A wear-resistant reverse idler gear structure

Abstract

This invention relates to a wear-resistant reverse idler gear structure, comprising: a housing having a mounting cavity and a mounting hole communicating with the mounting cavity; an idler gear mounted within the mounting cavity, with a gasket provided on at least one side of the idler gear, the gasket being sandwiched between the housing and the idler gear; and an axle mounted within the mounting hole, the axle passing through the idler gear, the idler gear being rotatable about the axis of the axle. This wear-resistant reverse idler gear structure, by providing a gasket between the idler gear and the housing, ensures that the idler gear, when moving, contacts the gasket instead of directly contacting the housing, thus preventing direct wear of the housing by the idler gear.

Description

Technical Field

[0001] This invention relates to the field of automotive transmission and gearbox technology, and in particular to a wear-resistant reverse idler gear structure. Background Technology

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

[0003] As an essential transmission device in automobiles, the gearbox creates different gear ratios between the engine and wheels during vehicle operation, allowing the engine to operate at its optimal power performance through gear shifting. The gearbox housing contains multiple sets of gears to transmit different speed ratios. However, when the car needs to reverse, simply changing the speed ratio is insufficient; therefore, a reverse idler gear is also included in the gearbox housing. The idler gear is sandwiched between two gears and meshes with both. Its function is to change the rotation direction of the two gears without altering the transmission ratio. The idler gear is supported by needle roller bearings and an idler gear shaft, which is supported by mounting holes on the housing.

[0004] In related technologies, a reverse idler gear structure for a transmission includes an idler shaft that passes through the inner hole of a housing, with an interference fit between the idler shaft and the inner hole of the housing to prevent rotation. The idler is sleeved on the idler shaft and clamped between the housing and the housing in the axial direction. A gap is left between the idler and the end face of the housing, and the idler is supported on the idler shaft in the radial direction by needle rollers. If the right end of the housing of this reverse idler structure is directly open to the outside, an O-ring needs to be installed to prevent oil leakage. If the right end of the housing is not open to the outside, an O-ring is not required.

[0005] However, the reverse idler gear is usually helical and meshes with two gears at the same time, generating a pair of axial forces of opposite direction and equal magnitude, forming a reversing torque, which causes the idler gear to tilt when rotating. In the above scheme, when the clearance between the idler gear and the end face of the housing is small and the radial clearance of the needle roller bearing is large, it is easy to rub against the end face of the housing. In addition, since the housing is generally made of cast iron or aluminum alloy, it wears out quickly.

[0006] Therefore, it is necessary to design a wear-resistant reverse idler gear structure to overcome the above problems. Summary of the Invention

[0007] This invention provides a wear-resistant reverse idler gear structure to solve the problem in related technologies where the end face of the idler gear and the housing is easily rubbed against the end face of the housing when the gap between the idler gear and the housing is small and the radial clearance of the needle roller bearing is large.

[0008] In a first aspect, a wear-resistant reverse idler gear structure is provided, comprising: a housing having a mounting cavity and a mounting hole communicating with the mounting cavity; an idler gear installed in the mounting cavity, with a gasket provided on at least one side of the idler gear, the gasket being sandwiched between the housing and the idler gear; and a wheel axle installed in the mounting hole, the wheel axle passing through the idler gear, the idler gear being rotatable about the axis of the wheel axle.

[0009] In some embodiments, the idler wheel has a gasket on each of its opposite sides, the gasket has a protrusion, and the housing or the wheel axle has a groove corresponding to the protrusion, the protrusion extending into the groove.

[0010] In some embodiments, the axle has a first step that protrudes into the mounting cavity along the axial direction of the axle, and the first step and the gasket are located on opposite sides of the idler wheel.

[0011] In some embodiments, the axle has a second step that abuts against one side of the gasket, such that the gasket is clamped between the housing and the second step.

[0012] In some embodiments, there is a gap between the end face of the axle and the bottom surface of the mounting hole.

[0013] In some embodiments, the axle has a through hole and a countersunk groove, the through hole communicating with the countersunk groove; a first bolt passes through the through hole and is fixed to the housing, and the head of the first bolt is located in the countersunk groove.

[0014] In some embodiments, a clamping gap is formed between the gasket and the first step, the width of the clamping gap being L1, the idler wheel having a contact end that contacts the gasket or the first step, the outer radius of the contact end being R, the width between the two opposite contact ends of the idler wheel being L2, and a needle roller being provided between the idler wheel and the wheel axle; the size of the clamping gap L1 is determined based on the outer radius of the contact end being R, the radial clearance C of the needle roller, the width between the two opposite contact ends of the idler wheel being L2, and the length L3 of the needle roller.

[0015] In some embodiments, an interference fit is used between the axle and the mounting hole.

[0016] In some embodiments, the gasket is fitted over the axle, and the inner hole of the gasket is interference-fitted with the outer surface of the axle.

[0017] In some embodiments, the axle is provided with a limiting groove, and a positioning plate is inserted into the limiting groove along the radial direction of the axle. The positioning plate is installed on the housing by a second bolt.

[0018] The beneficial effects of the technical solution provided by this invention include:

[0019] This invention provides a wear-resistant reverse idler gear structure. Because a gasket is provided between the idler gear and the housing, the idler gear will contact the gasket when moving instead of directly contacting the housing, thus avoiding direct wear of the housing by the idler gear. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional schematic diagram of a wear-resistant reverse idler gear structure provided in an embodiment of the present invention;

[0022] Figure 2 This is a partial three-dimensional structural diagram of a wear-resistant reverse idler gear structure provided in an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional schematic diagram of another wear-resistant reverse idler gear structure provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the forces acting on the idler wheel provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the idler wheel tipping over according to an embodiment of the present invention;

[0026] Figure 6 This is a front view schematic diagram of a gasket provided in an embodiment of the present invention;

[0027] Figure 7 A schematic diagram showing the center distance between the outer edge of the gasket and the main body provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the structure of a gasket that extends clockwise along an oil groove, as provided in an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of a gasket that extends counterclockwise along an oil groove, as provided in an embodiment of the present invention.

[0030] In the picture:

[0031] 1. Gasket; 11. Main body; 111. Inner hole; 12. Protrusion; 13. Oil groove; 131. Outer edge; 132. Inner edge;

[0032] 2. Housing; 21. Mounting cavity; 22. Mounting hole; 221. Bottom surface; 3. Idler wheel; 31. Needle roller;

[0033] 4. Axle; 41. First step; 42. Second step; 43. Through hole; 44. Countersunk groove; 45. Limiting groove;

[0034] 5. First bolt; 6. Second bolt; 7. Positioning plate; 8. Sealing ring; 9. Slot. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides a wear-resistant reverse idler gear structure, which can solve the problem in related technologies that when the end face gap between the idler gear and the housing is small and the radial clearance of the needle roller bearing is large, the end face of the housing is easily rubbed.

[0037] See Figure 1 and Figure 3 As shown, an embodiment of the present invention provides a wear-resistant reverse idler gear structure, which may include: a housing 2, the housing 2 having a mounting cavity 21 and a mounting hole 22, the mounting hole 22 communicating with 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, the mounting hole 22 may be a through hole or a blind hole; an idler gear 3, which can be installed in the mounting cavity 21, and at least one side of the idler gear 3 is provided with a gasket 1. A gasket 1 is sandwiched between the housing 2 and the idler wheel 3. Here, it can be understood that there may be a gap between the gasket 1 and the idler wheel 3 or there may be no gap. By setting the gasket 1, the idler wheel 3 can be separated from the housing 2, so that the idler wheel 3 does not directly contact the housing 2. The axle 4 can be installed in the mounting hole 22, and the axle 4 passes through the idler wheel 3. That is to say, there is a hole inside the idler wheel 3, and the axle 4 passes through the hole, so that the idler wheel 3 can rotate around the axis of the axle 4.

[0038] In this embodiment, since a gasket 1 is provided between the idler wheel 3 and the housing 2, the gasket 1 is sandwiched between the idler wheel 3 and the housing 2. When the idler wheel 3 is positioned with the gasket 1, it will contact the gasket 1 without directly contacting the housing 2, thereby avoiding the idler wheel 3 directly abrading the housing 2.

[0039] In some embodiments, see Figure 1 and Figure 2 As shown, the idler wheel 3 can have gaskets 1 on both opposite sides, meaning 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. The gaskets 1 can have the same or different shapes. Each gasket 1 can have a protrusion 12, and the housing 2 or the axle 4 has a groove 9 corresponding to the protrusion 12, with the protrusion 12 extending into the groove 9. In other words, the protrusion 12 on the gasket 1 can cooperate with either the housing 2 or the axle 4. Correspondingly, when the groove 9 is provided on the housing 2, the protrusion 12 cooperates with the groove 9 on the housing 2; when the groove 9 is provided on the axle 4, the protrusion 12 cooperates with the groove 9 on the axle 4. In this embodiment, it is preferable to provide the groove 9 on the housing 2 near the gasket 1. By providing the groove 9 to cooperate with the protrusion 12, the rotation of the gasket 1 relative to the housing 2 can be prevented, avoiding wear of the housing 2 by the gasket 1. This also simplifies the structure and improves reliability. The protrusion 12 can be a convex structure formed by the body 11 of the gasket 1 extending to one side, or it can be a barbed structure formed by tearing the body 11. In this embodiment, the protrusion 12 is preferably formed by tearing the body 11. This arrangement makes the protrusion 12 easy to form and does not generate excess waste.

[0040] Furthermore, when shims 1 are provided on both sides of the idler wheel 3, the thickness of the shims 1 is preferably less than 2 mm, and the shims 1 can be made of steel and have undergone heat treatment.

[0041] In some alternative embodiments, see Figure 3 As shown, the axle 4 may have a first step 41, which protrudes into the mounting cavity 21 along the axial direction of the axle 4. That is, the end face of the first step 41 extends beyond the inner wall of the mounting cavity 21, thus protruding into the interior of the mounting cavity 21. The first step 41 and the gasket 1 are located on opposite sides of the idler wheel 3. In this embodiment, since the first step 41 protrudes into the mounting cavity 21, the first step 41 is closer to the idler wheel 3 than the inner wall of the mounting cavity 21. That is, the left side of the idler wheel 3 faces the gasket 1, and the right side of the idler wheel 3 faces the first step 41. When the idler wheel 3 moves, it will preferentially contact the gasket 1 or the first step 41 that is closer to it, avoiding direct contact between the left and right sides of the idler wheel 3 and the housing 2, thus preventing wear on the housing 2.

[0042] Furthermore, in some embodiments, see [link to relevant documentation]. Figure 3As shown, the axle 4 may also have a second step 42, which abuts against one side of the gasket 1, clamping the gasket 1 between the housing 2 and the second step 42. That is, one side of the gasket 1 contacts the housing 2, and the other side of the gasket 1 contacts the second step 42. The second step 42 can clamp the gasket 1, preventing the gasket 1 from moving axially.

[0043] Further, see Figure 3 As shown, there may be a gap between the end face of the axle 4 and the bottom surface 221 of the mounting hole 22. In this embodiment, the mounting hole 22 can be a blind hole, that is, one end of the mounting hole 22 is connected to the outside, which facilitates the insertion of the axle 4 into the mounting hole 22. The other end of the mounting hole 22 does not penetrate the housing 2, so that the other end of the mounting hole 22 forms the bottom surface 221. When the axle 4 is installed in the mounting hole 22 and the second step 42 contacts the side of the gasket 1, the front end face of the axle 4 can form a gap with the bottom surface 221 of the mounting hole 22. That is, the front end face of the axle 4 does not contact the bottom surface 221 of the mounting hole 22, which ensures that the axle 4 presses the gasket 1 tightly, preventing the gasket 1 from moving axially and rotating. Furthermore, the clamping gap formed between the gasket 1 and the first step 41 is more reliable.

[0044] In some alternative embodiments, see Figure 3 As shown, the axle 4 may have a through hole 43 and a countersunk groove 44. The through hole 43 and the countersunk groove 44 are connected. The through hole 43 may extend along the axial direction of the axle 4, or it may extend radially along the axle 4, or it may extend obliquely within the axle 4. The countersunk groove 44 extends in the same direction as the through hole 43. The first bolt 5 can pass through the through hole 43 and be fixed to the housing 2, thereby axially limiting the axle 4. After passing through the through hole 43, the first bolt 5 can be threadedly connected to the housing 2, and the head of the first bolt 5 is located within the countersunk groove 44, thereby preventing the bolt head from protruding. In this embodiment, it is preferable that the through hole 43 extends along the axial direction of the axle 4, so that the through hole 43 can penetrate the axle 4 back and forth along the axial direction of the axle 4. The length of the through hole 43 is relatively long, and the first bolt 5 inserted in the through hole 43 can restrict the axle 4 at all points along the axial direction of the axle 4.

[0045] In some embodiments, see Figure 4 and Figure 5As 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 gasket 1 and the first step 41, the idler wheel 3 is located in the clamping gap, the width of the clamping gap is L1, the idler wheel 3 has a contact end that contacts the gasket 1 or the first step 41 (that is, the idler wheel 3 is at the left and right ends), the outer 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 radius of the contact end R, the radial clearance C of the needle roller 31, the width between the two opposite contact ends of the idler wheel 3 L2, and the length L3 of the needle roller 31.

[0046] Based on the positional relationship, we can obtain: tanα=C / L3, L4=R×tanα, L1 / 2=(L4+L2 / 2)×cosα, where α is the angle at which the idler wheel 3 rotates 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 gasket 1 or the end face of the first step 41 after the idler wheel 3 rotates. This distance is perpendicular to the end face of the idler wheel 3.

[0047] According to the above formula, we can obtain:

[0048] Because the radial clearance C is very small, Equation (1) can be rewritten as:

[0049]

[0050] Therefore, to ensure that the idler wheel 3 end face and the clamping end face do not squeeze after flipping, it is necessary to ensure that:

[0051]

[0052] At this point, the entire flipping torque is 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 still move axially with the bumps of the car and will also rub against the clamping end face. It is necessary to install wear-resistant parts to improve reliability.

[0053] In related technologies, the idler gear 3 is generally helical. When the helical idler gear 3 is working, it meshes with two gears simultaneously. The helical teeth are subjected to two axial forces Fa1 and Fa2, which are equal in magnitude and opposite in direction, forming a flipping torque. Due to the radial clearance C of the needle roller 31, the idler gear 3 is caused to flip relative to the needle roller 31 and the wheel axle 4 by a certain angle α. Since the idler gear 3 rotates relative to the wheel axle 4, the housing 2, and the gasket 1, related technologies generally consider that the end face clearance Δ between the idler gear 3 and the housing 2 is greater than 0, without considering the effect of the idler gear 3 flipping. However, in this embodiment, after designing the clamping clearance L1 through the above calculation, it can be ensured that the end face of the idler gear 3 and the clamping end face do not squeeze after flipping, effectively reducing wear. Based on the wear-resistant gasket 1 in this application, the end face clearance formula greatly improves the reliability and is applicable to the design and development of all similar structures such as the reverse idler gear of the gearbox, planetary gear, and power take-off idler gear.

[0054] Preferably, the axle 4 and the mounting hole 22 can be interference-fitted to prevent the axle 4 from rotating relative to the housing 2.

[0055] Further, see Figure 1 and Figure 3 As shown, the gasket 1 is sleeved on the outside of the axle 4, and the inner hole 111 of the gasket 1 and the outer circular surface of the axle 4 can be interference-fitted, thereby effectively preventing the gasket 1 from rotating relative to the housing 2.

[0056] In some embodiments, see Figure 1 As shown, the axle 4 may be provided with a limiting groove 45. A positioning plate 7 is inserted into the limiting groove 45 along the radial direction of the axle 4. The positioning plate 7 is installed on the housing 2 by a 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 housing 2 by the second bolt 6, thereby fixing the axle 4 to the housing 2 and preventing the axle 4 from moving axially.

[0057] The installation sequence of the idler wheel 3 structure in this embodiment can be as follows: During installation, place one of the gaskets 1, the idler wheel 3 and the needle roller 31 in the mounting cavity 21 in sequence, then insert the wheel axle 4 from the right end and press it to the left, and finally tighten the bolt. When the wheel axle 4 is pressed axially, the left end of the gasket 1 is close to the end face of the housing 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 mounting hole 22.

[0058] Furthermore, when the shim 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, both the wheel axle 4 and the shim 1 can be carburized and quenched with wear-resistant bearing steel GCr15, with a surface hardness greater than or equal to HRC60. To prevent brittleness after quenching, the thickness of the shim 1 is greater than or equal to 5mm.

[0059] Furthermore, a sealing ring 8 can be provided between the housing 2 and the axle 4 to prevent oil leakage.

[0060] See Figure 6 As shown, in some embodiments, the gasket 1 may include: a body 11 having an inner hole 111 for passing through the axle 4, and the body 11 having a protrusion 12 protruding from the surface of the body 11. The protrusion 12 may be a convex structure extending from the body 11 to one side, or a barb structure formed by tearing the body 11. In this embodiment, the protrusion 12 is preferably formed by tearing the body 11, which 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 housing 2 or the axle 4 so that the protrusion 12 is locked in the slot 9. The body 11 may also be provided with an oil groove 13 communicating with the inner hole 111, and the oil groove 13 extending from the outer edge to the inner edge of the body 11, so that lubricating oil can flow from the outer edge of the body 11 along the oil groove 13 all the way to the inner hole 111.

[0061] In this embodiment, since a protrusion 12 structure is provided on the main body 11, the gasket 1 can cooperate with the slot 9 of the housing 2 or the axle 4 during use, so that the protrusion 12 can be locked in the slot 9, which can keep the gasket 1 stationary relative to the housing 2, prevent the gasket 1 from rotating with the idler wheel 3, avoid the gasket 1 from wearing the housing 2, and the oil groove 13 provided on the main body 11 facilitates oil inlet, lubricating the gasket 1 and the needle roller 31 inside the idler wheel 3, further reducing friction and improving reliability.

[0062] Furthermore, the thickness of the gasket 1 is preferably 1.5 to 2 mm, and it is made of cold-rolled 08 steel strip and soft nitriding treatment, with a surface hardness of up to HV450.

[0063] Preferred, see Figure 6 and Figure 7 As shown, the oil groove 13 is tangent to the inner hole 111. The oil inlet of the oil groove 13 is tangent to the oil flow direction, and the oil outlet is tangent to the edge of the inner hole 111. This allows the lubricating oil to continue flowing forward along its original flow direction within the oil groove 13 when entering the inner hole 111. In other words, after exiting the oil groove 13, the lubricating oil can flow smoothly along the inner wall of the inner hole 111. This design minimizes the impact resistance from the wheel axle 4 during the process of the lubricating oil entering the inner hole 111 from the oil groove 13, ensuring smooth lubrication of the inner hole 111.

[0064] In some embodiments, see Figure 6 , Figure 8 and Figure 9As shown, when the idler wheel 3 rotates relative to the gasket 1 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. Specifically, assuming the idler wheel 3 rotates clockwise relative to the gasket 1, the oil groove 13 can be designed as a clockwise spiral structure, meaning the oil groove 13 extends from the outer edge of the main body 11 in a clockwise direction to the inner edge of the main body 11. This ensures reliable introduction of lubricating oil into the inner hole 111 and lubrication along the rotation direction of the idler wheel 3. Lubrication along the rotation direction of the idler wheel 3 is more effective than lubrication against the rotation direction of the idler wheel 3. Conversely, when the idler wheel 3 rotates counterclockwise relative to the gasket 1, the oil groove 13 can be designed as a counterclockwise spiral structure, meaning the oil groove 13 extends from the outer edge of the main body 11 in a counterclockwise direction to the inner edge of the main body 11.

[0065] Furthermore, one side of the gasket 1 can be provided with multiple oil grooves 13. For ease of processing, each oil groove 13 is preferably a quarter-circle 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 also ensure that the lubricating oil is smoothly introduced into the inner hole 111. In this embodiment, the gasket 1 is provided with 4 evenly distributed oil grooves 13 to ensure uniform oil intake and processing efficiency.

[0066] See Figure 7 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 annular shapes according to actual needs. The oil groove 13 has an outer arc-shaped outer edge 131 and an inner arc-shaped inner edge 132; the center o2 of the outer edge 131 and the center o1 of the main body 11 have a center distance. Distance between centers The radius of the outer circle r1 of the main body 11 and the inner diameter r2 of the inner hole 111 can be determined based on these parameters. Assuming the radius of the outer edge 131 is x, then:

[0067] Distance between centers According to trigonometric relationships, we have: r1 2 =x 2 +(x-r2) 2 We can obtain:

[0068]

[0069]

[0070] 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 of the circle can be slightly larger than the calculated distance between the centers. The value is used to prevent the inner hole 111 from having a sharp point after machining. In practice, the distance between the center o2 and the center o1 can be 0.5 to 1 mm larger than the calculated value.

[0071] Furthermore, the inner edge of the oil groove 13 can be parallel to the outer edge, the distance between the inner edge and the outer edge is preferably greater than 2mm, and the groove depth of the oil groove 13 is preferably greater than or equal to 0.5mm and less than or equal to half the thickness of the gasket 1, so as to facilitate the flow of lubricating oil.

[0072] Preferably, when the oil groove 13 on the gasket 1 extends counterclockwise, all other parameters and calculation methods can be the same except that the extension direction of the oil groove 13 is opposite to the extension direction of the oil groove 13 on the gasket 1 when it is clockwise. At the same time, when installing gaskets 1 with different rotation directions, care should be taken to ensure that the installation position of the gasket 1 is not reversed.

[0073] This application embodiment designs a spiral oil groove 13 adapted to the flow of lubricating oil and a parameter definition formula, which enables the gasket 1 and the needle roller 31 to be well lubricated. The gasket 1 is installed in pairs according to the direction of rotation to ensure that oil can enter from both the left and right ends of the idler wheel 3, increasing the lubrication flow and ensuring sufficient lubrication. Moreover, one gasket 1 is equipped with four oil grooves 13. The use of finished steel strip and soft nitriding process results in good wear resistance, low price, and easy processing. It also solves the problems of wear on the end face of the idler wheel 3 and insufficient lubrication of the needle roller 31, which is simple and efficient.

[0074] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0075] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the 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 invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A wear-resistant reverse idler structure, characterized in that, It includes: The shell (2) has a mounting cavity (21), and the shell (2) has a mounting hole (22) which communicates with the mounting cavity (21); The idler (3) is installed in the mounting cavity (21), and at least one side of the idler (3) is provided with a gasket (1) clamped between the shell (2) and the idler (3); The axle (4) is installed in the mounting hole (22), and the axle (4) penetrates the idler (3), and the idler (3) can rotate around the axis of the axle (4); The axle (4) has a first step (41) which protrudes into the mounting cavity (21) along the axial direction of the axle (4), and the first step (41) is located on the opposite sides of the idler (3) respectively. The gasket (1) and the first step (41) form a clamping gap, the width of the clamping gap is The idler gear (3) has a contact end in contact with the gasket (1) or the first step (41), the outer circle radius of the contact end is The width between the two contact ends of the idler gear (3) is And the idler gear (3) and the wheel shaft (4) are provided with a needle roller (31); The clamping gap is determined depending on the outer radius of the contact end , the radial play of the needle roller (31) , the width between the two contact ends of the idler gear (3) , and the length of the needle roller (31) . 。 2. The wear-resistant reverse idler structure according to claim 1, wherein: The opposite sides of the idler (3) are provided with the gasket (1), the gasket (1) is provided with a protrusion (12), and the shell (2) or the axle (4) is provided with a clamping groove (9) corresponding to the protrusion (12), and the protrusion (12) protrudes into the clamping groove (9).

3. The wear-resistant reverse idler structure according to claim 1, wherein: The axle (4) has a second step (42) which abuts on one side of the gasket (1), so that the gasket (1) is clamped between the shell (2) and the second step (42).

4. The wear-resistant reverse idler structure of claim 3, wherein: There is a gap between the end face of the axle (4) and the bottom face (221) of the mounting hole (22).

5. The wear-resistant reverse idler structure according to claim 1 or 2, wherein: A through hole (43) and a countersunk groove (44) are formed in the axle (4), and the through hole (43) communicates with the countersunk groove (44); A first bolt (5) penetrates the through hole (43) and is fixed to the shell (2), and the head of the first bolt (5) is located in the countersunk groove (44).

6. The wear-resistant reverse idler structure of claim 1, wherein: The axle (4) and the mounting hole (22) are in interference fit.

7. The wear-resistant reverse idler structure according to claim 1, wherein: The gasket (1) is sleeved outside the axle (4), and the inner hole of the gasket (1) is in interference fit with the outer cylindrical surface of the axle (4).

8. The wear-resistant reverse idler structure according to claim 1, wherein: The axle (4) is provided with a limiting groove (45), a positioning plate (7) is inserted in the limiting groove (45) along the radial direction of the axle (4), and the positioning plate (7) is installed on the shell (2) by a second bolt (6).

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