JP2003301929A - Mounting structure of chain-driven oil pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a chain-driven oil pump improving the mounting operability and mounting precision. <P>SOLUTION: A first bearing portion 75 supporting a drive sprocket 70 and a second bearing portion 78 supporting a driven sprocket 71 are placed on a body case 20, and a directly-mounted chain system 36 is configured on the case 20, which enables the mounting operation of the chain system to be operated separately from a pump 33 or the like. Accordingly, the mounting precision for the system 36, the pump body 33 and the like can be managed separately, and the mounting operability and mounting precision of the chain-driven oil pump are improved. <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 chain drive type oil pump mounting structure for transmitting a driving force transmitted to a drive sprocket to a pump body via a chain.

[0002]

2. Description of the Related Art Conventionally, as an oil pump for supplying lubricating oil, hydraulic oil, etc. to various parts of an automatic transmission, etc., an engine driving force transmitted from a starting device such as a torque converter is input to a pump via a chain. There is a chain drive system that transmits to the shaft. Such a chain drive type oil pump has more flexibility in the mounting position of the pump body, compared to a structure in which the pump body is mounted coaxially with the output shaft of the starting device. If it is provided in the oil pan and integrated with the hydraulic control valve unit, the controllability of the hydraulic oil can be improved.

As a mounting structure for this type of oil pump,
For example, in Japanese Patent No. 3005528, a chain for transmitting a driving force to the pump main body by providing sprockets on the input shaft and the pump main body supported on the transmission housing side, and chaining the chains between these sprockets. Techniques for configuring the system are disclosed.

[0004]

By the way, in a chain drive type oil pump, in order to improve quietness, it is required to mount the chain system to an automatic transmission or the like with high accuracy. However, the above-mentioned patent No. 30055
In the technique disclosed in Japanese Patent No. 28, the mounting accuracy of the pump body and the input shaft also strongly affects the mounting accuracy of the chain system. Therefore, in order to improve quietness, the above-mentioned respective members are mounted. It is necessary to improve the accuracy as a whole, which may lead to a decrease in workability in mounting.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a chain drive type oil pump mounting structure capable of improving mounting workability and mounting accuracy.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 has a chain system for transmitting the driving force transmitted to the drive sprocket to the driven sprocket through the chain. In a mounting structure for a chain drive type oil pump that drives a pump body via a system, a first support portion that supports the drive sprocket and a second support portion that supports the driven sprocket are placed on the same case. It is characterized in that a chain system is provided and directly attached to the case.

The invention according to claim 2 is the invention according to claim 1, wherein the chain system is provided in a main body case on the starting device side of an automatic transmission having a starting device on the input side. The drive sprocket of the chain system is rotatably supported by the first support portion concentric with the output shaft of the starting device, and is axially movable by a support center fixed to the main body case. A hollow connecting shaft that is restricted and extends from the starting device along the outer periphery of the output shaft is rotationally engaged with the inner diameter portion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The drawings relate to one embodiment of the present invention, FIG. 1 is an exploded perspective view of an oil pump, FIG. 2 is a sectional view showing an essential part of an automatic transmission in a developed manner, and FIG. 3 is a schematic configuration of the automatic transmission. It is a skeleton diagram shown.

First, as an example of a device to which the present invention is applied, a schematic structure of an automatic transmission 1 incorporating a continuously variable transmission 2 will be described with reference to FIG. As shown in the figure, the automatic transmission 1 is provided with a forward / reverse switching device 3 and a starting device 4 on the input side of a continuously variable transmission 2, and the essential parts thereof are configured.
An engine 10 is connected to the input side of the starting device 4.

The starting device 4 is constructed to have a main body case 20 as a case, and inside the main body case 20,
A drive plate 21 connected to the crankshaft 11 of the engine 10 is provided. A torque converter case 23 of a torque converter 22 is fixed to the drive plate 21, and a pump impeller 24 is connected to the torque converter case 23. A turbine runner 25 is connected to the pump impeller 24 via a fluid, and a torque converter output shaft 26 connected to the turbine runner 25 extends to the forward / reverse switching device 3 side.

The torque converter case 23 is provided with a lock-up clutch 27 which is connected to the turbine runner 25. When the lockup clutch 27 engages with the torque converter case 23, the driving force of the engine 10 does not pass through the torque converter 22 and the turbine runner 25
A lockup state is achieved in which the torque converter is directly transmitted to the torque converter output shaft 26 via.

A stator 28 for rectifying the fluid of the torque converter 22 is disposed between the pump impeller 24 and the turbine runner 25, and the stator 28 is supported by a stator shaft 30 via a one-way clutch 29. There is. Here, the stator shaft 30 is composed of a hollow member extending from a support center 31 fixedly provided on the output side of the main body case 20, and internally supports the torque converter output shaft 26.

An oil pan 32 is attached to the lower portion of the main body case 20 on the output side. Inside the oil pan 32, a pump body 33 of the oil pump is integrally provided with a hydraulic control valve unit 34. A pump input shaft 35 extends from the pump body 33.
To the torque converter 2 via the chain system 36.
Two pump impellers 24 are connected in series. Note that FIG.
Is a developed view, the oil pan 32 is shown in the upper part of the drawing.

The forward / reverse switching device 3 includes a torque converter 2
2 for transmitting power between the torque converter output shaft 26 extended from the turbine runner 25 of FIG. 2 and the pulley input shaft 51 extending from the primary pulley 50 of the continuously variable transmission 2, and the main body case of the starting device 4. A main body case 40 connected to 20 includes a forward clutch portion 41, a planetary gear 42, and a reverse brake portion 43.

The continuously variable transmission 2 has a primary pulley 50, a secondary pulley 52 that opposes the primary pulley 50, and a belt 53 that connects the two pulleys 50, 52 to each other. The pulley output shaft 54 that supports the
Via a drive shaft 62 for the front wheels or the rear wheels.

Further, the primary pulley 50 is provided with a primary hydraulic chamber 55 for varying its groove width, while the secondary pulley 52 is provided with a secondary hydraulic chamber 56 for varying its groove width. . In the continuously variable transmission 2, the secondary hydraulic pressure supplied to the secondary hydraulic chamber 56 applies tension required for torque transmission to the secondary pulley 52, and the primary hydraulic pressure supplied to the primary hydraulic chamber 55 changes the gear ratio. Is set. The primary hydraulic pressure and the secondary hydraulic pressure are set in a transmission control device (not shown) based on the engine operating state and the like, and are controlled through the hydraulic control valve unit 34.

As shown in FIGS. 1 and 2, the chain system 36 includes a drive sprocket 70 and a driven sprocket 71 which are rotatably supported by the main body case 20 of the starting device 4, and these sprocket 70, 71 are connected in series. The main part is configured by including a chain 73 that operates.

More specifically, as shown in FIG.
On the main body case 20, a first bearing portion 75 as a first support portion is opened concentrically with the torque converter output shaft 26. The drive sprocket 70 has a hollow shaft portion 76.
Is formed to project, and the outer circumference of the shaft portion 76 is rotatably supported by the inner circumference of the first bearing portion 75 via a bearing. At this time, the end face of the support center 31 on the engine 10 side is brought into contact with the drive sprocket 70, whereby the axial movement of the drive sprocket 70 is restricted. A hollow connecting shaft 77 is extended from the pump impeller 24 along the outer circumference of the stator shaft 30, and the outer circumference of the connecting shaft 77 is spline-fitted to the inner circumference of the shaft portion 76. The engine driving force is transmitted to.

The body case 20 also includes an oil pan 3
A second bearing portion 78 serving as a second support portion is provided in the vicinity of 2. A hollow shaft portion 79 is formed on the driven sprocket 71 so as to project therefrom, and the outer periphery of the shaft portion 79 is rotatably supported by a second bearing portion 78 via a bearing. Further, the pump input shaft 35 extending from the pump body 33 is spline-fitted to the inner periphery of the shaft portion 79, whereby the drive sprocket 70 to the chain 73.
The engine driving force transmitted to the driven sprocket 71 via the is transmitted to the pump body 33. The driven sprocket 71 is prevented from coming off by a snap ring provided on the outer periphery of the shaft portion 79 being hooked on a bearing.

In this embodiment, the pump body 33
Is composed of an external tooth type pump main body, and has a first pump gear 80 connected to the pump input shaft 35 and a second pump gear 81 meshing with the first pump gear 80. Is rotatably supported by cover plates 83 and 84 that close both sides of the pump case 82 to form a main part. Here, both cover plates 83, 84
With a plurality of bolts 8 sandwiching the pump case 82.
They are connected to each other via 5. In this case,
The tip of some of the bolts 85 penetrates the hydraulic control valve unit 34 and is screwed into the main body case 40, whereby the pump main body 33 is fastened and fixed to the main body case 40 together with the hydraulic control valve unit 34. .

Next, the procedure for assembling the oil pump and its peripheral members in the automatic transmission 1 having the above-described structure will be described. First, the body case 20 of the starting device 4
On the other hand, a driven sprocket 71 is attached.
That is, the driven sprocket 7 is attached to the second bearing portion 78.
One shaft portion 79 is rotatably supported.

Thereafter, the chain 73 is slackened while being hung on the drive sprocket 70 while being hung on the driven sprocket 71.

With the chain 73 hanging on the drive sprocket 70 and the driven sprocket 71, the shaft portion 76 of the drive sprocket 70 is attached to the first bearing portion 75.
Is rotatably assembled.

Next, the support center 3 is attached to the main body case 20.
1 is attached, the drive sprocket 70
Is axially positioned and is concentrically assembled with the torque converter output shaft 26.

By assembling in this way, as shown in FIG. 1, the chain system 3 directly attached to the main body case 20.
6 is configured.

After that, the pump input shaft 3 of the pump body 33
The pump body 33 is connected to the chain system 36 by spline-fitting the shaft portion 5 of the driven sprocket 71. Here, in the present embodiment, the pump main body 33 is assembled in advance to the main body case 40 of the forward / reverse switching device 3 together with the hydraulic control valve unit 34, and is connected to the chain system 36 when the main body case 20 and the main body case 40 are connected. Be connected. At that time, each member such as the reverse brake portion 43, the planetary gear 42, the forward clutch portion 41, and the torque converter output shaft 26 is attached to the main body case 40.
When 0 and 40 are connected, the torque converter output shaft 26 penetrates the stator shaft 30 and is spline-fitted to the turbine runner 25.

According to such an embodiment, the first bearing portion 75 that supports the drive sprocket 70 and the second bearing portion 78 that supports the driven sprocket 71 are provided on the body case 20, and the body case 20 is provided. By constructing the chain system 36 directly attached on the 20, the mounting work of the chain system can be performed separately from the pump main body 33 and the like, and furthermore, the mounting precision and the like of these can be managed individually. It is possible to improve the mounting workability and mounting accuracy of the chain drive type oil pump.

Further, by directly mounting the chain system 36 on the main body case 20, it is possible to individually evaluate the noise and the like generated between the chain system 36 and the pump main body 33 at the time of designing or assembling. Therefore, it is possible to easily and effectively tune the noise of the oil pump.

Further, in the automatic transmission 1 using the torque converter 22 and the like in the starting device 4 as described above, the drive sprocket 70 is concentric with the torque converter output shaft 26 and the bearing portion (first bearing) of the main body case 20. Part 75)
Since it is configured to be supported and removed by the support center 31, the positioning accuracy of the drive sprocket 70 in the axial direction of the main body case 20 is improved, and the quietness of the chain 73 is improved. Further, the work of assembling the chain 73 around the sprockets 70 and 71 becomes easy.

[0030]

As described above, according to the present invention, the first supporting portion for supporting the drive sprocket and the second supporting portion for supporting the driven sprocket are provided on the same case. By constructing the chain system directly attached to, it is possible to improve the mounting workability and the mounting accuracy of the chain drive type oil pump.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an oil pump

FIG. 2 is a cross-sectional view showing a main part of an automatic transmission in a developed manner.

FIG. 3 is a skeleton diagram showing a schematic configuration of an automatic transmission by expanding it.

[Explanation of symbols]

4 Starting device 20 Body case (case) 26 Torque converter output shaft (start device output shaft) 31 Support Center 33 Pump body 35 Pump input shaft 36 chain system 70 drive sprocket 71 Driven Sprocket 73 chains 75 First Bearing (First Support) 77 Connection shaft 78 Second bearing portion (second support portion)

Claims (2)

[Claims] 1. A mounting structure for a chain drive type oil pump, comprising a chain system for transmitting a driving force transmitted to a drive sprocket to a driven sprocket via a chain, and driving a pump body via the chain system. A first support portion that supports the drive sprocket and a second support portion that supports the driven sprocket are provided on the same case, and a chain system directly attached to the case is configured. Oil pump mounting structure. 2. The chain system is provided in a main body case on the starting device side of an automatic transmission having a starting device on the input side, and the drive sprocket of the chain system is provided with an output shaft of the starting device. The support center is rotatably supported by the concentric first support portion, and its movement in the axial direction is restricted by a support center fixed to the body case, and extends from the starting device along the outer circumference of the output shaft. 2. The mounting structure for a chain drive type oil pump according to claim 1, wherein the hollow connecting shaft that is taken out is rotatably engaged with the inner diameter portion.