CN209875894U

CN209875894U - Combined crankshaft of RV reducer

Info

Publication number: CN209875894U
Application number: CN201920127397.9U
Authority: CN
Inventors: 宋彬
Original assignee: Chengdu Double Times Technology Co
Current assignee: Chengdu Double Times Technology Co
Priority date: 2019-01-25
Filing date: 2019-01-25
Publication date: 2019-12-31
Anticipated expiration: 2029-01-25

Abstract

The utility model discloses a modular RV speed reducer bent axle, including bent axle pole, cam A and cam B, cam A is reverse suit on the bent axle pole with cam B, cam A and cam B are the same, set up the recess more than 2 along its length direction on the bent axle pole, set up the eccentric orfice in cam A and the cam B, eccentric orfice processing has with recess assorted arch to through arch and bent axle pole location joint. Compared with the prior art, the utility model discloses a combination formula RV speed reducer bent axle is made easily, through our actual manufacturing and test, the finished product precision will be better than the still of integrated into one piece processing. The combined crankshaft can be replaced and repaired after the eccentric wheel is worn. And the manufacturing cost is low, and the requirement on manufacturing equipment is low. Meanwhile, the positioning problem of the eccentric wheel and the planetary gear is solved, and the positioning device has great significance for reducing the manufacturing cost of the RV reducer and promoting the development of the robot industry in China.

Description

Combined crankshaft of RV reducer

Technical Field

The utility model relates to a robot makes the field, especially relates to a modular RV speed reducer bent axle.

Background

At present, in the field of robot manufacturing, a crankshaft and a reverse cam of an RV reducer are mostly integrally processed, the manufacturing difficulty is high, the requirements on process precision and the like are high, the yield is low, and expensive foreign imported equipment is mostly adopted for processing. And because of its integral structure, the eccentric wheel can't be changed and whole scrapped after wearing out.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a combination formula RV speed reducer bent axle of having solved above-mentioned problem.

In order to realize the purpose, the utility model discloses a technical scheme is: the utility model provides a modular RV speed reducer bent axle, includes bent axle pole, cam A and cam B, cam A is reverse suit on the bent axle pole with cam B, cam A is the same with cam B, set up the recess more than 2 along its length direction on the bent axle pole, set up the eccentric orfice in cam A and the cam B, eccentric orfice processing has the arch with the recess assorted in the eccentric orfice to through arch and bent axle pole location joint.

Preferably, one end of the crankshaft rod is sleeved with a planetary gear, and an inner ring of the planetary gear is provided with a bulge matched with the groove.

Preferably, snap springs for limiting are arranged at two ends of the planetary gear and between the cam A and the cam B.

Preferably, the crankshaft rod is provided with an annular groove matched with the clamp spring.

Preferably, the side surface of the groove is in interference fit with the side surface of the protrusion.

Preferably, the grooves are 2 and are arranged oppositely at 180 degrees along the circumferential direction of the crankshaft rod.

Preferably, the grooves are 3 and are uniformly spaced at 120 ° intervals in the circumferential direction of the crankshaft.

Preferably, the grooves are 4 and are uniformly spaced at 90 ° intervals in the circumferential direction of the crankshaft.

Preferably, the direction of the projection of one of the projections is perpendicular to the eccentric direction of the eccentric wheel.

Preferably, the protrusion on the cam a is integrally formed with the cam a, and the protrusion on the cam B is integrally formed with the cam B.

Compared with the prior art, the utility model has the advantages of: the utility model discloses a combination formula RV speed reducer bent axle is made easily, through our actual manufacturing and test, the finished product precision will be better than an integrated into one piece processing still. And the eccentric wheel can be replaced after being worn, so that the manufacturing cost is low, and the requirement on manufacturing equipment is low. Meanwhile, the positioning problem of the eccentric wheel and the planetary gear is solved, and the positioning device has great significance for reducing the manufacturing cost of the RV reducer and promoting the development of the robot industry in China.

Drawings

Fig. 1 is a schematic view of the assembled overall structure of the present invention;

FIG. 2 is a schematic view of the overall cross-sectional structure of the present invention;

FIG. 3 is a schematic structural view of a crankshaft of the present invention;

fig. 4 is a schematic structural view of the planetary gear of the present invention;

fig. 5 is a schematic structural view of a cam a and a cam B in embodiment 1 of the present invention;

fig. 6 is a schematic cross-sectional structure view of a cam a, a cam B, and a crankshaft rod according to embodiment 2 of the present invention;

fig. 7 is a schematic sectional structure view of a cam a, a cam B, and a crank shaft according to embodiment 3 of the present invention.

In the figure: 1. a crankshaft rod; 2. a cam A; 3. a cam B; 4. a planetary gear; 5. a clamp spring; 6. an annular groove; 7. a card slot; 8. and (4) protruding.

Detailed Description

The present invention will be further explained below.

Example 1: referring to fig. 1 to 5, the combined type crankshaft of the RV reducer comprises a crankshaft rod 1, a cam a2 and a cam B3, wherein the cam a2 and the cam B3 are reversely sleeved on the crankshaft rod 1, the cam a2 and the cam B3 are the same, and the same means that the size, the eccentric hole, the strength, the working surface radian and the like are the same, so that the extremely high symmetry after the cam a2 and the cam B3 are assembled is realized, and the crankshaft is an important index for realizing the high precision. If the integrated machining is adopted, the high precision is difficult to achieve, so that the split detachable connection is adopted, when the cam is machined and manufactured, in order to ensure the consistency of the cam A2 and the cam B3, the same cam rod is machined and thermally treated, then the cam rod is respectively cut out, and the cam A2 and the cam B3 are detected after cutting, so that the consistency of the cam A2 and the cam B3 is ensured. After consistency is kept, when the cam A2 and the cam B3 are arranged in the opposite direction, good symmetry of the working contact surface can be ensured, and the requirement of high precision is met. The crankshaft rod 1 is provided with more than 2 grooves 7 along the length direction, the embodiment takes 2 grooves as an example, the 2 grooves 7 are oppositely arranged along the circumferential direction of the crankshaft rod 1 at 180 degrees, eccentric holes are arranged in the cam A2 and the cam B3, the eccentric distance of the eccentric holes is 0.7-2.5 mm, two symmetrical rectangular bulges 8 are arranged in the eccentric holes, the bulges 8 are matched with the 2 grooves 7 on the crankshaft rod 1 and realize positioning clamping with the crankshaft rod 1, the cams are limited and fixed through the bulges 8 and the grooves 7, the bulges 8 are aligned and reversely clamped into the two cams during disassembly and assembly, the grooves 7 are used for fixing the cam A2, the cam B3 and the planetary gear which are sleeved on the crankshaft rod 1, the structure is simple, the manufacture is convenient, the whole is stable and reliable, the positioning effect is good, the assembly and the disassembly are convenient, the shapes of the grooves 7 and the bulges 8 are convenient to process, the precision is easy to control. Preferably, the direction of the protrusion 8 is the same as or perpendicular to the eccentric direction of the eccentric wheel, so that the cam is convenient to mount, the protrusion 8 and the groove 7 are both rectangular, the matching coefficient is good, the crankshaft rod 1, the cam and the planetary gear 4 are easy to machine, and the machining precision can be effectively guaranteed.

One end of the crankshaft rod 1 is sleeved with a planetary gear 4, the inner ring of the planetary gear 4 is provided with a protrusion 8 matched with the groove 7, the planetary gear 4 can be limited through the protrusion 8, and the processing difficulty of the inner hole of the planetary gear 4 is greatly simplified.

The two ends of the planetary gear 4 and the space between the cam A2 and the cam B3 are provided with clamp springs 5 with limiting effects, the crankshaft rod 1 is provided with an annular groove 6 matched with the clamp springs 5, the clamp springs 5 are limited through the annular groove 6, the planetary gear 4 and the clamp springs 5 are limited through the clamp springs 5, and a limiting structure is formed at the end of the crankshaft, so that the structural stability of the crankshaft is better, the two ends of the cam A2 and the two ends of the cam B3 are abutted through mounting bearings, and the space between the cam A2 and the cam B3 is limited through the clamp springs 5, so that the cam A2 and the cam B3 are prevented from deviating in the working process and the bearing mounting process.

The side surface of the groove 7 is in interference fit with the side surface of the protrusion 8, the structural connection is stable, and the looseness is avoided. The bulge 8 on the cam A2 and the cam A2 are integrally formed, and the bulge 8 on the cam B3 and the cam B3 are integrally formed, so that the structure strength is good, and the eccentric hole can be machined during machining.

Example 2: the grooves 7 are 3 and are uniformly arranged at intervals of 120 degrees along the circumferential direction of the crankshaft rod 1, the symmetry of the cam A2 and the cam B3 needs to be considered when the grooves 7 and the protrusions 8 are designed, and when the protrusions 8 are machined, the direction of one protrusion 8 is perpendicular to the eccentric direction of the cam, so that the design and installation of the cam A2 and the cam B are facilitated, and the reference of fig. 6 is provided. The increased number of grooves 7 increases structural stability but decreases structural strength. This embodiment is the same as embodiment 1 except that the number of the grooves 7 and the projections 8 is changed.

Example 3: the grooves 7 are 4 and are uniformly arranged at intervals of 90 degrees along the circumferential direction of the crankshaft rod 1, the symmetry of the cam A2 and the cam B3 needs to be considered when the grooves 7 and the protrusions 8 are designed, and when the protrusions 8 are machined, the direction of one protrusion 8 is perpendicular to the eccentric direction of the cam, so that the design and installation of the cam A2 and the cam B are facilitated, and the reference of fig. 7 is provided. The increase of the number of the grooves can increase the structural stability, but can reduce the structural strength, the strength is poorer than that of 4 grooves, and the product effect is not ideal. This embodiment is the same as embodiment 1 except that the number of the grooves 7 and the projections 8 is changed.

The combined type RV reducer crankshaft is easy to manufacture, and the precision of a finished product is better than that of integral machining through actual manufacturing and testing. And the eccentric wheel can be replaced after being worn, so that the manufacturing cost is low, and the requirement on manufacturing equipment is low. The method has great significance for reducing the manufacturing cost of the RV reducer and promoting the development of the robot industry in China.

The above description has made a detailed description of the crankshaft of the combined RV reducer provided by the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention, and the specific examples are applied herein to explain the principle and the implementation of the present invention; while the invention has been described in terms of specific embodiments and applications, it will be apparent to those skilled in the art that numerous variations and modifications can be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a modular RV speed reducer bent axle, includes bent axle pole, cam A and cam B, its characterized in that: the cam A and the cam B are reversely sleeved on the crankshaft rod, the cam A and the cam B are identical, more than 2 grooves are formed in the crankshaft rod along the length direction of the crankshaft rod, eccentric holes are formed in the cam A and the cam B, protrusions matched with the grooves are machined in the eccentric holes, and the eccentric holes are in positioning clamping connection with the crankshaft rod through the protrusions.

2. The combined RV reducer crankshaft of claim 1, characterized in that: one end of the crankshaft rod is sleeved with a planetary gear, and the inner ring of the planetary gear is provided with a bulge matched with the groove.

3. The combined RV reducer crankshaft of claim 2, characterized in that: and clamp springs for limiting are arranged at the two ends of the planetary gear and between the cam A and the cam B.

4. The combined RV reducer crankshaft of claim 3, wherein: and the crankshaft rod is provided with an annular groove matched with the clamp spring.

5. The combined RV reducer crankshaft according to any one of claims 1-4, characterized in that: and the side surface of the groove is in interference fit with the side surface of the protrusion.

6. The combined RV reducer crankshaft of claim 2, characterized in that: the grooves are 2 and are oppositely arranged along the circumferential direction of the crankshaft rod at an angle of 180 degrees.

7. The combined RV reducer crankshaft of claim 2, characterized in that: the grooves are 3 and are uniformly arranged at intervals of 120 degrees along the circumferential direction of the crankshaft rod.

8. The combined RV reducer crankshaft of claim 2, characterized in that: the grooves are 4 and are uniformly arranged at intervals of 90 degrees along the circumferential direction of the crankshaft rod.

9. The combined RV reducer crankshaft of claim 7 or 8, characterized in that: the convex direction of one of the bulges is vertical to the eccentric direction of the eccentric wheel.

10. The combined RV reducer crankshaft of claim 1, characterized in that: the bulge on the cam A is integrally formed with the cam A, and the bulge on the cam B is integrally formed with the cam B.