JPH0798049A - Control valve unit of continuously variable transmission - Google Patents

Abstract

PURPOSE:To receive a control valve unit in a narrow space in the vertical direction of a transmission by forming a recessed part for receiving valve body in one part of a transmission case, and directly fitting the almost half part of a lower valve body to the case. CONSTITUTION:High pressure oil is supplied from an oil pump as an oil pressure source to a lower valve body 72 through the inlet port of a case 100, and the pressure is adjusted by means of a pressure regulator valve 84 into the line pressure. This line pressure is supplied to a power transmission mechanism 60 in an upper chamber 110a through the line pressure oil passage of the case 100 and the like. At this time, because an upper valve body 74 is provided with only a low pressure valve and not provided with a high pressure valve, the upper valve body 74 can be formed into a small size. Consequently, the upper valve body 74 can be received in a recessed part 110b adjacent to a passage formed part 100a. Hereby, the ground clearance at loading it on a vehicle can be sufficiently insured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve unit for a continuously variable transmission.

[0002]

2. Description of the Related Art As a conventional control valve unit for a transmission, there is one disclosed in Japanese Patent Laid-Open No. 254058/1992. As shown in FIG. 5, the control valve unit of the transmission shown in FIG. 5 has an upper valve body 450, an intermediate valve body 452, and a lower valve body 454, in which each valve body projects to the left in the drawing in the oil pan 456. The case 458 is also shaped to project to the left in the figure in correspondence with this. This is configured such that the high pressure for control of the transmission passes through all of the upper valve body 450, the intermediate valve body 452, and the lower valve body 454, and in order to secure the strength of the valve body, the gap between the high pressure oil grooves should be wide. This is because the dimension in the longitudinal direction becomes large in order to keep it. A high pressure oil passage 460 and a low pressure oil passage 462 are formed in the case 458. With this configuration, the hydraulic pressure can be independently supplied to the plurality of oil passages in the valve body.

[0003]

However, in the conventional control valve unit of the transmission as described above, when the control valve unit is used in a continuously variable transmission, it is difficult to accommodate the control valve unit. There is a problem. This is because, in a continuously variable transmission, the maximum outer diameter portion (for example, a planetary gear and a planetary gear Outer diameter including the clutch), the space between the outer periphery of the maximum outer diameter of the continuously variable transmission and the bottom of the oil pan is smaller than the space of a normal transmission. This is because it may be difficult to accommodate the valve bodies in a multi-tiered manner while ensuring a predetermined ground clearance. The present invention aims to solve such problems.

[0004]

According to the present invention, a recess for accommodating an upper valve body is formed in a part of a case of a continuously variable transmission, and a substantially half of the lower valve body is directly attached to the case. A high pressure valve is provided in the part, and the upper valve body is housed in the recess and is attached to the upper surface of the other half of the lower valve body. Only the low pressure valve is provided on the upper valve body side, and the high pressure valve is not provided. This solves the above problem. That is, the control valve unit of the continuously variable transmission of the present invention has the upper valve body (74) and the lower valve body (72), and the high pressure oil passage (122) in a state where these are superposed on each other.
And the case housed in the case (100) having the low pressure oil passage (124).
0) is a downward facing downward valve body mounting surface (100a
1) is formed, and a recess (110b1) for accommodating the upper valve body (74) is formed, and the case (100) has a lower valve body mounting surface (100a1) on which the lower portion is formed. Side valve body (7
About half of 2) is attached, and the lower valve body (72) has a case (10) on its case attachment side.
0) is provided with a predetermined number of high pressure valves (84, 86 and 88) to which high pressure is respectively supplied from the high pressure oil passage (122), and the upper valve body is provided on the upper surface side of the half part opposite to the case mounting side. (74) is attached to the upper valve body (74) and a predetermined number of low pressure valves (90, 92, 94, 96 and 98) are supplied with low pressure from the low pressure oil passage (124) of the case (100). ) Is provided only. The above case (1
00) is preferably provided with a bleed hole (150) communicating with the high pressure oil passage (122) and opening toward a portion of the continuously variable transmission requiring lubrication. The reference numerals in parentheses indicate the corresponding members of the embodiment.

[0005]

The high pressure oil flowing into the high pressure portion of the lower valve body through the high pressure oil passage of the case is supplied to the respective high pressure valves in the lower valve body. Further, the low-pressure oil flowing through the low-pressure oil passage of the case into the low-pressure portion of the upper valve body via the lower valve body is supplied to each low-pressure valve in the upper valve body. Since the upper valve body does not have a high pressure portion but has only a low pressure portion, the size of the upper valve body can be reduced, and the upper valve body can be accommodated in the hollow portion formed in the case. Thus, even when a plurality of valve bodies are arranged in a stack in the case of the continuously variable transmission, the size of the case in the height direction can be reduced to make the device compact. When a bleed hole is formed in the high-pressure oil passage of the case, air can be released from the oil passage and the oil discharged from the bleed hole can lubricate the lubrication-required parts of the continuously variable transmission. Become.

[0006]

FIG. 3 shows a continuously variable transmission embodying the present invention.
The continuously variable transmission includes a torque converter 12 (which may be a fluid coupling), a forward / reverse switching mechanism 15, a V-belt type continuously variable transmission mechanism 29, and a differential device 5.
6 and the like, the rotation of the output shaft 10 of the engine can be transmitted to the differential device 56 at a predetermined gear ratio and rotation direction. This continuously variable transmission includes a torque converter 12
(Pump impeller 12a, turbine runner 12b, stator 12c, lockup clutch 12d, etc.), rotary shaft 13, forward / reverse switching mechanism 15 (planetary gear device 19, forward clutch 40, reverse brake 50, etc.) Drive shaft 14, drive pulley 16 (fixed cone member 18, drive pulley cylinder chamber 20 (first oil chamber 20)
a, a second oil chamber 20b), a movable cone member 22 and the like), a V belt 24, a driven pulley 26 (a fixed cone member 30, a driven pulley cylinder chamber 32, a movable cone member 34).
Etc.), a driven shaft 28, a drive gear 46, an idler gear 48, an idler shaft 52, a pinion gear 54, a final gear 44, and the like. The power transmission mechanism 60 of the continuously variable transmission includes a case 100 and a side cover 2.
00 and a torque converter housing 300. FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partial view of FIG. 3 with the side cover 200 removed and seen from the direction of arrow 1. Case 10
At 0, a passage forming portion 100a extending in the left-right direction in the drawing is formed. A lower valve body mounting surface 100a1 is formed on the lower surface side of the passage forming portion 100a in the figure. The left end side of the passage forming portion 100a in the figure is connected to a substantially cylindrical cylindrical wall portion 100b. The case 100 is divided into an upper chamber 110a on the upper side in FIG. 1 and a lower chamber 110b on the lower side in FIG. 1 by the passage forming portion 100a and the cylindrical wall portion 100b. In the lower chamber 110b, in the upper left portion of the drawing, adjacent to the passage forming portion 100a, there is a hollow portion 110b.
1 is formed. The dimension of the recess 110b1 in the left-right direction in the figure is slightly shorter than half the maximum inner dimension of the case 100 in the left-right direction in the figure. Upper chamber 1
The power transmission mechanism 60 described above is housed in 10a,
The lower chamber 110b houses a control valve unit 70 including a lower valve body 72 and an upper valve body 74, and a suction filter 80. An oil pan 82 seals the lower end side of the lower chamber 110b in the figure. The lower valve body 72 is fixed to the lower valve body mounting surface 100a1 of the case 100 through a separate plate 76 at a substantially half portion on the right side of the figure. The lower valve body 72 is covered with the upper valve body 74 via the separate plate 76 on the upper surface of the remaining left half of the lower valve body 72. The size of the upper valve body 74 in the left-right direction in the drawing is set to be approximately half the length of the lower valve body 72, and thus the upper valve body 74 can be arranged in the recess 110b1. The lower valve body 72, the separate plate 76, and the upper valve body 74 are integrally connected by a bolt (not shown). That is, the integrated control valve unit 70 is fixed to the case 100. FIG. 2 shows a cross section taken along line 2-2 in FIG. The passage forming portion 100a includes an inlet port 120, a line pressure oil passage (high pressure oil passage) 122, a lubrication port (low pressure oil passage) 124,
Relief port 126, primary pulley hydraulic port 1
28, a secondary pulley hydraulic port 130, a drain port 132, etc. are formed. These oil passages and ports open toward the lower valve body 72.
In the lower valve body 72, high pressure valves such as a pressure regulator valve 84, a speed change valve 86, a speed change command valve 88 to which high pressure (line pressure) acts are housed (FIG. 1).
reference). High pressure oil can be supplied to these valves 84, 86 and 88 from the line pressure oil passage 122 of the passage forming portion 100a. The line pressure oil passage 122 has a passage forming portion 1
A predetermined number of ribs 14 to prevent deformation of 00a due to high pressure.
0 is formed respectively. In the left half of the upper valve body 74 and the corresponding lower valve body 72,
Only the low pressure valves, such as the forward control valve 90, the reverse clutch control valve 92, the lockup clutch control valve 94, the torque converter relief valve 96, the clutch relief valve 98, which are operated by low pressure, are stored. Low pressure oil can be supplied to these valves 90, 92, 94, 96 and 98 from the lubricating port 124 of the passage forming portion 100a. FIG. 4 shows a cross section taken along line 4-4 in FIG. As shown in FIG. 4, the line pressure oil passage 122 is formed in a thick portion of the case 100. Passage forming part 100
In a, the upper chamber 11 is extended from the line pressure oil passage 122.
A bleed hole 150 that penetrates to 0a is formed.
The bleed hole 150 is arranged so as to open at a position indicated by a double arrow A in FIG. Accordingly, it is possible to bleed the line pressure oil passage 122 and supply the oil discharged from the bleed hole 150 with the air bleeding to the drive pulley 16 of the power transmission mechanism 60 and the like.

Next, the operation of this embodiment will be described. High-pressure oil is supplied to the lower valve body 72 from an oil pump (not shown), which is an oil pressure source, through the inlet port 120 of the case 100, and is regulated by the pressure regulator valve 84 to a line pressure. This line pressure is supplied to the power transmission mechanism 60 in the upper chamber 110a through the line pressure oil passage 122 of the case 100, the secondary pulley hydraulic port 130, and the like. At this time, air is removed from the line pressure pipeline through the bleed hole 150 formed in the line pressure oil passage 122, and the drive pulley 16 and the V belt 24 are lubricated by the oil jetted together with the air. Be seen. Since only the low pressure valve is provided in the upper valve body 74 and the high pressure valve is not provided, the upper valve body 74 can be made small. Therefore, the upper valve body 74 can be housed in the recess 110b1 adjacent to the passage forming portion 100a. As a result, unlike the conventional case, the case 100 does not have to be formed to have a downwardly extending dimension as shown in FIG. Can be.

[0008]

As described above, according to the present invention,
Since the length dimension of the upper valve body can be reduced, the control valve unit can be housed in a narrow space in the vertical direction of the continuously variable transmission, and the device can be made compact. Not only is it easy to bleed air in the control valve unit, but the oil that has flowed out by bleeding air can be used to lubricate the power transmission mechanism.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a control valve unit mounting portion of a continuously variable transmission according to the present invention.

FIG. 2 is a diagram illustrating an arrangement of oil passages and ports in a passage forming portion.

FIG. 3 is a diagram showing a continuously variable transmission embodying the present invention.

FIG. 4 is a diagram illustrating a bleed hole.

FIG. 5 is a cross-sectional view showing a control valve unit mounting portion of a conventional transmission.

[Explanation of symbols]

 60 power transmission mechanism 70 control valve unit 72 lower valve body 74 upper valve body 100 case 100a passage forming portion 110a upper chamber 110b lower chamber 120 inlet oil passage 122 line pressure oil passage (high pressure oil passage) 124 lubrication port (low pressure oil passage) 132 Drain oil passage 150 Bleed hole

Claims (2)

[Claims] 1. A control valve unit for a continuously variable transmission, which has an upper valve body and a lower valve body, and is housed in a case having a high-pressure oil passage and a low-pressure oil passage in a state in which they are overlapped with each other. In the above case, the lower valve body mounting surface facing downward is formed, and the recessed portion capable of accommodating the upper valve body is formed. About half of the side valve body is attached, and the lower valve body is provided with a predetermined number of high pressure valves to which high pressure is respectively supplied from the high pressure oil passage of the case on the case attachment side of the lower valve body. The upper valve body is attached to the upper surface side of the half part opposite to the mounting side, and the upper valve body receives low pressure from the low pressure oil passage of the case. Control valve unit for a continuously variable transmission in which only a predetermined number of low-pressure valve to be supplied respectively, characterized in that it is provided. 2. The case is formed with a bleed hole communicating with a high pressure oil passage of the case and opening toward a portion of the continuously variable transmission requiring lubrication. Control valve unit for the continuously variable transmission described.