JPH04249647A - Hydraulic controller for continuously variable transmission - Google Patents

Abstract

PURPOSE:To secure the operation of a ratio pressure control valve in a valve body by arranging the valve above the axis center linem of a rotary shaft and preventing the valve from being immersed in oil, in the constitution in which the valve body is arranged on one edge side of the rotary shaft. CONSTITUTION:A valve mechanism for hydraulic control which is built in a valve body 142 installed on a left case wall part 16 of the left case 10 of the transmission case 6 of a continuously variable transmission 4 is equipped with the valve means such as a line pressure control valve, ratio pressure control valve 70, manual shift valve, and a solenoid regulator valve, and the radius of the revolution of a belt, i.e., gear ratio is varied by controlling the supply and discharge of the hydraulic pressure for the drive side hydraulic chamber and the driven side hydraulic chamber of the transmission. In this case, a ratio pressure control valve 70 for acting a ratio pressure to the drive side hydraulic chamber is installed on the valve body 42 at the position of height H from the axis center line C of the drive side shaft 20. Accordingly, the always proper ratio pressure can be applied to a drive side pulley 18.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a hydraulic control device for a continuously variable transmission, and more particularly, to a hydraulic control device for a continuously variable transmission that can properly control the continuously variable transmission by reliably operating a ratio pressure control valve. Regarding.

0002

2. Description of the Related Art Vehicles such as automobiles are equipped with a transmission in order to appropriately extract the driving force generated by an internal combustion engine depending on the driving conditions. In a transmission, the driver manually adjusts the driving force of the internal combustion engine to the required gear ratio (
There are manual transmissions that convert the driving force into a belt ratio (belt ratio) and take it out, and automatic transmissions (continuously variable transmissions) that automatically and steplessly convert and take out the driving force of the internal combustion engine according to the driving condition according to the required gear ratio.

As shown in FIG. 5, the continuously variable transmission 202 includes a drive-side pulley (primary pulley) 208 provided with a drive-side shaft (primary shaft) 206 that is a rotating shaft rotated by an internal combustion engine 204; A driven pulley (secondary pulley) 214 is provided with a driven shaft (secondary shaft) 212 that is rotated via a belt 210 by rotation of the driving pulley 208 .

An oil pump 2 is provided at one end of the drive shaft 206 and is driven by the rotation of the drive shaft 206.
16 are provided.

[0005] Further, on the other end side of the drive-side shaft 206, a valve body 218 equipped with various hydraulic control valves is attached to a left case 220 that is a part of the transmission case.

The valve body 218 is provided with a ratio pressure control valve (not shown) as one of the hydraulic control valves that applies a ratio pressure (primary pressure) to the drive pulley 208.

[0007] Further, such a hydraulic control device for a continuously variable transmission is disclosed in, for example, Japanese Utility Model Application Publication No. 2-91246. The belt described in this publication is attached to the outside of both pulley shafts in order to enable attachment/detachment work to the case part while the belt is wrapped around the driving pulley and driven pulley of a continuously variable transmission for vehicles. By providing each female screw portion, the workability of attaching and detaching is improved.

[0008]

[Problem to be Solved by the Invention] However, since the operation of the ratio pressure control valve provided in the valve body is controlled by a duty solenoid, when the ratio pressure control valve is arranged below the drive side shaft, , the ratio pressure control valve is immersed in oil, and as a result, the ratio pressure control valve does not operate properly at low temperatures, resulting in the inconvenience of not being able to accurately control the hydraulic pressure of the continuously variable transmission. there were.

[0009]

[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides an oil pump driven by the rotation of a rotating shaft, and includes various hydraulic control valves at one end of the rotating shaft. In a hydraulic control device for a continuously variable transmission, the valve body is provided with a ratio pressure control valve that applies a ratio pressure to a driving pulley, and the ratio pressure control valve is located from the axis of the rotating shaft. The valve body is also provided with a valve located above the valve body.

0010

[Operation] According to the structure of the present invention, since the ratio pressure control valve is located above the rotating shaft, the ratio pressure control valve is not immersed in oil. can be operated reliably and the hydraulic control of the continuously variable transmission can be performed appropriately.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail and specifically below with reference to the drawings.

FIGS. 1 to 4 show embodiments of the invention. In FIG. 3, 2 is an internal combustion engine mounted on a vehicle, 4 is a continuously variable transmission, and 6 is a transmission case. The continuously variable transmission 4 converts and extracts the driving force from the internal combustion engine 2 that continuously changes the gear ratio as required, and is hydraulically controlled.

The transmission case 6 includes a right case 8 on the internal combustion engine 2 side and a left case 1 on the side away from the internal combustion engine 2.
0 and a side cover 12 attached to this left case 10.

[0014] The right case 8 and the left case 10
A right case wall portion 14 and a left case wall portion 16 are respectively provided upright. On the right case wall 14 and left case wall 16, which are erected, there is a drive side shaft (primary shaft) 20, which is the rotation axis of the drive side pulley (primary pulley) 18, and a driven side pulley (secondary pulley) 22. A driven side shaft (secondary shaft) 24 is rotatably held.

The drive-side pulley 18 includes a drive-side fixed pulley piece 26 fixed to the drive-side shaft 20 and a drive-side movable pulley piece 28 mounted on the drive-side shaft 20 so as to be movable in the axial direction but not rotatable. It consists of.

The driven pulley 22 also has a driven shaft 24.
The driven side fixed pulley piece 30 and the driven side shaft 24 fixed to
It consists of a driven side movable pulley piece 32 which is mounted so as to be movable in the axial direction but not rotatable.

A belt 34 is wound between the driving pulley piece 18 and the driven pulley 22.

A driving side housing 36 and a driven side housing 38 are attached to the driving side movable pulley piece 28 and the driven side movable pulley piece 32, respectively, and a driving side hydraulic chamber 40 and a driven side hydraulic chamber 42 are formed, respectively. ing.

Further, the driven side hydraulic chamber 42 is provided with a spring 44 that biases the driven side housing 38 in a direction to expand the driven side hydraulic chamber 42.

An oil pump 46 driven by a drive shaft 20 is mounted on the side of the light case wall 14 of the light case 8 that is remote from the internal combustion engine 2.

The oil pump 46 is driven by the internal combustion engine 2 and pumps oil used in the lubrication system and control system.

The continuously variable transmission 4 is provided with a starting clutch 48 on the output end side of the driven shaft 24.

The starting clutch 48 is controlled in its engagement and disengagement state by the hydraulic pressure acting on the clutch hydraulic chamber 50, and transfers the driving force output from the continuously variable transmission 4 to the output rotatably fitted on the driven side shaft 24. It is connected to the shaft 52 intermittently.

The oil pumped by the oil pump 46 is supplied to a hydraulic control device 54, as shown in FIG.

This hydraulic control device 54 is provided with the oil pump 46. This oil pump 46 is
It sucks oil in an oil pan (not shown) and sends this oil to the line pressure passage 56 to apply line pressure to the driven pulley 22.

An oil strainer 58 is provided between the oil pan and the oil pump 46 to filter oil.

The line pressure passage 56 includes a first oil passage 60.
The first line pressure control valve 62 is connected through the second line pressure control valve 62, the second line pressure control valve 66 is connected through the second oil passage 64, and the third line pressure control valve 66 is connected through the second oil passage 64.
A ratio pressure control valve 70 is connected via an oil passage 68, and a fourth
A clutch pressure control valve 74 is connected through an oil passage 72 , a manual shift valve 78 is connected through a fifth oil passage 76 , and a solenoid regulator valve 82 is connected through a sixth oil passage 80 .
is connected to the relief valve 8 via the seventh oil passage 84.
6 have been contacted.

The first line pressure control valve 62 and the second line pressure control valve 66 are communicated by an eighth oil passage 88.

A ninth oil passage 92 provided with a line solenoid 90 is connected to the first line pressure control valve 62 .

Further, a tenth oil passage 96 in which a ratio solenoid 94 is provided is connected to the ratio pressure control valve 70.

[0031] The ninth oil passage 92 and the tenth oil passage 96 are connected at a connecting portion 98.

The ratio pressure control valve 70 communicates with the drive pulley 18 via a ratio pressure passage 100.

[0033] An eleventh oil passage 104 communicating with the cooling control valve 102 is connected in the middle of the ratio pressure passage 100.

This cooling control valve 102 has a twelfth
An oil cooler 108 is connected through an oil passage 106, and the clutch pressure control valve 74 is connected through a thirteenth passage 110 on which clutch pressure acts.
12 to the hydraulic starting clutch 48. A fourteenth oil passage 114 communicating with the manual shift valve 78 is connected to the middle of the thirteenth passage 110.

A clutch solenoid 118 is connected to the clutch pressure control valve 74 via a fifteenth oil passage 116.

The starting clutch 48 has a first
It is connected to a shift servo valve 122 via an oil passage 120.

The shift servo valve 122 includes a servo cylinder 124, a servo piston 126 that moves within the servo cylinder 124, a shift servo rod 128 fixed to the servo piston 126, and a shift servo rod 128 fixed to the shift servo rod 128. and a shift fork 130 that operates a forward/reverse switching mechanism (not shown).

A seventeenth oil passage 132 communicating with the clutch solenoid 118 is connected to a connecting portion 98 between the ninth oil passage 92 and the tenth oil passage 96 .

The 17th oil passage 132 is connected to an 18th oil passage 134 that communicates with the ratio pressure control valve 70 and a 19th oil passage 136 that communicates with the first line pressure control valve 62.

A lube pressure passage 138 is connected between the oil pump 46 and the second line pressure control valve 66. A lube pressure regulator valve 140 is interposed in the middle of this lube pressure passage 138.

The line solenoid 90, ratio solenoid 94, and clutch solenoid 118 are connected to the continuously variable transmission 2.
The control means (ECU) (not shown) is connected to the control means, and each operation is controlled by this control means.

As shown in FIGS. 1 and 2, the ratio pressure control valve 70 is located at a height H above the axis C of the drive shaft 20, which is the rotation shaft on which the oil pump 46 is installed. It is provided in the valve body 142.

The valve body 142 is provided with various hydraulic control valves such as the ratio pressure control valve 70 of the hydraulic control device 54.

Further, as shown in FIG. 3, this valve body 142 is connected to the left case 10 at the other end of the drive side shaft 20.
It is attached to the left case wall portion 16 of the left case.

Next, the operation of this embodiment will be explained.

When the internal combustion engine 2 operates and the drive shaft 20 rotates, the oil pump 46 is driven and a line pressure is generated in the hydraulic control device 54.

This line pressure also acts on the ratio pressure control valve 70 side, and this ratio pressure control valve 70 acts on the ratio solenoid 9.
4, the ratio pressure (primary pressure) to the drive pulley 18 is controlled.

As shown in FIGS. 1 and 2, the ratio pressure control valve 70 is attached to the valve body 142 at a height H above the axis C of the drive shaft 20. This results in
Because the ratio pressure control valve 70 is not immersed in oil, the ratio solenoid 94 allows the ratio pressure control valve 70 to
operates reliably, so that an appropriate ratio pressure can be applied to the drive pulley 18 to appropriately control the continuously variable transmission 2.

Furthermore, in the valve body 142, the ratio pressure control valve 70 can be easily positioned above the drive-side shaft 20, eliminating the need for additional parts and simplifying the configuration. Therefore, it can be made light in weight and inexpensive.

[0050]

Effects of the Invention As is clear from the above detailed description, according to the present invention, by locating the ratio pressure control valve above the rotating shaft on which the oil pump is installed, the ratio pressure control valve is immersed in oil. Therefore, the ratio pressure control valve can be operated reliably and the continuously variable transmission can be properly controlled. In addition, since the installation position of the ratio pressure control valve is simply changed in the valve body, there is no need to make major changes to other parts, no additional parts are required, an increase in weight, etc. can be prevented, and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a left side view of a valve body.

FIG. 2 is a right side view of the valve body.

FIG. 3 is a sectional view of the continuously variable transmission.

FIG. 4 is a hydraulic circuit diagram of a hydraulic control device for a continuously variable transmission.

FIG. 5 is a cross-sectional view of a conventional continuously variable transmission.

[Explanation of symbols]

2 Internal combustion engine 4 Continuously variable transmission 18 Drive side pulley 20 Drive side shaft 22 Driven pulley 24 Driven side shaft 34 Belt 46 Oil pump 54 Hydraulic control device 70 Ratio pressure control valve 142 Valve body

Claims (1)

[Claims] Claim 1: An oil pump driven by the rotation of a rotary shaft is provided, a valve body provided with various hydraulic control valves is provided on one end side of the rotary shaft, and the valve body has a ratio pressure applied to a driving pulley. A hydraulic control device for a continuously variable transmission provided with a ratio pressure control valve, characterized in that the ratio pressure control valve is provided in the valve body above an axial center line of the rotating shaft. Transmission hydraulic control device.