Low-noise hub reduction gearbox

Abstract

The utility model belongs to the technical field of transmission equipment, and relates to a low-noise hub reduction gearbox which comprises a shell, an input shaft connected with an external power source, an output shaft connected with an external work piece and a planet carrier fixed on an external machine base, a sun wheel is sleeved on the input shaft, and a plurality of planet wheels are rotatably arranged on the planet carrier. The sun gear and the planet gear are in meshing transmission, a gear ring meshed with the planet gear is arranged in the shell, the gear ring is in floating fit with the shell, the shell comprises a left shell body and a right shell body, the gear ring is connected with the right shell body through a spline, and the left shell body is fixedly connected with the right shell body through a fastener and forms a limiting structure for the gear ring. According to the low-noise hub reduction gearbox, the gear ring and the shell which are in floating fit are adopted, so that the planet gears are uniform in load, working noise is reduced, transmission efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission equipment and relates to a low-noise hub reduction box. Background Art

[0002] With the popularization of current energy-saving and emission-reduction policies, industry and automobiles are vigorously developing electric drive technology, and single-motor reduction gearbox is one of the important technical routes.

[0003] The existing single-motor reducer mostly adopts planetary gear set transmission. The main problem is that the load distribution on each planetary gear in the planetary gear reducer is uneven, which is easy to produce large vibration impact and noise in serious cases, and even cause gear teeth to break, thus shortening the service life of the reducer. In view of this, it is necessary to develop a new planetary gear reducer that can make the planetary gears evenly loaded, reduce working noise, and improve transmission efficiency and life. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a low-noise hub reduction box, which adopts a floating matching gear ring and a housing to evenly load the planetary wheels, thereby reducing working noise and improving transmission efficiency and service life.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A low-noise hub reduction box comprises a housing, an input shaft connected to an external power source, an output shaft connected to an external working piece and a planetary carrier fixed to an external machine base, wherein a sun gear is mounted on the input shaft, a plurality of planetary gears are rotatably arranged on the planetary carrier, the sun gear meshes with the planetary gears for transmission, a gear ring meshing with the planetary gears is arranged in the housing, the gear ring is floatingly matched with the housing, the housing comprises a left housing and a right housing, the gear ring is connected to the right housing via a spline, the left housing is fixedly connected to the right housing via a fastener and forms a limiting structure for the gear ring.

[0007] In the above-mentioned low-noise hub reducer, a convex ring is arranged on the right end face of the left shell, the outer wall of the convex ring is in contact with the inner wall of the right shell, and a matching limiting step is arranged between the inner side of the convex ring and the gear ring, and the limiting step forms an axial and radial limiting structure of the gear ring.

[0008] In the above-mentioned low-noise hub reduction gearbox, a cylindrical roller bearing is arranged between the left end of the input shaft and the planetary carrier, and its inner ring is interference fit with the input shaft, and the outer ring is pressed by a first pressure plate; a double-row tapered roller bearing is arranged between the right end of the input shaft and the planetary carrier, and its inner ring is locked by a nut, and the outer ring is pressed by a second pressure plate; the first pressure plate and the second pressure plate are fixed to the planetary carrier by fasteners, and the nut is threaded on the end of the input shaft.

[0009] In the above-mentioned low-noise hub reduction box, a first tapered roller bearing is arranged between the planetary carrier and the left housing, and a second tapered roller bearing is arranged between the planetary carrier and the right housing; an adjustment gasket is arranged between the left side surface of the outer ring of the first tapered roller bearing and the left housing; the preload of the bearing can be adjusted by selecting different adjustment gaskets.

[0010] In the above-mentioned low-noise hub reducer, the planetary wheel is assembled on the planetary shaft through a needle roller and a retaining frame assembly, a planetary gasket is arranged between the planetary wheel and the planetary shaft, and the two ends of the planetary shaft are axially limited by the shoulders of the planetary frame and the outer ring of the second tapered roller bearing respectively. A pair of planetary gaskets are arranged, which are respectively located on both sides of the planetary wheel.

[0011] In the above-mentioned low-noise hub reduction box, a right side end surface of the right housing is evenly provided with a plurality of threaded holes along the circumferential direction, and the output shaft is fastened to the right housing by a plurality of bolts.

[0012] In the above-mentioned low-noise hub reducer, the output shaft is a hollow structure, an oil filling plug connected to the inner cavity of the reducer is coaxially arranged on the right shell, and an oil drain plug connected to the inner cavity of the reducer is arranged on the left shell; the oil circuit breathable structure is arranged on the planetary carrier.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model provides a wheel hub reduction box, which adopts a left-right split housing structure, connects the ring gear to the right housing through a spline, and uses the left housing to limit the position, so that the ring gear and the housing form a floating matching structure. During the transmission process, the ring gear can float slightly in the radial position to balance the load on each planetary gear, thereby ensuring that the entire system has a good load-balancing effect, thereby reducing working noise and improving transmission efficiency and life.

[0015] 2. The utility model further improves the assembly structure of each transmission part. By assembling the input shaft with cylindrical roller bearings and double-row tapered roller bearings, there is no need to adjust the clearance, the assembly consistency is high, and the reliability of the input transmission structure can be improved; by setting the adjustment gasket, the preload of the bearing can be adjusted to improve the reliability of the output transmission structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axial cross-sectional view of the utility model;

[0017] Figure 2 It is a left view of the utility model;

[0018] Figure numerals: 1. input shaft; 2. output shaft; 3. planet carrier; 4. sun gear; 5. planet gear; 6. ring gear; 7. left housing; 8. right housing; 9. convex ring; 10. limit step; 11. cylindrical roller bearing; 12. first pressure plate; 13. double-row tapered roller bearing; 14. nut; 15. second pressure plate; 16. first tapered roller bearing; 17. second tapered roller bearing; 18. adjusting gasket; 19. needle roller and retainer assembly; 20. planet shaft; 21. planetary gasket; 22. oil filling plug; 23. oil drain plug. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings. Figure 1-2 :

[0020] A low-noise hub reduction box comprises a housing, an input shaft 1 connected to an external power source, an output shaft 2 connected to an external working piece and a planetary carrier 3 fixed to an external machine base, wherein the input shaft 1 is provided with a sun gear 4, a plurality of planetary gears 5 are rotatably arranged on the planetary carrier 3, the sun gear 4 is meshed with the planetary gears 5 for transmission, a gear ring 6 meshed with the planetary gears 5 is arranged in the housing, the gear ring 6 is in floating cooperation with the housing, the housing comprises a left housing 7 and a right housing 8, the gear ring 6 is connected to the right housing 8 via a spline, the left housing 7 is fixedly connected to the right housing 8 via fasteners and forms a limiting structure for the gear ring 6.

[0021] The transmission process of this embodiment is: power is input through an external power source (external motor), driving the input shaft 1 to rotate, and is transmitted to the planetary gear 5 through the sun gear 4. The planetary gear 5 drives the gear ring 6 meshing therewith to rotate, and the gear ring 6 transmits power to the right housing 8 through the spline, and the right housing 8 outputs power to the external working part through the output shaft 2, driving it to rotate. The use of the floating gear ring 6 in this embodiment can reduce the uneven load meshing of the planetary gear 5, reduce the noise by at least 10dB, and improve the transmission efficiency and life.

[0022] The assembly structure of the housing and the gear ring 6 of this embodiment further includes: a convex ring 9 is arranged on the right end surface of the left housing 7, the outer side wall of the convex ring 9 is in contact with the inner side wall of the right housing 8, and a matching limiting step 10 is arranged between the inner side of the convex ring 9 and the gear ring 6, and the limiting step 10 forms an axial and radial limiting structure of the gear ring 6. The convex ring 9 structure can not only realize the centering match between the left housing 7 and the right housing 8, but also limit the gear ring 6 to its transmission position where it allows floating; if necessary, the surface to be sealed can be further sealed by a sealant.

[0023] The assembly structure of the input shaft 1 of this embodiment is as follows: a cylindrical roller bearing 11 is arranged between the left end of the input shaft 1 and the planet carrier 3, the inner ring of which is interference fit with the input shaft 1, and the outer ring is pressed by the first pressure plate 12; a double-row tapered roller bearing 13 is arranged between the right end of the input shaft 1 and the planet carrier 3, the inner ring of which is locked by a nut 14, and the outer ring is pressed by a second pressure plate 15; the first pressure plate 12 and the second pressure plate 15 are fixed to the planet carrier 3 by fasteners, and the nut 14 is screwed on the end of the input shaft 1; in this embodiment, the two ends of the input shaft 1 are supported by the cylindrical roller bearing 11 and the double-row tapered roller bearing 13 respectively, and the nuts 14, the first pressure plate 12 and the second pressure plate 15 are used for locking at the same time, so that a stable rotating structure can be formed without adjusting the gap.

[0024] The assembly structure of the planet carrier 3 in this embodiment is as follows: a first tapered roller bearing 16 is arranged between the planet carrier 3 and the left housing 7, and a second tapered roller bearing 17 is arranged between the planet carrier 3 and the right housing 8; an adjustment gasket 18 is arranged between the left side surface of the outer ring of the first tapered roller bearing 16 and the left housing 7; and the preload amount of the bearing can be adjusted by selecting different adjustment gaskets 18.

[0025] The assembly structure of the planetary gear 5 of this embodiment is: the planetary gear 5 is assembled on the planetary shaft 20 through a needle roller and retaining frame assembly 19, a planetary gasket 21 is arranged between the planetary gear 5 and the planetary shaft 20, and the two ends of the planetary shaft 20 are axially limited by the shoulder of the planetary carrier 3 and the outer ring of the second tapered roller bearing 17 respectively, so as to axially constrain it in the planetary carrier 3, and a pair of planetary gaskets 21 are arranged, which are respectively located on both sides of the planetary gear 5. During assembly, the planetary gaskets 21 and the planetary gear 5 are sequentially mounted on the planetary shaft 20.

[0026] The right end surface of the right housing 8 is evenly provided with a plurality of threaded holes along the circumferential direction, and the output shaft 2 is fastened to the right housing 8 by a plurality of bolts.

[0027] The lubrication system of this embodiment is as follows: the output shaft 2 is a hollow structure, an oil filling plug 22 connected to the inner cavity of the reduction box is coaxially arranged on the right housing 8, the output shaft 2 with a hollow structure can leave space for the setting of the oil filling plug 22, the left housing 7 is provided with an oil drain plug 23 connected to the inner cavity of the reduction box, the planetary shaft 20 is a hollow structure and is provided with radial oil holes for better lubrication of the needle roller and retainer assembly 19; an oil circuit breathable structure is arranged on the planetary carrier 3, and in this embodiment, the oil circuit breathable structure is a breathable plug; through the above arrangement, the oil circuit height can be increased to solve the oil leakage problem of the planetary reducer.

[0028] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-noise hub reduction gearbox, comprising a housing, an input shaft (1) connected to an external power source, an output shaft (2) connected to an external working piece, and a planet carrier (3) fixed to an external machine base, wherein a sun gear (4) is mounted on the input shaft (1), and a plurality of planet gears (5) are rotatably arranged on the planet carrier (3), wherein the sun gear (4) is meshed with the planet gears (5) for transmission, and wherein: A ring gear (6) meshing with the planetary gear (5) is arranged in the housing, the ring gear (6) is in floating cooperation with the housing, the housing comprises a left housing (7) and a right housing (8), the ring gear (6) is connected to the right housing (8) via a spline, the left housing (7) is fixedly connected to the right housing (8) via a fastener and forms a limiting structure for the ring gear (6).

2. A low noise hub reduction box according to claim 1, characterized in that: A convex ring (9) is arranged on the right end surface of the left housing (7), the outer wall of the convex ring (9) is in contact with the inner wall of the right housing (8), and a matching limiting step (10) is arranged between the inner side of the convex ring (9) and the gear ring (6), and the limiting step (10) forms an axial and radial limiting structure for the gear ring (6).

3. A low noise hub reduction box according to claim 1, characterized in that: A cylindrical roller bearing (11) is arranged between the left end of the input shaft (1) and the planet carrier (3), the inner ring of which is interference fit with the input shaft (1) and the outer ring is pressed by a first pressure plate (12); a double-row tapered roller bearing (13) is arranged between the right end of the input shaft (1) and the planet carrier (3), the inner ring of which is locked by a nut (14) and the outer ring is pressed by a second pressure plate (15).

4. A low noise hub reduction box according to claim 1, characterized in that: A first tapered roller bearing (16) is arranged between the planet carrier (3) and the left housing (7), and a second tapered roller bearing (17) is arranged between the planet carrier (3) and the right housing (8); an adjustment gasket (18) is arranged between the left side surface of the outer ring of the first tapered roller bearing (16) and the left housing (7).

5. A low noise hub reduction box according to claim 4, characterized in that: The planetary wheel (5) is assembled on the planetary shaft (20) through a needle roller and a cage assembly (19), a planetary gasket (21) is provided between the planetary wheel (5) and the planetary shaft (20), and the two ends of the planetary shaft (20) are axially limited by the shoulders of the planetary carrier (3) and the outer ring of the second tapered roller bearing (17), respectively.

6. A low noise hub reduction box according to claim 1, characterized in that: The right end surface of the right housing (8) is evenly provided with a plurality of threaded holes along the circumferential direction, and the output shaft (2) is fastened to the right housing (8) by a plurality of bolts.

7. The low noise hub reduction box according to claim 1, characterized in that: The output shaft (2) is a hollow structure, an oil filling plug (22) communicating with the inner cavity of the reduction box is coaxially arranged on the right housing (8), and an oil drain plug (23) communicating with the inner cavity of the reduction box is arranged on the left housing (7); and an oil passage ventilation structure is arranged on the planet carrier (3).

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