JPH02125158A - Governor valve for automatic transmission - Google Patents

Abstract

PURPOSE:To easily insert the retainer plate into the radial thick portion of a valve body for a valve with a long spring by forming a penetration portion on the retainer plate and forming a notch to be passed by this penetration portion on the valve body. CONSTITUTION:A primary valve 30 and the first and second secondary valves 31 and 32 are radially inserted into the valve body 12 of a governor valve. A spring 36 elastically supporting a spool 34 of the first secondary valve 31 is seated on the thick portion of the valve body 12 via a retainer plate 38, a seat portion 38a is formed in a shape penetrating into the thick portion 40, and a notch 42 through which the penetration portion 38a can pass in the axial direction is formed on the parking gear mating face 12a of the valve body 12. The spring can be easily inserted into the limited radial thick portion of the valve body for the valve with the long spring elastically supporting the spool.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a governor valve that generates a pressure corresponding to vehicle speed in an automatic transmission.

(Prior art) Governor valves are generally manufactured by daily automobiles.
2A type, RL4FO2A type Automatic transaxle maintenance manual J (A261CO6) As shown in Fig. 3 and Fig. 4, the governor valve rotates together with the transmission output shaft 6 extending from inside the transmission case 2 to the rear extension 4. A valve body 12 is concentrically connected to a rotating body, usually a parking gear 8, with bolts 10, and a spool 14 is inserted into the valve body 12 so as to be slidable in the radial direction. It is biased in the radial direction by a spring 18 seated on the valve body 12.

The governor valve has a manual port 20 at the mating surface 12a of the valve body 12 that is connected to the parking gear 8.
This source pressure is regulated according to the rotational speed of the output shaft 6 (vehicle speed), and governor pressure, which increases as the vehicle speed increases, is output to the output port 22 of the parking gear 8.

Incidentally, around the valve body 12, there is a parking ball 24 that engages with the parking gear 8 in the parking (P) range and prevents rotation of the output shaft 6 to enable parking.
The large boss portion 26 that pivots the rear extension 4
A central hole 12b is required at the center of the valve body 12, through which the large-diameter output shaft 6 passes. Therefore, there is a limit to increasing the wall thickness of the annular valve body 12 in the radial direction.

On the other hand, when the valve body 12 has a large diameter, the centrifugal force applied to the spool 14 increases, and in order to obtain the above-mentioned predetermined pressure regulating effect, it is necessary to increase the pressure receiving area (diameter) of the spool 14. This will lead to larger size. In this sense, the smaller the diameter of the valve body 12, the better, and in this respect, the radial wall thickness of the valve body 12 cannot be increased.

However, in the governor valve of the conventional structure described above, as shown in FIG. 4, the retainer plate 16 on which the spring 18 is seated causes the corresponding end of the spring 18 to enter the thick portion 12C of the valve body 12 that supports the retainer brake 16. Therefore, if a long spring 18 is required to meet the required governor pressure characteristics, it becomes difficult to accommodate the governor valve within the radial wall thickness of the valve body 12.

Further, in the conventional structure, for the same reason, the spool 14 is moved away from the center of rotation of the valve body 12, and the centrifugal force on the spool 14, which is proportional to the square of the spool rotation radius, increases, and the spring 18 is made larger accordingly. This makes it increasingly difficult to insert the governor valve.

The present invention aims to solve the above-mentioned problem by determining the shape of the retainer plate so that the end of the spring seated on the retainer plate can penetrate into the thick part of the valve body that supports the retainer plate. .

(Means for Solving the Problems) For this purpose, the present invention includes a valve body that is slidably inserted in a radial direction into a valve body that is concentrically connected to a rotating body that rotates together with a transmission output shaft, and this spool is In a governor valve for an automatic transmission that is biased in the radial direction by a spring seated on a valve body via a retainer plate, the portion of the retainer plate where the spring is seated is located within a thick walled portion of the valve body that supports the retainer plate. A notch through which this intruding portion can pass in the axial direction is formed in a face of the valve body mating with the rotating body.

(Function) The valve body rotates together with the transmission output shaft, and the spool inserted into the valve body receives a centrifugal force according to the transmission output shaft rotation speed, that is, the vehicle speed, and is also acted on by a spring to adjust the pressure to a specified level. Depending on the function, the governor pressure corresponding to the vehicle speed is output.

By the way, since the portion of the retainer plate on which the spring is seated is intruded into the thick part of the valve body that supports the retainer plate, the installation position of the spring can be moved toward the thick part by this intrusion. To facilitate the insertion of a governor valve even with limited radial wall thickness of the valve body or when the spring needs to be lengthened due to required governor pressure characteristics.

Furthermore, when the retainer plate has the above-mentioned intrusion part, the aperture is also provided with a notch that allows the intrusion part to pass through in the axial direction and is opened in the mating surface of the valve body with the rotating body, so that the above-mentioned movement can be carried out from this opening. The retainer plate can be attached to the valve body while passing through the intrusion part,
The retainer plate attached in this manner can be reliably prevented from being pulled out from the opening by the rotating body on the mating surface of the valve body.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the governor valve of the present invention, and the same parts in FIGS. 3 and 4 are designated by the same reference numerals.

In this example, the governor valve is composed of one primary valve 30 and first and second secondary valves 31, 32, which are arranged in the valve body 12 as shown in FIG. 1(b) and inserted in the radial direction. do.

As shown in FIG. 1(a), the first secondary valve 31 includes a spool 34 which is slidably inserted in the radial direction, and has a stepped shape, and is moved radially outward by a spring 36 to the limit shown in the figure. Spring 36 supported in position and remote from spool 34
The end of the valve body 12 is connected to the valve body 12 via the retainer plate 38.
It is seated on the thick part 40 of. The retainer plate 38 has a portion 38a on which the corresponding end of the spring 36 is seated, and a thick portion 4
A notch 42 is formed in the parking gear mating surface 12a of the valve body 12 through which the intruding portion 38a can pass in the axial direction.

The second secondary valve 32 and the primary valve 30 each have a conventional structure and will not be described in detail.
The second secondary valve 32 consists of a stepped spool 44, a spring 46, and a retainer plate 48 as shown in FIG. 1(C), and the primary valve 30 consists of a spool 50 and a spring 52 as shown in FIG. 1(a). and a retainer plate 54.

Next, to explain the oil passage, there is a bow in the valve body 12 that leads to the input port 20 and output port 22 shown in FIG.
56 and 58 are provided as shown in FIG. 1(5), the port 56 communicates with the port 0 entering the valve 310, and the port 58 communicates with the port 2 outputting the valve 30. Then, the output port 4 of the valve 31 is connected to the valve 320 input port 6, and the output port 8 of the valve 32 is connected to the input port door 0 of the valve 30, respectively.

The operation of the above embodiment will be explained next. D range pressure PD entering the boat 56 from the boat 20 during forward travel is supplied to the boat 60 of the valve 31. Valve 31 is this D
Range pressure P. is depressurized and an output pressure P31 as shown by the dotted line in FIG. 2 is outputted from the port 64.

The valve 32 reduces the pressure P31 input to the boat 66 as shown by the dashed line in FIG. 2, and supplies the reduced pressure to the port 70 of the valve 30 from the port 68. The valve 30 opens at a speed higher than the set vehicle speed shown by the solid line in FIG.
2, and the governor pressure Pc as shown by the solid line in FIG. 2 is output from the boat 62 to the port 22 (see FIG. 3) via the port 58.

By the way, in the first secondary valve 31 of this example,
Portion 38a of retainer plate 38 on which spring 36 is seated
and the valve body 12 that supports this retainer plate.
Since the spring 36 is intruded into the thick part 40, the installation position of the spring 36 can be moved toward the thick part 40 by this intrusion, and as is clear from the pressure characteristic P31 in FIG. Although it would be difficult if the valve body 12 were too long, it is possible to insert the valve 31 within a limited radial thick portion of the valve body 12.

Furthermore, the retainer plate 38 has an intrusion portion 38a;
``It is impossible to attach it to the valve body 12 as it is, but by providing a notch 42 in this valve body,
Through this, the retainer plate 38 can be assembled at a predetermined position while passing through the intrusion portion 38a. When the valve body 12 is attached to the parking gear 8 as shown in FIG. 3, the notch 42 is closed by the parking gear, thereby preventing the retainer plate 38 from being pulled out from the valve body 12.

(Effects of the Invention) Thus, as described above, the governor valve of the present invention has the retainer plate 38 in a special shape having the intrusion portion 38a,
A notch 42 through which this intrusion part passes is formed in the valve body 12.
Therefore, a part of the spring 36 is located within the thick wall part 40 of the valve body 12 that supports the retainer plate, and the long valve 31 and the cone also have a part of the spring 36 located within the thick part 40 of the valve body 12 that supports the retainer plate. It can be easily inserted into the thick walled part, and if the intrusion part 38a of the retainer plate 38 is provided protrudingly, the awl can also be inserted into the valve body 12 through the notch 42.
It can be assembled into

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the governor valve of the present invention, (a)
(b) is a front view, (C) is a)
Figure 2 is an output pressure characteristic diagram of the same governor valve, Figure 3 is a partial cross-sectional view of the automatic transmission showing the installation location of the governor valve, and Figure 4 is a cross-sectional view of the conventional governor valve. . 12... Valve body 12a... Matching surface 12b... Output shaft through center hole 30... Primary valve 31... First secondary valve 32... Second secondary valve 34... Spool 36... ... Spring 38 ... Retainer plate 38a ... Intrusion portion 40 ... Thick wall portion for supporting retainer plate 42 ...
Notch

Claims (1)

[Claims] 1. A spool is slidably inserted in a radial direction into a valve body concentrically connected to a rotating body that rotates together with a transmission output shaft,
In a governor valve for an automatic transmission in which this spool is biased in the radial direction by a spring seated on a valve body via a retainer plate, the portion of the retainer plate where the spring is seated is connected to the valve body supporting the retainer plate. 1. A governor valve for an automatic transmission, characterized in that a governor valve for an automatic transmission is formed by penetrating into a thick wall portion and opening a notch through which the penetrating portion can pass in the axial direction on a face of a valve body mating with the rotating body.