Transmission assembly and hub speed reducer with same

Abstract

The utility model relates to the technical field of speed reducers, in particular to a transmission assembly and a hub speed reducer with the transmission assembly. The speed reducer is driven by the motor to rotate, in a limited space in the speed reducer, through meshing of the spherical roller and the cycloid curve track groove, primary or secondary speed reduction transmission can exist, and the hub outputs the rotating speed and torque. The internal structure of the whole hub speed reducer is compact, and the overall structure size is small, so that the hub speed reducer is suitable for various occasions, especially occasions with small space, such as a speed reducer in a mechanical arm, or serves as a wheel of an AGV and serves as advancing power of the AGV. According to the hub speed reducer, the installation space is saved, vibration generated in the transmission process is reduced, and the transmission efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of speed reducer, more specifically relates to a transmission assembly and have its wheel hub speed reducer. BACKGROUND

[0002] The wheel hub speed reducer is a device that can achieve the effect of speed reduction and torque increase, and is usually installed in the wheel hub of a vehicle. It can convert the high-speed rotation of the motor into low-speed high-torque output of the wheel hub, thereby driving the vehicle to run. Since the vehicle equipped with the wheel hub speed reducer does not need a gearbox and a main reducer, the chassis can be made simpler, the height of the chassis of the vehicle can be increased, and the passability of the vehicle under off-road conditions can be improved.

[0003] In structure, the wheel hub speed reducer is usually composed of a sun gear, a planet gear, an inner ring gear, a planet carrier and the like. These parts realize the conversion of the high-speed rotation of the motor into the low-speed high-torque output of the wheel hub through precise gear meshing and transmission.

[0004] However, such planetary transmission will result in a relatively large radial dimension and axial dimension of the entire speed reducer, and such a speed reducer is not suitable for some occasions with small space. If the input rotation speed is too high, it will also cause excessive vibration during transmission and reduce the transmission efficiency of the entire machine. CONTENT OF THE UTILITY MODEL

[0005] The utility model provides a transmission assembly and have its wheel hub speed reducer, the purpose is can save installation space, reduce the vibration produced in transmission process, improve transmission efficiency.

[0006] The above-mentioned purpose is realized by the following technical scheme:

[0007] A transmission assembly, characterized by:

[0008] The shaft comprises an intermediate ring bearing inner ring matching surface formed on the outer circumferential surface of the shaft, and the axis of the intermediate ring bearing inner ring matching surface and the central rotation axis of the shaft have a spacing;

[0009] The intermediate ring is rotatably connected to the shaft through a first bearing, the inner ring of the first bearing is matched on the intermediate ring bearing inner ring matching surface, the left end of the intermediate ring is uniformly distributed with a plurality of first ball sockets, each first ball socket is provided with a first spherical roller, and the right end of the intermediate ring is uniformly distributed with a first trajectory groove formed by a trochoid curve;

[0010] The output disc is rotatably connected to the left part of the outer circumferential surface of the shaft through a second bearing, and the output disc is meshed and transmitted with the first spherical roller;

[0011] The rear cover is rotatably connected to the shaft via a third bearing. The left end face inside the rear cover has three evenly distributed third ball sockets. Each third ball socket contains a second spherical roller, which meshes with a first track groove. The number of third ball sockets is at least one more than the number of teeth in the first track groove.

[0012] The right end of the output disk has a second track groove formed by a cycloidal curve. The first spherical roller meshes with the second track groove. The number of the first ball sockets is at least one more than the number of teeth in the second track groove. Alternatively, the right end face of the output disk is replaced by the second track groove with circumferentially distributed second ball sockets. The position and number of the second ball sockets correspond one-to-one with the position and number of the first ball sockets, so that the first ball socket and the second ball socket at the corresponding positions contain the same spherical roller.

[0013] A hub reducer includes a transmission assembly and a housing rotatably connected to a rear cover via a fourth bearing, wherein the output disc is detachably connected to the housing by bolts.

[0014] It also includes a motor mount, which is detachably connected to the rear cover via bolts.

[0015] A first sealing ring is installed between the rear cover, the housing, and the motor base, and a second sealing ring is installed between the shaft, the rear cover, and the motor base. The outer peripheral end face of the output disc fits against the inner end face of the housing to form a seal.

[0016] The beneficial effects of this utility model of a transmission component and a hub reducer having the same are as follows:

[0017] Driven by a motor, the reducer can accommodate single or two-stage speed reduction within its limited internal space, with the hub outputting speed and torque. The entire hub reducer boasts a compact internal structure and small overall dimensions, making it suitable for various applications, especially those with limited space, such as as a reducer inside a robotic arm or as the wheels of an AGV (Automated Guided Vehicle) for propulsion. This hub reducer saves installation space, reduces vibration during transmission, and improves transmission efficiency. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the hub reducer;

[0019] Figure 2 This is a schematic diagram of the shaft structure;

[0020] Figure 3 This is a side view of the axis;

[0021] Figure 4 This is a cross-sectional view of the shaft;

[0022] Figure 5 Schematic diagram of the middle ring structure Figure 1 ;

[0023] Figure 6 Structure diagram of intermediate ring Figure 2 ;

[0024] Figure 7 Structure diagram of output disc

[0025] Figure 8 Structure diagram of output disc

[0026] Figure 9 Structure diagram of rear cover Figure 1 ;

[0027] Figure 10 Structure diagram of rear cover Figure 2 ;

[0028] Figure 11 Front view of rear cover

[0029] Figure 12 Structure diagram of housing

[0030] Figure 13 Structure diagram of motor base Figure 1 ;

[0031] Figure 14 Structure diagram of motor base Figure 2 ;

[0032] Figure 15 Structure diagram of rubber sleeve

[0033] In the figure: shaft 101; intermediate ring bearing inner ring matching surface 102; intermediate ring 201; first ball socket 202; first track groove 203; output disc 301; second track groove 302; second ball socket 303; rear cover 401; third ball socket 402; housing 501; motor base 601; rubber sleeve 701. DETAILED DESCRIPTION

[0034] A hub reducer, comprising a transmission assembly, the transmission assembly comprising a shaft 101, an intermediate ring 201, an output disc 301 and a rear cover 401. The left side of the outer circumferential surface of the shaft 101 is formed with an intermediate ring bearing inner ring matching surface 102. The axis of the intermediate ring bearing inner ring matching surface 102 is spaced apart from the central rotation axis of the shaft 101, so that the axis of the intermediate ring bearing inner ring matching surface 102 is an eccentric rotation axis. The shaft 101 is a hollow structure, and the inner ring is formed with a key groove. The shaft 101 can be connected with a motor shaft or other transmission shaft through a key to transmit the rotation speed and torque.

[0035] Preferably, an eccentric shaft counterweight is integrally formed on the shaft 101. The function of the eccentric shaft counterweight is to make the center of gravity of the shaft 101 as much as possible on the central rotation axis during rotation, so as to achieve a dynamic balance state and reduce vibration and noise.

[0036] Further, the intermediate ring 201 is rotatably connected to the shaft 101 through a first bearing, and an inner ring of the first bearing is fitted on the intermediate ring bearing inner ring fitting surface 102. The left end of the intermediate ring 201 is circumferentially provided with first ball sockets 202, and each of the first ball sockets 202 is provided with a first spherical roller.

[0037] Further, the output disc 301 is rotatably connected to the left part of the outer circumferential surface of the shaft 101 through a second bearing, and the right end of the output disc 301 is formed with a second track groove 302 formed by a cycloid curve, and the first spherical rollers are engaged with the second track groove 302. The number of the first ball sockets 202 is at least one more than the number of the teeth of the second track groove 302. The movement of the intermediate ring 201 is transmitted to the output disc 301 through the first spherical rollers.

[0038] The right end surface of the output disc 301 can also be replaced by second ball sockets 303 circumferentially distributed on the right end surface of the output disc 301, and the positions and numbers of the second ball sockets 303 correspond one-to-one to the positions and numbers of the first ball sockets 202, so that the first spherical rollers are simultaneously in the first ball sockets 202 and the second ball sockets 303.

[0039] Further, the rear cover 401 is rotatably connected to the shaft 101 through a third bearing. The left end surface inside the rear cover 401 is circumferentially provided with third ball sockets 402. Each of the third ball sockets 402 is provided with a second spherical roller, and the second spherical roller is engaged in the first track groove 203. The number of the third ball sockets 402 is at least one more than the number of the teeth of the first track groove 203.

[0040] Further, the intermediate ring 201 has a circular ring structure, and the left part of the inner wall of the intermediate ring 201 is formed with an intermediate ring shoulder portion abutting against the left part of the outer ring of the first bearing. The right end of the intermediate ring bearing inner ring fitting surface 102 of the shaft 101 is formed with a first shaft shoulder portion abutting against the right part of the inner ring of the first bearing.

[0041] The right end of the output disc 301 is formed with an output disc recess, and the right end of the output disc 301 is formed with an output disc sink groove located in the output disc recess. The output disc 301 is formed with an output disc 301 shoulder portion between the output disc sink groove and the output disc recess, and the output disc 301 shoulder portion abuts against the left part of the outer ring of the second bearing. The left end of the intermediate ring bearing inner ring fitting surface 102 of the shaft 101 is formed with a second shaft shoulder portion abutting against the right part of the inner ring of the second bearing.

[0042] The rear cover 401 covers the upper intermediate ring 201, the outer peripheral end surface of the shaft 101 is formed with a third shaft shoulder part located at the right side of the second shaft shoulder part, the third shaft shoulder part abuts against the left part of the inner ring of the third bearing, the inner end of the rear cover 401 has three circular grooves which are tapered from left to right, forming a stepped groove, and the first rear cover shoulder part is formed in the circular groove at the right part and abuts against the right part of the outer ring of the third bearing.

[0043] The hub reducer further comprises a shell 501 rotatably connected to the rear cover 401 through the fourth bearing, the shell 501 serves as a hub, the intermediate ring 201, the output disc 301 and the rear cover 401 are all accommodated in the shell 501 to form a compact cylindrical structure. The part of the right end surface of the output disc 301 close to the outer ring is formed with threaded holes, the shell 501 is formed with through holes corresponding to the number and position of the threaded holes, the tail part of the bolt is screwed into the threaded hole, the bolt passes through the through hole, and the head part of the bolt abuts against the right end of the shell 501, so that the output disc 301 and the shell 501 are detachably connected through the bolt. The outer peripheral end surface of the output disc 301 and the inner end surface of the shell 501 are attached to form a sealing effect.

[0044] Further, the fourth bearing serves as a hub bearing, the number of the fourth bearing is two and is arranged left and right, the output disc 301 abuts against the left end of the outer ring of the left fourth bearing, the outer peripheral end surface of the rear cover 401 is formed with a second rear cover shoulder part, and the second rear cover shoulder part abuts against the end surfaces of the two fourth bearing inner rings facing each other. The shell 501 abuts against the right end of the outer ring of the right fourth bearing.

[0045] The hub reducer further comprises a motor seat 601, the right end of the motor seat 601 is provided with a motor seat circular recess, the motor seat 601 is formed with a plurality of countersunk holes uniformly distributed in the circular recess, and the end surface of the rear cover 401 matched with the motor seat 601 is provided with a plurality of threaded holes uniformly distributed in the circumference. The countersunk holes and the threaded holes are provided for the bolt to enter, so that the motor seat 601 and the rear cover 401 are detachably connected through the bolt.

[0046] Further, the outer ring of the shell 501 is sleeved with a rubber sleeve 701, which can increase the friction between the shell 501 and the ground, further increase the output torque of the whole machine, make the whole machine run faster as a trolley wheel, avoid slipping and improve the running efficiency. In addition, the rubber sleeve can effectively absorb the impact and vibration generated during operation, and play a protective role for the shell and other parts.

[0047] Working principle of the hub reducer:

[0048] When the end face of the output disc 301 close to one end of the intermediate ring 201 is the second track groove 302, the back cover 401, the intermediate ring 201, the output disc 301, the first spherical roller and the second spherical roller constitute a two-stage speed reduction transmission structure. When working, the shaft 101 is driven to rotate by the motor shaft, the eccentric part of the shaft 101 drives the bearing, i.e. the first bearing, of the intermediate ring 201 to rotate, generating eccentric revolution motion relative to the concentric revolution axis, and further driving the intermediate ring 201 to generate eccentric revolution motion relative to the concentric revolution axis.

[0049] While the intermediate ring 201 is in eccentric revolution motion, the second spherical roller on the back cover 401 engages with the first track groove 203 of the intermediate ring 201, so that the intermediate ring 201 generates rotation motion relative to the eccentric revolution axis. In the process of motion, the second spherical roller engages with the second track groove 302 of the output disc 301, and the rotation motion of the intermediate ring 201 around the eccentric revolution axis is transmitted to the output disc 301, so that the output disc 301 rotates around the concentric revolution axis and outputs rotation speed. Due to the engagement of the first spherical roller with the second track groove 302 of the output disc 301 and the engagement of the second spherical roller with the first track groove 203 of the intermediate ring 201, a certain speed difference is generated at two positions, i.e. the rotation speed of the output disc 301 and the rotation speed of the intermediate ring 201, and the rotation speed of the intermediate ring 201 and the rotation speed of the eccentric shaft. The output disc 301 reduces the output rotation speed and torque. The output disc 301 is detachably connected with the shell 501 and drives the shell 501 to rotate.

[0050] When the end face of the output disc 301 close to one end of the intermediate ring 201 is the second spherical hole 303, the back cover 401, the intermediate ring 201, the output disc 301, the first spherical roller and the second spherical roller constitute a one-stage speed reduction transmission structure. Due to the engagement of the second spherical roller with the first track groove 203 of the intermediate ring 201, a certain speed difference is generated at one position. Similarly, the output disc 301 reduces the output rotation speed and torque.

Claims

1. A transmission assembly, characterized in that: a shaft (101) is provided, an intermediate ring bearing inner ring matching surface (102) is formed on the outer periphery of the shaft (101), and the axis of the intermediate ring bearing inner ring matching surface (102) is spaced apart from the central rotation axis of the shaft (101); an intermediate ring (201) is rotatably connected to the shaft (101) through a first bearing, the inner ring of the first bearing is matched on the intermediate ring bearing inner ring matching surface (102), a plurality of first ball sockets (202) are uniformly distributed on the left end periphery of the intermediate ring (201), one first spherical roller is arranged in each first ball socket (202), and a first track groove (203) formed by a cycloid curve is uniformly distributed on the right end periphery of the intermediate ring (201); an output disc (301) is rotatably connected to the left part of the outer periphery of the shaft (101) through a second bearing, and the output disc (301) is in meshing transmission with the first spherical rollers; a rear cover (401) is rotatably connected to the shaft (101) through a third bearing, a plurality of third ball sockets (402) are uniformly distributed on the left side end surface in the rear cover (401), a second spherical roller is arranged in each third ball socket (402), the second spherical roller is meshed in the first track groove (203), and the number of the third ball sockets (402) is at least one more than the number of teeth of the first track groove (203).

2. The transmission assembly of claim 1, wherein, The shaft (101) is a hollow structure, and the inner ring is formed with a key groove.

3. The transmission assembly of claim 1, wherein, The right end of the output disc (301) is formed with a second track groove (302) formed by a cycloid curve, the first spherical rollers are meshed with the second track groove (302), and the number of the first ball sockets (202) is at least one more than the number of teeth of the second track groove (302); or, the right end surface of the output disc (301) is replaced with a second ball socket (303) uniformly distributed in a circle, the positions and numbers of the second ball sockets (303) correspond one by one to the positions and numbers of the first ball sockets (202), so that the same spherical roller exists in the first ball socket (202) and the second ball socket (303) corresponding in position.

4. The transmission assembly of claim 1, wherein, The intermediate ring (201) is a circular ring structure, the left part of the inner wall of the intermediate ring (201) is formed with an intermediate ring shoulder portion abutting against the left part of the outer ring of the first bearing, the right end of the shaft (101) at the intermediate ring bearing inner ring matching surface (102) is formed with a first shaft shoulder portion abutting against the right part of the inner ring of the first bearing; the right end of the output disc (301) is formed with an output disc recess, the right end of the output disc (301) is formed with an output disc sink groove located in the output disc recess, the output disc (301) is formed with an output disc (301) shoulder portion between the output disc sink groove and the output disc recess, the output disc (301) shoulder portion abuts against the left part of the outer ring of the second bearing, the left end of the shaft (101) at the intermediate ring bearing inner ring matching surface (102) is formed with a second shaft shoulder portion abutting against the right part of the inner ring of the second bearing; The rear cover (401) covers the upper intermediate ring (201), the outer peripheral end surface of the shaft (101) is formed with a third shaft shoulder part located at the right of the second shaft shoulder part, the third shaft shoulder part abuts against the left part of the inner ring of the third bearing, the inner end of the rear cover (401) has three circular grooves which are tapered from left to right, forming a stepped groove, the first rear cover shoulder part is formed in the circular groove at the right part and abuts against the right part of the outer ring of the third bearing.

5. A transmission assembly according to any one of claims 1 to 4, characterised in that, The shaft (101), the intermediate ring (201), the output disc (301) and the rear cover (401) are located in a virtual cylinder.

6. A wheel hub reduction gear characterized by The transmission assembly further comprises a housing (501) rotatably connected to the rear cover (401) through the fourth bearing, and the output disc (301) is detachably connected to the housing (501) through bolts.

7. The hub reduction of claim 6 wherein, The fourth bearing is provided in two numbers and arranged left and right, the output disc (301) abuts against the left end of the outer ring of the left fourth bearing, the outer peripheral end surface of the rear cover (401) is formed with a second rear cover shoulder part, the second rear cover shoulder part abuts against the end surfaces of the two fourth bearing inner rings facing each other, and the housing (501) abuts against the right end of the outer ring of the right fourth bearing.

8. The hub reduction of claim 6 wherein, Further comprising a motor base (601), the motor base (601) is detachably connected to the rear cover (401) through bolts.

9. The hub reduction of claim 6 wherein, The outer ring of the housing (501) is detachably connected or fixedly connected with a rubber sleeve (701).

10. The hub reduction of claim 6, wherein the rear cover A first sealing ring is installed between the rear cover (401), the housing (501) and the motor base (601), a second sealing ring is installed between the shaft (101), the rear cover (401) and the motor base (601), and the outer peripheral end surface of the output disc (301) is in close contact with the inner end surface of the housing (501) to form a seal.

Images