JP2015218750A - Bearing device for supporting gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for supporting a gear which can significantly decrease the size and reduce the torque loss, thereby improving the fuel consumption of a vehicle.SOLUTION: As a plurality of bearings supporting an input shaft 3, there are provided a slide bearing 6 in one side of the helical gear 4 in the axial direction, and a cylindrical roller bearing 8 in the other side.

Description

  The present invention relates to a gear support bearing device that supports a helical gear.

  From the viewpoint of improving fuel efficiency, automobile transmissions are strongly required to be small and highly efficient. In general, a ball bearing has a smaller torque than a tapered roller bearing used in a state where a preload is applied, and is frequently used in a transmission. However, the ball bearing tends to be large in size and may be restricted in layout. For example, as a bearing device that supports a rotating shaft having a gear, one side is a slide bearing and the other is a ball bearing, and the thrust load in both directions generated by the meshing of the gear is supported by the ball bearing, and only the radial load is applied to the slide bearing. A structure to be supported is known.

  In the power transmission device 100 described in Patent Document 1, as shown in FIG. 3, the drive-side helical gear 101 and the helical gear 101 are respectively meshed with each other, and the driven-side first and first helical gears are different in torsional direction. 2 includes helical gears 102 and 103, and a linear driving means 104 for moving the second helical gear 103 in the axial direction, between the first helical gear 102 and the second helical gear 103. The output shaft 105 that supports the first and second helical gears 102 and 103 includes a slide bearing 106 and a pair of angular ball bearings 107. Is supported by.

JP 2009-115168 A

  By the way, as described above, it is possible to reduce the size by using a slide bearing on one side as a bearing that supports the rotating shaft. However, in the other ball bearing, it is necessary to support both thrust loads. There is a problem that the size will increase. Further, the ball of the ball bearing is elastically deformed when a load is applied, and torque loss due to differential sliding occurs.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a gear support that can significantly reduce the size of the bearing and can reduce the torque loss and improve the fuel efficiency of the vehicle. It is to provide a bearing device for use.

The above object of the present invention can be achieved by the following constitution.
(1) a rotating shaft having a helical gear;
A plurality of bearings respectively supporting the rotating shaft on both sides in the axial direction of the helical gear;
A gear support bearing device comprising:
The plurality of bearings include a plain bearing on one side in the axial direction of the helical gear and a cylindrical roller bearing on the other side in the axial direction.
(2) The outer ring and the inner ring of the cylindrical roller bearing each include at least one flange portion,
The gear support bearing device according to (1), wherein the flange portion of the outer ring and the inner ring supports an axial load acting on the rotating shaft toward the other side in the axial direction.
(3) The cylindrical roller bearing supports a radial load during driving of the vehicle, and supports the axial load by the flange in addition to the radial load during coasting of the vehicle. 2. The gear support bearing device according to 2).
(4) The gear support bearing device according to (3), wherein the plurality of bearings further include a thrust needle bearing that supports the axial load when the vehicle is driven on one side in the axial direction. .

  According to the gear supporting bearing device of the present invention, as the plurality of bearings for supporting the rotating shaft, the helical gear is provided with a sliding bearing on one axial side and a cylindrical roller bearing on the other axial side. Therefore, the cylindrical roller bearing can greatly reduce the size of the bearing and can reduce the torque loss and improve the fuel efficiency of the vehicle.

It is the schematic which shows the general transmission applicable to this invention. It is a principal part half sectional view of the cylindrical roller bearing which concerns on one Embodiment of this invention. It is sectional drawing which shows the conventional power transmission device.

  Hereinafter, a gear support bearing device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram of a transmission 1 of an automobile. Engine torque output from an engine ENG is input to an input shaft (rotary shaft) 3 via a torque converter 2. The input shaft 3 rotates at the same rotation speed as the engine ENG (maximum 7500 rpm).

  A helical gear 4 is provided at an intermediate portion of the input shaft 3 and meshes with a gear of a driven shaft (not shown) to transmit torque to the driven shaft. The input shaft 3 is bent by a radial load acting on the helical gear 4.

  The input shaft 3 includes a flange portion 5 on the engine side (one axial side) with respect to the helical gear 4, and a slide bearing 6 is provided on the outer peripheral surface of the flange portion 5. A thrust needle bearing 7 is provided on the side surface. A cylindrical roller bearing 8 is provided on the side opposite to the engine (the other side in the axial direction) with respect to the helical gear 4.

  Therefore, the radial load acting on the input shaft 3 is supported by the slide bearing 6 and the cylindrical roller bearing 8. Further, when the vehicle is driven (acceleration, steady travel), the axial load acting on the input shaft 3 in the left direction (engine side) by the helical gear 4 is received by the thrust needle bearing 7 and during coast travel ( An axial load acting on the input shaft 3 in the right direction during engine braking is received by an outer ring rod 12 and an inner ring rod 22 of a cylindrical roller bearing 8 described later.

  Thus, in the input shaft 3, the axial size is significantly reduced by combining the sliding bearing 6 on one side in the axial direction with the thin thrust needle bearing 7 on the other side and the cylindrical roller bearing 8 on the other side in the axial direction. Can be achieved.

  As shown in FIG. 2, the cylindrical roller bearing 8 applied to the transmission 1 has an outer ring raceway surface 11 on an inner peripheral surface and a pair of outer ring rods 12 provided on both sides in the axial direction of the outer ring raceway surface 11. An inner ring 20 having an outer ring 10 having an inner ring raceway surface 21 and an inner ring rod 22 provided on one axial side of the inner ring raceway surface 21, an outer ring raceway surface 11, and an inner ring raceway surface. And a plurality of cylindrical rollers 30 disposed between the outer ring guide 21 and an outer ring guide type retainer 40 having a plurality of pockets 41 for holding the cylindrical rollers 30 at a predetermined interval.

  That is, the cylindrical roller bearing 1 is provided with outer ring rods 12 at both axial ends of the outer ring 10 and an inner ring rod 22 at one axial end portion (end portion on the engine side) of the inner ring 20. When receiving only a radial load, during coasting, in addition to the radial load, the outer ring rod 12 at the right end portion of the outer ring 10 and the inner ring rod 22 at the left end portion of the inner ring 20 are directed toward the other side in the axial direction (anti-engine side). The axial load acting on the input shaft 3 is received.

  Further, when a load is applied to the input shaft 3, the inner ring 20 of the cylindrical roller bearing 1 fixed to the input shaft 3 is inclined relative to the outer ring 10 due to the influence of the deflection of the input shaft 3, component accuracy, and the like. There is a case.

As described above, according to the gear supporting bearing device of the present embodiment, the plurality of bearings that support the input shaft 3 include the plain bearing 6 on one side in the axial direction of the helical gear 4, and the axial direction Since the cylindrical roller bearing 8 is provided on the other side, the cylindrical roller bearing 8 can significantly reduce the size of the bearing and can reduce the torque loss and improve the fuel efficiency of the vehicle.
In particular, the load is supported by the cylindrical roller bearing in which the raceway surface and the cylindrical roller are in line contact as compared with the case where a ball bearing in which the raceway surface of the raceway and the ball rolling surface are in point contact is used. Can be reduced in size.

  Further, since the outer ring 10 and the inner ring 20 of the cylindrical roller bearing 8 are provided with at least one flange part 12, 22, respectively, the input toward the other side in the axial direction by the flange parts 12, 22 of the outer ring 10 and the inner ring 20. An axial load acting on the shaft 3 can be supported.

  The cylindrical roller bearing 8 supports a radial load when the vehicle is driven, and supports an axial load with the flanges 12 and 22 in addition to the radial load when the vehicle is coasted. Therefore, when the cylindrical roller bearing 8 receives an axial load during driving, friction between the cylindrical roller and the flange increases, but in this embodiment, the thrust needle bearing 7 supports the axial load during driving. Therefore, the cylindrical roller bearing 8 that receives only a radial load during driving travel can significantly reduce torque loss as compared with the case where a ball bearing is used, and can improve the fuel efficiency of the automobile.

In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In the said embodiment, although the cylindrical roller bearing of this invention was demonstrated as what is applied to a transmission, it is not limited to this, You may apply to another apparatus.
Moreover, although this embodiment demonstrated the bearing apparatus which supports an input shaft, this invention is not limited to this, It can apply also to the bearing apparatus which supports a driven shaft.
Furthermore, the inner ring | wheel and outer ring | wheel of the cylindrical roller bearing of this invention should just be a structure each provided with at least 1 collar part.

1 Transmission 3 Input shaft (rotary shaft)
4 Helical gear 6 Sliding bearing 7 Thrust needle bearing 8 Cylindrical roller bearing 10 Outer ring 12 Outer ring rod 20 Inner ring 22 Inner ring rod 30 Cylindrical roller

Claims (4)

A rotating shaft having a helical gear;
A plurality of bearings respectively supporting the rotating shaft on both sides in the axial direction of the helical gear;
A gear support bearing device comprising:
The plurality of bearings include a plain bearing on one side in the axial direction of the helical gear and a cylindrical roller bearing on the other side in the axial direction. The outer ring and the inner ring of the cylindrical roller bearing are each provided with at least one flange part,
2. The gear supporting bearing device according to claim 1, wherein the flange portion of the outer ring and the inner ring supports an axial load acting on the rotating shaft toward the other side in the axial direction.   The cylindrical roller bearing supports a radial load during driving of the vehicle and supports the axial load by the flange in addition to the radial load during coasting of the vehicle. The gear support bearing device according to claim.   The gear support bearing device according to claim 3, wherein the plurality of bearings further include a thrust needle bearing that supports the axial load when the vehicle is driven on one side in the axial direction.

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