Cycloidal steel ball transmission bearing reducer with pinwheel output

Abstract

The present invention discloses a cycloidal steel ball transmission bearing reducer with a pinwheel output, which relates to the field of transmission devices with elements having orbital motion, and includes a circlip for hole, a support bearing, a stud disc, an O-ring seal, a cycloid gear, a needle roller bearing, an eccentric bushing, a pin tooth housing, a stud, a bushing and a steel ball. Two support bearings support the input shaft; the steel balls in the pin tooth housing serve as both the pin teeth of the reducer and the rolling elements of the bearing; the pin tooth housing and the stud disc are sealed with an O-ring seal; two cycloid gears are supported by needle roller bearings between a set of eccentric bushings; the stud and the bushing mounted on the stud are both independent components. This device adopts a structure combining a bearing and a reducer, and rolling elements are arranged in the pin tooth housing, reducing the frictional resistance. It can not only effectively prevent the pin tooth housing from heating up, but also enable the planetary motion of the cycloid gear to be more smoothly converted into the rotation of the pin tooth housing for direct output, with higher transmission efficiency and lower cost.

Description

Technical Field

[0001] The present invention relates to the field of transmissions with elements having orbital motion, specifically a cycloidal steel ball transmission bearing reducer with a pinwheel output. Background Art

[0002] In traditional mechanical structures, a reducer and a bearing are two independent components, requiring independent manufacturing and installation. Moreover, they have relatively high requirements for installation space, which is not conducive to reducing the volume of machinery, and the installation cost is relatively high. Therefore, a new type of cycloidal steel ball transmission bearing reducer with a pinwheel output is needed to combine the two components of the reducer and the bearing, effectively reducing the volume size and installation cost.

[0003] To solve the above problems, engineers have designed some bearing reducers. For example, a Chinese patent with the application number 201910257147.1 discloses a reducer based on an RV bearing, which includes a main shaft, planetary gears, crankshafts, RV bearings, a housing, and a cycloidal pinwheel; the housing is a hollow cylindrical structure, and the main shaft is coaxially arranged at the geometric center of the housing; three crankshafts are arranged in parallel to the main shaft with equal radian on a circle centered on the main shaft; a planetary gear is fixedly arranged at the lower end of each crankshaft, and a gear is fixedly arranged at the lower end of the main shaft, and the gear meshes with all the planetary gears; two RV bearings are fixedly sleeved on each crankshaft, and two cycloidal pinwheels are sleeved on the main shaft. The positions of the cycloidal pinwheels on the crankshafts have holes, and the crankshafts pass through the holes, and the two RV bearings on each crankshaft are both located in the holes of the cycloidal pinwheels; internal teeth meshing with the edges of the cycloidal pinwheels are arranged on the inner side wall of the housing, and the cycloidal pinwheel set meshes with the internal teeth. Although this bearing reducer improves the bearing capacity of the reducer, its application range is relatively narrow and it is only applicable to RV bearings.

[0004] A Chinese patent with the application number 201710346384.6 discloses a curved surface cycloidal steel ball planetary transmission reducer, which includes an input shaft, an eccentric sleeve, a pinwheel, an output shaft, a stud and a stud sleeve, and also includes a curved surface cycloidal gear and steel balls; the curved surface cycloidal gear is an inner concave spherical envelope curved surface cycloidal tooth profile. There are two groups of curved surface cycloidal gears, which are mirror-symmetrical, and each group has 2 pieces and the phase difference is 180°; the pinwheel uses 4 groups of steel balls as pin teeth to mesh with the curved surface cycloidal gears; the curved surface cycloidal gears are installed on the eccentric sleeve, and the eccentric sleeve is connected to the input shaft. The curved surface cycloidal gears are in contact with the stud and the stud sleeve, and the stud and the stud sleeve pass through the round holes on the curved surface cycloidal gears; the output shaft is connected to the pinwheel. Although this technical solution is also a reducer using pin tooth transmission, it is not combined with a bearing, resulting in a low transmission efficiency. In addition, its curved surface cycloidal gears have relatively high requirements for installation accuracy, and the installation cost is also relatively high. Summary of the Invention

[0005] The purpose of the present invention is to provide a cycloidal steel ball transmission bearing reducer with a pinwheel output to solve the problems pointed out in the above background art.

[0006] To achieve the above object, the following technical solutions are adopted:

[0007] A cycloidal steel ball transmission bearing reducer with a pinwheel output, comprising a hole-type circlip, a support bearing, a stud disc, an O-ring seal, a cycloid gear, a needle roller bearing, an eccentric bushing, a pin gear housing, a stud, a bushing, and a steel ball. Two support bearings support the input shaft; the steel balls in the pin gear housing serve both as the pin teeth of the reducer and as the rolling elements of the bearing; the pin gear housing and the stud disc are sealed by an O-ring seal; the cycloid gear and the eccentric bushing are supported by a needle roller bearing.

[0008] Preferably, there are four cycloid gears in the whole device.

[0009] Preferably, the stud and the rotatable bushing mounted on the stud are two independent parts.

[0010] Further improved, the input shaft and the eccentric bushing are connected by a spline.

[0011] Method for installing a cycloidal steel ball transmission bearing reducer with a pinwheel output:

[0012] First, confirm whether all the parts for installation are complete;

[0013] Second, sleeved two groups of cycloid gears on the eccentric bushing respectively; installed two groups of circlips on the eccentric bushing respectively to play an axial positioning role for the bearing;

[0014] Third, sleeved six groups of studs and bushings together and fixed them on the stud disc one by one;

[0015] Fourth, sealed the installed stud disc and a group of needle roller bearings with an O-ring seal;

[0016] Fifth, sleeved the eccentric bushing in the pin gear housing;

[0017] Sixth, fixed the stud disc and the pin gear housing together;

[0018] Seventh, fixed the support bearings on the stud disc side and the pin gear housing respectively, and provided a certain tension through the circlip;

[0019] Eighth, drilled a radial through-hole on the pin gear housing and machined an internal thread for installing a set screw on the upper part of the through-hole, then assembled the steel ball into the through-hole radially, installed a spring on the upper part of the steel ball, installed a set screw on the upper part of the spring, and screwed the set screw into the radial through-hole for installing the steel ball on the pin gear housing. After the installation of the set screw is completed, it shall not protrude beyond the outer cylindrical surface of the pin gear housing;

[0020] Finally, check the installation of the whole device.

[0021] The beneficial effects of the present invention are as follows: By adopting a structure combining a bearing and a speed reducer, rolling elements are arranged in the pin gear housing, and rolling friction is used to replace sliding friction, reducing the frictional resistance. This can not only effectively prevent the pin gear housing from heating up, but also enable the planetary motion of the cycloid wheel to be more smoothly converted into the rotation of the pin gear housing, and then complete the direct output. This device has outstanding advantages such as simple structure, high precision, high transmission efficiency, and low manufacturing cost as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the structural exploded view of the present invention;

[0023] Figure 2 is the structural diagram of the set screw and the spring;

[0024] Figure 3 is the assembly schematic diagram of the input end of the embodiment of the present invention;

[0025] Figure 4 is the assembly schematic diagram of the output end of the embodiment of the present invention.

[0026] In the figure: 1. Hole retaining ring, 2. Support bearing, 3. Stud disc, 4. O-ring seal, 5. Cycloid wheel, 6. Needle roller bearing, 7. Eccentric bushing, 8. Pin gear housing, 9. Stud, 10. Bush, 11. Steel ball, 12. Set screw, 13. Spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further explained and described in detail below in conjunction with the drawings and embodiments.

[0028] Embodiment: Please refer to Figures 1-4 , a cycloidal steel ball transmission bearing speed reducer with pin gear output, including a hole retaining ring 1, a support bearing 2, a stud disc 3, an O-ring seal 4, a cycloid wheel 5, a needle roller bearing 6, an eccentric bushing 7, a pin gear housing 8, a stud 9, a bush 10, and a steel ball 11. Two support bearings 2 support the input shaft; the steel balls 11 in the pin gear housing 8 serve both as the pin teeth of the speed reducer and as the rolling elements of the bearing; the pin gear housing 8 and the stud disc 3 are sealed by an O-ring seal 4; the cycloid wheel 5 and the eccentric bushing 7 are supported by a needle roller bearing 6, and there are a total of four cycloid wheels 5. The stud 9 and the bush 10 rotatably mounted on the stud are two mutually independent parts.

[0029] Working principle: First, directly insert the input shaft into the eccentric bushing 7 and connect them through splines. When the input shaft rotates, under the action of the eccentric bushing 7, the cycloid gear 5 at the other end of the eccentric bushing 7 will revolve around the pin gear housing 8. And the cycloid gear 5 will rotate around its own axis under the meshing action with the steel ball 11. However, due to the relative stationary state of the stud disk 3 and the stud 9, the angular velocity of the cycloid gear 5 rotating around its own axis is actually restricted. Therefore, in fact, the cycloid gear 5 can only perform planar motion in the plane perpendicular to the plane where the stud 9 is located. The meshing transmission between the cycloid gear 5 and the steel ball 11 completes the planetary transmission of the pin-cycloid part. At the same time, there is also meshing transmission between the steel ball 11 and the pin gear housing 8, so that the pin gear housing 8 is used as the output component to output power externally.

Claims

1. Cycloidal steel ball transmission bearing reducer with pinwheel output, comprising a pin disk (3), an O-ring seal (4), a cycloid gear (5), an eccentric bushing (7), pins (9), and bushing sleeves (10), characterized in that: It also includes a hole retaining ring (1), a support bearing (2), a needle roller bearing (6), a pin gear housing (8), and steel balls (11). The two support bearings (2) support the input shaft; the steel balls (11) inside the pin gear housing (8) serve both as the pin teeth of the speed reducer and the rolling elements of the bearing. The pin gear housing (8) and the stud disc (3) are sealed by an O-ring (4). The cycloid gear (5) and the eccentric bushing (7) are supported by a needle roller bearing (6). The input shaft and the eccentric bushing (7) are connected by a spline. The method for installing the cycloidal steel ball transmission bearing speed reducer with pin wheel output includes the following steps: S1: Confirm whether all the installation parts are complete. S2: Slide two groups of cycloid gears (5) onto two groups of needle roller bearings (6) and eccentric bushings (7) respectively; install two groups of retaining rings on the support bearings (2) respectively. S3: Sleeve six groups of studs (9) and bushings (10) together and fix them one by one on the stud disc (3). S4: Seal the installed stud disc (3) and a group of needle roller bearings (6) with an O-ring (4). S5: Slide the eccentric bushing (7) into the pin gear housing (8). S6: Fix the stud disc (3) and the pin gear housing (8) together. S7: Fix the support bearings (2) on the side of the stud disc (3) and the pin gear housing (8) respectively. S8: Drill a radial through-hole in the pin gear housing (8), machine an internal thread for installing a set screw (12) at the upper part of the through-hole, assemble the steel balls (11) into the through-hole radially, install a spring (13) on the upper part of the steel balls (11), install the set screw (12) on the upper part of the spring (13), and screw the set screw (12) into the radial through-hole for installing the steel balls (11) on the pin gear housing (8). After the set screw (12) is installed, it shall not protrude beyond the outer cylindrical surface of the pin gear housing (8). S9: Check the installation of the entire device.

2. The cycloidal steel ball transmission bearing reducer with pinwheel output according to claim 1, characterized in that: The bearing speed reducer has a total of four cycloid gears (5).

3. The cycloidal steel ball transmission bearing reducer with pinwheel output according to claim 1, characterized in that: The stud (9) and the rotatable bushing (10) installed on the stud (9) are two independent parts.

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