RV reducer with compact structure and roller bearing

Abstract

The RV speed reducer with the compact structure comprises a shell, a cylindrical cavity is formed in the inner wall of the shell, and a plurality of needle pins are arranged on the inner wall of the cylindrical cavity; the shell is connected with an eccentric shaft through a first bearing, two cycloidal gears are arranged on the eccentric shaft, and the cycloidal gears and a needle pin form a swing meshing connection structure; the shell is fixedly connected with the outer ring of the roller bearing, and the two cycloidal gears are connected with the inner ring of the roller bearing through the output shaft pin. According to the RV speed reducer and the roller bearing which are compact in structure, only one bearing is used at the output position of the RV speed reducer, so that the overall structure is more compact; and the output disc is directly connected through the inner ring of the bearing, so that the number of parts is reduced, and the manufacturing and assembling cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of RV reducers, and particularly relates to a structurally compact RV reducer and a roller bearing. Background Art

[0002] The RV reducer is the abbreviation of Rotary Vector reducer, which is a new type of reducer with the characteristics of large transmission ratio, small vibration, low noise and low energy consumption. During the operation of the existing RV reducer, the rotation generated by the input shaft is transmitted to the cycloid gear through the eccentric shaft, and then the cycloid gear is transmitted to the output disk through the shaft pin.

[0003] In order to ensure the stable rotation of the output disk during the operation of the RV reducer, the output disk has a certain width, and two bearings are arranged between the output disk and the reducer housing to ensure the stable transmission of the cycloid gear to the output disk.

[0004] However, in actual use, due to the arrangement of multiple bearings, the structure of the RV reducer is relatively loose, which is not conducive to long-term stable operation and is not suitable for use in an environment with limited space. Moreover, the complex structure of the RV reducer is not suitable for miniaturization. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a structurally compact RV reducer, which solves the problem of using the existing RV reducer in a narrow space and is also convenient for the miniaturization of the RV reducer.

[0006] To solve the above technical problem, the technical solution adopted by the utility model is:

[0007] A structurally compact RV reducer includes a housing. The inner wall of the housing is provided with a cylindrical cavity, and the inner wall of the cylindrical cavity is provided with a plurality of needle pins; the housing is connected to the eccentric shaft through a first bearing, and two cycloid gears are arranged on the eccentric shaft. The cycloid gear and the needle pin form a swing meshing connection structure; the housing is fixedly connected to the outer ring of the roller bearing, and the two cycloid gears are connected to the inner ring of the roller bearing through an output shaft pin.

[0008] In a preferred solution, the outer wall of the eccentric shaft is provided with two eccentric cylindrical steps, and the two eccentric cylindrical steps are continuously arranged along the axial direction. The phase angles of the two eccentric cylindrical steps differ by 180°. The two eccentric cylindrical steps are respectively connected to the inner hole of the cycloid gear through needle roller bearings.

[0009] In a preferred solution, the inner ring of the roller bearing is connected to the eccentric shaft through a third bearing, and a plurality of second pin screw holes are arranged on the outer end face of the inner ring for connecting with a load;

[0010] A fourth sealing ring is arranged between the inner ring of the roller bearing and the eccentric shaft, and the end of the fourth sealing ring close to the eccentric shaft;

[0011] A stepped washer is provided between the third bearing and the eccentric cylindrical step. The stepped washer is annular and sleeved on the eccentric shaft.

[0012] In a preferred embodiment, a plurality of connecting screw holes are provided on the outer end face of the inner ring of the roller bearing. The connecting screw holes are connected to the output disk by second screws, and the output disk is connected to the eccentric shaft by a second bearing.

[0013] A plurality of first pin screw holes are provided on the end face of the output disk. The output disk is connected to the load through the first pin screw holes.

[0014] A stepped washer is provided between the second bearing and the eccentric cylindrical step. The stepped washer is annular and sleeved on the eccentric shaft.

[0015] In a preferred embodiment, a second sealing ring is provided between the housing and the eccentric shaft, and a third sealing ring is provided between the output disk and the eccentric shaft.

[0016] The second sealing ring and the third sealing ring are located at the position closest to the end of the eccentric shaft.

[0017] In a preferred embodiment, the eccentric shaft is provided with an axial through hole.

[0018] External screw holes are provided on both end faces of the eccentric shaft.

[0019] In a preferred embodiment, one section of the first pin screw hole on the output disk is a pin hole, and one section of the first pin screw hole on the inner ring is a screw hole.

[0020] In a preferred embodiment, the outer ring of the roller bearing is provided with first screw holes evenly distributed along the circumference, and the inner ring of the roller bearing is provided with second screw holes evenly distributed along the circumference.

[0021] The first screw holes and the second screw holes face in opposite directions respectively.

[0022] A step for positioning is provided on the end face of the outer ring close to the first screw hole.

[0023] A step for positioning is provided on the end face of the inner ring close to the second screw hole.

[0024] Inclined grooves are provided on the inner wall of the outer ring and the outer wall of the inner ring. Rollers are arranged crosswise in the grooves. The axes of the rollers intersect with the axis of the distribution circle at an angle of 45°, and the intersection points of the axes of adjacent rollers and the axis of the distribution circle are located on both sides of the distribution circle.

[0025] The length of the roller is less than the diameter of the roller.

[0026] A roller bearing for a structurally compact RV reducer. The outer ring of the roller bearing is provided with first screw holes evenly distributed along the circumference for connecting to the housing.

[0027] The inner ring of the roller bearing is provided with second screw holes evenly distributed along the circumference for connecting with the load;

[0028] The first screw hole and the second screw hole face opposite directions respectively;

[0029] On the end face of the outer ring close to the first screw hole, there is a step for positioning;

[0030] On the end face of the inner ring close to the second screw hole, there is a step for positioning.

[0031] In a preferred embodiment, the inner wall of the outer ring and the outer wall of the inner ring are provided with inclined grooves, and the grooves are provided with rollers arranged crosswise. The axis of the roller intersects the axis of the distribution circle at an angle of 45°, and the intersection points of the axes of adjacent rollers and the axis of the distribution circle are located on both sides of the distribution circle;

[0032] The length of the roller is less than the diameter of the roller, and the value is 0.01 mm to 0.1 mm;

[0033] A first sealing ring is also provided between the outer ring and the inner ring;

[0034] On the cross section of the inner ring far from the second screw hole, there are multiple output shaft pin jacks for connecting the output shaft pins.

[0035] The present utility model provides a structurally compact RV reducer. By adopting the above scheme, it has the following beneficial effects:

[0036] 1. Only one bearing is used at the output position of the RV reducer, making the overall structure more compact.

[0037] 2. Preferably, the output disk is directly connected through the inner ring of the bearing, reducing the number of parts and lowering the manufacturing and assembly costs.

[0038] 3. The length of the roller in the roller bearing is less than the diameter of the roller, which can ensure that the roller is always stressed by the cylindrical surface and the rollers do not affect each other, with high stability.

[0039] 4. By controlling the difference between the length of the roller and the diameter of the roller, the service life of the RV reducer can be controlled. After reaching the service life, it is replaced to ensure the matching accuracy of the entire equipment and improve the product efficiency of the RV reducer. Description of the Drawings

[0040] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0041] Figure 1 It is a schematic structural diagram of an embodiment of a structurally compact RV reducer of the present utility model;

[0042] Figure 2 It is a schematic structural diagram of an embodiment of the roller bearing of the present utility model;

[0043] Figure 3 It is the right view of a structurally compact RV reducer of the present utility model;

[0044] Figure 4 It is the schematic structural diagram of an embodiment of a structurally compact RV reducer of the present utility model;

[0045] Figure 5 It is the schematic structural diagram of an embodiment of a roller bearing of the present utility model.

[0046] In the figure:

[0047] housing 1, first screw 101, second sealing ring 102, first bearing 103, eccentric shaft 2, first eccentric cylindrical step 201, second eccentric cylindrical step 202, cycloid gear 3, needle roller bearing 301, roller bearing 4, outer ring 401, inner ring 402, roller 403, first sealing ring 404, output shaft pin jack 405, fourth sealing ring 406, second pin screw hole 407, third bearing 408, output shaft pin 5, shaft sleeve 501, output disk 6, second screw 601, second bearing 602, third sealing ring 603, first pin screw hole 604, step pad 7, pin 8. Specific embodiments

[0048] Embodiment 1:

[0049] As Figure 1 、 2 and shown in 3, a structurally compact RV reducer includes a housing 1, the inner wall of the housing 1 is provided with a cylindrical cavity, and a plurality of pins 8 are provided on the inner wall of the cylindrical cavity; the housing 1 is connected to the eccentric shaft 2 through the first bearing 103, two cycloid gears 3 are provided on the eccentric shaft 2, and the cycloid gears 3 and the pins 8 form a swing meshing connection structure; the housing 1 is fixedly connected to the outer ring 401 of the roller bearing 4, and the two cycloid gears 3 are connected to the inner ring 402 of the roller bearing 4 through the output shaft pin 5, and the output shaft of the input device can be connected through a coupling.

[0050] In a preferred solution, the outer wall of the eccentric shaft 2 is provided with two eccentric cylindrical steps, namely the first eccentric cylindrical step 201 and the second eccentric cylindrical step 202, the two eccentric cylindrical steps are continuously arranged along the axial direction, the phase angles of the two eccentric cylindrical steps differ by 180°, and the two eccentric cylindrical steps are respectively connected to the central holes of the cycloid gears 3 through the needle roller bearings 301. During the rotation of the eccentric shaft 2, the two cycloid gears 3 are driven to rotate with a phase difference of 180° through the first eccentric cylindrical step 201 and the second eccentric cylindrical step 202, that is, cooperate with the pins 8 to perform speed reduction rotation.

[0051] During the working process, the rotational motion input by the driving device drives the eccentric shaft 2 to rotate. Then, the rotational motion causes the first eccentric cylindrical step 201 and the second eccentric cylindrical step 202 to drive the two cycloidal gears 3 to rotate with a 180° phase difference. The cycloidal gears 3 cooperate with the pin shafts 8 to perform a speed reduction rotation. The cycloidal gears 3 directly or indirectly drive the inner ring 402 to rotate slowly synchronously through the output shaft pin 5, and the reduced torque is output through the inner ring 402. Compared with the prior art, the same effect can be achieved by only using one bearing at the output position in this application. And in an alternative solution, the inner ring 402 can also be directly used for output, with a more compact structure and better working effect.

[0052] In a preferred solution, the inner ring 402 of the roller bearing 4 is connected to the eccentric shaft 2 through a third bearing 408. A plurality of second pin screw holes 407 are provided on the outer end face of the inner ring 402, and the second pin screw holes 407 are used to connect with the load. During output, the RV reducer of this application is directly connected to the load through the inner ring 402 of the roller bearing 4, which not only has a compact structure but also reduces the number of parts and lowers the manufacturing and assembly costs.

[0053] A fourth sealing ring 406 is provided between the inner ring 402 of the roller bearing 4 and the eccentric shaft 2, and the end of the fourth sealing ring 406 close to the eccentric shaft 2.

[0054] A step pad 7 is provided between the third bearing 408 and the eccentric cylindrical step. The step pad 7 is annular and sleeved on the eccentric shaft 2. The position between the eccentric cylindrical step and the third bearing 408 can be defined through the step pad to avoid installation errors.

[0055] Embodiment 2:

[0056] As Figure 4 and 5 shown, a compact RV reducer includes a housing 1. The inner wall of the housing 1 is provided with a cylindrical cavity, and a plurality of pin shafts 8 are provided on the inner wall of the cylindrical cavity. The housing 1 is connected to the eccentric shaft 2 through a first bearing 103. Two cycloidal gears 3 are provided on the eccentric shaft 2, and the cycloidal gears 3 and the pin shafts 8 form a swing meshing connection structure. The housing 1 is fixedly connected to the outer ring 401 of the roller bearing 4. The two cycloidal gears 3 are connected to the inner ring 402 of the roller bearing 4 through output shaft pins 5. A plurality of connection screw holes are provided on the outer end face of the inner ring 402 of the roller bearing 4, and the connection screw holes are connected to an output disk 6 through second screws 601.

[0057] During the working process, the rotational motion input by the driving device drives the eccentric shaft 2 to rotate. Then, the rotational motion causes the first eccentric cylindrical step 201 and the second eccentric cylindrical step 202 to drive the two cycloidal gears 3 to rotate with a 180° phase difference. The cycloidal gears 3 cooperate with the pin pins 8 to perform a speed reduction rotation. The cycloidal gears 3 directly or indirectly drive the inner ring 402 to rotate slowly synchronously through the output shaft pin 5. The inner ring 402 drives the output disk 6 to rotate, and the decelerated torque output is completed through the output disk 6. Compared with the prior art, in this application, only one bearing is used at the output position to achieve the same effect, the structure is more compact, and the working effect is better.

[0058] In a preferred solution, the output disk 6 is connected to the eccentric shaft 2 through a second bearing 602. A plurality of first pin screw holes 604 are provided on the end face of the output disk 6. The output disk 6 is connected to the load through the first pin screw holes 604. Here, the output disk 6 is used to complete the output to adapt to different usage situations;

[0059] A step pad 7 is provided between the second bearing 602 and the eccentric cylindrical step. The step pad 7 is annular and sleeved on the eccentric shaft 2. The position between the eccentric cylindrical step and the second bearing 602 can be limited through the step pad to avoid installation errors.

[0060] In a preferred solution, a second sealing ring 102 is provided between the housing 1 and the eccentric shaft 2, and a third sealing ring 603 is provided between the output disk 6 and the eccentric shaft 2. The second sealing ring 102 and the third sealing ring 603 are located at the position closest to the end of the eccentric shaft 2.

[0061] In a preferred solution, one section of the first pin screw hole 601 on the output disk 6 is a pin hole, and one section of the first pin screw hole 601 on the inner ring 402 is a screw hole. While ensuring the connection, the connection stability is also ensured.

[0062] Embodiment 3:

[0063] The eccentric shaft 2 is provided with an axial through hole, and a cable or other structure can be passed through the axial through hole according to needs to adapt to different usage requirements;

[0064] External screw holes are provided on both end faces of the eccentric shaft 2 for different connection requirements.

[0065] In a preferred solution, the outer ring 401 of the roller bearing 4 is provided with first screw holes evenly distributed along the circumference, and the inner ring 402 of the roller bearing 4 is provided with second screw holes evenly distributed along the circumference;

[0066] The first screw holes and the second screw holes face in opposite directions respectively;

[0067] A step for positioning is provided on the end face of the outer ring 401 close to the first screw hole;

[0068] A step for positioning is provided on the end face of the inner ring 402 close to the second screw hole;

[0069] The inner wall of the outer ring 401 and the outer wall of the inner ring 402 are provided with inclined grooves, and cross-arranged rollers 403 are arranged in the grooves. The axis of the roller 403 intersects the axis of the distribution circle at an angle of 45°, and the intersection points of the axes of adjacent rollers 403 and the axis of the distribution circle are located on both sides of the distribution circle;

[0070] The length of the roller 403 is less than the diameter of the roller 403.

[0071] Embodiment 4:

[0072] The roller bearing of the present utility model can be sold separately. As Figure 2 and 5 shown, a roller bearing for a structurally compact RV reducer, the outer ring 401 of the roller bearing 4 is provided with circumferentially evenly distributed first screw holes for connecting with the housing 1;

[0073] The inner ring 402 of the roller bearing 4 is provided with circumferentially evenly distributed second screw holes for connecting with the load. The first screw holes and the second screw holes face opposite directions; that is, the roller bearing can both transmit power and directly connect to the load, with stronger adaptability;

[0074] A step for positioning is provided on the end face of the outer ring 401 close to the first screw hole for positioning when connecting with the housing 1;

[0075] A step for positioning is provided on the end face of the inner ring 402 close to the second screw hole for positioning when connecting with the load or the output disc 6.

[0076] In a preferred solution, the inner wall of the outer ring 401 and the outer wall of the inner ring 402 are provided with inclined grooves, and cross-arranged rollers 403 are arranged in the grooves. The axis of the roller 403 intersects the axis of the distribution circle at an angle of 45°, and the intersection points of the axes of adjacent rollers 403 and the axis of the distribution circle are located on both sides of the distribution circle. During use, it can bear loads in multiple directions such as radial and axial directions, with higher stability, high rigidity and high precision, can achieve high-precision rotational motion, and the structure is more compact;

[0077] The length of the roller 403 is less than the diameter of the roller 403, and the value is 0.01 mm to 0.1 mm. During use, it can ensure that the roller 403 is always stressed by the cylindrical surface, and the rollers will not affect each other;

[0078] After long-term use, the cylindrical surface will be worn, and the length of the roller 403 will no longer be less than the diameter of the roller 403. At this time, the rotation between the outer ring 401 and the inner ring 402 will be affected. When the service life is reached, it should be replaced in time to ensure the fitting accuracy of the entire equipment;

[0079] A first sealing ring 404 is also provided between the outer ring 401 and the inner ring 402;

[0080] A plurality of output shaft pin jacks 405 are provided on the cross-section of the inner ring 402 away from the second screw hole for connecting the output shaft pin 5.

[0081] This application proposes a speed reducer, and the RV speed reducer cannot be construed as a limitation to this application.

[0082] The above embodiments are only the preferred technical solutions of the present utility model and should not be regarded as limitations to the present utility model. The protection scope of the present utility model should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. A compact RV reducer, comprising a housing (1), the inner wall of the housing (1) being provided with a cylindrical cavity, the inner wall of the cylindrical cavity being provided with a plurality of pins (8); the housing (1) being connected to an eccentric shaft (2) via a first bearing (103), the eccentric shaft (2) being provided with two cycloid wheels (3), the cycloid wheels (3) and the pins (8) forming a swinging meshing connection structure; the characteristics are: The housing (1) is fixedly connected to the outer ring (401) of the roller bearing (4), and the two cycloid wheels (3) are connected to the inner ring (402) of the roller bearing (4) via an output shaft pin (5).

2. A compact RV reducer according to claim 1, characterized in that: The outer wall of the eccentric shaft (2) is provided with two eccentric cylindrical steps, the two eccentric cylindrical steps are arranged continuously along the axial direction, the phase angles of the two eccentric cylindrical steps differ by 180 degrees, and the two eccentric cylindrical steps are respectively connected to the inner hole of the cycloid wheel (3) through needle roller bearings (301).

3. A compact RV reducer according to claim 2, characterized in that: The inner ring (402) of the roller bearing (4) is connected to the eccentric shaft (2) via a third bearing (408), and a plurality of second pin screw holes (407) are provided on the outer end surface of the inner ring (402), and the second pin screw holes (407) are used to connect to a load; A fourth sealing ring (406) is provided between the inner ring (402) of the roller bearing (4) and the eccentric shaft (2), and the fourth sealing ring (406) is close to the end of the eccentric shaft (2); A step pad (7) is provided between the third bearing (408) and the eccentric cylindrical step; the step pad (7) is annular and sleeved on the eccentric shaft (2).

4. A compact RV reducer according to claim 2, characterized in that: The outer end surface of the inner ring (402) of the roller bearing (4) is provided with a plurality of connecting screw holes, the connecting screw holes are connected to the output disc (6) via second screws (601), and the output disc (6) is connected to the eccentric shaft (2) via the second bearing (602); The end surface of the output disk (6) is provided with a plurality of first pin screw holes (604), and the output disk (6) is connected to the load via the first pin screw holes (604); A step pad (7) is provided between the second bearing (602) and the eccentric cylindrical step; the step pad (7) is annular and sleeved on the eccentric shaft (2).

5. A compact RV reducer according to claim 4, characterized in that: A second sealing ring (102) is provided between the housing (1) and the eccentric shaft (2), and a third sealing ring (603) is provided between the output disc (6) and the eccentric shaft (2); The second sealing ring (102) and the third sealing ring (603) are located closest to the end of the eccentric shaft (2).

6. A compact RV reducer according to claim 1, characterized in that: The eccentric shaft (2) is provided with an axial through hole; External screw holes are provided on both end surfaces of the eccentric shaft (2).

7. A compact RV reducer according to claim 4, characterized in that: A section of the first pin screw hole (604) on the output disk (6) is a pin hole, and a section of the first pin screw hole (604) on the inner ring (402) is a screw hole.

8. A compact RV reducer according to any one of claims 1 to 7, characterized in that: The outer ring (401) of the roller bearing (4) is provided with first screw holes evenly distributed along the circumference, and the inner ring (402) of the roller bearing (4) is provided with second screw holes evenly distributed along the circumference; The first screw hole and the second screw hole face in opposite directions respectively; A step for positioning is provided on an end surface of the outer ring (401) close to the first screw hole; A step for positioning is provided on the end surface of the inner ring (402) close to the second screw hole; The inner wall of the outer ring (401) and the outer wall of the inner ring (402) are provided with inclined grooves, and rollers (403) are arranged crosswise in the grooves. The axes of the rollers (403) intersect with the axis of the distribution circle at an angle of 45°, and the intersection points of the axes of adjacent rollers (403) and the axis of the distribution circle are located on both sides of the distribution circle. The length of the roller (403) is smaller than the diameter of the roller (403).

9. A roller bearing for a compact RV reducer according to any one of claims 1 to 8, characterized in that: The outer ring (401) of the roller bearing (4) is provided with first screw holes evenly distributed along the circumference, and is used for connecting with the housing (1); The inner ring (402) of the roller bearing (4) is provided with second screw holes evenly distributed along the circumference, for connecting with a load; The first screw hole and the second screw hole face in opposite directions respectively; A step for positioning is provided on an end surface of the outer ring (401) close to the first screw hole; A step for positioning is provided on the end surface of the inner ring (402) close to the second screw hole.

10. A roller bearing for a compact RV reducer according to claim 9, characterized in that: The inner wall of the outer ring (401) and the outer wall of the inner ring (402) are provided with inclined grooves, and rollers (403) are arranged crosswise in the grooves. The axes of the rollers (403) intersect with the axis of the distribution circle at an angle of 45°, and the intersection points of the axes of adjacent rollers (403) and the axis of the distribution circle are located on both sides of the distribution circle. The length of the roller (403) is smaller than the diameter of the roller (403), and the value is 0.01 mm to 0.1 mm; A first sealing ring (404) is also provided between the outer ring (401) and the inner ring (402); A plurality of output shaft pin insertion holes (405) are provided on a section of the inner ring (402) away from the second screw hole for connecting the output shaft pin (5).

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