KR20140120551A

KR20140120551A - Planetary gear apparatus

Info

Publication number: KR20140120551A
Application number: KR20130036459A
Authority: KR
Inventors: 김태훈
Original assignee: 현대 파워텍 주식회사
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2014-10-14

Abstract

The present invention relates includes an input shaft to which oil is supplied, a pinion shaft which is provided on the outside of the input shaft, a carrier which forms a path which moves oil supplied from the input shaft to the pinion shaft by connecting the input shaft to the pinion shaft, an oil guide for guiding the oil which moves through the path, and a support unit which protrudes from the carrier and supports the oil guide.

Description

[0001] PLANETARY GEAR APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear device, and more particularly, to a planetary gear device capable of easily manufacturing an oil guide, improving oil transfer efficiency, and reducing the size of the device.

Generally, the automatic transmission has a function of transmitting the driving force of the engine to the drive wheels. In such an automatic transmission, the driving force of the engine is transmitted through the planetary gear device to the drive wheel at various speeds, and this planetary gear device usually includes one sun gear and a sun gear which is engaged with the outer periphery of the sun gear, Three pinion gears and a ring gear disposed at the outermost position.

Further, the planetary gear device includes a needle bearing installed between the pinion gear and the pinion shaft for smooth rotation of the pinion gear, which is a high-speed rotation element.

An oil guide having a space corresponding to an oil passage of a pinion shaft is provided on the carrier. The oil guide is provided on the outer circumferential surface of the carrier, Through the operation.

With this structure, the oil subjected to the centrifugal force in the space portion of the oil guide cools and lubricates the needle bearing through the oil passage of the pinion shaft.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2012-0129172 (published on November 28, 2012, entitled "Yusunggi-Gear Transmission").

The conventional planetary gear device has a problem that the manufacturing cost of the oil guide is high and the assembling process of the parts is required because the oil guide device is made up of a plurality of parts and the space occupied by the oil guide device becomes large.

Therefore, there is a need for improvement.

An object of the present invention is to provide a planetary gear device capable of reducing the number of parts, lowering the manufacturing cost, and reducing the number and size of parts.

The present invention relates to an input shaft to which oil is supplied; A pinion shaft installed outside the input shaft; A carrier for connecting the input shaft and the pinion shaft to form a movement path for transferring the oil supplied from the input shaft to the pinion shaft; An oil guide for guiding the movement of the oil moved through the movement path; And a support protruding from the carrier and supporting the oil guide.

The oil guide of the present invention may further comprise: a rim portion seated on the support portion; And a guide portion which is bent at the rim portion and guides the oil guided by the movement path to the pinion shaft.

The oil guide of the present invention may further include a fixing part protruding from the rim and being fitted to the carrier.

Further, the oil guide of the present invention is characterized by injection molding as one body.

The supporting portion of the present invention is characterized in that the rim portion is supported by being separated from an extension of the movement path.

Further, the support portion of the present invention may include: a protrusion formed to protrude from the carrier; And a seating part formed concavely in the protruding part and on which the rim is seated.

In the planetary gear device according to the present invention, the oil guide formed as one body is applied, the manufacturing cost of the oil guide is reduced, and productivity and assemblability are improved.

Further, in the planetary gear device according to the present invention, the size of the oil guide is reduced, and the space required for mounting the device can be reduced.

1 is a perspective view schematically showing a planetary gear device according to an embodiment of the present invention.
2 is a perspective view schematically showing an oil guide according to an embodiment of the present invention.
3 is a cross-sectional view taken along line AA 'in FIG.
4 is a plan view showing a carrier according to an embodiment of the present invention.
5 is a cross-sectional view showing a cross section BB 'of FIG.

Hereinafter, an embodiment of a planetary gear set according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view schematically showing a planetary gear device according to an embodiment of the present invention, 2 is a perspective view schematically showing an oil guide according to an embodiment of the present invention, and FIG. 3 is a cross- Fig.

1 to 3, a planetary gear device 1 according to an embodiment of the present invention includes an input shaft 100, a pinion shaft 200, a carrier 300, an oil guide 400, 500).

The input shaft 100 is configured such that the oil introduced from an engine or the like is supplied. The input shaft 100 is connected to the engine so that the power of the engine (not shown) is transmitted.

In this embodiment, the input shaft 100 is installed at the center of the planetary gear device 1, and a sun gear (not shown) is installed around the input shaft 100 on the outside of the input shaft 100. The structure and operation of the sun gear will be apparent to those skilled in the art, so that a detailed description thereof will be omitted.

An oil passage (not shown) connected to a hydraulic system (not shown) is formed in the input shaft 100. In this embodiment, the oil includes lubricant for cooling and lubricating the planetary gear set 1. [

The oil supplied to the oil passage through the hydraulic system is moved through the oil passage to the outside of the input shaft 100 adjacent to the movement path 320 of the carrier 300 to be described later. The structure and operation of the hydraulic system and the oil passage are obvious to those skilled in the art, so that a detailed description thereof will be omitted.

The pinion shaft 200 is installed outside the input shaft 100. In this embodiment, a plurality of pinion shafts 200 are provided along the outer peripheral surface of the input shaft 100, and a pinion gear 250 is installed outside the pinion shaft 200 to be rotatable about the pinion shaft 200 And is engaged with the sun gear.

In this embodiment, a needle bearing 270 is provided between the pinion shaft 200 and the pinion gear 250 to induce smooth rotation. In addition, an oil passage 220 is formed in the pinion shaft 200 to connect a movement path 320, which will be described later, with the needle bearing 270.

The carrier 300 connects the input shaft 100 and the pinion shaft 200 to form a movement path 320 in which the oil supplied to the input shaft 100 is moved to the pinion shaft 200.

The movement path 320 may be formed in various shapes including a plane on the upper side of the carrier 300 within a technical concept forming a path through which the oil supplied to the input shaft 100 is transferred to the pinion shaft 200.

The movement path 320 corresponds to a surface formed around the pinion shaft insertion hole 330 into which the pinion shaft 200 is inserted and corresponds to a path through which the oil is moved to the pinion shaft 200.

The oil that moves out of the input shaft 100 and moves along the movement path 320 is moved to the guide path oil path 220 of the oil guide 400. [

The oil guide 400 may be formed in various shapes within the technical idea of guiding the movement of the oil moved through the movement path 320.

In this embodiment, the oil guide 400 includes a rim portion 410 and a guide portion 430.

The rim portion 410 is seated on the support portion 500.

In this embodiment, the rim 410 is formed in a ring shape, and the oil guided by the guiding portion 430, which will be described later, does not fall outside the carrier 300 and enters the inside of the pinion shaft 200 . In this embodiment, the rim portion 410 is supported by the support portion 500 which will be described later.

The guide portion 430 guides the oil, which is bent at the rim portion 410 and guided by the movement path 320, to the pinion shaft 200. The guide portion 430 is bent in a direction away from the movement path 320 (upper side in FIG. 3) to increase the ratio of the movement through the movement path 320.

FIG. 4 is a plan view showing a carrier according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line B-B 'of FIG.

4 and 5, the oil guide 400 further includes a fixing portion 450 in this embodiment. The fixing portion 450 may have various shapes and configurations within the technical idea of fixing the oil guide 400 to the carrier 300.

In the present embodiment, a plurality of fixing portions 450 are formed on the rim portion 410 and are fitted into the fixing groove portion 350 formed corresponding to the carrier 300.

In this embodiment, the oil guide 400 includes a synthetic resin and is integrally injection-molded. Thus, the oil guide 400 does not require a separate assembly process, and the production cost is reduced at a low unit price, and the size of the apparatus can be reduced, thereby reducing the overall length of the planetary gear device 1.

The support portion 500 supports the rim portion 410 at a distance "d" from the extension of the movement path 320 so that the oil guided through the movement path 320 is guided by the pinion shaft 200 and the oil guide 400 So that the oil can be guided to the pinion shaft 200 side without leaking to the outside.

In this embodiment, the support portion 500 includes the projecting portion 510 and the seating portion 530.

The protrusion 510 protrudes from one side of the carrier 300. The protrusion 510 protrudes upward from the carrier 300 (refer to FIG. 4), and is formed integrally with the carrier 300.

The seating portion 530 is recessed in the projection 510, and the frame portion 410 is seated. The seat portion 530 supports the edge portion 410 so that the edge portion 410 is spaced apart from the movement path 320 so that the edge portion 410 can be separated from the edge portion 410, And the pinion shaft 200, as shown in Fig.

The operation principle of the planetary gear device 1 according to one embodiment of the present invention will be described below.

When the vehicle starts running, the input shaft 100 is rotated by the power of the engine. The input shaft 100 is connected to the hydraulic system so that when the input shaft 100 rotates, oil is transferred to the carrier 300 through the oil passage of the input shaft 100 by centrifugal force.

The oil transferred to the carrier 300 moves outward from the center of the carrier 300 and is guided to the pinion shaft 200 side via the movement path 320.

Further, the oil guided to the pinion shaft 200 side enters the oil passage 220 through the movement path 320. At this time, the area of the inlet where the oil is guided to the pinion shaft 200 side in the curved shape of the guide portion 430 is enlarged, thereby preventing the oil from flowing out and allowing the oil to be transmitted to the oil passage 220.

Further, since the rim portion 410 integrally formed with the guide portion 430 is spaced apart from the movement path 320 by a distance d from the upper side (reference to FIG. 5), the cross section of the passage through which the oil enters is increased, Thereby preventing the oil from leaking out of the oil guide 400 and raising the ratio of the oil delivered to the oil passage 220.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

Accordingly, the true scope of the present invention should be determined by the following claims.

1: planetary gear unit 100: input shaft
200: pinion shaft 220: oil passage
250: Pinion gear 260: Needle bearing
300: Carrier 320: Movement path
350: fixing groove portion 400: oil guide
410: rim portion 430: guide portion
450: fixing part 500: supporting part
510: protruding portion 530:

Claims

An input shaft to which oil is supplied;
A pinion shaft installed outside the input shaft;
A carrier for connecting the input shaft and the pinion shaft to form a movement path for transferring the oil supplied from the input shaft to the pinion shaft;
An oil guide for guiding the movement of the oil moved through the movement path; And
And a support portion protruding from the carrier to support the oil guide.

The method according to claim 1,
The oil guide
A rim portion seated on the support portion; And
A guide portion which is bent at the rim portion and guides the oil guided by the movement path to the pinion shaft;
Wherein the planetary gear set includes:

3. The method of claim 2,
The oil guide
And a fixing portion protruding from the rim portion and fitted in the carrier.

4. The method according to any one of claims 1 to 3,
The oil guide
And is injection-molded as one body.

3. The method of claim 2,
The support portion
And the rim portion is spaced apart from an extension of the movement path.

6. The method of claim 5,
The support portion
A projection protruding from the carrier; And
A seating part formed concavely in the projection and on which the rim is seated;
Wherein the planetary gear set includes: