Self-lubricating cycloidal pin gear transmission structure and RV speed reducer

Abstract

The utility model relates to a self-lubricating cycloid pin gear transmission structure, which comprises a pin gear housing and a pin gear, a pin gear groove is arranged on the inner side wall of a mounting hole of the pin gear housing, the pin gear is mounted in the pin gear groove in a rolling manner, and the self-lubricating cycloid pin gear transmission structure is characterized in that a lubricating structure is arranged between the pin gear and the pin gear groove; the lubricating structures are needle tooth holes formed in the needle teeth and lubricating materials filled in the needle tooth holes; or the lubricating structure comprises a tooth groove hole formed in the needle tooth groove and a lubricating material filled in the tooth groove hole. According to the self-lubricating cycloid pin gear transmission structure, the self-lubricating structure is arranged between the pin gears or the pin gear grooves, and an effective lubricating film can be formed between the pin gears and the pin gear housing in the transmission process no matter the pin gear holes in the pin gears or the pin gear groove holes in the pin gear grooves are filled with graphite or other lubricating agents, so that the service life of the pin gears is prolonged, and the service life of the pin gears is prolonged. Therefore, the transmission efficiency is improved, and the service life of the RV speed reducer is prolonged.

Description

Technical Field

[0001] The utility model relates to a self-lubricating cycloid pin-tooth transmission structure and an RV reducer, belonging to the technical field of reducer structures. Background Art

[0002] RV reducers have the advantages of high precision, high rigidity, strong load-bearing capacity, and high transmission efficiency, and are widely used in various fields of industrial production. With the informationization upgrade of industrial production, the demand for RV reducers in the domestic and foreign markets is increasing. Although the existing structural form of RV reducers has been developed for many years, there is still room for optimization and upgrading of its structure.

[0003] The current RV reducer adopts a planetary + cycloid transmission mechanism, in which the reducer pin gear housing and the pin gear adopt a sliding bearing structure, and the pin gear and the pin gear housing are matched in a cylindrical and semi-mounting hole manner, and the diameter of the semi-mounting hole is slightly larger than the diameter of the pin gear; the pin gear forms a line contact with the inner surface of the pin gear housing in the semi-mounting hole, and has high requirements for material properties and production precision. When there is an error in production precision and it is squeezed, it is difficult to form a lubricating oil film on the contact surface of the pin gear and the pin gear housing, and stress concentration occurs between the pin gear and the pin gear housing, and the friction coefficient of the contact surface increases, which reduces the transmission efficiency of the reducer, accelerates the wear of the pin gear, and reduces the service life of the reducer. Summary of the invention

[0004] In view of the problem that it is difficult to form a lubricating oil film between the pin gear housing and the contact surface of the pin gear of the existing RV reducer, the utility model proposes a self-lubricating cycloidal pin gear transmission structure to effectively reduce the sliding coefficient of the bearing contact surface, reduce the requirements on the material and processing accuracy of the pin gear housing and the pin gear of the reducer, effectively improve its transmission efficiency, and increase the service life of the reducer.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is:

[0006] In the first aspect, the present application discloses a self-lubricating cycloidal pin-tooth transmission structure, comprising a pin-tooth housing and pin-tooths, wherein a pin-tooth groove is provided on the inner side wall of the mounting hole of the pin-tooth housing, and the pin-tooths are rollingly mounted in the pin-tooth grooves, and the special feature thereof is that a lubrication structure is provided between the pin-tooths and the pin-tooth grooves;

[0007] The lubricating structure is a needle tooth hole opened on the needle tooth and a lubricating material filled in the needle tooth hole; or,

[0008] The lubricating structure is a tooth groove hole opened on the needle tooth groove and a lubricating material filled in the tooth groove hole.

[0009] Furthermore, when the lubrication structure is a needle tooth hole opened on the needle tooth and a lubricating material filled in the needle tooth hole, the needle tooth hole is a plurality of straight through holes opened radially or obliquely on the needle tooth, and two ends of each straight through hole form two lubrication points in contact with the needle tooth groove on the outer periphery of the needle tooth, and the lubricating material filled in the straight through hole is a graphite product or lubricating grease.

[0010] Furthermore, the graphite product is a prefabricated graphite column, which is placed inside the needle tooth hole and has an interference fit therewith. The end faces of both ends of the graphite column are arc surfaces, which are adapted to the outer circumferential contour of the needle tooth.

[0011] Furthermore, when the lubrication structure is a needle tooth hole opened on the needle tooth and a lubricating material filled in the needle tooth hole, the needle tooth hole is a plurality of blind holes opened radially or obliquely on the needle tooth, each blind hole forms a lubrication point in contact with the needle tooth groove on the outer periphery of the needle tooth, and the lubricating material filled in the blind hole is a graphite product or lubricating grease.

[0012] Furthermore, the graphite product is a prefabricated graphite column, which is placed inside the needle tooth hole and has an interference fit therewith. The exposed end surface of one side of the graphite column is a curved surface, which is matched with the outer circumferential contour of the needle tooth.

[0013] Furthermore, when the lubrication structure is a tooth groove hole opened on the needle tooth groove and a lubricating material filled in the tooth groove hole, the tooth groove hole is a plurality of dovetail grooves opened on the surface of the needle tooth groove, and each dovetail groove notch forms a lubrication point on the surface of the needle tooth groove that contacts the outer peripheral surface of the needle tooth, and the tooth groove hole is filled with graphite products or lubricating grease.

[0014] Furthermore, a flexible ball is rollingly fitted inside the dovetail groove, and the diameter of the flexible ball is larger than the notch of the dovetail groove.

[0015] In a second aspect, the present application discloses an RV reducer, which is special in that the RV reducer has a self-lubricating cycloid pin-tooth transmission structure.

[0016] The utility model discloses a self-lubricating cycloidal pin-tooth transmission structure, in which a self-lubricating structure is arranged between the pin-tooth or the pin-tooth groove, and whether it is a pin-tooth hole on the pin-tooth or a tooth groove hole on the pin-tooth groove, the pin-tooth hole or the tooth groove hole is filled with graphite or other lubricant, so that an effective lubricating film can be formed between the pin-tooth and the pin-tooth housing during the transmission process, thereby reducing wear and tear, and further improving the transmission efficiency and the service life of the RV reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Schematic diagram of a self-lubricating cycloid pin-tooth transmission structure of Example 1;

[0018] Figure 2 : Schematic diagram of needle tooth structure;

[0019] Figure 3 : Schematic diagram of a hole opening form of the needle tooth hole on the needle tooth;

[0020] Figure 4 : Schematic diagram of another opening form of the needle tooth hole on the needle tooth;

[0021] Figure 5 : Schematic diagram of the third opening form of the needle hole on the needle teeth

[0022] Figure 6 : A partial enlarged view of the matching state between the needle teeth and the needle tooth housing;

[0023] Figure 7 : Partial cross-sectional view of RV reducer;

[0024] In the figure, 1. needle gear housing, 11. needle gear groove, 11a. tooth groove hole, 2. needle gear, 21. needle gear hole, 21a. straight through hole one, 21b. straight through hole two, 21c. blind hole, 3. spur gear, 4. RV gear, 5. eccentric shaft, 6. input shaft, 7. output shaft. DETAILED DESCRIPTION

[0025] The utility model is described in detail below with reference to the accompanying drawings.

[0026] Embodiment 1

[0027] A self-lubricating cycloidal needle gear transmission structure comprises a needle gear housing 1 and needle gears 2. A circle of needle gear grooves 11 is provided on the inner side wall of the mounting hole of the needle gear housing 1. The needle gears 2 are cylindrical structures. The needle gear grooves 11 are semicircular groove structures adapted to the contour of the needle gears 2. The needle gears 2 are rollingly mounted in the needle gear grooves 11, and a lubrication structure is provided between the two.

[0028] The lubrication structure includes a needle tooth hole 21 opened on the needle tooth 2, and the needle tooth hole 21 is a straight through hole 21a radially opened on the needle tooth 2 to form a lubrication cavity. A graphite column is plugged inside the straight through hole 21a, and there is an interference fit between the graphite column and the needle tooth hole 21, and the two end surfaces of the graphite column are arc surfaces, which are adapted to the outer cylindrical surface of the needle tooth 2.

[0029] Embodiment 2

[0030] The difference between this embodiment and the first embodiment is that the needle tooth hole 21 is a second straight hole 21b obliquely opened on the needle tooth 2 to form a lubrication cavity, a graphite column is plugged inside the second straight hole 21b, the graphite column and the needle tooth hole 21 are interference fit, and the two end surfaces of the graphite column are arc surfaces, which are adapted to the outer cylindrical surface of the needle tooth 2.

[0031] Embodiment 3

[0032] The difference between this embodiment and the above embodiments is that the needle tooth hole 21 is a plurality of blind holes 21c radially or obliquely opened on the needle tooth, each blind hole 21c forms a lubrication point in contact with the needle tooth groove 11 on the outer circumferential surface of the needle tooth 2, and the blind hole 21c is filled with lubricating grease.

[0033] Embodiment 4

[0034] The difference between this embodiment and the above embodiments is that the lubrication structure is a tooth groove hole 11a opened on the needle tooth groove 11 and a lubricating material filled in the tooth groove hole 11a, the tooth groove hole 11a is a plurality of dovetail grooves opened on the surface of the needle tooth groove 11, each dovetail groove notch forms a lubrication point on the surface of the needle tooth groove 11 that contacts the outer peripheral surface of the needle tooth 2, and the tooth groove hole 11a is filled with graphite.

[0035] Embodiment 5

[0036] The difference between this embodiment and the fourth embodiment is that the inside of the dovetail groove is filled with lubricating grease, and a flexible ball 12 is rollingly fitted therein, and the diameter of the flexible ball 12 is larger than the notch of the dovetail groove.

[0037] Embodiment 6

[0038] The present embodiment discloses an RV reducer, comprising a pinion housing 1, pinion teeth 2, a spur gear 3, an input shaft 6, an output shaft 7, an eccentric shaft 5 and an RV gear 4. A lubrication structure is provided between the pinion housing 1 and the pinion teeth 2, and the lubrication structure adopts any one of the structural forms of embodiments one to five.

[0039] Compared with the traditional product structure, the self-lubricating cycloid pin-tooth transmission structure of the utility model has the following structural advantages:

[0040] 1. Because there is a good self-lubricating structure between the pinion housing and the pinion teeth, the requirements for the machining accuracy of the pinion housing and the pinion teeth of the reducer can be appropriately reduced;

[0041] 2. The self-lubricating structure between the needle gear housing and the needle gear makes it easier to form a lubricating film, effectively improving its transmission efficiency, reducing wear and increasing the service life of the reducer;

[0042] 3. The needle teeth filled with graphite or other lubricants are in contact with the cycloidal pinwheel, which can transform the grease-lubricated sliding bearing structure between the RV reducer pin gear housing and the pin gear into a bearing structure with good self-lubricating function.

Claims

1. A self-lubricating cycloidal pin-tooth transmission structure, comprising a pin-tooth housing and pin-tooths, wherein the inner side wall of the mounting hole of the pin-tooth housing is provided with a pin-tooth groove, and the pin-tooths are rollingly mounted in the pin-tooth groove, characterized in that: A lubricating structure is provided between the needle teeth and the needle tooth grooves; the lubricating structure is a needle tooth hole provided on the needle teeth and a lubricating material filled in the needle tooth hole; The needle tooth hole is a plurality of straight through holes radially or obliquely opened on the needle tooth, and two lubrication points in contact with the needle tooth groove are formed at both ends of each straight through hole on the outer periphery of the needle tooth. The lubricating material filled in the straight through hole is a prefabricated graphite column, which is placed inside the needle tooth hole and has an interference fit therewith; the end faces of both ends of the graphite column are arc surfaces, which are adapted to the outer circumferential contour of the needle tooth; or, The needle tooth hole is a plurality of blind holes radially or obliquely opened on the needle tooth, each blind hole forms a lubrication point in contact with the needle tooth groove on the outer periphery of the needle tooth, the lubricating material filled in the blind hole is a prefabricated graphite column, the graphite column is placed inside the needle tooth hole and has an interference fit therewith; the exposed end face of one side of the graphite column is an arc surface, and the arc surface is adapted to the outer circumferential contour of the needle tooth.

2. An RV reducer, characterized in that: A self-lubricating cycloid pin-tooth transmission structure as claimed in claim 1.

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