Locking structure for planet carrier and axle of forklift reduction gearbox

Abstract

The utility model provides a locking structure for a planet carrier and a wheel shaft of a forklift reduction gearbox. The locking structure comprises the planet carrier, the wheel shaft and a shell. Three through holes are formed in the flange surface of the planet carrier; three threaded holes are formed in the end face of one end of the axle, an inner spline is arranged on an inner hole, the inner hole is not completely drilled through, an inner hole is formed in a flange part of the axle and used for installing an oil seal, and two bearing necks are further arranged on the axle. The shell is provided with two bearing holes and an oil seal journal; an outer hub bearing and an inner hub bearing are respectively arranged in the two bearing holes; the oil seal is fixed in the oil seal shaft neck; bolts penetrate through the three through holes in the planet carrier, and torque is applied to screw the bolts into the three threaded holes in the wheel shaft, so that the planet carrier and the wheel shaft are axially fixed, and the outer hub bearing and the inner hub bearing are pre-tightened. Axial fixation of the planet carrier and the axle and pre-tightening of the hub bearing are achieved through the bolt set, assembly difficulty caused by too large tightening torque is avoided, and assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reduction gearboxes, in particular to a locking structure of a planetary frame and a wheel axle of a forklift reduction gearbox. Background Art

[0002] Existing dual-motor driven electric counterbalanced forklifts often use distributed drive, that is, a reduction box and a drive motor are configured at the left and right front wheels. The transmission form of the reduction box is usually two-stage reduction, the first stage uses a pair of cylindrical gears, and the second stage uses planetary gears. The planetary carrier of the planetary gear set is used as the output component. The planetary carrier is designed with an external spline and external thread. The wheel shaft is a hollow shaft with an internal spline on the inner hole. The planetary carrier and the wheel shaft are connected and matched through splines. An O-ring is installed between the planetary carrier and the wheel shaft to ensure the sealing of the wheel shaft end. Finally, the two are locked by a slotted nut, which plays the role of pre-tightening the hub bearing on the wheel shaft.

[0003] In this structure, because the output end bearing is usually subjected to a large load and involves safety, the diameter of the slotted nut is generally designed to be large, requiring a large assembly torque to lock, which is not easy to achieve in assembly and is generally completed with the help of special tooling, extended torque wrenches or mechanical equipment. In addition, because the axle is a hollow shaft, the design requires an O-ring to seal the gear oil in the reduction box, which increases the cost of parts and the possibility of oil leakage; a protective cover is usually installed on the axle to cover the slotted nut and planetary carrier extending from the inner hole of the axle, which further increases the cost of parts and assembly. Utility Model Content

[0004] In view of the problems in the prior art, the present invention provides a locking structure for the planetary carrier and the wheel axle of a forklift reduction box. The design uses a bolt group to achieve the fastening between the wheel axle and the planetary carrier and the locking of the wheel hub bearing, which is easy to assemble and saves assembly costs. At the same time, the wheel axle adopts an incompletely hollow design, and the O-ring and protective cover are eliminated, avoiding the risk of gear oil leakage from the splines inside the wheel axle and the problem of one end of the planetary carrier being exposed to the outside of the box, thereby saving parts and assembly costs.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A locking structure for a planetary carrier and axle of a forklift reduction box, comprising a planetary carrier, axle and a housing; three through holes are arranged on the flange surface of the planetary carrier, and an external spline is arranged on the output shaft of the planetary carrier; three threaded holes are arranged on the end surface of one end of the axle, an internal spline is arranged on the inner hole, and the inner hole is not completely drilled through, an inner hole is arranged on the flange part of the axle for installing an oil seal, and two bearing journals are also arranged on the shaft; two bearing holes and an oil seal journal are arranged on the housing; an outer hub bearing and an inner hub bearing are respectively installed in the two bearing holes; the oil seal is fixed in the oil seal journal; bolts are passed through the three through holes on the planetary carrier, and torque is applied to screw the bolts into the three threaded holes on the axle to complete the axial fixation of the planetary carrier and the axle and the pre-tightening of the outer hub bearing and the inner hub bearing.

[0007] Compared with the prior art, the beneficial effects of the utility model are: 1. The utility model designs a planetary carrier and wheel axle locking structure for a forklift reduction box, and realizes axial fixation of the planetary carrier and the wheel axle and pre-tightening of the hub bearing by using a bolt group, thereby avoiding assembly difficulties caused by excessive tightening torque, reducing assembly investment, and improving assembly efficiency.

[0008] 2. The inner hole of the wheel axle is designed to be non-drilled, which reduces the leakage points and the number of parts of the reduction gearbox, improves the reliability of the product, and reduces the material and assembly costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The utility model is further described below in conjunction with the accompanying drawings.

[0010] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0011] Figure 2 It is an axonometric cross-sectional view of the utility model.

[0012] Markings in the figure: 1-planet carrier; 2-axle; 3-bolt; 4-outer hub bearing; 5-inner hub bearing; 6-oil seal; 7-housing. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] Example 1

[0015] like Figure 1-2As shown, this embodiment provides a locking structure of a planet carrier and a wheel axle of a forklift reduction box, including a planet carrier 1, a wheel axle 2 and a housing 7.

[0016] The flange surface of the planet carrier 1 is provided with three through holes, and the output shaft of the planet carrier 1 is provided with external splines.

[0017] Three threaded holes are provided on the end face of one end of the axle 2, an internal spline is provided on the inner hole, and the inner hole is not completely drilled through, an inner hole is provided on the flange part of the axle 2 for installing the oil seal 6, and two bearing necks are also provided on the shaft; two bearing holes and an oil seal journal are provided on the housing 7; the outer hub bearing 4 and the inner hub bearing 5 are respectively installed in the two bearing holes; the oil seal 6 is fixed in the oil seal journal; the bolts 3 are passed through the three through holes on the planet carrier 1, and torque is applied to screw the bolts into the three threaded holes on the axle 2 to complete the axial fixation of the planet carrier 1 and the axle 2 and the pre-tightening of the outer hub bearing 4 and the inner hub bearing 5.

[0018] The bearing hole on the housing 7 is matched with the outer rings of the outer hub bearing 4 and the inner hub bearing 5 , and the oil seal journal is matched with the oil seal 6 .

[0019] First, assemble the axle 2, oil seal 6, outer hub bearing 4, inner hub bearing 5 and housing 7, then install the planet carrier 1 on the axle 2 through spline fitting, pass the bolts 3 through the through holes on the planet carrier 1, apply torque to screw the bolts 3 into the internal threads of the axle 2, thereby achieving axial fixation of the planet carrier 1 and the axle 2 and pre-tightening of the outer hub bearing 4 and the inner hub bearing 5, while ensuring the sealing of the axle end.

[0020] By using a bolt group to achieve axial fixation of the planet carrier and the wheel axle and pre-tightening of the hub bearing, assembly difficulties caused by excessive tightening torque are avoided, assembly investment is reduced, and assembly efficiency is improved.

[0021] The inner hole of the wheel axle is designed to be non-drilled, which reduces the leakage points and the number of parts of the reduction gearbox, improves the reliability of the product, and reduces the material and assembly costs.

[0022] The above contents are merely examples of the structure of the present utility model. The technical personnel in the relevant technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A locking structure for a planetary carrier and a wheel axle of a forklift reduction gearbox, comprising a planetary carrier (1), a wheel axle (2) and a housing (7); characterized in that: The flange surface of the planetary carrier (1) is provided with three through holes, and the output shaft of the planetary carrier (1) is provided with an external spline; the end surface of one end of the wheel shaft (2) is provided with three threaded holes, the inner hole is provided with an internal spline, and the inner hole is not completely drilled through; the flange part of the wheel shaft (2) is provided with an inner hole for installing an oil seal (6), and the shaft is also provided with two bearing journals; the housing (7) is provided with two bearing holes and an oil seal journal; the outer hub bearing (4) and the inner hub bearing (5) are respectively installed in the two bearing holes; the oil seal (6) is fixed in the oil seal journal; bolts (3) are passed through the three through holes on the planetary carrier (1), and torque is applied to screw the bolts into the three threaded holes on the wheel shaft (2) to complete the axial fixation of the planetary carrier (1) and the wheel shaft (2) and the pre-tightening of the outer hub bearing (4) and the inner hub bearing (5).

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