CN215890976U - Hydraulic motor with speed reducer for rotation - Google Patents
Hydraulic motor with speed reducer for rotation Download PDFInfo
- Publication number
- CN215890976U CN215890976U CN202120838936.7U CN202120838936U CN215890976U CN 215890976 U CN215890976 U CN 215890976U CN 202120838936 U CN202120838936 U CN 202120838936U CN 215890976 U CN215890976 U CN 215890976U
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- sun gear
- plate
- reduction mechanism
- gear
- motor shaft
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Abstract
By supporting the plate in the inner diameter, the carrier provided with the plate is suppressed from increasing in size, resulting in a compact structure. The hydraulic motor with a rotation speed reducer has a lower speed reduction mechanism and an upper speed reduction mechanism. The sun gear of the reduction mechanism is disposed coaxially with the motor shaft by spline coupling. A projection is formed at the front end of the motor shaft, and the front end of the projection is inserted into the inner hole at the upper surface of the sun gear of the reduction mechanism. The carrier is engaged with a gear formed on the output shaft, and a protrusion is formed at the front end of the output shaft, and the front end of the protrusion is inserted into the inner hole at the lower surface of the sun gear. A plate is mounted between the upper surface of the sun gear and the lower surface of the sun gear, and the plate is fitted to the outer diameter of the convex portion inserted into the motor shaft. A plate is fitted between the lower surface of the sun gear and the upper surface of the output shaft, and the plate is fitted to the outer diameter of the convex portion of the output shaft.
Description
Technical Field
The present invention relates to a hydraulic motor with a turning reduction gear used for turning of a hydraulic excavator, a crane, or the like.
Background
Conventionally, as shown in the figure of patent document 1, for example, a reduction mechanism of a hydraulic motor with a rotation reduction gear of this type has a lower-stage planetary gear reduction mechanism 24 and an upper-stage planetary gear reduction mechanism 25 provided in a casing 16, sun gears 24A and 26 of these planetary gear reduction mechanisms 24 and 25 are positioned coaxially, a plate 35 is provided between an upper surface of the sun gear 24A and a lower surface of the sun gear 26 so that these sun gears 24A and 26 do not directly contact each other, the plate 35 is fitted in a recess (not shown) formed in a carrier 28, and the movement of the plate 35 in the vertical and horizontal directions is restricted by the outer diameter of the plate 35 and the recess.
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 is fitted in a recess formed in the carrier 24C to restrict movement in the vertical and horizontal directions (see, for example, patent document 1).
In patent document 1, when a mechanism for restricting the movement of the plate is provided in the carrier, the carrier is supported by the outer diameter of the carrier, and therefore the size of the carrier itself increases, which causes an increase in product cost.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2015-113851
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hydraulic motor with a reduction gear for turning, which is capable of suppressing an increase in size of a carrier provided with a plate by supporting the plate with an inner diameter, thereby achieving a compact structure and suppressing cost.
Means for solving the problems
The utility model provides a hydraulic motor with reduction gear for gyration for solving above-mentioned problem, its characterized in that, the hydraulic motor with reduction gear for gyration possesses: a motor shaft rotatably supported by the housing;
an upper planetary gear reduction mechanism that reduces the rotation of the motor shaft;
a lower planetary gear reduction mechanism that is provided opposite to the upper planetary gear reduction mechanism and reduces the rotation of the motor shaft; and
an output shaft for outputting the rotation reduced by the lower planetary gear reduction mechanism,
the upper planetary gear reduction mechanism includes: an upper stage sun gear spline-coupled with the motor shaft; a plurality of upper planetary gears which are meshed with the upper sun gear and the internal gear and revolve around the upper sun gear while rotating; and an upper stage carrier rotatably supporting the plurality of upper stage planetary gears,
the lower planetary gear reduction mechanism includes: a lower sun gear spline-coupled to the upper planet carrier; a plurality of lower planetary gears that revolve around the lower sun gear while rotating on their axes; and a lower stage carrier rotatably supporting the plurality of lower stage planetary gears,
a first plate is disposed between a lower surface of the upper stage sun gear and an upper surface of the lower stage sun gear,
a second plate is provided between an upper surface of the output shaft and a lower surface of the lower stage sun gear,
the first plate is fitted and inserted in an outer diameter of a convex portion of the motor shaft, and the second plate is fitted and inserted in an outer diameter of a convex portion of the output shaft.
Effect of the utility model
In the present invention, the convex portions of the motor shaft and the output shaft are inserted into the inner diameter portion of the plate, so that the plate can be prevented from moving in the vertical and horizontal directions. Therefore, the size of the plate can be suppressed, a compact structure can be achieved, and the cost can be suppressed.
Drawings
Fig. 1 is a schematic longitudinal sectional view of a main portion of a hydraulic motor with a reduction gear for turning according to an embodiment of the present invention.
Description of reference numerals:
10 hydraulic motor with speed reducer for rotation
11. 12 Planet gear speed reducing mechanism (speed reducing mechanism)
13. 14 sun gear
15 Motor shaft
16. 19 convex part
17. 24 planetary carrier
18 output shaft
20. 21 plate
22. 23 planetary gear
25 casing.
Detailed Description
Hereinafter, a hydraulic motor with a reduction gear for turning according to the present invention will be described in detail with reference to the accompanying drawings by referring to preferred embodiments.
Fig. 1 is a schematic longitudinal sectional view of a main part of a hydraulic motor 10 with a reduction gear for turning according to an embodiment of the present invention. The hydraulic motor with a turning reduction gear 10 includes a lower planetary gear reduction mechanism 11 (hereinafter referred to as a reduction mechanism 11) and an upper planetary gear reduction mechanism 12 (hereinafter referred to as a reduction mechanism 12) accommodated in a housing 25.
The reduction mechanism 11 reduces the rotation of the reduction mechanism 12 and transmits the rotation to the output shaft 18, and the reduction mechanism 11 includes: a lower sun gear 13 spline-coupled to an upper carrier 24 of the reduction mechanism 12; a plurality of lower planetary gears 23 that revolve around the lower sun gear 13 while rotating on its axis; and a lower planetary carrier 17 rotatably supporting the lower planetary gear 23. The lower stage carrier 17 of the reduction mechanism 11 is spline-coupled by an externally splined portion (not shown) provided on the upper end side of the output shaft 18. Further, a plate 21 is provided between the lower surface of the lower sun gear 13 and the upper surface of the output shaft 18 in order to restrict the lower sun gear 13 from moving downward. The plate 21 is fitted into the outer diameter of the projection 19 provided on the upper side of the output shaft 18, and is restricted from moving in the left-right direction.
The reduction mechanism 12 reduces the rotation of the motor shaft 15 and transmits the reduced rotation to the reduction mechanism 11 of the lower stage, and the reduction mechanism 12 is configured to include a substantially upper sun gear 14, an upper planetary gear 22, and an upper carrier 24.
The upper sun gear 14 is connected to the motor shaft 15, and an inner spline portion (not shown) provided on an inner diameter portion of the upper sun gear 14 is spline-coupled to an outer spline portion (not shown) formed on a lower end side of the motor shaft 15, so that the upper sun gear 14 and the motor shaft 15 rotate integrally.
The upper planetary gear 22 is a plurality of planetary gears meshing with the upper sun gear 14, and the upper planetary gear 22 is rotatably supported by an upper carrier 24. An internally splined portion (not shown) provided inside the upper carrier 24 is spline-coupled to the upper end side of the lower sun gear 13.
Further, a plate 20 is provided between the lower surface of the upper sun gear 14 and the upper surface of the lower sun gear 13 in order to restrict the upper sun gear 14 from moving downward. The plate 20 is fitted into the outer diameter of the projection 16 provided on the lower side of the motor shaft 15, and is restricted from moving in the left-right direction. 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 workability in the assembly work.
In the hydraulic motor 10 with a reduction gear for rotation, by supporting the plates 20 and 21 in the inner diameter, it is possible to suppress an increase in the size of the carriers 24 and 17 provided with the plates 20 and 21, and to achieve a compact structure and suppress cost.
Claims (1)
1. A hydraulic motor with a speed reducer for rotation is characterized in that,
the hydraulic motor with a turning reduction gear includes:
a motor shaft rotatably supported by the housing;
an upper planetary gear reduction mechanism that reduces the rotation of the motor shaft;
a lower planetary gear reduction mechanism that is provided opposite to the upper planetary gear reduction mechanism and reduces the rotation of the motor shaft; and
an output shaft for outputting the rotation reduced by the lower planetary gear reduction mechanism,
the upper planetary gear reduction mechanism includes: an upper stage sun gear spline-coupled with the motor shaft; a plurality of upper planetary gears which are meshed with the upper sun gear and the internal gear and revolve around the upper sun gear while rotating; and an upper stage carrier rotatably supporting the plurality of upper stage planetary gears,
the lower planetary gear reduction mechanism includes: a lower sun gear spline-coupled to the upper planet carrier; a plurality of lower planetary gears that revolve around the lower sun gear while rotating on their axes; and a lower stage carrier rotatably supporting the plurality of lower stage planetary gears,
a first plate is disposed between a lower surface of the upper stage sun gear and an upper surface of the lower stage sun gear,
a second plate is provided between an upper surface of the output shaft and a lower surface of the lower stage sun gear,
the first plate is fitted and inserted in an outer diameter of a convex portion of the motor shaft, and the second plate is fitted and inserted in an outer diameter of a convex portion of the output shaft.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-124263 | 2020-07-21 | ||
| JP2020124263A JP2022020961A (en) | 2020-07-21 | 2020-07-21 | Hydraulic motor with turning reduction gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215890976U true CN215890976U (en) | 2022-02-22 |
Family
ID=80220103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120838936.7U Active CN215890976U (en) | 2020-07-21 | 2021-04-22 | Hydraulic motor with speed reducer for rotation |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2022020961A (en) |
| CN (1) | CN215890976U (en) |
-
2020
- 2020-07-21 JP JP2020124263A patent/JP2022020961A/en active Pending
-
2021
- 2021-04-22 CN CN202120838936.7U patent/CN215890976U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022020961A (en) | 2022-02-02 |
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