 11 in a clockwise direction, ensuring that the lubricating oil is reliably introduced into the inner hole 111 and lubricated along the rotation direction of the idler wheel 3. Compared with lubricating against the rotation direction of the idler wheel 3, lubricating along the rotation direction of the idler wheel 3 has a better effect. On the contrary, when the idler wheel 3 rotates counterclockwise relative to the wear-resistant idler wheel gasket 1, the oil groove 13 can be designed as a counterclockwise spiral structure, that is, the oil groove 13 extends from the outer edge of the main body 11 to the inner edge of the main body 11 in a counterclockwise direction.

[0041] Furthermore, a plurality of oil grooves 13 may be provided on one side of the wear-resistant idler gasket 1. For ease of processing, each oil groove 13 is preferably a quarter-circular arc. When the oil groove 13 extends clockwise, the slope of the oil groove 13 relative to the horizontal axis is negative, that is, 90°≤β≤180°, which can ensure that the lubricating oil is smoothly introduced into the inner hole 111. When the oil groove 13 extends counterclockwise, the slope of the oil groove 13 relative to the horizontal axis is positive, that is, 0°≤β≤90°, which can ensure that the lubricating oil is smoothly introduced into the inner hole 111. In this embodiment, the wear-resistant idler gasket 1 is provided with four evenly distributed oil grooves 13 to ensure uniform oil supply and processing efficiency.

[0042] See also Figure 2 As shown, in some optional embodiments, the main body 11 is annular. Of course, in other embodiments, the main body 11 can also be set as a square ring or other ring shapes according to actual needs. The oil groove 13 has an arc-shaped outer edge 131 and an inner edge 132; the center o2 of the outer edge 131 is a circle with a center distance o1 of 0. Center distance It can be determined based on the outer radius r1 of the main body 11 and the inner diameter r2 of the inner hole 111. Assuming that the radius of the outer edge 131 is x, then:

[0043] Center distance According to the trigonometric function relationship: r1 2 =x 2 +(x-r2) 2 , we can get:

[0044]

[0045]

[0046] Therefore, the center distance can be calculated based on the outer radius r1 of the main body 11 and the inner diameter r2 of the inner hole 111. In reality, the distance between the center o2 and the center o1 can be slightly larger than the calculated center distance. The value is set to prevent the inner hole 111 from having a sharp point after processing, wherein the actual distance between the center o2 and the center o1 can be 0.5 to 1 mm larger than the calculated value.

[0047] Furthermore, the inner edge of the oil groove 13 can be parallel to the outer edge, and the distance between the inner edge and the outer edge is preferably greater than 2 mm, and the groove depth of the oil groove 13 is preferably greater than or equal to 0.5 mm, and less than or equal to half the thickness of the wear-resistant idler gasket 1, so as to facilitate the flow of lubricating oil.

[0048] Preferably, when the oil groove 13 on the wear-resistant idler gasket 1 extends counterclockwise, except that the extension direction of the oil groove 13 is opposite to the extension direction of the oil groove 13 of the wear-resistant idler gasket 1 when it is clockwise, other parameters and calculation methods can be the same. At the same time, when installing the wear-resistant idler gasket 1 with different rotation directions, it should be noted that the installation position of the wear-resistant idler gasket 1 cannot be installed in reverse.

[0049] The embodiment of the present application designs a spiral oil groove 13 and a parameter definition formula that are suitable for the flow of lubricating oil, which can ensure that the wear-resistant idler wheel gasket 1 and the needle roller 31 are well lubricated. The wear-resistant idler wheel gasket 1 is installed in pairs according to the direction of rotation to ensure that oil can be supplied to both ends of the idler wheel 3, thereby increasing the lubrication flow and ensuring sufficient lubrication. In addition, one gasket 1 is provided with four oil grooves 13, and the finished steel strip and soft nitriding process are selected, which have good wear resistance, low price, and easy processing, and at the same time solve the problems of end face wear of the idler wheel 3 and insufficient lubrication of the needle roller 31, which is simple and efficient.

[0050] See also Figure 5 and Figure 7 As shown, a wear-resistant reverse idler wheel structure provided by an embodiment of the present invention may include: a housing 2, wherein the housing 2 has a mounting cavity 21, and the housing 2 has a mounting hole 22, wherein the mounting hole 22 is connected to the mounting cavity 21, wherein the mounting cavity 21 may be circular, and the axis of the mounting cavity 21 coincides with the axis of the mounting hole 22, and the mounting hole 22 may be a through hole or a blind hole; an idler wheel 3, which may be mounted in the mounting cavity 21, and at least one side of the idler wheel 3 may be provided with a gasket 1, wherein the gasket 1 is clamped between the housing 2 and the mounting cavity 21. Between the idler wheel 3, wherein it can be understood here that there may be a gap between the gasket 1 and the idler wheel 3, or there may be no gap. By arranging the gasket 1, the idler wheel 3 can be separated from the housing 2, so that the idler wheel 3 is not directly in contact with the housing 2, wherein the gasket 1 can be the wear-resistant idler wheel gasket 1 provided in any of the above embodiments; the axle 4, which can be installed in the mounting hole 22, and the axle 4 is passed through the idler wheel 3, that is, a hole is provided inside the idler wheel 3, and the axle 4 is passed through the hole, so that the idler wheel 3 can rotate around the axis of the axle 4.

[0051] In this embodiment, since a gasket 1 is provided between the idler wheel 3 and the housing 2, the gasket 1 is clamped between the idler wheel 3 and the housing 2. The position where the gasket 1 is provided on the idler wheel 3 will contact the gasket 1 when moving but will not directly contact the housing 2, thereby preventing the idler wheel 3 from directly wearing the housing 2, and the protrusion 12 and oil groove 13 on the gasket 1 can play an anti-rotation and lubrication role.

[0052] In some embodiments, see Figure 5 and Figure 6As shown, the gasket 1 can be provided on both opposite sides of the idler wheel 3, that is, at least one gasket 1 is provided on the left side of the idler wheel 3, and at least one gasket 1 is provided on the right side of the idler wheel 3, wherein the structural shapes of the gaskets 1 can be the same or different. The gasket 1 can be provided with a protrusion 12, and the housing 2 or the wheel axle 4 is provided with a slot 9 corresponding to the protrusion 12, and the protrusion 12 protrudes into the slot 9. In other words, the protrusion 12 on the gasket 1 can cooperate with both the housing 2 and the wheel axle 4. Accordingly, when the slot 9 is provided on the housing 2, the protrusion 12 cooperates with the slot 9 on the housing 2, and when the slot 9 is provided on the wheel axle 4, the protrusion 12 cooperates with the slot 9 on the wheel axle 4. In this embodiment, it is preferred to provide the slot 9 on the housing 2 near the gasket 1. By providing the slot 9 to cooperate with the protrusion 12, the gasket 1 can be prevented from rotating relative to the housing 2, thereby avoiding the gasket 1 from wearing the housing 2, and the structure is simple, which improves reliability. Among them, the protrusion 12 can be a convex structure formed by protruding from the main body 11 of the gasket 1 to one side thereof, or it can be a barb structure formed by tearing from the main body 11. In this embodiment, the protrusion 12 is preferably formed by tearing from the main body 11. Such a setting makes the protrusion 12 easy to form and does not generate excess waste.

[0053] Among the wear-resistant idler wheel gaskets 1 on the left and right sides of the idler wheel 3, the oil groove 13 on one of the wear-resistant idler wheel gaskets 1 extends in a first direction, and the oil groove 13 on the other wear-resistant idler wheel gasket 1 extends in a second direction, and the second direction is opposite to the first direction. Since the rotation direction of the idler wheel 3 relative to the wear-resistant idler wheel gaskets 1 on the left and right sides is just opposite, the oil grooves 13 of the two wear-resistant idler wheel gaskets 1 are also designed to be opposite, ensuring that the oil grooves 13 on each side of the idler wheel 3 can achieve better lubrication effect.

[0054] Furthermore, when wear-resistant idler wheel gaskets 1 are provided on both opposite sides of the idler wheel 3 , the thickness of the wear-resistant idler wheel gasket 1 is preferably less than 2 mm, and the wear-resistant idler wheel gasket 1 can be made of steel and be heat-treated.

[0055] In some optional embodiments, see Figure 7As shown, the axle 4 may have a first step 41, and the first step 41 may protrude into the mounting cavity 21 along the axial direction of the axle 4. That is, the end surface of the first step 41 exceeds the inner wall surface of the mounting cavity 21, so that it can protrude into the interior of the mounting cavity 21, and the first step 41 and the wear-resistant idler gasket 1 are respectively located on opposite sides of the idler 3. In this embodiment, since the first step 41 protrudes into the mounting cavity 21, the first step 41 is closer to the idler 3 than the inner wall of the mounting cavity 21. That is, the left side of the idler 3 faces the wear-resistant idler gasket 1, and the right side of the idler 3 faces the first step 41. When the idler 3 is in motion, it will preferentially contact the wear-resistant idler gasket 1 or the first step 41 to which it is closer, thereby preventing the left and right sides of the idler 3 from directly contacting the housing 2 and causing wear to the housing 2.

[0056] Further, in some embodiments, see Figure 7 As shown, the wheel shaft 4 may further have a second step 42, which may abut against one side of the wear-resistant idler wheel gasket 1, so that the wear-resistant idler wheel gasket 1 is clamped between the housing 2 and the second step 42. That is, one side of the wear-resistant idler wheel gasket 1 contacts the housing 2, and the other side of the wear-resistant idler wheel gasket 1 contacts the second step 42. The wear-resistant idler wheel gasket 1 can be clamped by the second step 42 to prevent the wear-resistant idler wheel gasket 1 from axial movement.

[0057] Further, see Figure 7 As shown, there may be a gap between the end face of the wheel axle 4 and the bottom surface 221 of the mounting hole 22. In this embodiment, the mounting hole 22 may be a blind hole, that is, one end of the mounting hole 22 is connected to the outside world, so that the wheel axle 4 is inserted into the mounting hole 22, and the other end of the mounting hole 22 does not pass through the shell 2, so that the other end of the mounting hole 22 forms a bottom surface 221. When the wheel axle 4 is installed in the mounting hole 22 and the second step 42 contacts the side of the wear-resistant idler gasket 1, a gap may be formed between the front end face of the wheel axle 4 and the bottom surface 221 of the mounting hole 22, that is, the front end face of the wheel axle 4 does not contact the bottom surface 221 of the mounting hole 22, ensuring that the wheel axle 4 presses the wear-resistant idler gasket 1 to prevent the wear-resistant idler gasket 1 from axial movement and rotation, and the clamping gap formed between the wear-resistant idler gasket 1 and the first step 41 is more reliable.

[0058] In some optional embodiments, see Figure 7As shown, a through-hole 43 and a countersunk groove 44 can be provided in the wheel axle 4, wherein the through-hole 43 is connected to the countersunk groove 44, wherein the through-hole 43 can extend along the axial direction of the wheel axle 4, or can extend along the radial direction of the wheel axle 4, or can extend obliquely in the wheel axle 4, and the countersunk groove 44 and the through-hole 43 have the same extension direction; a first bolt 5 can pass through the through-hole 43 to be fixed to the housing 2, thereby axially limiting the wheel axle 4, wherein the first bolt 5 can be threadedly connected to the housing 2 after passing through the through-hole 43, and the head of the first bolt 5 is located in the countersunk groove 44, thereby preventing the head of the bolt from emerging. In this embodiment, it is preferred that the through-hole 43 is arranged to extend along the axial direction of the wheel axle 4, so that the through-hole 43 can pass through the wheel axle 4 front and back along the axial direction of the wheel axle 4, and the length of the through-hole 43 is long, and the first bolt 5 passed through the through-hole 43 can limit the wheel axle 4 everywhere along the axial direction of the wheel axle 4.

[0059] In some embodiments, see Figure 8 and Figure 9 As shown, a needle roller 31 is provided between the idler wheel 3 and the axle 4, so that the radial direction of the idler wheel 3 is supported on the outer circle of the axle 4 by the needle roller 31; a clamping gap is formed between the wear-resistant idler wheel gasket 1 and the first step 41, and the idler wheel 3 is located in the clamping gap, and the width of the clamping gap is L1. The idler wheel 3 has a contact end that contacts the wear-resistant idler wheel gasket 1 or the first step 41 (that is, the idler wheel 3 is at the left and right ends), the outer circle radius of the contact end is R, and the width between the two opposite contact ends of the idler wheel 3 is L2; the size of the clamping gap L1 is determined according to the outer circle radius R of the contact end, the radial clearance C of the needle roller 31, the width L2 between the two opposite contact ends of the idler wheel 3, and the length L3 of the needle roller 31.

[0060] Among them, according to the positional relationship, it can be obtained that: tanα=C / L3, L4=R×tanα, L1 / 2=(L4+L2 / 2)×cosα, α is the flipping angle of the idler wheel 3 relative to the needle roller 31 and the wheel axle 4, and L4 is the distance between the center point of the end face of the idler wheel 3 and the end face of the wear-resistant idler wheel gasket 1 or the end face of the first step 41 after the idler wheel 3 is flipped, and the distance is perpendicular to the end face of the idler wheel 3.

[0061] According to the above formula, we can get:

[0062] Because the radial clearance C is very small, Formula (3) can be rewritten as:

[0063]

[0064] Therefore, in order to ensure that the end face of the idler wheel 3 and the clamping end face are not squeezed after flipping, it is necessary to ensure that:

[0065]

[0066] At this time, the turning torque is entirely borne by the needle roller 31. In fact, even if the end face of the idler wheel 3 and the clamping end face are not squeezed, the idler wheel 3 will move axially with the bumps of the car, and there will be friction with the clamping end face. It is also necessary to install wear-resistant parts to improve reliability.

[0067] In the related art, the idler 3 is generally helical. When the helical idler 3 is working, it meshes with two gears at the same time. The helical teeth are subjected to two axial forces Fa1 and Fa2. These two forces are equal in magnitude and opposite in direction, forming a turning torque. Due to the existence of radial clearance C of needle roller 31, the idler 3 is forced to turn at a certain angle α relative to needle roller 31 and axle 4. Since the idler 3 rotates relative to axle 4, housing 2, and wear-resistant idler gasket 1, it is generally believed in the related art that the end face clearance Δ between the idler 3 and housing 2 is greater than 0, without considering the influence of the turning of the idler 3. In this embodiment, after the clamping clearance L1 is designed through the above calculation, it can be ensured that the end face of the idler 3 and the clamping end face are not squeezed after turning, effectively reducing wear. On the basis of the wear-resistant wear-resistant idler gasket 1 set in this application, the end face clearance formula is added to greatly improve the reliability, and it is suitable for the design and development of all similar structures such as the reverse idler 3 of the transmission, planetary gears, and power take-off idler 3.

[0068] Preferably, an interference fit may be employed between the wheel axle 4 and the mounting hole 22 to prevent the wheel axle 4 from rotating relative to the housing 2 .

[0069] Further, see Figure 7 As shown, the wear-resistant idler wheel gasket 1 is sleeved on the outside of the wheel shaft 4, and the inner hole 111 of the wear-resistant idler wheel gasket 1 and the outer circumferential surface of the wheel shaft 4 can adopt an interference fit, thereby effectively preventing the wear-resistant idler wheel gasket 1 from rotating relative to the housing 2.

[0070] In some embodiments, see Figure 5 As shown, the wheel axle 4 can be provided with a limiting groove 45, and a positioning plate 7 is inserted in the limiting groove 45 along the radial direction of the wheel axle 4. The positioning plate 7 is installed on the shell 2 through the second bolt 6, that is, one end of the positioning plate 7 is inserted into the limiting groove 45, and the other end of the positioning plate 7 is fixed to the shell 2 through the second bolt 6, thereby achieving the fixation of the wheel axle 4 and the shell 2 and preventing the wheel axle 4 from axial movement.

[0071] The installation sequence of the idler wheel structure in this embodiment can be: during installation, one of the wear-resistant idler wheel gaskets 1, the idler wheel 3 and the needle roller 31 are placed in the installation cavity 21 in sequence, and then the wheel axle 4 is inserted from the right end and pressed to the left, and finally the bolts are tightened. When the wheel axle 4 is pressed axially, the left end of the wear-resistant idler wheel gasket 1 is close to the end face of the shell 2, and the right end is close to the second step 42. There is still a gap between the front end face of the wheel axle 4 and the bottom surface 221 of the installation hole 22.

[0072] Furthermore, when the wear-resistant idler wheel gasket 1 is installed on the left side of the idler wheel 3 and the right side of the idler wheel 3 contacts the first step 41 of the wheel axle 4, the wheel axle 4 and the wear-resistant idler wheel gasket 1 can be carburized and quenched with wear-resistant bearing steel GCr15, and the surface hardness is greater than or equal to HRC60. To prevent brittleness due to hardening, the thickness of the wear-resistant idler wheel gasket 1 is greater than or equal to 5 mm.

[0073] Furthermore, a sealing ring 8 may be provided between the housing 2 and the axle 4 to prevent oil leakage.

[0074] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0075] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0076] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A wear-resistant reverse idler wheel structure, characterized in that: It includes: A housing (2), an idler wheel (3) and a wheel shaft (4) passing through the idler wheel (3) are mounted on the housing (2), wherein a wear-resistant idler wheel gasket (1) is sandwiched between at least one side of the idler wheel (3) and the housing (2); Wherein, the wear-resistant idler wheel gasket (1) comprises: A main body (11), the main body (11) having an inner hole (111), and the main body (11) is provided with a protrusion (12) protruding from a surface of the main body (11), the protrusion (12) being used to cooperate with a slot (9) of the housing (2) or the wheel axle (4); An oil groove (13) is also provided on the main body (11), the oil groove (13) is communicated with the inner hole (111), and the oil groove (13) extends from the outer edge to the inner edge of the main body (11); The housing (2) has a mounting cavity (21) for accommodating the idler wheel (3); The wheel axle (4) has a first step (41), the first step (41) protruding into the mounting cavity (21) along the axial direction of the wheel axle (4), and the first step (41) and the wear-resistant idler wheel gasket (1) are respectively located on opposite sides of the idler wheel (3); A clamping gap is formed between the wear-resistant idler wheel gasket (1) and the first step (41), and the width of the clamping gap is The idler wheel (3) has a contact end that contacts the wear-resistant idler wheel gasket (1) or the first step (41), and the outer circle radius of the contact end is , the width between the two opposite contact ends of the idler wheel (3) is , and a needle roller (31) is provided between the idler wheel (3) and the wheel shaft (4); The clamping gap The size of the outer radius of the contact end is , the radial clearance of the needle roller (31) The width between the two opposite contact ends of the idler wheel (3) is , and the length of the needle roller (31) Confirm and satisfy .

2. The wear-resistant reverse idler wheel structure according to claim 1, characterized in that: The wear-resistant idler gaskets (1) are provided on opposite sides of the idler (3), wherein the oil groove (13) on one of the wear-resistant idler gaskets (1) extends in a first direction, and the oil groove (13) on the other wear-resistant idler gasket (1) extends in a second direction, and the second direction is opposite to the first direction.

3. The wear-resistant reverse idler wheel structure according to claim 1, characterized in that: The wheel shaft (4) has a second step (42), and the second step (42) abuts against one side of the wear-resistant idler wheel gasket (1), so that the wear-resistant idler wheel gasket (1) is clamped between the housing (2) and the second step (42).

4. The wear-resistant reverse idler wheel structure according to claim 1 or 2, characterized in that: A through hole (43) and a countersunk groove (44) are provided in the wheel shaft (4), and the through hole (43) is in communication with the countersunk groove (44); The first bolt (5) passes through the through hole (43) and is fixed to the housing (2), and the head of the first bolt (5) is located in the countersunk groove (44).

5. The wear-resistant reverse idler wheel structure according to claim 1, characterized in that: The oil groove (13) is tangent to the inner hole (111).

6. The wear-resistant reverse idler wheel structure according to claim 1, characterized in that: When the idler wheel (3) rotates relative to the washer in a first direction, the oil groove (13) extends from the outer edge of the main body (11) to the inner edge of the main body (11) in the first direction.

7. The wear-resistant reverse idler wheel structure according to claim 1, characterized in that: The main body (11) is annular, and the oil groove (13) has an outer edge (131) and an inner edge (132) in the shape of an arc. There is a center distance between the center o2 of the outer edge (131) and the center o1 of the main body (11). , center distance It is determined based on the outer circle radius r1 of the main body (11) and the inner diameter r2 of the inner hole (111).

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