A test bench for RV reducer

Abstract

The present application relates to the technical field of mechanical transmission testing equipment, and particularly relates to an RV reducer testing test bench, which comprises a test piece tool fixed to a platform unit, and a driving assembly and a loading assembly arranged on both sides of the test piece tool and capable of sliding relative to the platform unit. The present application adopts the test piece tool which is specially used for the fixation of the RV reducer, and the test piece tool has a simple structure and is installed in position with the RV reducer through a stop opening, so that quick and high-precision installation can be realized. The main shafts in the driving assembly and the loading assembly which are rigidly connected with the RV reducer are positioned and fixed by bearing seats, so that the coaxiality of the RV reducer and the main shafts on both sides and the smooth operation of the mechanism during the test are ensured. Moreover, the torque meter and the grating sensor are fixedly connected with the main shafts, so that the precision of the test is maximally improved, and the quality of the RV reducer is ensured.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission testing technology and equipment, and in particular to a test bench for RV reducers. Background Technology

[0002] With the rapid development of automation technology and robotics, RV reducers are being used more and more widely, and the requirements for their precision and functional quality are also increasing. To meet these technical requirements, domestic manufacturers are accelerating the development of high-performance RV reducers. RV reducer testing benches are crucial equipment for verifying whether developed RV reducers meet quality requirements. Existing RV testing benches typically mount the RV reducer directly on the drive end, and the connection fixtures are complex, which is detrimental to improving the accuracy of the testing bench. Therefore, this paper aims to provide an RV reducer testing bench that is easy to install and guarantees accuracy. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an RV reducer testing bench. The bench is equipped with a separate fixture to clamp the RV reducer to be tested, and movable drive ends and loading ends are provided on both sides. The RV reducer fixture is simple, and the coaxiality with the main shafts on both sides can be ensured by adjustment, so that the rigid connection accuracy between the RV reducer to be tested and the main shafts on both sides is guaranteed, thereby improving the testing accuracy of the bench.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a connection fixture for an RV reducer and a test bench, including a mounting bracket connected to the platform unit by screws. The upright plate of the mounting bracket is provided with a mounting hole. A mounting flange is coaxially installed in the mounting hole and fixed with a ring of screws. The inner hole of the mounting flange fits into one end of the rigid outer sleeve of the RV reducer. A sealing flange fits into the other end of the rigid outer sleeve of the RV reducer. The sealing flange, the middle protrusion of the rigid outer sleeve of the RV reducer, and the mounting flange are provided with long screws that pass through the three to fix them together. The mounting flange and the sealing flange are both fitted and positioned with the RV reducer through an inner stop. A sealing ring one is provided on the connection surface between the sealing flange and the RV reducer. The sealing flange is provided with an oil filler. The input end of the RV reducer is keyed to an input connection flange shaft that passes through the center hole of the sealing flange. A sealing ring two is provided between the input connection flange shaft and the sealing flange. The output end of the RV reducer is connected to an output connection flange by screws.

[0005] Preferably, the input connecting flange shaft is T-shaped, with one end being a disc flange; the output connecting flange is I-shaped, with both ends being disc flanges, wherein the disc flange connected to the RV reducer is provided with an inner stop for connection and fitting with the RV reducer.

[0006] Preferably, the present invention also provides a test bench for an RV reducer, which adopts the above-mentioned connection fixture between the RV reducer and the test bench (hereinafter referred to as the test fixture), including a drive assembly disposed at the input end of the test fixture and a loading assembly disposed at the output end of the test fixture, wherein both the drive assembly and the loading assembly are slidably connected to the platform unit.

[0007] Preferably, the drive assembly includes a mounting base fixed to the platform unit, and a movable base is slidably connected to the mounting base via a slider rail. The movable base is provided with a lead screw drive device, which includes a lead screw driven to rotate by a handwheel. The lead screw is threadedly connected to a lead screw nut fixed to the movable base.

[0008] Preferably, the drive assembly further includes a drive motor fixed to the movable base. The output shaft of the drive motor is connected to a drive spindle via a coupling. A torque meter is fixedly connected to the other end of the drive spindle. The output end of the torque meter is fixedly connected to the flange end of the input connection flange shaft via a transition flange. A drive grating of a grating sensor is fixedly connected to the outer sleeve of the transition flange. The reading heads of the torque meter and the grating sensor are both fixed to the movable base.

[0009] Preferably, the coupling is a laminated flexible coupling.

[0010] The loading assembly and the driving assembly have basically the same structure and are symmetrically arranged on both sides of the test piece tooling.

[0011] Preferably, the drive spindle is T-shaped and disposed in the drive spindle assembly, wherein the flange end is fixedly connected to the torque meter, the drive spindle assembly includes a bearing housing fixedly connected to the movable base, two bearings are rotatably connected to the bearing housing and fitted around the drive spindle, an inner spacer and an outer spacer are provided between the two bearings and fitted coaxially, a spacer that abuts against the inner ring of the bearing and a bearing cap that abuts against the outer ring of the bearing and is fixedly connected to the bearing housing on the outer side of each of the two bearings, and a locking nut that prevents the drive spindle from moving axially is threaded to the non-flange end of the drive spindle.

[0012] Preferably, the end flange of the drive spindle has a flat surface cut out on its outer periphery, and the bearing housing is fixed with a stall block that fits against the flat surface to prevent the drive spindle from rotating by screws.

[0013] Preferably, the bearing housing is equipped with a temperature sensor for detecting the temperature of the internal lubricating oil.

[0014] Preferably, the platform unit is provided with a plurality of adjustment blocks, and each adjustment block is threadedly connected to a micro-adjustable tooling and bolts for mounting the left and right positions of the base.

[0015] Preferably, the movable base is provided with a plurality of adjustment blocks II, the adjustment blocks II being threadedly connected to finely adjust the position of the drive motor relative to the movable base (front-back, left-right) and the position of the bearing seat relative to the movable base (left-right).

[0016] The beneficial effects of this invention are as follows: An RV reducer testing bench includes a test piece fixture fixed to a platform unit, and a drive assembly and a loading assembly disposed on both sides of the test piece fixture and slidable relative to the platform unit. This invention uses a test piece fixture specifically for fixing the RV reducer. The test piece fixture has a simple structure and is positioned and installed with the RV reducer through a stop, enabling rapid and high-precision installation. The main shafts in the drive assembly and loading assembly, which are rigidly connected to the RV reducer, are positioned and fixed using bearing seats, ensuring the coaxiality of the RV reducer and the two main shafts, as well as the smooth operation of the mechanism during testing. Furthermore, the torque meter and grating sensor are both fixedly connected to the main shaft, thereby maximizing the accuracy of the test and ensuring the quality of the RV reducer. Attached Figure Description

[0017] Figure 1 This is a perspective view of an RV reducer test bench according to the present invention;

[0018] Figure 2 This is a perspective view of the drive assembly;

[0019] Figure 3 This is a cross-sectional view of the specimen tooling;

[0020] Figure 4 This is a three-dimensional view of the drive spindle assembly;

[0021] Figure 5 This is a cross-sectional plan view of the drive spindle assembly.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1—Platform Unit, 2—Test Piece Fixture, 201—Mounting Bracket, 202—Mounting Hole, 203—Mounting Flange, 204—RV Reducer, 205—Sealing Flange, 206—Long Screw, 207—Sealing Ring I, 208—Oil Nozzle, 209—Input Connection Flange Shaft, 210—Sealing Ring II, 211—Output Connection Flange, 3—Drive Assembly, 301—Mounting Base, 302—Moving Base, 303—Screw Drive Device, 304— —Drive motor, 305—Coupling, 306—Drive spindle, 307—Torque meter, 308—Transition flange, 309—Raster sensor, 4—Drive spindle assembly, 401—Bearing housing, 402—Bearing, 403—Inner spacer, 404—Outer spacer, 405—Spacer, 406—Bearing cover, 407—Locking nut, 408—Stalled block, 409—Temperature sensor, 5—Loading assembly, 6—Adjusting block one, 7—Adjusting block two. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0025] like Figure 1-5 As shown, an RV reducer test bench of this embodiment includes a platform unit 1. A test piece fixture 2 for clamping an RV reducer 204 is fixed in the middle of the platform unit 1. A drive assembly 3 for applying drive to the RV reducer 204 and a loading assembly 5 for applying load are set at both ends.

[0026] The platform unit 1 is an operating table equipped with a large number of tool cabinets, which plays a role in bearing and supporting in this embodiment.

[0027] The specimen fixture 2 includes a mounting bracket 201 that is screwed to the platform unit 1. The upright plate of the mounting bracket 201 has a mounting hole 202. A mounting flange 203 is coaxially mounted in the mounting hole 202 and fixed with a ring of screws. The inner hole of the mounting flange 203 fits into one end of the rigid outer sleeve of the RV reducer 204. The other end of the rigid outer sleeve of the RV reducer 204 is fitted with a sealing flange 205. The sealing flange 205, the middle protrusion of the rigid outer sleeve of the RV reducer 204, and the mounting flange 203 are provided with long screws 206 that penetrate through all three to fix them together. Both the mounting flange 203 and the sealing flange 205 are fitted and positioned with the RV reducer 204 through an inner stop. A sealing ring 207 is provided on the connection surface between the sealing flange 205 and the RV reducer 204. The sealing flange 205 is provided with an oil filler 208. The input end of the RV reducer 204 is keyed to an input connection flange shaft 209 that passes through the center hole of the sealing flange 205. A sealing ring 210 is provided between the input connection flange shaft 209 and the sealing flange 205. The output end of the RV reducer 204 is connected to an output connection flange 211 by screws. When installing the RV reducer 204, the RV reducer 204 can be quickly positioned and installed through the inner stop of the mounting flange 203, and then fixed using the long screws 206. This makes the RV reducer 204 and the test piece fixture 2 a whole and independent unit, unaffected by external moving parts, and easy to clamp.

[0028] The platform unit 1 is provided with a drive assembly 3 and a loading assembly 5 on both sides of the specimen fixture 2. The drive assembly 3 is connected to the input end (inner ring gear) of the RV reducer 204. The loading assembly 5 has the same structural and functional units as the drive assembly 3, but with different power configurations. The drive assembly 3 and the loading assembly 5 are symmetrically arranged with respect to the specimen fixture 2 in terms of functional units, but both the drive assembly 3 and the loading assembly 5 are slidably connected to the platform unit 1, and the distance between them and the specimen fixture 2 is adjustable.

[0029] The drive assembly 3 includes a mounting base 301 fixed to the platform unit 1. A movable base 302 is slidably connected to the mounting base 301 via a slider rail. The movable base 302 is equipped with a lead screw drive device 303, which includes a lead screw driven to rotate by a handwheel. The lead screw is threadedly connected to a lead screw nut fixed to the movable base 302. Rotating the handwheel adjusts the distance between the drive assembly 3 and the specimen fixture 2.

[0030] The loading assembly 5 is directly slidably connected to the platform unit 1 via a slider rail, and its movement is controlled by a lead screw drive device 303 located on the platform unit 1. Furthermore, the platform unit 1 is also equipped with a locking mechanism that can fix the driving assembly 3 and the loading assembly 5 after their positions have been adjusted.

[0031] The drive assembly 3 also includes a drive motor 304 fixed to the movable base 302. The output shaft of the drive motor 304 is connected to a drive spindle 306 via a coupling 305. The other end of the drive spindle 306 is fixedly connected to a torque meter 307. The output end of the torque meter 307 is fixedly connected to the flange end of the input connection flange shaft 209 via a transition flange 308. The transition flange 308 has a drive grating of a grating sensor 309 fitted and fixedly connected to it. The reading heads of the torque meter 307 and the grating sensor 309 are both fixed to the movable base 302.

[0032] To improve the stability of the drive spindle 306 and ensure its coaxiality with the RV reducer 204, this embodiment includes a drive spindle assembly 4, with the drive spindle 306 mounted on it. The drive spindle 306 is T-shaped, with its flange end fixedly connected to the torque meter 307. The drive spindle assembly 4 includes a bearing housing 401 fixedly connected to the movable base 302. Two bearings 402 are rotatably fitted around the drive spindle 306 and connected to the bearing housing 401. An inner spacer 403 and an outer spacer 404 are coaxially fitted between the two bearings 402. Each bearing 402 has a spacer 405 that abuts against the inner ring of the bearing 402, and a bearing cap 406 that abuts against the outer ring of the bearing 102 and is fixedly connected to the bearing housing 401. A locking nut 407 is provided at the non-flange end of the drive spindle 306 to prevent axial movement of the drive spindle 306. In addition, the bearing housing 401 is provided with a temperature sensor 409 for detecting the temperature of the internal lubricating oil.

[0033] To facilitate the installation of the test piece fixture 2, the drive assembly 3, and the load assembly 5, or after long-term operation, the accuracy of the test bench needs to be readjusted. To make this operation easier, the platform unit 1 is provided with several adjustment blocks 6. The adjustment blocks 6 are threadedly connected to bolts that can finely adjust the left and right positions of the test piece fixture 2 and the mounting base 301. The movable base 302 is provided with several adjustment blocks 7. The adjustment blocks 7 are threadedly connected to bolts that can finely adjust the front-back and left-right positions of the drive motor 304 relative to the movable base 302, as well as the left and right positions of the bearing seat 401 relative to the movable base 302.

[0034] The operation of this test bench will be explained below using transmission error as an example.

[0035] First, fix the RV reducer 204 to the test piece fixture 2 using the long screw 206, and install the input connection flange shaft 209 and the output connection flange 211; then adjust the drive assembly 3 and the load assembly 5 so that the transition flange 308 of the drive assembly 3 abuts against the input connection flange shaft 209 and is fixed with screws, and make the transition flange of the load assembly 5 abut against the output connection flange 211 and also fix it with screws.

[0036] Before securing the three components with screws, it is necessary to prevent the drive spindle 306 from rotating in order to facilitate screw installation. Therefore, the outer circumference of the end flange of the drive spindle 306 is cut with a flat surface. The bearing housing 401 is secured with a stall block 408 that conforms to this flat surface to prevent the drive spindle 306 from rotating. After the screws are installed, the stall block 408 is removed.

[0037] The drive assembly 3 is started, driving the RV reducer 204 to rotate, which in turn drives the main shaft of the load assembly 5 to rotate. The rotation angle data of the grating sensor 309 at the drive end, i.e., the input indicating arbitrary rotation angle (θin), and the rotation angle data of the grating sensor 309 at the load end, i.e., the actual output rotation angle (θout), are recorded respectively. According to the transmission error formula θer=θin / R-θout (R: speed ratio value), the transmission error between the theoretical output rotation angle and the actual output rotation angle of the RV reducer 204 can be obtained.

[0038] Let's take the no-load torque test as an example to illustrate.

[0039] The stall block 408 is used to prevent the drive spindle 306 of the drive assembly 3 from rotating. The position of the drive assembly 3 is adjusted to fix the transition flange 308 to the input connection flange shaft 209, thereby fixing the drive spindle 306 of the drive assembly 3 to the input end of the RV reducer 204, and this connection is rigid. In this experiment, the output end of the RV reducer 204 is unloaded, i.e., not connected to the load assembly 5. Then, the RV reducer 204 is slowly started through the drive assembly 3, and the real-time torque is recorded. The sampling rate is not less than 1kHz (i.e., the signal acquisition frequency). The instantaneous maximum input torque is obtained as the no-load starting torque. The input speed torque of the test piece is collected in real time, and the speed-torque curve is plotted until the speed stabilizes.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and for the convenience of describing the technical solutions, the front, back, left, right, top, middle, and bottom orientations are based on the accompanying drawings and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A test bench for RV reducers, characterized in that: It includes a test piece fixture, a drive assembly located at the input end of the test piece fixture, and a loading assembly located at the output end of the test piece fixture. Both the drive assembly and the loading assembly are slidably connected to the platform unit. The drive assembly includes a mounting base fixed to the platform unit. The mounting base is slidably connected to a movable base via a slider rail. The movable base is equipped with a lead screw drive device. The lead screw drive device includes a lead screw driven to rotate by a handwheel. The lead screw is threadedly connected to a lead screw nut fixed to the movable base. The drive assembly also includes a drive motor fixed to the movable base. The output shaft of the drive motor is connected to a drive spindle via a coupling. The other end of the drive spindle is fixedly connected to a torque meter. The output end of the torque meter is fixedly connected to the flange end of the input connection flange shaft via a transition flange. The transition flange is fitted with and fixedly connected to a drive grating of a grating sensor. The reading heads of the torque meter and the grating sensor are both fixed to the movable base. The drive spindle is T-shaped and is located in the drive spindle assembly. The flange end is fixedly connected to the torque meter. The drive spindle assembly includes a bearing housing fixedly connected to the movable base. Two bearings are rotatably connected to the bearing housing and fitted around the drive spindle. An inner spacer and an outer spacer are coaxially fitted between the two bearings. A spacer that abuts against the inner ring of the bearing and a bearing cap that abuts against the outer ring of the bearing and is fixedly connected to the bearing housing are provided on the outer side of each of the two bearings. A locking nut that prevents the drive spindle from moving axially is threaded to the non-flange end of the drive spindle.

2. The RV reducer test bench according to claim 1, characterized in that: The test piece fixture includes a mounting bracket that is screwed to the platform unit. The upright plate of the mounting bracket has a mounting hole. A mounting flange is coaxially mounted in the mounting hole and fixed with a ring of screws. The inner hole of the mounting flange fits into one end of the rigid outer sleeve of the RV reducer. A sealing flange fits into the other end of the rigid outer sleeve of the RV reducer. The sealing flange, the middle protrusion of the rigid outer sleeve of the RV reducer, and the mounting flange are fixedly connected by long screws that pass through them. The mounting flange and the sealing flange are both fitted and positioned with the RV reducer through inner stops. A sealing ring one is provided on the connection surface between the sealing flange and the RV reducer. The sealing flange is provided with an oil filler. The input end of the RV reducer is keyed to an input connection flange shaft that passes through the center hole of the sealing flange. A sealing ring two is provided between the input connection flange shaft and the sealing flange. The output end of the RV reducer is connected to an output connection flange by screws.

3. The RV reducer test bench according to claim 2, characterized in that: The input connection flange shaft is T-shaped, with one end being a disc flange; the output connection flange is I-shaped, with both ends being disc flanges, wherein the disc flange connected to the RV reducer is provided with an inner stop for connection and fitting with the RV reducer.

4. The RV reducer test bench according to claim 1, characterized in that: The end flange of the drive spindle has a flat surface cut out on its outer circumference, and the bearing housing is fixed with a stall block that fits against the flat surface to prevent the drive spindle from rotating by screws.

5. The RV reducer test bench according to claim 1, characterized in that: The bearing housing is equipped with a temperature sensor to detect the temperature of the internal lubricating oil.

6. The RV reducer test bench according to claim 1, characterized in that: The platform unit is provided with several adjustment blocks, and each adjustment block is threadedly connected to a micro-adjustable tooling and bolts for mounting the left and right positions of the base.

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