Reduction gearbox with 90-degree steering output

Abstract

The utility model relates to a 90-degree steering output reduction gearbox, which comprises an outer box, an input shaft assembly, a middle shaft assembly and an output shaft assembly are arranged in the outer box, the middle shaft assembly is meshed with the input shaft assembly, the output shaft assembly is meshed with the middle shaft assembly, and the input shaft assembly is parallel to the middle shaft assembly and is perpendicular to the output shaft assembly. The output shaft assembly comprises a bevel gear wheel meshed with the intermediate shaft assembly and an output shaft in bolted connection with the bevel gear wheel, the bevel gear wheel is arranged in the shell, the output shaft extends out of the shell to be arranged in a bearing seat, and an output end bearing assembly matched with the output shaft and an output end oil seal assembly for sealing the bearing seat and the output shaft respectively are arranged in the bearing seat. The front end and the rear end of the input shaft assembly extend out of the shell. The utility model reduces the maintenance cost, can be matched with the power input of a high-power tractor, improves the transmission efficiency, reduces the noise and vibration, has high sealing reliability, and can effectively reduce the oil leakage.

Description

Technical Field

[0001] The utility model relates to a reduction box with a 90-degree steering output, belonging to the technical field of power harrow reduction boxes. Background Art

[0002] Power-driven harrow is a tillage machine that is driven by a tractor to complete the soil-breaking and harrowing operation. Power-driven harrow has the advantages of strong soil adaptability and good soil-breaking effect, and is gradually accepted by users. The reliability and convenience of maintenance and adjustment of the drive harrow reducer directly affect the working performance of the whole machine; the drive harrow reducer outputs power at an angle of 90 degrees from the input shaft to the output shaft. Its main defects are:

[0003] 1. The bevel gear at the output shaft of the power harrow reduction box adopts a gear shaft integrated structure. The heat treatment process of the gear and shaft is different, which will increase the dimensional error of the bevel gear, resulting in large tooth side clearance after the bevel gear is engaged and inconvenient to adjust, low transmission efficiency, high noise, and the integrated processing of the gear shaft requires more raw materials. It needs to be replaced as a whole during maintenance, which is costly.

[0004] 2. With the continuous increase in tractor power in recent years, the drive harrow reduction box does not match the power input of high-power tractors.

[0005] 3. Most power harrow reducers use end cover seals, which require high accuracy in the oil seal position and are prone to oil leakage risks. If the sealing method is unreasonable, oil leakage is likely to occur.

[0006] 4. The bearings in the reduction gearbox are mainly limited by retaining rings. Excessive axial force will cause the retaining rings to fail, the bearing limit will be unreliable, the structural reliability will be poor, and noise and vibration will be generated. Utility Model Content

[0007] The reduction gearbox with 90-degree steering output provided by the utility model is easy to adjust and reduces maintenance costs, can match the power input of high-power tractors, improves transmission efficiency, each bearing is effectively positioned, reduces noise and vibration, has high sealing reliability, has low requirements on oil seal installation accuracy, and can effectively reduce oil leakage.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A reduction gearbox with a 90-degree output steering comprises an outer box, an input shaft assembly, an intermediate shaft assembly meshing with the input shaft assembly, and an output shaft assembly meshing with the intermediate shaft assembly installed in the outer box, wherein the input shaft assembly is parallel to the intermediate shaft assembly and perpendicular to the output shaft assembly, and is characterized in that: the outer box comprises a housing and a bearing seat fixedly connected to the lower end of the housing, the output shaft assembly comprises a large bevel gear meshing with the intermediate shaft assembly, an output shaft bolted to the large bevel gear, the large bevel gear is installed in the housing, the output shaft extends out of the housing and is installed in the bearing seat, the bearing seat is equipped with an output end bearing assembly matching with the output shaft and an output end oil seal assembly respectively sealing the bearing seat and the output shaft, and the front and rear ends of the input shaft assembly respectively extend out of the housing.

[0010] Preferably, the output end bearing assembly includes bearing 1 pressed into the bearing seat, bearing 2 pressed into the bearing seat and with the upper end abutting against the bearing seat, bearing 2 is located below bearing 1, bearing 1 and bearing 2 are respectively matched with the output shaft, the upper end of bearing 1 abuts against the output shaft, and the lower end abuts against the bearing seat, a locking nut is threadedly mounted on the output shaft, and the locking nut abuts against the lower end of bearing 2.

[0011] Preferably, the output end oil seal assembly includes a cover oil seal covering the upper end of the output shaft to seal the output shaft, an oil seal 1 clamped between the inner wall of the bearing seat and the locking nut to seal the lower end of the bearing seat, and an oil seal 2 clamped between the inner wall of the bearing seat and the output shaft, and the oil seal 2 is located between the first bearing and the second bearing.

[0012] Preferably, the input shaft assembly includes an input shaft with both ends extending out of the housing respectively and a small spur gear splinedly mounted at the rear end of the input shaft. Bearing three, bearing four and bearing five are press-fitted in the housing and respectively cooperate with the input shaft. Bearing three is located on the front side of bearing four, bearing four is located on the front side of the small spur gear, and bearing five is located on the rear side of the small spur gear.

[0013] Preferably, the rear end of the shell is open and covered with a cover plate, the input shaft is covered with an oil seal three that seals the front end of the shell and an oil seal four that seals the cover plate, the front end of the small spur gear abuts against the shoulder of the input shaft, and the rear end abuts against the retaining ring on the input shaft.

[0014] Preferably, the front end of the bearing three is against the housing, and the rear end is against the shoulder on the input shaft, the front end of the bearing four is against the shoulder on the input shaft, and the rear end is against the bearing cover fixed on the housing, the rear end of the bearing five is against the cover plate, and the front end is against the retaining ring on the cover plate.

[0015] Preferably, the intermediate shaft assembly includes an intermediate shaft parallel to the input shaft, a large spur gear spline-fitted at the rear end of the intermediate shaft and meshing with the small spur gear, and a small bevel gear spline-fitted on the intermediate shaft and meshing with the large bevel gear, the front end of the small bevel gear abuts against the shoulder of the intermediate shaft, the rear end abuts against the large spur gear, and the rear end of the large spur gear abuts against the retaining ring on the intermediate shaft.

[0016] Preferably, a bearing six is ​​pressed onto the housing and matches the front end of the intermediate shaft, and a bearing seven is pressed onto the small bevel gear. The front end of the bearing six abuts against the housing, and the rear end abuts against the shoulder of the intermediate shaft. The front end of the bearing seven abuts against the shoulder on the small bevel gear, and the rear end abuts against the bearing cover fixed on the housing.

[0017] The beneficial effects of the utility model are:

[0018] 1. The utility model has a 90-degree output reduction gearbox, in which the output shaft assembly is a split structure in which the large-diameter gear and the output shaft are connected by bolts. The large-diameter gear and the output shaft are processed and formed separately to ensure the key tooth accuracy of the large-diameter gear and reduce the tooth side clearance during meshing. The large-diameter gear and the output shaft can be replaced separately, which is convenient for adjustment and reduces maintenance costs. The front and rear ends of the input shaft assembly extend from the housing respectively, and one end or both ends can be selected as the power input end. When one end is selected as the power input end, the other end can transmit other equipment. When both ends are selected to act on the power input end at the same time, the input torque is shared, and the output power with high speed and high torque is formed by reducing the speed and increasing the torque through the reduction box, which matches the power input of the high-power tractor and improves the transmission efficiency.

[0019] 2. Each bearing that matches the input shaft, intermediate shaft and output shaft in the 90-degree output reduction box is effectively positioned, with high positioning reliability, large axial load, high structural stability, and reduced noise and vibration. The front end of the housing is sealed with an oil seal on the input shaft, and the front end of the housing adopts an integrated structure, which has high sealing reliability and low requirements for oil seal installation accuracy, which can effectively reduce oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a reduction gearbox with a 90-degree output in a specific implementation manner.

[0021] Figure 2 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0022] Combine the following Figure 1~2 The embodiments of the present utility model are described in detail.

[0023] A reduction box with a 90-degree output steering comprises an outer box, an input shaft assembly 1, an intermediate shaft assembly 2 meshing with the input shaft assembly 1, and an output shaft assembly 3 meshing with the intermediate shaft assembly 2, the input shaft assembly 1 is parallel to the intermediate shaft assembly 2, and perpendicular to the output shaft assembly 3, characterized in that: the outer box comprises a housing 4 and a bearing seat 5 fixedly connected to the lower end of the housing 4, the output shaft assembly 3 comprises a large bevel gear 31 meshing with the intermediate shaft assembly, an output shaft 32 bolted to the large bevel gear 31, the large bevel gear 31 is installed in the housing 4, the output shaft 32 extends out of the housing 4 and is installed in the bearing seat 5, the bearing seat 5 is equipped with an output end bearing assembly 6 matched with the output shaft and an output end oil seal assembly 7 respectively sealing the bearing seat 5 and the output shaft 32, and the front and rear ends of the input shaft assembly 1 respectively extend out of the housing 4.

[0024] In the above-mentioned reduction gearbox with 90-degree output, the large-diameter gear 31 and the output shaft 32 in the output shaft assembly 3 adopt a split structure connected by bolts. The large-diameter gear 31 and the output shaft 32 are processed and formed separately to ensure the key tooth accuracy of the large-diameter gear 31 and reduce the tooth side clearance during meshing. Moreover, the large-diameter gear and the output shaft can be replaced separately, which is convenient for adjustment and reduces maintenance costs. The front and rear ends of the input shaft assembly 1 extend from the housing 4 respectively, and one end or both ends can be selected as the power input end. When one end is selected as the power input end, the other end can transmit other equipment. When both ends are selected to act on the power input end at the same time, the input torque is shared, and the output power with high speed and high torque is formed by reducing the speed and increasing the torque through the reduction gearbox, which matches the power input of the high-power tractor and improves the transmission efficiency.

[0025] The output end bearing assembly 6 includes a bearing 1 61 pressed into the bearing seat, a bearing 2 62 pressed into the bearing seat 5 and with the upper end abutting against the bearing seat, the bearing 2 62 is located below the bearing 1 61, the bearing 1 61 and the bearing 2 62 are respectively matched with the output shaft 32, the upper end of the bearing 1 61 abuts against the output shaft 32, and the lower end abuts against the bearing seat 5, and a locking nut 33 is threadedly sleeved on the output shaft 32, and the locking nut 33 abuts against the lower end of the bearing 2 62. The bearing 1 61 and the bearing 2 32 radially support and position the output shaft, the bearing 1 61 is axially positioned by the output shaft 32 and the bearing seat 5, and the bearing 2 62 is axially positioned by the output shaft 32 and the locking nut 33, with high positioning reliability, large axial load, high structural stability, and reduced noise and vibration.

[0026] The output end oil seal assembly 7 includes a cover oil seal 71 covering the upper end of the output shaft 32 to seal the output shaft 32, an oil seal 1 72 sandwiched between the inner wall of the bearing seat 5 and the locking nut 33 to seal the lower end of the bearing seat 5, and an oil seal 2 73 sandwiched between the inner wall of the bearing seat 5 and the output shaft 32, and the oil seal 2 73 is located between the bearing 1 61 and the bearing 2 62. The cover oil seal 71 seals the inner hole at the upper end of the output shaft 32 to prevent the lubricating oil from leaking from the inner hole of the output shaft, and the oil seal 1 72 and the oil seal 2 73 form a double-layer seal between the bearing seat 5 and the output shaft 32 to prevent the lubricating oil from leaking from between the bearing seat 5 and the output shaft 32, thereby improving the sealing reliability of the lower end of the box.

[0027] The input shaft assembly 1 includes an input shaft 11 with two ends extending out of the housing 4 respectively and a small spur gear 12 mounted at the rear end of the input shaft 11 by spline fitting. The housing 4 is press-fitted with a bearing 3 13, a bearing 4 14 and a bearing 5 15 respectively fitting with the input shaft 11. The bearing 3 13 is located in front of the bearing 4 14, the bearing 4 14 is located in front of the small spur gear 12, and the bearing 5 15 is located at the rear of the small spur gear 12. Both ends of the input shaft 11 can be connected to the input power member, the small spur gear 12 rotates synchronously with the input shaft 11 and drives the intermediate shaft assembly 2 to rotate, forming a first-stage reduction. The bearing 3 13, the bearing 4 14 and the bearing 5 15 support and position the input shaft.

[0028] The rear end of the housing 4 is open and covered with a cover plate 8, the input shaft 11 is covered with an oil seal 3 16 that seals the front end of the housing 4 and an oil seal 4 17 that seals the cover plate 8, the front end of the small spur gear 12 abuts against the shoulder of the input shaft 11, and the rear end abuts against the snap ring on the input shaft 11. The front end of the housing is sealed by the oil seal 16 sleeved on the input shaft 11, and the front end of the housing 4 adopts an integrally formed structure, which has high sealing reliability, low requirements on the installation accuracy of the oil seal, and can effectively reduce oil leakage.

[0029] Among them, the front end of the bearing three 13 is against the housing 4, and the rear end is against the shoulder on the input shaft 11. The front end of the bearing four 14 is against the shoulder on the input shaft 11, and the rear end is against the bearing cover 9 fixed on the housing 4. The rear end of the bearing five 15 is against the cover plate 8, and the front end is against the retaining ring on the cover plate 8. The bearing three 13 is axially positioned by the housing 4 and the input shaft 11, and the bearing four 14 is axially positioned by the input shaft 11 and the bearing cover 9, thereby forming an axial positioning for the input shaft 11. The retaining ring on the input shaft 11 axially limits the small spur gear 12. The retaining ring is not subjected to force during normal operation. The bearing five 15 is axially positioned by the cover plate 8 and the retaining ring on the cover plate 8. The positioning reliability of the bearing three 13, the bearing four 14 and the bearing five 15 is high, the axial load is large, the structural stability is high, and the noise and vibration are reduced.

[0030] The intermediate shaft assembly 2 includes an intermediate shaft 21 parallel to the input shaft 11, a large spur gear 22 mounted at the rear end of the intermediate shaft 21 with a spline and meshing with the small spur gear 12, and a small bevel gear 23 mounted on the intermediate shaft 21 with a spline and meshing with the large bevel gear 31. The front end of the small bevel gear 23 abuts against the shaft shoulder of the intermediate shaft 21, and the rear end abuts against the large spur gear 22. The rear end of the large spur gear 22 abuts against the retaining ring on the intermediate shaft 21. The large spur gear 22 rotates with the small spur gear 12, driving the intermediate shaft 21 and the small bevel gear 32 to rotate. The small bevel gear 23 drives the large bevel gear 31 to rotate, forming a secondary reduction. The large bevel gear 31 drives the output shaft 32 to drive, realizing the 90-degree output of the power.

[0031] Among them, the housing 4 is press-fitted with a bearing 6 24 matched with the front end of the intermediate shaft 21, and the small bevel gear 23 is press-fitted with a bearing 7 25. The front end of the bearing 6 24 abuts against the housing 4, and the rear end abuts against the shaft shoulder of the intermediate shaft 21. The front end of the bearing 7 25 abuts against the shaft shoulder on the small bevel gear 23, and the rear end abuts against the bearing cover 9 fixed on the housing 4. The bearing 6 24 and the bearing 7 25 support and position the intermediate shaft 21. The bearing 6 24 is axially positioned by the intermediate shaft 21 and the housing 4, and the bearing 7 is axially positioned by the small bevel gear 23 and the bearing cover 9 on the housing 4, and the small bevel gear 23 is positioned on the intermediate shaft 21. The bearing 6 24 and the bearing 7 25 have high positioning reliability, large axial load, high structural stability, and reduced noise and vibration.

[0032] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. A reduction gearbox with a 90-degree output, comprising an outer box, an input shaft assembly mounted in the outer box, an intermediate shaft assembly meshing with the input shaft assembly, and an output shaft assembly meshing with the intermediate shaft assembly, wherein the input shaft assembly is parallel to the intermediate shaft assembly and perpendicular to the output shaft assembly, and is characterized in that: The outer box includes a shell and a bearing seat fixed to the lower end of the shell. The output shaft assembly includes a large bevel gear meshing with the intermediate shaft assembly and an output shaft bolted to the large bevel gear. The large bevel gear is installed in the shell, and the output shaft extends out of the shell and is installed in the bearing seat. The bearing seat is equipped with an output end bearing assembly that matches the output shaft and an output end oil seal assembly that seals the bearing seat and the output shaft respectively. The front and rear ends of the input shaft assembly extend out of the shell respectively.

2. The reduction gearbox with 90-degree output according to claim 1, characterized in that: The output end bearing assembly includes a bearing 1 pressed into the bearing seat, a bearing 2 pressed into the bearing seat and with the upper end abutting against the bearing seat, the bearing 2 is located below the bearing 1, the bearing 1 and the bearing 2 are respectively matched with the output shaft, the upper end of the bearing 1 abuts against the output shaft, and the lower end abuts against the bearing seat, a locking nut is threadedly mounted on the output shaft, and the locking nut abuts against the lower end of the bearing 2.

3. The reduction gearbox with 90-degree output according to claim 2, characterized in that: The output end oil seal assembly includes a cover oil seal covering the upper end of the output shaft to seal the output shaft, an oil seal 1 sandwiched between the inner wall of the bearing seat and the locking nut to seal the lower end of the bearing seat, and an oil seal 2 sandwiched between the inner wall of the bearing seat and the output shaft. The oil seal 2 is located between the first bearing and the second bearing.

4. The reduction gearbox with 90-degree output according to claim 1, characterized in that: The input shaft assembly includes an input shaft with both ends extending out of the housing respectively and a small spur gear installed at the rear end of the input shaft with a spline. Bearing three, bearing four and bearing five are press-fitted in the housing and respectively cooperate with the input shaft. Bearing three is located on the front side of bearing four, bearing four is located on the front side of the small spur gear, and bearing five is located on the rear side of the small spur gear.

5. The reduction gearbox with 90-degree output according to claim 4, characterized in that: The rear end of the housing is open and covered with a cover plate. The input shaft is covered with an oil seal three that seals the front end of the housing and an oil seal four that seals the cover plate. The front end of the small spur gear abuts against the shoulder of the input shaft, and the rear end abuts against the clamping ring on the input shaft.

6. The reduction gearbox with 90-degree output according to claim 5, characterized in that: The front end of the bearing three is against the housing, and the rear end is against the shoulder on the input shaft. The front end of the bearing four is against the shoulder on the input shaft, and the rear end is against the bearing cover fixed on the housing. The rear end of the bearing five is against the cover plate, and the front end is against the retaining ring on the cover plate.

7. The reduction gearbox with 90-degree output according to claim 4, characterized in that: The intermediate shaft assembly includes an intermediate shaft parallel to the input shaft, a large spur gear splined at the rear end of the intermediate shaft and meshing with a small spur gear, and a small bevel gear splined on the intermediate shaft and meshing with a large bevel gear. The front end of the small bevel gear abuts against the shoulder of the intermediate shaft, and the rear end abuts against the large spur gear. The rear end of the large spur gear abuts against a retaining ring on the intermediate shaft.

8. The reduction gearbox with 90-degree output according to claim 7, characterized in that: A bearing six is ​​pressed onto the housing and matches the front end of the intermediate shaft. A bearing seven is pressed onto the small bevel gear. The front end of the bearing six abuts against the housing, and the rear end abuts against the shaft shoulder of the intermediate shaft. The front end of the bearing seven abuts against the shaft shoulder on the small bevel gear, and the rear end abuts against the bearing cover fixed to the housing.

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