JP2022020961A - Hydraulic motor with turning reduction gear - Google Patents

Abstract

To suppress the size enlargement of a carrier on which a plate is installed by supporting the plate within an inside diameter, and to make a structure compact in a size.SOLUTION: A hydraulic motor 10 with a turning reduction gear has a lower reduction mechanism 11 and an upper reduction mechanism 12. A sun gear 14 of the reduction mechanism 12 is spline-connected to a motor shaft 15, and arranged coaxially therewith. A protrusion 16 is formed at a tip of the motor shaft 15, and a tip of the protrusion 16 is inserted into an inner hole 13a of the sun gear 13 of the reduction mechanism 11 at an upper face. A carrier 17 is engaged with a gear which is formed at an output shaft 18, a protrusion 19 is formed at a tip of the output shaft 18, and a tip of the protrusion 19 is inserted into the inner hole 13a of the sun gear 13 at a lower face. A plate 20 which is fit and inserted into an outside diameter of the protrusion 16 of the motor shaft 15 is attached between the upper face of the sun gear 13 and a lower face of the sun gear 14. A plate 21 which is fit and inserted into an outside diameter of the protrusion 19 of the output shaft 18 is attached between the lower face of the sun gear 13 and an upper face of the output shaft 18.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hydraulic motor with a speed reducer for turning, which is used when turning a hydraulic excavator, a crane, or the like.

Conventionally, the deceleration mechanism of this type of hydraulic motor with a swivel speed reducer includes, for example, a lower planetary gear deceleration mechanism 24 provided in the housing 16 as shown in FIGS. 2 and 3 of Patent Document 1, and an upper planet. It has a gear reduction mechanism 25, and the sun gears 24A and 26 of these planetary gear reduction mechanisms 24 and 25 are located coaxially with the upper surface of the sun gear 24A so that these sun gears 24A and 26 do not come into direct contact with each other. A plate 35 is provided between the lower surface of the sun gear 26, and the plate 35 is mounted in a recess (not shown) formed in the carrier 28, and the outer diameter of the plate 35 and the recess up and down the plate 35. And movement in the left-right direction is restricted.

Similarly, a plate similar to the plate 35 is provided between the lower surface of the sun gear 24A and the upper surface of the carrier 24C, and the plate is mounted on the recess formed in the carrier 24C to regulate the movement in the vertical and horizontal directions. (See, for example, Patent Document 1).

JP-A-2015-113851

In Patent Document 1, when a mechanism is provided on a carrier to regulate the movement of the plate, the structure is supported by the outer diameter of the carrier, so that the carrier itself becomes large depending on the size of the plate, which is a factor that increases the cost of the product. Become.

The present invention has been made to solve the above problems, and by supporting the inner diameter of the plate, it is possible to suppress an increase in the size of the carrier on which the plate is installed, to make the structure compact, and to reduce the cost. It is an object of the present invention to provide a hydraulic motor with a speed reducer for turning.

The invention for solving the above-mentioned problems is
With a motor shaft rotatably supported by the housing,
The upper planetary gear deceleration mechanism that decelerates the rotation of the motor shaft,
A lower planetary gear reduction mechanism provided facing the upper planetary gear reduction mechanism to reduce the rotation of the motor shaft, and a lower planetary gear reduction mechanism.
An output shaft for outputting the rotation decelerated by the lower planetary gear reduction mechanism, and
Equipped with
The upper planetary gear reduction mechanism includes an upper sun gear spline-coupled to the motor shaft, a plurality of upper planetary gears that mesh with the upper sun gear and the internal gear, and revolve around the upper sun gear while rotating around the upper sun gear. With an upper carrier, which rotatably supports multiple upper planetary gears,
The lower planetary gear reduction mechanism makes it possible to rotate the lower sun gear spline-coupled to the upper carrier, a plurality of lower planetary gears that revolve while rotating around the lower sun gear, and the plurality of lower planetary gears. With a lower carrier to support,
A first plate is provided between the lower surface of the upper sun gear and the upper surface of the lower sun gear.
A second plate is provided between the upper surface of the output shaft and the lower surface of the lower sun gear.
The first plate is fitted into the outer diameter of the convex portion of the motor shaft, and the second plate is fitted into the outer diameter of the convex portion of the output shaft. Is.

In the present invention, by inserting the convex portions of the motor shaft and the output shaft into the inner diameter portion of the plate, the movement of the plate in the vertical and horizontal directions can be suppressed. Therefore, the size of the plate can be suppressed, the structure can be made compact, and the cost can be suppressed.

It is a substantially vertical cross section of a main part of the hydraulic motor with a swivel speed reducer according to the embodiment of the present invention.

Hereinafter, the hydraulic motor with a swivel speed reducer according to the present invention will be described in detail with reference to the accompanying drawings with reference to suitable embodiments.

FIG. 1 shows a schematic vertical sectional view of a main part of a hydraulic motor 10 with a swivel speed reducer according to an embodiment of the present invention. The hydraulic motor 10 with a swivel speed reducer has a lower planetary gear speed reduction mechanism 11 (hereinafter referred to as a speed reduction mechanism 11) housed in a housing 25 and an upper stage planetary gear speed reduction mechanism 12 (hereinafter referred to as a speed reduction mechanism 12).

The deceleration mechanism 11 decelerates the rotation of the deceleration mechanism 12 and transmits it to the output shaft 18. The deceleration mechanism 11 includes a lower sun gear 13 spline-coupled to the upper carrier 24 of the deceleration mechanism 12 and the lower stage. It is composed of a plurality of lower planetary gears 23 that revolve while rotating around the sun gear 13 and a lower carrier 17 that rotatably supports the lower planetary gears 23. The lower carrier 17 of the speed reduction mechanism 11 is spline-coupled by a male spline portion (not shown) provided on the upper end side of the output shaft 18. Further, in order to restrict the lower sun gear 13 from moving downward, a plate 21 is installed between the lower surface of the lower sun gear 13 and the upper surface of the output shaft 18. The plate 21 is fitted into the outer diameter of the convex portion 19 provided on the upper side of the output shaft 18, and the movement in the left-right direction is restricted.

The deceleration mechanism 12 decelerates the rotation of the motor shaft 15 and transmits it to the lower deceleration mechanism 11. The deceleration mechanism 12 is roughly composed of an upper sun gear 14, an upper planetary gear 22, and an upper carrier 24. Has been done.

The upper positive gear 14 is connected to the motor shaft 15, and a female spline portion (not shown) provided on the inner diameter portion is formed on the lower end side of the motor shaft 15 (not shown). It is spline-coupled to the motor shaft 15 and rotates integrally with the motor shaft 15.

The upper planetary gear 22 is a plurality of planetary gears that mesh with the upper sun gear 14, and the upper planetary gear 22 is rotationally supported by the upper carrier 24. A female spline portion (not shown) provided inside the upper carrier 24 and the upper end side of the lower end sun gear 13 are spline-coupled.

Further, in order to regulate the movement of the upper sun gear 14 to the lower side, a plate 20 is installed between the lower surface of the upper sun gear 14 and the upper surface of the lower sun gear 13. The plate 20 is fitted into the outer diameter of the convex portion 16 provided on the lower side of the motor shaft 15, and the movement in the left-right direction is restricted. The convex portion 16 of the motor shaft 15 and the convex portion 19 of the output shaft 18 are inserted into the inner hole 13a of the lower sun gear 13 in order to ensure the workability of the assembly work.

In the hydraulic motor 10 with a swivel reducer, the plates 20 and 21 are supported on the inner diameter to suppress the size increase of the carriers 24 and 17 on which the plates 20 and 21 are installed, resulting in a compact structure and cost reduction. be able to.

10 Hydraulic motor with reduction gear for turning 11, 12 Planetary gear reduction mechanism (reduction mechanism)
13, 14 Sun gear 15 Motor shaft 16, 19 Convex 17, 24 Carrier 18 Output shaft 20, 21 Plate 22, 23 Planetary gear 25 Housing

Claims (1)

With a motor shaft rotatably supported by the housing,
The upper planetary gear deceleration mechanism that decelerates the rotation of the motor shaft,
A lower planetary gear reduction mechanism provided facing the upper planetary gear reduction mechanism to reduce the rotation of the motor shaft, and a lower planetary gear reduction mechanism.
An output shaft for outputting the rotation decelerated by the lower planetary gear reduction mechanism, and
Equipped with
The upper planetary gear reduction mechanism includes an upper sun gear spline-coupled to the motor shaft, a plurality of upper planetary gears that mesh with the upper sun gear and the internal gear, and revolve around the upper sun gear while rotating around the upper sun gear. With an upper carrier, which rotatably supports multiple upper planetary gears,
The lower planetary gear reduction mechanism makes it possible to rotate the lower sun gear spline-coupled to the upper carrier, a plurality of lower planetary gears that revolve while rotating around the lower sun gear, and the plurality of lower planetary gears. With a lower carrier to support,
A first plate is provided between the lower surface of the upper sun gear and the upper surface of the lower sun gear.
A second plate is provided between the upper surface of the output shaft and the lower surface of the lower sun gear.
The first plate is fitted into the outer diameter of the convex portion of the motor shaft, and the second plate is fitted into the outer diameter of the convex portion of the output shaft. ..

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