JPH0349326Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a governor valve for an automatic transmission used in automobiles and the like.

[Conventional technology]

For example, the governor valve for conventional automatic transmissions is as described in "Toyota Automatic Transmission A42/43D Model Repair Manual" Toyota Motor Sales Co., Ltd., published in March 1980, pages 1 to 17. There is something, and its diagram is shown in Figures 5 and 6.
As shown in the figure.

That is, as shown in FIG. 5, reference numeral 1 denotes a governor valve, which includes a governor body 3 that rotates together with the output shaft 2, and a valve hole 3 in the governor body 3.
A governor spool 4 is fitted into the through hole 4a of the governor spool 4, a rod 5 is fitted into and passes through the through hole 4a of the governor spool 4 so as to be movable in the axial direction, and a rod 5 is attached to one end of the rod 5 by a snap spring 6. The governor weight 7, the stopper portion 5a provided at the other end of the rod 5, and the governor spool 4
and a spring 8 compressed between.

Therefore, when the rotational speed of the output shaft 2 is low, the governor spool 4, rod 5, and governor weight 7 act together, and the oil passage 9 is adjusted so as to balance the centrifugal force acting on them. The governor pressure in the oil passage 10 is regulated using the line pressure as the hydraulic limit. On the other hand, as the rotational speed of the output shaft 2 increases, the centrifugal force acting on the rod 5 and the governor weight 7 increases, compressing the spring 8 and moving it away from the output shaft 2. When the rod 5 moves a predetermined amount, the stopper portion 5a is moved to the governor body 3.
Since the movement is stopped by contacting the wall surface of the oil passage 10, the governor pressure in the oil passage 10 is regulated so as to balance the centrifugal force acting on the governor stopper 4 and the biasing force of the spring 8. This makes it possible to obtain governor pressure characteristics whose characteristics change in two stages.

[Problem that the invention attempts to solve]

However, in the case of the governor valve of such a conventional automatic transmission, when the governor weight 7 collides with the governor body 3, the peripheral edge of the valve hole 3a of the governor body 3 is deformed, and the smooth flow of the governor spool 4 is affected. There was a problem in that movement was obstructed and there was a risk of malfunction.

That is, when the rotational speed of the output shaft 2 is high and the stopper portion 5a of the rod 5 is stopped by the wall surface of the governor body 3, when the rotational speed of the output shaft 2 suddenly decreases, the attachment of the spring 8 is caused. The rod 5 is pushed back toward the output shaft 2 by the force, causing the governor weight 7 to collide with the governor body 3. In this way, when the governor weight 7 repeatedly collides with the governor body 3 each time the rotational speed of the output shaft 2 changes, the peripheral edge of the valve hole 3a of the governor body 3 is deformed by the end face of the governor weight 7, and as shown in FIG. A burr 3b is generated as shown in FIG.

As a result, the relative movement of the governor spool 4 with respect to the rod 5 is not performed smoothly due to the burr 3a, and a staking phenomenon occurs in the governor spool 4, resulting in malfunction, making it impossible to obtain the predetermined governor pressure. There is a risk that it will disappear. In such a case, it will no longer be possible to perform gear shifts as specified, and if the line pressure characteristics are set to control line pressure based on governor pressure, the line pressure will also not change as specified. This causes problems such as damage to friction elements such as clutches and brakes.

[Means for solving problems]

This invention was made by focusing on these conventional problems, and consists of a governor body that rotates together with the rotating shaft, a governor body that is fitted into the valve hole of the governor body so as to be movable in the axial direction, and the force that acts on the governor body. It has a governor spool that can adjust the governor pressure according to the pressure, a rod fitted through a through hole of the governor spool so as to be movable in the axial direction, and a governor weight and a stopper provided at each end of the rod. a governor weight assembly; a spring that biases the governor weight toward the governor spool;
and a governor configured to balance the centrifugal force acting on the governor spool itself and the centrifugal force acting on the governor weight assembly transmitted to the governor spool via the spring when the rotational speed of the rotating shaft is below a predetermined value. When the pressure is regulated and the rotational speed of the rotating shaft is greater than a predetermined value, the governor weight assembly compresses the spring and moves relative to the governor spool, causing the stopper to move against the wall surface of the governor body. In the governor valve of an automatic transmission, the governor pressure is regulated so as to balance the centrifugal force acting on the governor spool itself and the urging force of the spring. The invention is characterized in that a relief portion is provided around the governor spool on at least one of the surfaces of the governor spool.

[Effect]

In this invention, when the rotational speed gradually decreases from a high state, the governor weight assembly returns to the rotation center side of the rotating shaft due to the biasing force of the spring, and the governor weight collides with the governor body. Since a relief portion is provided around the governor spool on at least one of the mutually contacting surfaces of the governor body and the governor body, deformation of the peripheral edge of the valve hole of the governor body by the governor weight is prevented. Therefore,
The axially movable fitted state between the governor body and the governor spool is maintained in the initial state, and smooth relative movement of both members can be ensured over a long period of time.

〔Example〕

This invention will be explained below based on illustrated embodiments.

Figure 1 shows an example of this invention.
This is a governor valve for an automatic transmission used in an automobile, with the upper half showing high-speed rotation and the lower half showing low-speed rotation.

First, to explain the configuration, this governor valve 1
1 is a first valve hole 1 of a governor body 13 that rotates together with a governor shaft (not shown) that is a rotating shaft.
It is composed of two valves: a secondary governor valve A provided at a portion 3a of the governor body 13, and a primary governor valve B provided at a second valve hole 13b portion of the governor body 13. Secondary governor valve A is a valve that regulates governor pressure in response to line pressure, and primary governor valve B is a valve that regulates governor pressure in response to line pressure.
The governor pressure adjusted by
-It is an OFF valve.

This secondary governor valve A includes a first governor spool 14 fitted into a first valve hole 13a of a governor body 13 so as to be movable in the axial direction;
A governor weight assembly 20 supported by the first governor spool 14 so as to be relatively movable in the axial direction.
and a spring 1 provided between this governor weight assembly 20 and the first governor spool 14.
It is equipped with 8 and.

The first governor spool 14 has a large diameter part 14b and a small diameter part 14c on its outer periphery, and has both large and small diameter parts 14.
There is an annular groove 14d continuous in the circumferential direction between b and 14c.
is formed. This first governor spool 14
The large diameter portion 14b is fitted into the large diameter hole of the valve hole 13a, and the small diameter portion 14c is fitted into the small diameter hole of the valve hole 13a. The opening degree of one end of the communication passage 21 communicating with the valve B can be adjusted, and the small diameter portion 14c can open and close the liquid passage 22 to which line pressure is supplied.

The governor weight assembly 20 also includes a rod 15 fitted into the through hole 14a of the first governor spool 14 so as to be movable in the axial direction, and a snap spring 16 attached to the rotationally outer end of the rod 15. A snap spring 23 is attached to the rotating inner end of the governor weight 17 and the same rod 15.
and a stopper 24 attached by. A spring 18 is provided between the stopper 24 and the first governor spool 14, thereby urging the first governor spool 14 toward the governor weight 17.

Rod 15 of such governor weight assembly 20
For movement in the axial direction, the stopper 24 stops at the wall surface 1 of the governor body 13 in the direction away from the center of rotation.
3c, and in the direction toward the center of rotation, the governor weight 1
7 is restricted by contacting the outer end surface of the governor body 13. Therefore, the governor weight 1 contacts the outer peripheral edge of the governor body 13 of the first valve hole 13a through which the first governor spool 14 passes.
A ring groove 25 is provided on the end face side of the valve 7, which is a relief part whose inner diameter is smaller than the diameter of the first valve hole 13a and whose outer diameter is larger than the diameter of the first valve hole 3a.

In addition, the governor weight 17 and the stopper 24
can be attached to and detached from the rod 15 using snap springs 16 and 23, respectively, so the weight of the entire governor weight assembly 20 can be adjusted by changing the weight of the governor weight 17 or the stopper 24. .

The primary governor valve B also includes a second governor spool 26 that is fitted in a second valve hole 13b provided in the governor body 13 concentrically with the first valve hole 13a so as to be movable in the axial direction;
a return spring 27 that urges the second governor spool 26 toward the center of rotation; an outer plate 28 on which one end of the return spring 27 is seated and that limits movement of the second governor spool 26 toward the rotational center; An inner plate 29 restricts rotational inward movement of the governor spool 26.

On the outer periphery of the second governor spool 26, an annular groove 26a is provided in the middle part in the axial direction, and lands 26b and 26c are set on both sides of the annular groove 26a, and the communication path 21 communicates with the annular groove 26a. A liquid path 30 for governor pressure is provided at a position that can be opened and closed by a land 26c on the outer side of the rotation.

Note that a governor gear is attached to the governor shaft to which the governor valve 11 is attached,
A governor drive gear attached to the differential case meshes with this governor gear, and rotational force is transmitted by this governor drive gear, causing rotation about the axis X shown in the figure.

Next, the effect will be explained.

When the rotational speed of the governor shaft is below a predetermined value, the centrifugal force acting on the governor weight assembly 20 is smaller than the biasing force of the spring 18;
As shown in the lower half of Figure 1, the governor weight 1
7 is located on the rotation center side. In this state, the centrifugal force acting on the governor weight assembly 20 is transmitted to the first governor spool 14 via the spring 18, so that the first governor spool 14 is A centrifugal force acts on both sides.
As a result, the first governor spool 14
A pressure regulating action is performed so that the hydraulic pressure (line pressure) of No. 2 becomes a value that balances both centrifugal forces.

That is, when a manual valve (not shown) is selected to be in the D range, the 2nd range, or the 1st range, line pressure acts on the secondary governor valve A from the liquid path 22. By controlling the flow rate flowing into the communication path 21 from the liquid path 22 to which this line pressure is supplied by the small diameter portion 14c of the first governor spool 14, the flow rate between the large diameter portion 14b and the small diameter portion 14c is controlled. The hydraulic pressure (governor pressure) on the communication path 21 side that acts on the difference in area on the end face side is adjusted so that the force acting on the first governor spool 14 in the direction of the rotation center of the governor shaft and the centrifugal force are balanced. perform an action. Therefore, the governor pressure in the communication passage 21 has a value that balances the centrifugal force acting on both the first governor spool 14 and the governor weight assembly 20.

The governor pressure regulated by the secondary governor valve A acts on the primary governor valve B from the communication passage 21. At this time, since the centrifugal force acting on the second governor spool 26 of the primary governor valve B is smaller than the urging force of the return spring 27, as shown in the lower half of the figure,
The second governor spool 26 closes the communication path 21. As a result, the governor pressure in the liquid path 30 is 0.
Therefore, when the rotational speed of the governor shaft is at the minimum vehicle speed below a predetermined value, no governor pressure acts on each shift valve or lock-up control valve.

Thereafter, when the rotational speed of the governor shaft becomes larger than a predetermined value, the centrifugal force acting on the governor weight assembly 20 becomes larger than the biasing force of the spring 18, and as shown in the upper half of the figure, the governor weight assembly 20 compresses the spring 18 and moves it away from the center of rotation of the governor shaft. When the governor weight assembly 20 moves a predetermined distance, the stopper 24 comes into contact with the wall surface 13c of the governor body 13, thereby stopping its movement. In this state, the centrifugal force acting on the governor weight assembly 20 is applied to the governor body 1.
3 is received by the wall surface 13c of the communication path 2.
The first governor pressure is regulated to a value corresponding to the urging force of the first governor spool 14 and the spring 18. As a result, the characteristics of the governor pressure change stepwise at the predetermined value of the rotational speed.

As described above, when the rotational speed of the governor shaft changes from a state higher than the predetermined value to a state lower than the predetermined value, the centrifugal force acting on the governor weight assembly 20 becomes smaller than the biasing force of the spring 18, and as a result, the governor Weight assembly 20
is pushed back to its initial position. Therefore, the governor weight 17 collides with the governor body 13.

However, the first governor spool 1 on the surface of the governor weight 17 that contacts the governor body 13
4 is provided with a ring groove 25, which is a relief part, so that the governor weight 17 does not come into contact with the governor body 13 in this part. Therefore, the peripheral edge of the first valve hole 13a of the governor body 13 does not change due to the collision force of the governor weight 17, and burrs do not form on the peripheral edge unlike the conventional device. Therefore, the relative movement of the first governor spool 14 with respect to the governor body 13 can always be maintained smoothly, and a predetermined governor pressure can be generated depending on the rotational speed of the governor shaft.

The governor pressure regulated as described above acts on the primary governor valve B from the communication passage 21. At this time, since the centrifugal force acting on the second governor spool 26 of the primary governor valve B becomes larger than the biasing force of the return spring 27, the second governor spool 26 resists the biasing force of the return spring 27. Move away from the center of rotation of the governor shaft. Thereby, the communication path 21 and the liquid path 30 are communicated with each other via the annular groove 26a provided in the second governor spool 26. As a result, governor pressure having characteristics as shown in FIG. 2 is output from the governor valve 11, and the governor pressure corresponding to the vehicle speed is thus distributed to each shift valve and lock-up control valve.

FIGS. 3 and 4 show other embodiments of this invention.

In the embodiment shown in FIG. 3, a ring groove 25a (recess) is provided in the governor body 13 in place of the ring groove 25 (relief) provided in the governor weight 17 of the previous embodiment. Also, as shown in Figure 4, the shape of the relief part is replaced with a ring-shaped seat,
The corner of the first valve hole 13a of the governor body 13 may be chamfered as a relief portion 25b to provide a slope or roundness.

The rest of the structure is the same as that of the embodiment described above, and this structure also prevents deformation of the peripheral edge of the first valve hole 13a of the governor body 13, as in the embodiment described above. can do.

In the above embodiments, only one of the governor weight 17 and the governor body 13 is provided with a relief portion, but it goes without saying that both may be provided with a relief portion. In addition, the first governor spool 1
Since a relief portion is also provided around the fourth rod 15, smooth operation between the first governor spool 14 and the governor weight assembly 20 can be similarly ensured.

[Effect of idea]

As explained above, according to this idea,
When the rotational speed of the governor valve fluctuates, a collision between the governor weight and the governor body may occur and a relief part is provided in the area where deformation may occur.As a result, the circumference of the valve hole in the governor body will not be deformed. This can be prevented from occurring. Therefore, smooth operation of the governor spool and the governor weight assembly can be ensured at all times, and a predetermined governor pressure regulating action can be obtained.
Therefore, it is possible to prevent malfunctions such as poor shifting of the automatic transmission and damage to the clutch, brake, etc., from occurring.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of the central part of a governor valve of an automatic transmission showing one embodiment of this invention, and Fig. 2 is a graph showing the relationship between governor pressure (Kg/cm ² ) and governor rotation speed (rpm). FIGS. 3 and 4 are sectional views showing the main parts of other embodiments of this invention, and FIG.
This figure is a sectional view showing a governor valve of a conventional automatic transmission, and FIG. 6 is an explanatory view showing the main parts of a conventional modified governor body. 11...Governor valve, 13...Governor body, 13a...Valve hole, 13c...Wall surface, 14...
Governor spool, 14b...large diameter section, 14c...
Small diameter portion, 14d...Annular groove, 15...Rod, 1
7...Governor weight, 18...Spring, 2
0...Governor weight assembly, 21...Communication path,
22, 30...liquid path, 25, 25a, 25b...
Ring groove (relief part), A...Secondary governor valve, B...Primary governor valve.

Claims (1)

[Scope of utility model registration request] A governor body that rotates together with a rotating shaft, a governor spool that is fitted into a valve hole of the governor body so as to be movable in the axial direction and that can adjust the governor pressure according to the applied force, and a through hole in the governor spool. a governor weight assembly having a rod fitted through the rod so as to be movable in the axial direction, a governor weight and a stopper provided at both ends of the rod, and a spring biasing the governor weight toward the governor spool; and a governor configured to balance the centrifugal force acting on the governor spool itself and the centrifugal force acting on the governor weight assembly transmitted to the governor spool via the spring when the rotational speed of the rotating shaft is below a predetermined value. When the pressure is regulated and the rotational speed of the rotating shaft is greater than a predetermined value, the governor weight assembly compresses the spring and moves relative to the governor spool, causing the stopper to move against the wall surface of the governor body. In the governor valve of an automatic transmission, the governor pressure is regulated so as to balance the centrifugal force acting on the governor spool itself and the urging force of the spring. A governor valve for an automatic transmission, characterized in that a relief portion is provided around the governor spool on at least one of the surfaces of the governor valve.