JPH0735160Y2 - Governor valve for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a governor valve for an automatic transmission that produces a governor pressure corresponding to a vehicle speed.

(Prior Art) Generally, as shown in FIG. 3, a governor valve is bolted concentrically to a parking gear 8 which rotates together with a transmission output shaft 6 extending from the transmission case 2 into the rear extension 4.
A valve body 12 joined by 10 is provided, and a primary valve and a secondary valve are inserted in the valve body in the radial direction.

The secondary valve responds to the centrifugal force according to the output shaft speed (vehicle speed), regulates the source pressure from the input port 14 to governor pressure, and the primary valve uses this governor pressure as a certain output shaft speed (set vehicle speed). ) Open with the above and output from output port 16.

By the way, the governor pressure needs to be proportional to the vehicle speed, but since the secondary valve responds to the centrifugal force, it tends to rise in a quadratic curve with respect to the vehicle speed.

Therefore, conventionally, Nissan Motor Co., Ltd. issued "RN4F02A type, RL4F0
2A Type Automatic Transaxle Maintenance Manual "
As described on page 25 of (A261C06), it has been proposed to configure the secondary valve so that the governor pressure can be made more proportional to the vehicle speed with the two-stage pressure regulation characteristic. However, the secondary valve having such a configuration inevitably becomes long.

By the way, around the valve body 12, there is a large boss portion 20 that pivotally supports the parking pole 18 that enables parking by engaging the parking gear 8 in the parking (P) range and blocking the rotation of the output shaft 6. The valve body 12 has a central hole 12a through which the large-diameter output shaft 6 penetrates. Therefore, the annular valve body 12 has a limit in increasing the radial thickness.

Therefore, the secondary valve having the two-stage characteristic may not be inserted into the limited radial thickness portion of the valve body 12.

In order to solve this problem, conventionally, two secondary valves having different pressure regulation characteristics are sequentially combined and provided, and the secondary pressure is sequentially regulated by these secondary valves to make a governor pressure almost proportional to the vehicle speed. It was also in practical use that a valve was used to output at a set vehicle speed or higher.

(Problems to be solved by the invention) However, in such a vana valve, three valves are arranged in a fan shape with respect to the valve body 12 as shown by 22, 24 and 26 in FIG. Since it is necessary to individually process each valve insertion hole, the number of processing steps is increased, and the rotational balance of the valve body 12 is poor, and uneven rotation and vibration are likely to occur.

The present invention aims to solve the above-mentioned problems by suitably disposing three valves.

(Means for Solving the Problem) For this purpose, the present invention is to insert three circumferentially arranged valves in a radial direction into an annular valve body that rotates together with a transmission output shaft. A governor valve for an automatic transmission that sequentially regulates a source pressure by a valve to produce a governor pressure corresponding to a vehicle speed, wherein the valve body is orthogonal to each other through a rotation axis line.
4 holes are formed by drilling diametrical through holes from the direction, and the above-mentioned 3 valves are respectively inserted into 3 of these 4 holes, and the remaining 1 hole is used as a valve body. This is a lightening hole for rotation balance.

(Function) The valve body rotates together with the output shaft of the transmission, and the three valves inserted in the valve body sequentially adjust the original pressure in response to the centrifugal force, and generate and output the governor pressure corresponding to the vehicle speed.

By the way, in the annular valve body, four holes are formed by forming diametrical through holes from two directions which pass through the rotation axis and are orthogonal to each other, and the above three valves are respectively inserted into the three holes. Since the remaining one hole is used as the lightening hole for the rotation balance of the valve body, even if three valve insertion holes are required, the processing man-hour is only two times, and this processing man-hour remains the same. It is also possible to machine the rotation balance lightening hole at the same time.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a governor valve of the present invention, in which the same parts as in FIG. 3 are designated by the same reference numerals.

In this example, the governor valve is one primary valve 30,
It is composed of first and second secondary valves 31 and 32, which are arranged in the valve body 12 as shown in FIG.

The first secondary valve 31 is provided with a spool 34 slidably inserted in the radial direction as shown in FIG. 1 (a), which has a stepped shape, and a spring 36 which limits the radial direction outward. It is elastically supported in the position and seated on the thick portion 40 of the valve body 12 via the retainer plate 38 at the end of the spring 36 remote from the spool 34. The retainer plate 38 has a shape in which the portion 38a on which the corresponding end of the spring 36 is seated penetrates into the thick portion 40,
A notch 42 through which the entry portion 38a can pass in the axial direction is formed by opening the parking gear mating surface 12b (see FIG. 3) of the valve body 12.

The second secondary valve 32 and the primary valve 30 have conventional structures, and a detailed description thereof will be omitted.
The secondary valve 32 is composed of a stepped spool 44, a spring 46 and a retainer plate 48 as shown in FIG. 1 (c), and the primary valve 30 is a spool 50 as shown in FIG. 1 (a).
It is composed of a spring 52 and a retainer plate 54.

When inserting the valves 30, 31 and 32, use the annular valve body.
12, two directions α and β passing through the axis of rotation and orthogonal to each other
The more diametrical through holes are drilled to form four holes 72,74,76,78. Among these holes, the largest diameter primary valve 30 and the next largest diameter first secondary valve 31 are inserted into the holes 72 and 74 in the same direction as the machining direction, and the hole 78 is arranged in the same direction as the machining direction. The second secondary valve 32 having the smallest diameter is inserted.
The remaining one hole 76 is a lightening hole for balancing the rotation of the valve body 12 with respect to the second secondary valve 32, and the diameter is determined so that this purpose is achieved.

Next, the oil passage will be described. The valve body 12 has ports 56 and 58 communicating with the input port 14 and the output port 16 shown in FIG.
Is provided as shown in FIG. 1 (b), and the port 56 communicates with the input port 60 of the valve 31 and the port 58 communicates with the output port 62 of the valve 30. Then, the output port 64 of the valve 31 is connected to the input port 66 of the valve 32, and the output port 68 of the valve 32 is connected to the input port 70 of the valve 30.

The operation of the above embodiment will be described below. When traveling forward, D range pressure entered from port 14 (see Fig. 3) to port 56
P _D is supplied to port 60 of valve 31. The valve 31 reduces the D range pressure P _D as shown by the dotted line in FIG. 2 and outputs the output pressure P ₃₁ from the port 64. The valve 32 reduces the pressure P ₃₁ input to the port 66 as shown by the alternate long and short dash line in FIG. 2 and supplies the reduced pressure P ₃₁ to the port 70 of the valve 30 from the port 68. The valve 30 opens at the vehicle speed above the set speed indicated by V _S in Fig. 2 and the port
The port 70 is communicated with the port 62, and the governor pressure P _G substantially corresponding to the vehicle speed as indicated by the solid line in FIG.

By the way, in this example, the insertion holes 72, 7 of the valves 30, 31, 32 are
Forming 4,78 by diametrically penetrating holes in the valve body 12 from two directions α, β orthogonal to each other passing through the axis of rotation of the valve body, and then forming three valve insertion holes by two processes. Therefore, it is possible to reduce the number of processing steps, and at this time, it is possible to simultaneously process the rotation balancing lightening hole of the valve body.

(Effect of the Invention) As described above, the governor valve of the present invention is composed of three valves to make the governor pressure proportional to the vehicle speed as described above. Since it can be formed by processing, the number of processing steps can be reduced, and at the same time, the rotational balance of the valve body can be balanced, which is advantageous.

[Brief description of drawings]

FIG. 1 shows an embodiment of the governor valve of the present invention, (a)
Is a sectional view taken along the line A-A in (b), (b) is a front view, (c) is a sectional view taken along CC in (b), FIG. 2 is an output pressure characteristic diagram of the same governor valve, and FIG. 3 is a governor valve. FIG. 4 is a partial cross-sectional view of an automatic transmission showing installation locations, and FIG. 4 is an explanatory view showing a valve arrangement in a conventional governor valve. 12 …… Valve body 30 …… Primary valve 31 …… First secondary valve 32 …… Second secondary valve α, β …… Hole machining direction 72,74,78 …… Valve insertion hole 76 …… Rotation balance meat Hole

Claims (1)

[Scope of utility model registration request] 1. A ring-shaped valve body that rotates together with a transmission output shaft is provided with three valves arranged in the circumferential direction, each of which is arranged in the radial direction. In a governor valve of an automatic transmission that produces a governor pressure, the valve body is orthogonal to each other through a rotation axis line.
4 holes are formed by drilling diametrical through holes from the direction, and the above-mentioned 3 valves are respectively inserted into 3 of these 4 holes, and the remaining 1 hole is used as a valve body. A valve body for an automatic transmission with a lightening hole for rotation balance.