JP2015045392A - Speed change gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speed change gear which inhibits a lubrication oil from intruding to a rotary electric machine with a simple structure and thereby achieves price reduction of the rotary electric machine.SOLUTION: A speed change gear 10 according to the invention includes a planetary gear mechanism 14 provided in a housing 12, the planetary gear mechanism 14 in which a first shaft part 102 of a rotary electric machine 100 is connected with a second shaft part 104 located under a lubrication environment. A wall part 26 extending in a radial direction at the outer periphery side of a ring gear 36 connected with the second shaft part 104 is formed in the housing 12. The speed change gear 10 includes a flange part 50 which is provided so as to rotate with the ring gear 36, located close to the wall part 26, and faces the wall part 26.

Description

  The present invention relates to a transmission including a planetary gear mechanism in which a first shaft portion of a rotating electrical machine and a second shaft portion in a lubrication environment are connected.

  The electric power steering device includes a reduction device that reduces the rotational driving force of the motor and transmits it to the output shaft. This kind of reduction gear includes, for example, a planetary gear including a sun gear coupled to a drive shaft portion of a motor, a planetary gear meshing with the sun gear, and a ring gear coupled to the output shaft portion and meshing with the planetary gear. It has a mechanism (see Patent Document 1).

JP-A-8-291848

  However, in the above-described prior art, the reduction mechanism is not provided with a seal mechanism that prevents the flow of the lubricating oil, so the lubricating oil on the output shaft side may enter the motor via the planetary gear mechanism. In this case, it is necessary to use a motor having an oil resistance function, and there is a risk that the motor (rotary electric machine) will rise.

  The present invention has been made in view of such problems, and a transmission that can suppress the intrusion of lubricating oil into a rotating electrical machine with a simple configuration, thereby reducing the cost of the rotating electrical machine. The purpose is to provide.

  A transmission according to the present invention is a transmission including a housing, and a planetary gear mechanism provided in the housing and connected to a first shaft portion of a rotating electrical machine and a second shaft portion in a lubricating environment. The planetary gear mechanism includes a sun gear, a planetary gear meshing with the sun gear, and a ring gear coupled to the second shaft portion and meshing with the planetary gear, and the housing includes the ring gear A wall portion extending in a radial direction is formed on the outer peripheral side of the gear, and a seal portion that is rotatably provided with the ring gear and is opposed to the wall portion is provided.

  According to the transmission according to the present invention, since the seal portion facing the wall portion extending in the radial direction on the outer peripheral side of the ring gear is provided, the lubricating oil on the second shaft portion side is configured with a simple configuration. Can be prevented from entering the rotating electrical machine via the planetary gear mechanism. Thereby, since it is not necessary to provide an oil-proof function in the rotating electrical machine itself, the cost of the rotating electrical machine can be reduced.

  In the above transmission, the sun gear, the planetary gear, and the ring gear may be made of a resin material that does not have oil resistance.

  According to such a configuration, the transmission can be reduced in weight compared to the case where the sun gear, the planetary gear, and the ring gear are made of a metal material. Moreover, since the resin material which does not have oil resistance is used, the manufacturing cost of a transmission can be reduced compared with the case where an oil resistant resin material is used. In addition, since the intrusion of the lubricating oil into the planetary gear mechanism is suppressed by the seal portion, the sun gear, the planetary gear and the ring gear made of a resin material having no oil resistance are not deteriorated by the lubricating oil. .

  The transmission may include a holding portion for holding the second shaft portion on the ring gear, and the seal portion may be formed integrally with the holding portion.

  According to such a configuration, the number of parts and the number of assembly steps of the transmission can be reduced as compared with a configuration in which the seal portion is provided separately from the holding portion.

  In the above transmission, the wall portion may be formed in an annular shape, and the seal portion may be formed in an annular shape while extending in a radial direction of the ring gear. In this case, the penetration of the lubricating oil into the planetary gear mechanism can be efficiently suppressed.

  In the above transmission, the housing may be formed with an annular projecting portion projecting from the wall portion toward the second shaft portion, and the seal portion may be close to the projecting portion.

  According to such a configuration, since the protruding portion and the seal portion are close to each other, the intrusion of the lubricating oil into the planetary gear mechanism can be more efficiently suppressed.

  According to the transmission of the present invention, since the seal portion is provided in the vicinity of the wall portion extending in the radial direction on the outer peripheral side of the ring gear, the lubricating oil can enter the rotating electrical machine with a simple configuration. Thus, the cost of the rotating electrical machine can be reduced.

It is a longitudinal cross-sectional view of the transmission which concerns on one Embodiment of this invention. It is a partially expanded sectional view of the transmission shown in FIG.

  Hereinafter, preferred embodiments of a transmission according to the present invention will be described with reference to the accompanying drawings.

  The transmission 10 according to the present embodiment can be applied to various devices such as a variable valve timing control device for an internal combustion engine, a transmission control device for a transmission, and an electric power steering device.

  As shown in FIG. 1, the transmission 10 shifts and transmits a rotational driving force between the first shaft portion 102 of the rotating electrical machine 100 and the second shaft portion 104 in a lubrication environment. The rotating electrical machine 100 is used as an electric motor or a generator, for example.

  The second shaft portion 104 includes a second shaft portion main body 106 disposed coaxially with the first shaft portion 102, and an annular connecting portion 108 extending radially outward from the second shaft portion main body 106. Have. An annular gear 110 is fitted on the second shaft body 106.

  The transmission 10 includes a housing 12 and a planetary gear mechanism 14 provided in the housing 12 to which a first shaft portion 102 of the rotating electrical machine 100 and a connecting portion 108 of the second shaft portion 104 are connected. The housing 12 includes an annular support wall 18 provided with a bearing 16 that supports the first shaft 102 of the rotating electrical machine 100, and extends from the outer periphery of the support wall 18 to one side (in the direction of arrow A). The protruding side wall portion 20 and the attachment portion 22 that extends in the radial direction of the first shaft portion 102 are connected to the side wall portion 20. The outer diameter dimension of the support wall portion 18 is formed larger than the outer diameter dimension of the planetary gear mechanism 14.

  The side wall portion 20 is located on the outer peripheral side of the planetary gear mechanism 14. The side wall 20 includes a first wall 24 that protrudes from the outer periphery of the support wall 18 to one side, and an annular second wall that protrudes radially outward from the tip of the first wall 24. (Wall portion) 26 and a third wall portion (projecting portion) 28 that projects from the outer peripheral portion of the second wall portion 26 to one side and continues to the attachment portion 22. The protruding lengths of the first to third wall portions 24, 26, and 28 can be arbitrarily set. The attachment portion 22 is attached to a hydraulic device such as a transmission, for example.

  The planetary gear mechanism 14 is accommodated in the housing 12 in a state of being located inside the side wall portion 20. The planetary gear mechanism 14 includes a sun gear 30 that is externally fitted to the first shaft portion 102, a plurality of planetary gears 32 that mesh with the sun gear 30, a carrier 34 that holds the positional relationship between these planetary gears 32, and a plurality of planetary gears 32. And a ring gear 36 that meshes with the planetary gear 32.

  The sun gear 30 and each planetary gear 32 are configured as annular external gears, and the ring gear 36 is configured as an internal gear. In this embodiment, the sun gear 30, each planetary gear 32, and the ring gear 36 are comprised with the resin material which does not have oil resistance. This effect will be described later. However, the sun gear 30, each planetary gear 32, and the ring gear 36 can be made of any material such as a metal material, for example.

  The carrier 34 includes a plurality of support pins 38 through which the planetary gears 32 are inserted, and an annular portion 40 to which one end of the support pins 38 is fixed. Each support pin 38 is provided with a bearing 42 that pivotally supports each planetary gear 32, and the annular portion 40 is provided with a bearing 44 that pivotally supports the second shaft portion 104. The other end of each support pin 38 is fixed to the support wall 18. That is, in the present embodiment, the carrier 34 is fixed to the housing 12 via the plurality of support pins 38.

  On the outer peripheral surface of the ring gear 36, an annular groove 46 is formed in which the outer peripheral portion of the connecting portion 108 constituting the second shaft portion 104 is disposed. Thereby, one side of the planetary gear mechanism 14 is covered with the second shaft portion 104. That is, the inflow of the lubricating oil on the second shaft portion 104 side to the planetary gear mechanism 14 is suppressed. The connecting portion 108 is in contact with one surface of the ring gear 36.

  On the outer periphery of the ring gear 36, there are a holding plate (holding portion) 48 for holding the connecting portion 108 on the ring gear 36, and a flange portion (seal) extending from the holding plate 48 to the outside in the radial direction of the ring gear 36. Part) 50. That is, the holding plate 48 and the flange portion 50 rotate together with the ring gear 36.

  The holding plate 48 and the flange portion 50 are integrally formed, for example, by press-molding an annular plate. In this case, compared to a configuration in which the holding plate 48 and the flange portion 50 are provided separately, the number of parts and the number of assembly steps of the transmission 10 can be reduced. However, the holding plate 48 and the flange portion 50 may be configured separately.

  As shown in FIG. 2, the holding plate 48 is provided on the outer peripheral side of the ring gear 36, the cylindrical portion 52 with which the outer peripheral portion of the connecting portion 108 abuts, and the other end portion of the cylindrical portion 52 (the end portion in the arrow B direction). ) Projecting inwardly and abutting portion 54 abutting against the other surface of the ring gear 36. As a result, the ring gear 36 is held between the holding plate 48 and the connecting portion 108.

  The flange portion 50 extends in the radial direction of the ring gear 36 from one end portion of the cylindrical portion 52 to the vicinity of the third wall portion 28 and is formed in an annular shape. That is, the flange portion 50 is close to and opposed to the second wall portion 26 extending in the radial direction on the outer peripheral side of the ring gear 36 and is close to the third wall portion 28.

  The distance L1 between the flange portion 50 and the second wall portion 26 can be set to be equal to or less than the thickness dimension of the flange portion 50, for example. Thereby, it can suppress suitably that the lubricating oil by the side of the 2nd axial part 104 distribute | circulates the clearance gap between the flange part 50 and the 2nd wall part 26. FIG.

  The interval L2 between the flange portion 50 and the third wall portion 28 may be set slightly larger than the interval L1. In this case, it is possible to prevent the dimensional tolerance of the outer diameter of the flange portion 50 from becoming excessively strict. That is, even when an appropriate dimensional tolerance is set for the outer diameter of the flange portion 50, the flange portion 50 and the third wall portion 28 do not contact each other.

  The transmission 10 according to the present embodiment is basically configured as described above, and the operation and effect thereof will be described below.

  In the present embodiment, for example, when the rotary electric machine 100 is used as an electric motor, when the first shaft portion (drive shaft portion) 102 of the rotary electric machine 100 is rotationally driven, the sun gear 30 that is externally fitted to the first shaft portion 102 is A plurality of planetary gears 32 meshing with the sun gear 30 rotate while rotating. At this time, since the carrier 34 is fixed to the housing 12 via the support pins 38, the plurality of planetary gears 32 rotate without revolving around the sun gear 30. When the plurality of planetary gears 32 rotate, the ring gear 36 meshing with the planetary gears 32 rotates, and the second shaft portion (output shaft portion) 104 connected to the ring gear 36 rotates. Thereby, the rotational driving force of the first shaft portion 102 of the rotating electrical machine 100 is decelerated by the transmission 10 and transmitted to the second shaft portion 104.

  On the other hand, for example, when the rotary electric machine 100 is used as a generator, when the second shaft portion 104 is driven to rotate, the first shaft portion 102 rotates via the ring gear 36, the plurality of planetary gears 32, and the sun gear 30. As a result, the rotational driving force of the second shaft portion 104 is accelerated by the transmission 10 and transmitted to the first shaft portion 102.

  According to the present embodiment, since the flange portion 50 is provided on the outer peripheral side of the ring gear 36 so as to face the second wall portion 26 extending in the radial direction, the flange portion 50 faces the second shaft portion 104 side with a simple configuration. Can be prevented from entering the rotating electrical machine 100 via the planetary gear mechanism 14. Thereby, since it is not necessary to provide an oil-proof function in the rotary electric machine 100 itself, the cost of the rotary electric machine 100 can be reduced.

  Further, since the flange portion 50 extends in the radial direction of the ring gear 36 and is formed in an annular shape, the penetration of the lubricating oil into the planetary gear mechanism 14 can be efficiently suppressed. Furthermore, since the flange portion 50 is close to the annular third wall portion 28 that protrudes from the second wall portion 26 toward the second shaft portion main body 106 side, the lubricant oil can further enter the planetary gear mechanism 14. It can be suppressed efficiently.

  In this embodiment, the sun gear 30, each planetary gear 32, and the ring gear 36 are comprised with the resin material which does not have oil resistance. Therefore, the transmission 10 can be reduced in weight compared to the case where these gears are made of a metal material. Moreover, the manufacturing cost of the transmission 10 can be reduced compared with the case where an oil-resistant resin material is used. Since the intrusion of the lubricating oil into the planetary gear mechanism 14 is suppressed by the flange portion 50, the sun gear 30, each planetary gear 32, and the ring gear 36 made of a resin material that does not have oil resistance are used as the lubricating oil. Will not deteriorate.

  According to this embodiment, since the holding plate 48 and the flange portion 50 for holding the connecting portion 108 of the second shaft portion 104 on the ring gear 36 are integrally formed, these members are provided separately. Compared with the configuration, it is possible to reduce the number of parts and the number of assembly steps of the transmission 10.

  The transmission 10 according to the present embodiment is not limited to the configuration described above. For example, the holding plate 48 may be formed integrally with the second shaft portion 104. In this case, the number of parts can be further reduced.

  Further, the first shaft portion 102 of the rotating electrical machine 100 may be connected to the carrier 34. In this case, the sun gear 30 is fixed and each planetary gear 32 revolves while rotating around the sun gear 30. Even with such a configuration, it is possible to transmit the rotational driving force while changing the speed between the first shaft portion 102 and the second shaft portion 104 of the rotating electrical machine 100.

  Of course, the transmission according to the present invention is not limited to the above-described embodiment, and can adopt various configurations or processes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Transmission 12 ... Housing 14 ... Planetary gear mechanism 18 ... Support wall part 20 ... Side wall part 22 ... Mounting part 24 ... 1st wall part 26 ... 2nd wall part (wall part)
28 ... 3rd wall part (projection part) 30 ... Sun gear 32 ... Planetary gear 34 ... Carrier 36 ... Ring gear 48 ... Holding plate (holding part)
DESCRIPTION OF SYMBOLS 50 ... Flange part 100 ... Rotary electric machine 102 ... 1st axial part 104 ... 2nd axial part

Claims (5)

In a transmission comprising: a housing; and a planetary gear mechanism provided in the housing and connected to a first shaft portion of a rotating electrical machine and a second shaft portion in a lubricating environment.
The planetary gear mechanism is
With sun gear,
A planetary gear meshing with the sun gear;
A ring gear coupled to the second shaft portion and meshing with the planetary gear,
The housing is formed with a wall portion extending radially on the outer peripheral side of the ring gear,
A seal portion provided rotatably with the ring gear and facing the wall portion;
A transmission characterized by that. The transmission according to claim 1, wherein
The sun gear, the planetary gear, and the ring gear are made of a resin material that does not have oil resistance.
A transmission characterized by that. The transmission according to claim 1 or 2,
A holding portion for holding the second shaft portion on the ring gear;
The seal part is formed integrally with the holding part,
A transmission characterized by that. The transmission according to any one of claims 1 to 3,
The wall portion is formed in an annular shape,
The seal portion extends in the radial direction of the ring gear and is formed in an annular shape.
A transmission characterized by that. The transmission according to claim 4, wherein
The housing is formed with an annular projecting portion projecting from the wall portion toward the second shaft portion side,
The seal portion is proximate to the protruding portion;
A transmission characterized by that.

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