A pin gear housing and RV reducer

Abstract

The present invention relates to a motor, and in particular to a pinion housing and an RV reducer. The pinion housing is used for an RV reducer, wherein the pinion housing is formed with a mounting hole, and a pinion hole is formed on the inner side wall of the mounting hole. An oil storage position is formed on the inner side wall of the pinion hole, and in the circumferential direction of the pinion hole, a first meshing position for meshing with a pinion pin is formed on one side of the oil storage position, and a second meshing position for meshing with the pinion pin is formed on the other side. This achieves the purpose of ensuring uniform force between the pinion pin and the pinion hole and improving lubricity.

Description

Technical Field

[0001] The present invention relates to a motor, and in particular to a pinion gear housing and an RV reducer. Background Art

[0002] The RV reducer is one of the core components of robot transmission. Compared with other reduction methods, the RV reducer has the advantages of large reduction ratio, coaxial transmission, high transmission accuracy, high rigidity, large load capacity, and compact structure. It is widely used in industries such as aerospace and robotics. In the existing technical solution, the pin and the pinhole are matched in the form of a cylinder and a semi-mounting hole. The diameter of the semi-mounting hole is slightly larger than the diameter of the pin. The pin forms a line contact with the inner surface of the semi-mounting hole within the semi-mounting hole, or forms a small area of ​​surface contact under the deformation of the pin and the pinhole. When squeezed, stress concentration occurs between the pin and the pinhole, which not only shortens the service life of the structure itself, but also accelerates wear. Due to the small stress area, the lubricant between the pin and the pinhole is squeezed, and the area with the greatest stress has very little lubricant, which causes faster wear, generates unnecessary vibration and noise, and reduces the service life of the RV reducer.

[0003] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0004] In order to ensure uniform force between the needle tooth pin and the needle tooth hole and improve lubricity, the present invention proposes a needle tooth housing and an RV reducer.

[0005] In one aspect, the present invention provides a pin gear housing for an RV reducer, wherein the pin gear housing is formed with a mounting hole, and a pin gear hole is formed on an inner side wall of the mounting hole;

[0006] An oil storage position is formed on the inner wall surface of the needle tooth hole. In the circumferential direction of the needle tooth hole, a first engaging position engaged with the needle tooth pin is formed on one side of the oil storage position, and a second engaging position engaged with the needle tooth pin is formed on the other side.

[0007] Preferably, the length direction of the oil storage tank is parallel to the axial direction of the needle tooth hole, and the length of the oil storage tank is equal to the axial length of the needle tooth hole.

[0008] Preferably, along the circumference of the needle-tooth hole, the inner side wall of the needle-tooth hole includes a first circumferential segment, a third circumferential segment and a second circumferential segment arranged in sequence; the first circumferential segment is connected to the third circumferential segment via a first transition connection end, and the second circumferential segment is connected to the third circumferential segment via a second transition connection end; the third circumferential segment is recessed to form an oil storage tank; the oil storage position includes the oil storage tank, the first circumferential segment is provided with the first meshing position, and the second circumferential segment is provided with a second meshing position.

[0009] Preferably, the oil storage tank includes a bottom surface and two opposite connecting surfaces, wherein the first connecting surface is connected to the first peripheral segment via a first convex arc surface, and the first connecting surface is connected to the bottom surface via a first concave arc surface;

[0010] The second connecting surface is connected to the second peripheral segment via a second convex arc surface; the second connecting surface is connected to the bottom surface via a second concave arc surface;

[0011] The first transition connecting section includes the first concave arc surface, the first connecting surface and the first convex arc surface; the second transition connecting section includes the second concave arc surface, the second connecting surface and the second convex arc surface.

[0012] Preferably, in a cross section perpendicular to the axis of the needle tooth housing, the angle between the lines connecting the circumferential end points of the bottom surface of the oil storage tank and the center of the needle tooth hole is γ, satisfying 0≤γ≤π / 4.

[0013] Preferably, the bottom surface of the oil storage tank is an arc surface, the axis of the arc surface coincides with the axis of the needle tooth housing, the diameter of the arc surface is D1, the top diameter of the needle tooth hole is D2, 0.05d<(D1-D2)<0.1d, d is the base circle diameter of the needle tooth hole.

[0014] Preferably, a plane passing through the axis of the mounting hole and the center line of the needle tooth hole is used as a reference plane; the first circumference segment and the second circumference segment are symmetrical about the reference plane; and the oil storage tank is symmetrical about the symmetry plane.

[0015] Preferably, the first circumferential segment includes a first mating surface and lubricating surfaces located on both sides of the first mating surface in the circumferential direction, the lubricating surfaces including a first lubricating surface A close to the oil storage tank and a first lubricating surface B away from the oil storage tank; the first mating surface contacts the outer circumferential surface of the needle tooth pin, a first lubricating cavity A is formed between the first lubricating surface A and the outer circumferential surface of the needle tooth pin, and a first lubricating cavity B is formed between the first lubricating surface B and the outer circumferential surface of the needle tooth pin; the rotation of the needle tooth pin can drive the lubricating oil in the oil storage tank into the first lubricating cavity A and the first lubricating cavity B, and a lubricating oil film is formed between the first mating surface and the outer circumferential surface of the needle tooth pin; and / or,

[0016] The second circumferential segment includes a second mating surface and lubricating surfaces located on both sides of the second mating surface, and the lubricating surfaces include a second lubricating surface A close to the oil storage tank and a second lubricating surface B away from the oil storage tank; the second mating surface contacts the outer cylindrical surface of the needle tooth pin, and a second lubricating cavity A is formed between the second lubricating surface A and the outer cylindrical surface of the needle tooth pin, and a second lubricating cavity B is formed between the second lubricating surface B and the outer cylindrical surface of the needle tooth pin; the rotation of the needle tooth pin can drive the lubricating oil in the oil storage tank into the second lubricating cavity A and the second lubricating cavity B, and a lubricating oil film is formed between the second mating surface and the outer cylindrical surface of the needle tooth pin.

[0017] Preferably, on a cross section perpendicular to the axis of the needle tooth hole, the intersection of the cross section and the axis of the needle tooth hole is point O, and the ray extending from point O to the center point of the oil storage tank is OX;

[0018] With point O as the pole and ray OX as the polar axis, polar coordinates are established. The curve equation of the first segment is:

[0019] ρ=0.5d+fcos(2α),

[0020] The curve equation of the second segment is:

[0021] ρ=0.5d+fcos(2α), d is the base circle diameter of the needle tooth hole, f is the deformation coefficient relative to the base circle, 0.0003d<f<0.001d.

[0022] Preferably, the diameter d1 of the needle tooth pin has a value range of:

[0023]

[0024] 0.0003d<f<0.001d, f is the deformation coefficient relative to the base circle, and d is the base circle diameter of the needle tooth hole.

[0025] On the other hand, the present invention also provides an RV reducer, including the needle tooth housing; the inner wall surface of the mounting hole of the needle tooth housing is evenly formed with a plurality of needle tooth holes along the circumferential direction, and each needle tooth hole is provided with a needle tooth pin, and the needle tooth pin is engaged with the needle tooth hole through the first meshing position and the second meshing position in the needle tooth hole.

[0026] In one aspect, the present invention provides a pin gear housing for an RV reducer, wherein the pin gear housing is formed with a mounting hole, and a pin gear hole is formed on an inner side wall of the mounting hole, wherein the axial direction of the pin gear hole is parallel to the axial direction of the mounting hole;

[0027] An oil storage groove is formed on the inner wall surface of the needle tooth hole, and the oil storage groove is used to store lubricating oil.

[0028] Preferably, the inner side wall of the needle-tooth hole is recessed radially outward of the needle-tooth hole to form the oil storage groove; and the length direction of the oil storage groove is parallel to the axial direction of the needle-tooth hole.

[0029] Preferably, the length of the oil storage tank is equal to the axial length of the needle tooth hole.

[0030] Preferably, on a cross section of the needle tooth housing, the angle between the lines connecting the circumferential end points of the oil storage groove and the center of the needle tooth hole is γ, satisfying 0≤γ≤π / 4.

[0031] Preferably, a needle tooth pin is provided in the needle tooth hole; along the circumference of the needle tooth hole, the inner side wall of the needle tooth hole includes a first circumferential segment, a third circumferential segment and a second circumferential segment arranged in sequence, and the third circumferential segment is recessed toward the radial outside of the needle tooth hole to form the oil storage groove; the first circumferential segment and the second circumferential segment are used to cooperate with the needle tooth pin.

[0032] Preferably, the third segment is arc-shaped, the diameter of the third segment is D1, and the top diameter of the needle tooth hole is D2.

[0033] 0.05d<(D1-D2)<0.1d, d is the base circle diameter.

[0034] Preferably, a symmetry plane is formed through the axis of the mounting hole and the center line of the needle tooth hole; the first circumference segment and the second circumference segment are symmetrical about the symmetry plane; and the oil storage tank is symmetrical about the symmetry plane.

[0035] Preferably, the first circumferential segment includes a first mating surface and lubricating surfaces located on both sides of the first mating surface in the circumferential direction, the lubricating surfaces including a first lubricating surface A close to the oil storage tank and a first lubricating surface B away from the oil storage tank; the first mating surface contacts the outer circumferential surface of the needle tooth pin, a first lubricating cavity A is formed between the first lubricating surface A and the outer circumferential surface of the needle tooth pin, and a first lubricating cavity B is formed between the first lubricating surface B and the outer circumferential surface of the needle tooth pin; the rotation of the needle tooth pin can drive the lubricating oil in the oil storage tank into the first lubricating cavity A and the first lubricating cavity B, and a lubricating oil film is formed between the first mating surface and the outer circumferential surface of the needle tooth pin; and / or,

[0036] The second circumferential segment includes a second mating surface and lubricating surfaces located on both sides of the second mating surface, and the lubricating surfaces include a second lubricating surface A close to the oil storage tank and a second lubricating surface B away from the oil storage tank; the second mating surface contacts the outer cylindrical surface of the needle tooth pin, and a second lubricating cavity A is formed between the second lubricating surface A and the outer cylindrical surface of the needle tooth pin, and a second lubricating cavity B is formed between the second lubricating surface B and the outer cylindrical surface of the needle tooth pin; the rotation of the needle tooth pin can drive the lubricating oil in the oil storage tank into the second lubricating cavity A and the second lubricating cavity B, and a lubricating oil film is formed between the second mating surface and the outer cylindrical surface of the needle tooth pin.

[0037] Preferably, on a cross section of the needle tooth housing, the intersection of the cross section and the center line of the needle tooth hole is point O, and the ray extending from point O to the center point of the oil storage tank is OX;

[0038] With point O as the pole and ray OX as the polar axis, polar coordinates are established. The curve equation of the first segment is:

[0039] ρ=0.5d+fcos(2α),

[0040] The curve equation of the second segment is:

[0041] ρ=0.5d+fcos(2α), d is the base circle diameter, f is the deformation coefficient relative to the base circle, 0.0003d<f<0.001d.

[0042] Preferably, the diameter d1 of the needle tooth pin has a value range of:

[0043]

[0044] 0.0003d<f<0.001d, f is the deformation coefficient relative to the base circle, and d is the base circle diameter.

[0045] On the other hand, the present invention also provides an RV reducer including the pin gear housing.

[0046] The present invention provides an oil storage tank, a first mating surface and a second mating surface in the needle tooth hole. When the needle tooth pin rotates, the lubricating oil in the oil storage tank is driven to lubricate the outer cylindrical surface of the needle tooth pin, thereby improving the lubrication effect. A lubrication cavity is formed between the outer cylindrical surface of the needle tooth pin and the lubricating surfaces on both sides of the first mating surface, and a lubrication cavity is formed between the outer cylindrical surface of the needle tooth pin and the lubricating surfaces on both sides of the second mating surface. When the needle tooth pin rotates under load, the lubricating oil in the lubrication cavity can not only lubricate the outer cylindrical surface of the needle tooth pin, but also have a certain vibration reduction effect on the needle tooth pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is an axial schematic diagram of a pinion housing according to an embodiment of the present invention;

[0048] Figure 2 This is a radial cross-sectional view of a pin gear housing according to an embodiment of the present invention;

[0049] Figure 3 For the embodiment of the present invention Figure 1 Enlarged view of point A in the middle;

[0050] Figure 4 This is an enlarged view of the oil storage tank according to an embodiment of the present invention;

[0051] Figure 5 Schematic diagram of the projection profile of the pinhole axis in polar coordinates according to an embodiment of the present invention;

[0052] Figure 6 This is an axial schematic diagram of a needle tooth pin in a needle tooth hole according to an embodiment of the present invention;

[0053] Figure 7 For the embodiment of the present invention Figure 6 Enlarged view of point B in the middle;

[0054] Figure 8 This is a schematic diagram of a pin tooth pin according to an embodiment of the present invention;

[0055] Figure 9 This is a schematic diagram of a needle tooth pin and a needle tooth housing assembled together according to an embodiment of the present invention;

[0056] Figure 10 This is an exploded view of the RV reducer according to an embodiment of the present invention;

[0057] Figure 11 This is a perspective view of an RV reducer according to an embodiment of the present invention;

[0058] Figure 12 This is a radial schematic diagram of an RV reducer according to an embodiment of the present invention;

[0059] Figure 13 This is a radial cross-sectional view of the RV reducer according to an embodiment of the present invention.

[0060] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0061] In the accompanying drawings: 1-needle gear housing body; 2-needle gear housing; 3-needle gear pin; 4-oil storage tank; 501-first lubrication surface A; 502-first lubrication surface B; 503-first mating surface; 601-second lubrication surface A; 602-second lubrication surface B; 603-second mating surface; 401-first side surface; 402-second side surface; 403-bottom surface; 4011-first convex arc surface; 4012-first concave arc surface; 4021-second convex arc surface; 4022-second concave arc surface; 701-first lubrication cavity A; 702-first lubrication cavity B; 801-second lubrication cavity A; 802-second lubrication cavity B. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the solutions of the present invention, 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 embodiments described are only 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 should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms "first," "second," and so on, in the present description, claims, and drawings are used to distinguish similar items and are not necessarily used to describe a specific order or precedence; "front end" and "back end" are relative. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0064] The present invention relates to a motor, and in particular to a pinion housing and an RV reducer. The RV reducer is one of the core components of a robot transmission. Compared with other reduction methods, the RV reducer has the advantages of a large reduction ratio, coaxial transmission, high transmission accuracy, high rigidity, large load capacity, and compact structure, and is widely used in industries such as aerospace and robotics. In the existing technical solution, the pinion pin and the pinion hole are in the form of a cylinder and a semi-mounting hole, and the diameter of the semi-mounting hole is slightly larger than the diameter of the pinion pin. The pinion pin forms a line contact with the inner surface of the semi-mounting hole in the semi-mounting hole, or forms a small area of ​​surface contact under the deformation of the pinion pin and the pinion hole. When squeezed, stress concentration occurs between the pinion pin and the pinion hole, which not only accelerates the working life of the structure itself, but also accelerates wear. Due to the small force area, the lubricating oil between the pinion pin and the pinion hole is squeezed, and the area with the greatest force has very little lubricating oil, which makes the wear faster, generates unnecessary vibration and noise, and reduces the service life of the RV reducer.

[0065] In view of the above problems, the present invention proposes a pinion gear housing and an RV reducer.

[0066] On the one hand, if Figure 1-12 As shown, a pinion housing 1 is used for an RV reducer. The pinion housing 1 is formed with a mounting hole, and a pinion hole 2 is formed on the inner wall of the mounting hole; an oil storage position is formed on the inner wall of the pinion hole 2, and in the circumferential direction of the pinion hole 2, a first engaging position for engaging with the pinion pin 3 is formed on one side of the oil storage position, and a second engaging position for engaging with the pinion pin 3 is formed on the other side.

[0067] When the needle pin 3 rotates, it drives the lubricating oil in the oil storage tank 4 into the needle hole 2, lubricating the outer cylindrical surface of the needle pin 3 in the needle hole 2; the lubricating oil can not only reduce the friction between the needle pin 3 and the needle housing 1, but also exchange heat with the needle pin 3, thereby reducing the temperature of the needle pin 3; the needle pin 3 and the needle hole 2 cooperate with each other through the first meshing position and the second meshing position, thereby reducing the concentrated stress of the needle pin 3 and making the force on the needle pin 3 more balanced; the meshing here refers to the cooperation relationship between two different components, including the contact and offset between the two surfaces, and is not limited to the staggered cooperation similar to that between gear teeth.

[0068] Preferably, Figure 3 Figure 4 Figure 8 As shown, the length direction of the oil storage groove 4 is parallel to the axial direction of the needle tooth hole 2, and the length of the oil storage groove 4 is equal to the axial length of the needle tooth hole 2.

[0069] The oil storage tank 4 is parallel to the needle tooth hole 2 in the length direction and is equal to the length of the needle tooth hole 2. When the needle tooth pin 3 rotates, the lubricating oil in the oil storage tank 4 can be brought into the space between the needle tooth pin 3 and the needle tooth hole 2, and the needle tooth pin 3 can be lubricated over a large area in the axial direction, thereby improving the lubrication effect.

[0070] Preferably, along the circumference of the needle tooth hole 2, the inner side wall of the needle tooth hole 2 includes a first circumferential segment, a third circumferential segment and a second circumferential segment arranged in sequence; the first circumferential segment and the third circumferential segment are connected via a first transition connection end, and the second circumferential segment and the third circumferential segment are connected via a second transition connection end; the third circumferential segment is recessed to form an oil storage tank 4; the oil storage position includes the oil storage tank 4, the first circumferential segment is provided with a first meshing position, and the second circumferential segment is provided with a second meshing position.

[0071] The area where the needle pin 3 and the needle hole 2 contact each other is divided into a first segment and a second segment, which reduces the area of ​​a single continuous surface of the inner surface of the needle hole 2, which is beneficial to the cooperation between the needle pin 3 and the inner surface of the needle hole 2. When the needle pin 3 is in contact with the first segment and the second segment, the running-in between the needle pin 3 and the needle hole 2 is easier. The running-in here is the running-in before normal operation, and lubricating oil is not added temporarily. After the running-in, the outer cylindrical surface of the needle pin 3 and the surface of the load-bearing area fit better with each other, which is beneficial to improve the load-bearing capacity of the needle pin 3, reduce vibration, and reduce noise; after adding lubricating oil, the needle pin 3 rotates forward or reverse to drive the lubricating oil into the load-bearing area to lubricate the needle pin 3 and the load-bearing area.

[0072] Preferably, the oil storage tank 4 includes a bottom surface 403 and two opposite connecting surfaces, wherein the first connecting surface 401 is connected to the first peripheral segment via a first convex arc surface 4011, and the first connecting surface 401 is connected to the bottom surface 403 via a first concave arc surface 4012; the second connecting surface 402 is connected to the second peripheral segment via a second convex arc surface 4021; the second connecting surface 402 is connected to the bottom surface 403 via a second concave arc surface 4022; the first transition connecting section includes the first concave arc surface 4012, the first connecting surface 401 and the first convex arc surface 4011; the second transition connecting section includes the second concave arc surface 4022, the second connecting surface 402 and the second convex arc surface 4021.

[0073] The first connecting section and the second connecting section increase the speed at which the lubricating oil flows from the oil storage tank 4 to the lubricating cavity, reduce the obstruction to the lubricating oil, and reduce the stress at the transition connection.

[0074] Preferably, in a cross section perpendicular to the axis of the needle tooth housing 1 , the angle between the lines connecting the circumferential end points of the bottom surface 403 of the oil storage tank 4 and the center of the needle tooth hole 2 is γ, satisfying 0≤γ≤π / 4.

[0075] By controlling the size of the arc surface γ, and then controlling the circumferential size of the arc surface, that is, the circumferential width of the oil storage tank 4, the width of the oil storage tank 4 is effectively guaranteed, and the storage amount of lubricating oil is guaranteed; further, the γ value can be taken as π / 8<γ<π / 4; the oil storage tank 4 is symmetrical about the base surface.

[0076] Preferably, the bottom surface 403 of the oil storage tank 4 is an arc surface, the axis of the arc surface coincides with the axis of the needle tooth housing 1, the diameter of the arc surface is D1, the top diameter of the needle tooth hole 2 is D2, 0.05d<(D1-D2)<0.1d, d is the base circle diameter of the needle tooth hole 2.

[0077] The depth of the oil storage tank 4 is related to the diameter of the needle pin 3. The larger the diameter of the needle pin 3, the deeper the oil storage tank 4. This equation is suitable for different needle holes 2 and needle pins 3 and has high applicability.

[0078] Preferably, the plane passing through the axis of the mounting hole and the center line of the needle tooth hole 2 is used as the reference plane; the first circumference segment and the second circumference segment are symmetrical about the reference plane; and the oil storage tank 4 is symmetrical about the symmetry plane.

[0079] The first segment and the second segment are symmetrically arranged about the symmetry plane, which is conducive to making the force between the needle pin 3 and the needle hole 2 more balanced. Regardless of whether the needle pin 3 rotates forward or backward, the force between the needle pin 3 and the needle hole 2 can be stable, and the lubricating oil in the oil storage tank 4 can be effectively brought to the first segment and the second segment.

[0080] Preferably, Figure 3 Figure 5 Figure 6 As shown, the first circumference includes a first mating surface 503 and lubricating surfaces on both sides of the first mating surface 503, and the lubricating surfaces include a first lubricating surface A501 close to the oil storage tank 4 and a first lubricating surface B502 away from the oil storage tank 4; the first mating surface 503 contacts the outer cylindrical surface of the needle tooth pin 3, and a first lubricating cavity A701 is formed between the first lubricating surface A501 and the outer cylindrical surface of the needle tooth pin 3, and a first lubricating cavity B702 is formed between the first lubricating surface B502 and the outer cylindrical surface of the needle tooth pin 3; the rotation of the needle tooth pin 3 can drive the lubricating oil in the oil storage tank 4 to enter the first lubricating cavity A701 and the first lubricating cavity B702, and a lubricating cavity is formed between the first mating surface 503 and the outer cylindrical surface of the needle tooth pin 3. film; the second circumference includes a second mating surface 603 and lubricating surfaces on both sides of the second mating surface 603, and the lubricating surfaces include a second lubricating surface A601 close to the oil storage tank 4 and a second lubricating surface B602 away from the oil storage tank 4; the second mating surface 603 contacts the outer cylindrical surface of the needle tooth pin 3, and a second lubricating cavity A801 ​​is formed between the second lubricating surface A601 and the outer cylindrical surface of the needle tooth pin 3, and a second lubricating cavity B802 is formed between the second lubricating surface B602 and the outer cylindrical surface of the needle tooth pin 3; the rotation of the needle tooth pin 3 can drive the lubricating oil in the oil storage tank 4 to enter the second lubricating cavity A801 ​​and the second lubricating cavity B802, and a lubricating oil film is formed between the second mating surface 603 and the outer cylindrical surface of the needle tooth pin 3.

[0081] The rotation of the needle pin 3 drives the lubricating oil in the oil storage tank 4 to first enter the first lubrication cavity A701, and then forms a lubricating oil film between the needle pin 3 and the first mating surface 503 to flow to the first lubrication cavity B702; the lubricating oil in the first lubrication cavity A701 and the first lubrication cavity B702 increases the contact area between the needle pin 3 and the lubricating oil, thereby improving the heat dissipation and lubrication effects.

[0082] Preferably, Figure 4As shown, on a cross section perpendicular to the axis of the pinion housing 1, the intersection of the cross section and the axis of the pinion hole 2 is point O, and the ray extending from point O to the center point of the oil storage tank 4 is OX; polar coordinates are established with point O as the pole and ray OX as the polar axis. The equation for the projection of the first arc surface in the axial direction is:

[0083] ρ=0.5d+fcos(2α), The equation for the projection of the second arc surface in the axial direction is: ρ = 0.5d + fcos(2α), d is the base circle diameter of the needle tooth hole 2, f is the deformation coefficient relative to the base circle, 0.0003d<f<0.001d.

[0084] By limiting the axial projection of the first arc surface through the equation, the circumferential extension of the arc surface is also limited. When the first arc surface of this shape cooperates with the outer circumferential surface of the pin 3, a wedge-shaped lubrication cavity is formed at the first lubrication surface A501 and the first lubrication surface B502. When the pin 3 rotates, the lubrication area not only lubricates the pin 3 and the first mating surface 503, but also allows lubricating oil to more easily enter the lubrication cavity from the lubrication cavity to form a lubricating oil film between the pin 3 and the first mating surface 503. When the pin 3 rotates, the lubricating oil in the lubrication cavity can absorb some of the energy, providing a certain vibration reduction effect on the pin 3. The second arc surface cooperates with the pin 3 to achieve the same effect.

[0085] Preferably, Figure 7 As shown, the diameter d1 of the needle tooth pin 3 has a value range of:

[0086] d is the base circle diameter of the needle tooth hole 2, f is the deformation coefficient relative to the base circle, 0.0003d<f<0.001d.

[0087] The needle pin 3 that conforms to the equation is placed in the needle hole 2, which further increases the rate at which the lubricating oil flows from the first lubrication cavity to the bearing surface between the mating surface and the outer cylindrical surface of the needle pin 3, increases the flow speed of the lubricating oil, and further improves the lubrication effect and the cooling and heat dissipation effect.

[0088] On the other hand, Figure 9-12 As shown, the present invention also provides an RV reducer, including a pinion housing 1, wherein the inner wall surface of the mounting hole of the pinion housing 1 is evenly formed with a plurality of pinion holes 2 along the circumferential direction, and a pinion pin 3 is provided in each pinion hole 2, and the pinion pin 3 is engaged with the pinion hole 2 through a first meshing position and a second meshing position in the pinion hole 2.

[0089] When the RV reducer is working, the pinion pin 3 rotates forward in the pinion hole 2 and generates an extrusion force on the inner wall surface of the pinion hole 2. The pinion pin 3 is located in the pinion hole 2 through the first meshing position and the second meshing position. The lubricating oil in the oil reservoir 4 is driven to the first lubrication chamber A701 by the rotation of the pinion pin 3. Since the first lubrication chamber A701 is a wedge-shaped structure, the rotation of the pinion pin 3 produces an extrusion and carrying effect on the lubricating oil in the first lubrication chamber A701, causing the lubricating oil to enter the first meshing position to form an oil film at the first meshing position, thereby lubricating the pinion pin 3. The lubricating oil enters the first lubrication chamber B702 through the first meshing position due to the action and heat absorption effect; when the needle pin 3 rotates in the opposite direction, the needle pin 3 brings the lubricating oil in the oil storage tank 4 into the second lubrication chamber A801 ​​and the second meshing position, and brings the lubricating oil in the first lubrication chamber B702 into the first meshing position, thereby lubricating the outer cylindrical surface of the needle pin 3; the wedge-shaped structure can make the lubricating oil enter the meshing position faster, and at the same time, the lubricating oil in the wedge-shaped structure has a certain buffering effect on the vibration of the needle pin 3, thereby reducing the vibration of the RV reducer and correspondingly reducing the noise.

[0090] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included within the spirit and scope of the appended claims.

Claims

1. A pin gear housing for an RV reducer, characterized in that: The needle tooth housing is formed with a mounting hole, and the inner side wall of the mounting hole is formed with a needle tooth hole; An oil storage position is formed on the inner wall surface of the needle tooth hole, and a first meshing position engaged with the needle tooth pin is formed on one side of the oil storage position in the circumferential direction of the needle tooth hole, and a second meshing position engaged with the needle tooth pin is formed on the other side; The diameter d1 of the needle tooth pin has a value range of: 0.5 (0.5df) + 0.5 <d1<0.5df 0.0003d<f<0.001d, f is the deformation coefficient relative to the base circle, and d is the base circle diameter of the needle tooth hole.

2. The needle tooth housing according to claim 1, characterized in that: Along the circumference of the needle-tooth hole, the inner side wall of the needle-tooth hole includes a first circumferential segment, a third circumferential segment and a second circumferential segment arranged in sequence; the first circumferential segment is connected to the third circumferential segment via a first transition connecting segment, and the second circumferential segment is connected to the third circumferential segment via a second transition connecting segment; the third circumferential segment is recessed to form an oil storage tank; the oil storage position includes the oil storage tank, the first circumferential segment is provided with the first meshing position, and the second circumferential segment is provided with a second meshing position.

3. The needle tooth housing according to claim 2, characterized in that: The length direction of the oil storage groove is parallel to the axial direction of the needle tooth hole, and the length of the oil storage groove is equal to the axial length of the needle tooth hole.

4. The needle tooth housing according to claim 3, characterized in that: The oil storage tank includes a bottom surface and two opposite connecting surfaces, wherein the first connecting surface is connected to the first peripheral segment via a first convex arc surface, and the first connecting surface is connected to the bottom surface via a first concave arc surface; The second connecting surface is connected to the second peripheral segment via a second convex arc surface; the second connecting surface is connected to the bottom surface via a second concave arc surface; The first transition connecting section includes the first concave arc surface, the first connecting surface and the first convex arc surface; the second transition connecting section includes the second concave arc surface, the second connecting surface and the second convex arc surface.

5. The needle tooth housing according to claim 4, characterized in that: In a cross section perpendicular to the axis of the needle housing, the angle between the two end points of the bottom surface of the oil storage tank and the center of the needle hole is γ. Satisfies 0≤γ≤π / 4.

6. The needle tooth housing according to claim 5, characterized in that: The bottom surface of the oil storage tank is an arc surface, the axis of the arc surface coincides with the axis of the needle tooth housing, the diameter of the arc surface is D1, and the top diameter of the needle tooth hole is D2. 0.05d<(D1-D2)<0.1d, d is the base circle diameter of the needle tooth hole.

7. The needle tooth housing according to claim 6, characterized in that: A plane passing through the axis of the mounting hole and the center line of the needle tooth hole is used as a reference plane; the first circumference segment and the second circumference segment are symmetrical about the reference plane; and the oil storage tank is symmetrical about the reference plane.

8. The needle tooth housing according to claim 7, characterized in that: The first circumferential segment includes a first mating surface and lubricating surfaces located on both sides of the first mating surface in the circumferential direction, the lubricating surfaces including a first lubricating surface A close to the oil storage tank and a first lubricating surface B away from the oil storage tank; the first mating surface contacts the outer circumferential surface of the needle tooth pin, a first lubricating cavity A is formed between the first lubricating surface A and the outer circumferential surface of the needle tooth pin, and a first lubricating cavity B is formed between the first lubricating surface B and the outer circumferential surface of the needle tooth pin; the rotation of the needle tooth pin can drive the lubricating oil in the oil storage tank into the first lubricating cavity A and the first lubricating cavity B, and a lubricating oil film is formed between the first mating surface and the outer circumferential surface of the needle tooth pin; and / or, The second circumferential segment includes a second mating surface and lubricating surfaces located on both sides of the second mating surface, and the lubricating surfaces include a second lubricating surface A close to the oil storage tank and a second lubricating surface B away from the oil storage tank; the second mating surface contacts the outer cylindrical surface of the needle tooth pin, and a second lubricating cavity A is formed between the second lubricating surface A and the outer cylindrical surface of the needle tooth pin, and a second lubricating cavity B is formed between the second lubricating surface B and the outer cylindrical surface of the needle tooth pin; the rotation of the needle tooth pin can drive the lubricating oil in the oil storage tank into the second lubricating cavity A and the second lubricating cavity B, and a lubricating oil film is formed between the second mating surface and the outer cylindrical surface of the needle tooth pin.

9. The needle tooth housing according to claim 8, characterized in that: On a cross section perpendicular to the axis of the needle tooth hole, the intersection of the cross section and the axis of the needle tooth hole is point O, and the ray extending from point O to the center point of the oil storage tank is OX; With point O as the pole and ray OX as the polar axis, polar coordinates are established. The curve equation of the first segment is: ρ=0.5d+fcos(2α),- <a<- ; The curve equation of the second segment is: ρ=0.5d+fcos(2α), <α< ; d is the base circle diameter of the needle tooth hole, f is the deformation coefficient relative to the base circle, 0.0003d<f<0.001d.

10. An RV reducer, characterized in that: It comprises the needle tooth housing according to any one of claims 1 to 9; a plurality of needle tooth holes are uniformly formed on the inner wall surface of the mounting hole of the needle tooth housing along the circumferential direction, and a needle tooth pin is provided in each needle tooth hole, and the needle tooth pin is engaged with the needle tooth hole through the first meshing position and the second meshing position in the needle tooth hole.

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