JPH0667147U - Final reducer for construction machinery - Google Patents

Abstract

(57) [Summary] [Object] To provide a final reduction gear having a brake that facilitates the formation of multiple discs. In a final reduction gear of a construction machine, in which a brake 3 and a planetary gear mechanism 4 are provided between an output shaft 2 of a differential gear 1 and a final reduction gear shaft 7, a housing 5 housing the brake 3 and the planetary gear mechanism 4 The spline 5a is formed on the peripheral surface, the plate 3b of the brake 3 is engaged with the spline 5a, and the ring gear 4f of the planetary gear mechanism 4 is fixed to the housing 6 by the pin 4e. 3a and the disc 3b can be easily assembled, and at the same time, the plate 3a and the disc 3b can be easily made into multiple plates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a final reduction gear used for a power system of a construction machine.

[0002]

[Prior art]

 Conventionally, wheeled construction machines such as wheel loaders are equipped with a final reduction gear at the final stage of the power system that transmits the power of the engine to the drive wheels. As shown in FIG. 1, the conventional final reduction gear is composed of a planetary gear mechanism a. A brake c is provided between the planetary gear mechanism a and a differential gear b. e and the ring gear f of the planetary gear mechanism a are fixed to the housing h side by a pin g 1. As another final speed reducer, as shown in FIG. 2, a plate d of the brake c is fixed to the housing k side by a claw i, and a ring gear f is fixed to the housing h side by a pin g. .

[0003]

[Problems to be solved by the device]

 However, in the case where the plate d of the brake c is fixed to the housing h side by the pin g, it takes a lot of labor to assemble, and when the disc j is a multi-plate, it is provided between the piston e and the plate d. There is a problem that the return spring of the piston e for cutting the disc j cannot be mounted on the outer peripheral portion of the disc j.

In the case where the plate d is fixed by the claw body i, if the plate d is excessively worn, the claw body i cannot be fixed and the braking function is impaired, and only one disc j can be used. There was a problem that the braking performance could not be increased by using multiple discs j. The present invention has been made in order to improve such a conventional problem, and an object thereof is to provide a final reduction gear for a construction machine in which the number of disks can be increased.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention accommodates a brake and a planetary gear mechanism in a final reduction gear for a construction machine in which a brake and a planetary gear mechanism are provided between an output shaft of a differential gear and a final reduction shaft. A spline is formed on the inner peripheral surface of the housing, the plate of the brake is engaged with the spline, and the ring gear of the planetary gear mechanism is fixed to the housing by a pin.

[0006]

[Action]

 With the above structure, the brake plate and the disc can be easily assembled in a short time, and the disc can be easily made into multiple plates.

[0007]

【Example】

 An embodiment of this invention will be described in detail with reference to FIG. FIG. 3 shows a cross-sectional view of the final reduction gear, in which 1 denotes a differential gear.

A spline 2a and a sun gear 4a are formed on the output shaft 2 of the differential gear 1, and the disc 3a of the brake 3 is engaged with the spline 2a. The brake 3 is provided with a plurality of discs 3a and plates 3b alternately, and the outer periphery of each plate 3b is engaged with a spline 5a formed in the housing 5 and is provided in the housing 1a. The output shaft 2 of the differential gear 1 can be braked by pressing each disk 3a and the plate 3b into pressure contact with each other by the piston 3c.

A plurality of planetary gears 4b are meshed with the sun gear 4a of the planetary gear mechanism 4. These planetary gears 4b are rotatably supported by a carrier 4c fixed to the final reduction shaft 7 via pins 4d, and each planetary gear 4b is attached to a ring gear 4f fixed to the inner peripheral surface of the housing 6 by pins 4e. Each is meshed.

On the other hand, the housing 5 in which the plate 3b of the brake 3 is spline-engaged and the housing 6 in which the ring gear 4f is pin-connected are integrated by the mount bolt 8 on the mounting surface 5b, and the housing 1a of the differential 1 is assembled. Installed on.

To explain the operation, the power output to the output shaft 2 of the differential gear 1 is transmitted from the sun gear 4a of the planetary gear mechanism 4 to the carrier 4c via the planetary gear 4b and output to the final reduction shaft 7. Works as it is. Here, since the housing 5 is separated from the housing 6 and the housing 1a, the spline 5a of the housing 5 can be easily processed, and the ring gear 4f and the pin 4e can be easily incorporated into the housing 6. Further, since the plate 3b is engaged with the spline 5a on the inner peripheral surface of the housing 5, the final speed reducer can be easily assembled and the discs 5b can be easily made into multiple plates.

In the above embodiment, the ring gear 4f is fixed to the housing 6 by the pin 4e. However, as shown in FIG. 4, a spline 5c is formed on the inner peripheral surface of the housing 6, and the ring gear 4f is attached to the spline 5c. You may make it engage. In this case, since it is possible to change the number of teeth, the module, the pressure angle and the like of the spline 5a engaged with the plate 3b and the spline 5c engaged with the ring gear 4f, it is possible to change the number of teeth, the module, the pressure angle, etc. It is easy to change the spline size. Further, since the rotational reaction force of the ring gear 4f is received by the housing 6 mounted on the vehicle body side, the number of mount bolts 8 for fixing the housing 5 and the differential gear 1 can be reduced.

[0013]

[Effect of device]

 As described in detail above, in this invention, since the brake plate is engaged with the spline provided in the housing, it is easy to assemble the brake disc and plate when assembling the final reduction gear, and the assembling work is performed. Can be done efficiently in a short time. Further, since it is possible to easily increase the number of discs, it is possible to increase the braking ability and the durability.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional final reduction gear transmission.

FIG. 2 is an explanatory diagram of another conventional final reduction gear transmission.

FIG. 3 is a sectional view of a final reduction gear system according to an embodiment of the present invention.

FIG. 4 is a sectional view of a final speed reducer according to another embodiment of the present invention.

[Explanation of symbols]

 1 differential 2 output shaft 3 brake 3a disc 3b plate 3c piston 4 planetary gear mechanism 4e pin 4f ring gear 5 housing 5a spline 5c spline 6 housing 7 final reduction shaft

Claims (2)

[Scope of utility model registration request] 1. A final speed reducer for a construction machine, wherein a brake 3 and a planetary gear mechanism 4 are provided between an output shaft 2 of a differential gear 1 and a final speed reducer shaft 7, and the inner peripheral surface of a housing 5 housing the brake 3 therein. The spline 5a is formed, and this spline 5
While engaging the plate 3b of the brake 3 with a,
A final reduction gear for a construction machine in which a ring gear 4f of the planetary gear mechanism 4 is fixed to a housing 6 by a pin 4e. 2. The final reduction gear transmission according to claim 1, wherein the ring gear 4f of the planetary gear mechanism 4 is also engaged with a spline 5c formed on the inner peripheral surface of the housing 6.