JP2003336724A - Bearing support device for transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize distance between bearings of two rotary shafts disposed on the same rotation axis, and to realize light weight and compactness of a transmission. <P>SOLUTION: An engine side end part of a secondary shaft 9c is journaled through a first needle bearing 39 supported by a first bearing support part 38a of a bearing support member 38. An output shaft 13 of a continuously variable transmission 9 is inserted into the secondary shaft 9c, and a reduction gear shaft 15 is connected to the engine side end part. A counter-engine side end part of the reduction gear shaft 15 is journaled through a second needle bearing 41, supported by a second bearing support part 38b of the bearing support member 38, and having larger inner diameter than outer diameter of the first needle bearing 39. The second bearing support part 38b of the bearing support member 38 is formed at such a position that the second needle bearing 41 is supported to be overlapped with the first needle bearing 39 on the outer side of the first needle bearing 39. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing support device for a transmission, which supports bearings of two rotary shafts arranged on the same rotary shaft.

[0002]

2. Description of the Related Art Conventionally, in many transmissions such as continuously variable transmissions and automatic transmissions, rotary shafts that are rotated at different rotational speeds are arranged on the same rotary shaft. For example, as shown in FIG. 3, the first rotating shaft 51 and the second rotating shaft 52 are disposed at one end of the first rotating shaft 51 and the second rotating shaft 52.
One end portion of the rotary shaft 52 is provided so as to face each other, and they are arranged on the same rotary shaft. Then, one end side of the first rotating shaft 51 is pivotally supported by the casing 54 or the like via the first bearing 53, and one end side of the second rotating shaft 52 is the second side.
It is rotatably supported by the casing 54 and the like via a bearing 55.

[0003]

However, in such a conventional structure, since the first bearing 53 and the second bearing 55 are arranged, the second bearing from the end of the first bearing 53 is disposed. There is a problem that the dimension up to the end of 55 (L in the drawing) becomes long, and the length of the entire transmission becomes long. Due to the problem of lengthening of the bearings, the length of other parts such as the casing and other rotating shafts must be increased, which impedes reduction in weight and size of the transmission. is there.

The present invention has been made in view of the above circumstances. The distance between bearings of two rotary shafts arranged on the same rotary shaft is shortened as much as possible, and the transmission is made lighter and smaller. It is an object of the present invention to provide a bearing support device for a transmission that can be used.

[0005]

In order to achieve the above-mentioned object, a bearing support device for a transmission according to the present invention according to claim 1 is provided with a first rotating shaft and a same rotating shaft as the first rotating shaft. A second rotating shaft provided, a first bearing supporting one end side of the first rotating shaft, and a second bearing supporting the second rotating shaft near the first bearing. And a first bearing support portion for supporting the first bearing, the inner diameter of the second bearing being larger than the outer diameter of the first bearing. And a second bearing support portion that supports the second bearing by being overlapped with the first bearing outside the first bearing.

A bearing support device for a transmission according to a second aspect of the present invention is the bearing support device for a transmission according to the first aspect, wherein the transmission is a continuously variable transmission. .

That is, in the bearing support device of the transmission according to the first aspect of the present invention, the inner diameter of the second bearing is formed to be larger than the outer diameter of the first bearing, and the second bearing is of the first bearing. Since it is supported on the outside so as to overlap with the first bearing, the dimension from the end of the first bearing to the end of the second bearing can be shortened, and the transmission can be made lighter and smaller. Becomes Then, as the transmission, specifically, the continuously variable transmission is adopted as described in claim 2.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram showing a power transmission system of a continuously variable transmission, and FIG. 2 is a cross-sectional view of a bearing support member and its vicinity.

In FIG. 1, reference numeral 1 indicates an engine,
An output shaft 2 of the engine 1 is connected to a drive shaft 6 which supports a drive wheel 5 via a continuously variable transmission portion 3 and a final reduction gear portion 4 which constitute a continuously variable transmission.

The continuously variable transmission unit 3 is mainly composed of a torque converter 7, a forward / reverse switching device 8, and a continuously variable transmission 9 as an example of a transmission from the input side. The turbine 7b of the torque converter 7 is connected to the impeller 7a of the converter 7, and the turbine 7b of the forward / reverse switching device 8 is connected to the planetary input shaft 8a.

The forward / reverse switching device 8 includes a planetary gear 10
When the forward clutch 11 and the reverse brake 12 are both open, the neutral state is established. Further, when only the forward clutch 11 is engaged, the planetary gear 10 integrally rotates, and the power from the turbine 7b of the torque converter 7 is transmitted to the continuously variable transmission 9 as it is.

On the other hand, the forward clutch 11 is released,
When the reverse brake 12 is engaged, the power from the turbine 7b of the torque converter 7 is transmitted to the continuously variable transmission 9 via the planetary gear 10 in a reversed state.

A primary pulley 9b is mounted on the primary shaft 9a of the continuously variable transmission 9, and the primary shaft 9a
A secondary pulley 9d is axially mounted on a hollow secondary shaft 9c provided in parallel with a so as to face the primary pulley 9b. A drive belt 9e is wound around the pulleys 9b and 9d. The secondary shaft 9c is provided as a first rotating shaft.

Further, on the side of each movable sheave (primary sheave 9f, secondary sheave 9g) of each pulley 9b, 9d, there is a hydraulic chamber (primary hydraulic chamber 9).
h, a secondary hydraulic chamber 9i) is formed, and the shift pressure is controlled by changing the groove widths of the pulleys 9b and 9d by the operating pressure supplied to the hydraulic chambers 9h and 9i.

Further, the output shaft 13 from the continuously variable transmission 9 is inserted into the hollow secondary shaft 9c of the continuously variable transmission 9, and the end portion of the output shaft 13 on the side opposite to the engine is output. It is connected to the secondary shaft 9c via the clutch 14. A reduction gear shaft 15 as a second rotating shaft is connected to the end of the output shaft 13 on the engine side by spline fitting. The reduction drive gear 16 provided on the reduction gear shaft 15 extends from the drive pinion shaft. The driving force is transmitted to the final gear 20 via the reduction driven gear 18 and the drive pinion 19 of 17, and the driving force is transmitted to the differential device 21 mounted on the drive shaft 6.

The output clutch 14 is normally in a connected state, and is opened to prevent damage to the drive belt 9e when a large load is applied to the drive belt 9e, such as during sudden braking, and to stop the vehicle suddenly. When the vehicle is stopped, the downshift control of the continuously variable transmission 9 can be performed when the vehicle is stopped, and good restartability can be obtained.

Further, a control valve unit for controlling an operating pressure necessary for gear ratio control, transmission torque control, etc. of the continuously variable transmission portion 3 is arranged in an oil pan provided at the bottom of the engine 1. This control valve unit controls the oil supply pressure with the discharge pressure from a gear pump (the oil control system is not shown) as the original pressure.
In the figure, reference numerals 25 and 26 are sprockets and chains for driving the above-described gear pump.

Next, the supporting portions of the hollow secondary shaft 9c, the output shaft 13, and the reduction gear shaft 15 of the continuously variable transmission 9 will be described in more detail with reference to FIG. Continuously variable transmission 9
A secondary sheave 9g of a secondary pulley 9d is slidably provided on the outer periphery of the hollow secondary shaft 9c along the secondary shaft 9c. An outer edge side of the secondary sheave 9g is formed as a cylinder 31 extending toward the engine-side shaft end of the secondary shaft 9c in parallel with the axial direction. Then, the tip of the plunger 34, which is fixedly mounted on the outer periphery of the secondary shaft 9c with the washer 32 and the lock nut 33 and extends obliquely in a stepwise manner toward the secondary sheave 9g, has a cylinder 3 of the secondary sheave 9g.
The secondary hydraulic chamber 9i is formed by being slidably contacted with the inner surface of 1. The secondary hydraulic chamber 9i is provided with a spring 35 that constantly urges the secondary sheave 9g and the plunger 34 away from each other (direction in which the secondary hydraulic chamber 9i increases). In addition, the secondary sheave 9
A balance chamber 36 is fixed to the end of the g cylinder 31 so as to cover the surface of the plunger 34 on the engine side.

The end of the secondary shaft 9c on the side opposite to the engine is pivotally supported by a side case (not shown) via a ball bearing 37. The end of the secondary shaft 9c on the engine side is provided with a shaft via a first needle bearing 39 as a first bearing supported by a first bearing support portion 38a of a bearing support member 38 as a bearing support device. The bearing support member 38 is supported and bolted to the transmission case 40.

The output shaft 13 from the continuously variable transmission 9 is provided so as to pass through the inside of the secondary shaft 9c.
The reduction drive gear 1
6 is connected to the reduction gear shaft 15 formed on the outer periphery by spline fitting.

The end portion of the reduction gear shaft 15 on the side opposite to the engine is provided with a second bearing support portion 38 of the bearing support member 38.
It is supported by b via a second needle bearing 41, which is supported by b and has an inner diameter larger than the outer diameter of the first needle bearing 39 as a second bearing.
Further, the end of the reduction gear shaft 15 on the engine side is
A converter case 4 mounted on the engine side of the transmission case 40 via a ball bearing 42.
3 is pivotally supported.

Here, the second bearing support portion 38b of the bearing support member 38 has the second needle bearing 41,
It is formed outside the first needle bearing 39 and at a position overlapping and supporting the first needle bearing 39. Therefore, the first needle bearing 3
The dimension from the end of 9 to the end of the second needle bearing 41 is shortened and formed, and by this shortened length,
It is possible to reduce the length of other parts such as the casing and other rotary shafts, and thus the weight reduction and downsizing of the transmission are realized. In the present embodiment, the continuously variable transmission is described as an example, but the present invention is not limited to this, and it goes without saying that it can be applied to a normal automatic transmission and the like.

[0023]

As described above, according to the present invention,
It is possible to reduce the distance between the bearings of the two rotary shafts arranged on the same rotary shaft as much as possible, and to realize the weight reduction and downsizing of the transmission.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a power transmission system of a continuously variable transmission.

FIG. 2 is a cross-sectional view of a bearing support member and a main part in the vicinity thereof.

FIG. 3 is an explanatory view showing an example of two conventional rotary shafts that are arranged to face each other on the same rotary shaft.

[Explanation of symbols]

1 engine 9 continuously variable transmission 9b Primary pulley 9c Secondary shaft (first rotating shaft) 9d secondary pulley 9e drive belt 13 Output shaft 14 Output clutch 15 Reduction gear shaft (second rotary shaft) 38 Bearing support member (bearing support device) 38a First bearing support portion 38b Second bearing support portion 39 First Needle Bearing (First Bearing) 41 Second Needle Bearing (Second Bearing)

Claims (2)

[Claims] 1. A first rotary shaft, a second rotary shaft arranged on the same rotary shaft as the first rotary shaft, and a first rotary shaft supporting one end portion side of the first rotary shaft. A bearing supporting device for a transmission, comprising: a bearing; and a second bearing supporting the second rotating shaft near the first bearing, wherein an inner diameter of the second bearing is equal to that of the first bearing. A first bearing support portion formed to have a diameter larger than an outer diameter and supporting the first bearing, and an outer side of the first bearing that overlaps the first bearing and supports the second bearing. A bearing support device for a transmission, comprising: 2. The bearing support device for a transmission according to claim 1, wherein the transmission is a continuously variable transmission.