JPS6235986Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydraulic pressure adjustment device for a hydraulic control device for an automatic transmission.

[Conventional technology] Conventionally, in a hydraulic control device for an automatic transmission,
To adjust the hydraulic pressure from the hydraulic source and supply stable hydraulic pressure to the shift valve or friction engagement device,
The hydraulic regulator, i.e., the line pressure regulating valve, has a spool,
It has a spring, an oil chamber supplied with hydraulic pressure from a hydraulic source, and a feedback oil chamber that biases the hydraulic pressure against the spring, and is controlled by the balance between the spring and the feedback hydraulic pressure supplied to the feedback oil chamber. A regulated line pressure is generated by controlling the communication between the oil chamber and the discharge port.

[Problems to be solved by the invention] However, since there are variations in the accuracy of the spring and the accuracy of the plug, the line pressure is not necessarily constant, and is not necessarily constant at the shift point already determined in the design or at the required shift point. It is difficult to adjust the engagement pressure. If these variations in the accuracy of the spring and the accuracy of the plug are left unaddressed, errors will occur in the engagement timing of the frictional engagement elements, etc. in response to fluctuations in line pressure. For example, one possible method is to supply line pressure to the accumulator in order to adjust the engagement timing, but since this adjustment is designed on the assumption that the line pressure is in a stable state, As a result, the engagement timing may be shifted. In particular, the engagement timing of the forward clutch during an N-D shift or the engagement timing of the reverse clutch during an N-R shift becomes difficult to adjust as line pressure fluctuates, and a shock may occur. Therefore, the present invention reduces the biasing force of the spring by providing a structure in which the plug that biases the spring can be adjusted in stages, regardless of errors in the precision of the spring and the precision of the plug. An object of the present invention is to provide a hydraulic pressure adjustment device for a hydraulic control device for an automatic transmission, which can be adjusted in response to spring manufacturing errors and can generate appropriate line pressure.

[Means for Solving the Problems] The hydraulic pressure adjustment device of the hydraulic control device for an automatic transmission of the present invention includes a valve body, a valve hole formed in the valve body, and a valve body slidably fitted into the valve hole. A spool, a spring placed behind the spool, a plurality of radial grooves with different depths on the outer surface, and a locking groove formed approximately at the center, which is slidably fitted into the inlet of the valve body hole. a plug having an inner surface that comes into contact with the spring; a recess for inserting a key formed near the entrance of the valve body hole; and a plug that is inserted into the recess and is locked in a groove on the outer surface of the plug. The line pressure is generated by controlling the discharge of hydraulic pressure from a hydraulic source, and the position of the groove formed on the outer surface of the key and the stopper that abuts the key is adjusted via the locking groove. , characterized in that the spring load is adjusted by rotating the stopper.

[Operations and Effects] The hydraulic pressure adjustment device of the hydraulic control device for an automatic transmission of the present invention is slidably fitted into the entrance portion of the valve body hole, and has a plurality of radial grooves with different depths on the outer surface and a groove approximately at the center. a locking groove formed in the hole, a plug having an inner surface that comes into contact with the spring, a recess for inserting a key formed near the entrance of the valve body hole, and a key insertion recess formed in the vicinity of the entrance of the valve body hole; Since it has a key that locks into the groove on the side, the set line pressure can be easily adjusted to the locking groove of the stopper using, for example, a screwdriver, regardless of the accuracy of the spring, and the line pressure can be adjusted easily. By adjusting the discharge control of, for example, the hydraulic pressure to the frictional engagement element can be stably controlled to be supplied and discharged regardless of errors in the accuracy of the spring or the accuracy of the stopper, and especially for N-D shift. This makes it possible to prevent deviations in the engagement timing of the forward clutch during a shift, or in the engagement timing of a reverse clutch during an NR shift.

Furthermore, spring errors and plug errors can be adjusted by simply replacing the plug without making any major changes to the conventional line pressure adjusting device.

[Embodiment] Next, a hydraulic pressure adjustment device for a hydraulic control device for an automatic transmission according to the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 shows a hydraulic control device for an automatic transmission to which the hydraulic pressure adjustment device for a hydraulic control device for an automatic transmission of the present invention is applied.

The line pressure regulating valve (regulator valve) includes a valve hole 1A with a circular cross section formed at a predetermined position in the body 1;
A first valve fixed in the valve hole 1A with a stopper member 3.
A cylinder 4, a pillar-shaped or plate-shaped key 5 inserted into a key insertion recess 5A formed in the vicinity of the entrance of the valve hole 1A, which is a groove or a hole, etc., is tightly fitted to the entrance of the valve hole 1A as shown in the figure. a plug 6 which is slidably fitted and fixed with the key 5; a second biased member which is slidably fitted into the second cylinder 4 and whose one end abuts the first spool 2; It consists of a spool 7, a first spring 8 disposed between the first spool 2 and the first cylinder 4, and a second spring 9 disposed behind the second spool 7 and the plug 6.

As shown in FIG. 2, the plug 6 has a plurality of radial grooves A with different depths, which are arranged at different distances from the inner surface 62 on the outer surface 61 of the engaging surface with the key 5. B, C, D, and E, and by rotating the stopper 6, the key 5 is engaged with one of the plurality of grooves. F is a groove for an adjustment screwdriver, insert the screwdriver into the groove F,
By rotating it, the engagement position of the groove can be changed.

This line pressure regulating valve inputs pressure oil (input oil pressure) guided by an oil pump 11 from an oil reservoir 10 and outputs pressure oil (feedback oil pressure) acting on an oil chamber 12 and oil via a throttle valve 20. Line pressure is generated in the oil passage 15 by the balance between the throttle pressure acting on the chamber 13, the line pressure acting on the oil chamber 14 through the manual valve 30 during reverse movement, and the forces of the springs 8 and 9. The line pressure of the oil passage 15 is communicated to the manual valve 30, and further to the throttle valve 2.
0, connected to the frictional engagement device 40. In this case, since the spring load (spring force) applied by the spring 8 to the first spool 2 can be adjusted by rotating the plug 6, the discharge control of the line pressure can be adjusted regardless of the error in the accuracy of the spring and the accuracy of the plug. By doing this, for example, the hydraulic pressure to the frictional engagement element can be stably controlled in supply and discharge regardless of errors in spring accuracy and plug accuracy, and is particularly effective for forward clutches during N-D shifts. It is possible to prevent deviations in the engagement timing of the clutch or the engagement timing of the reverse clutch during the N-R shift.

Furthermore, spring errors and plug errors can be adjusted by simply replacing the plug without making any major changes to the conventional line pressure adjusting device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a line pressure regulating valve to which the present invention is applied, and FIG. 2 is a diagram showing a second cylinder, which is the first member. DESCRIPTION OF SYMBOLS 1... Valve body, 1A... Valve hole, 2... First spool, 3... Stopper member, 4... First cylinder, 5... Key, 6... Plug, 7... Forced member. Second spool, 8...first spring,
9...Second spring, 10...Oil sump, 11...
...Oil pump, 12...Oil chamber, 13...Oil chamber, 14
... Oil chamber, 15 ... Oil passage, 20 ... Throttle valve, 30 ... Manual valve, A, B, C, D, E
...groove, F...locking groove.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve body, a valve hole formed in the valve body, a spool slidably fitted into the valve hole, a spring placed behind the spool, and an inlet of the valve body hole. a plug that is slidably fitted into the valve body hole and has a plurality of radial grooves with different depths on an outer surface, a locking groove formed approximately in the center, and an inner surface that abuts the spring; It consists of a key insertion recess formed near the entrance of the stopper, and a key inserted into the recess and locked in a groove on the outer surface of the stopper, and controls the discharge of hydraulic pressure from the hydraulic source. The spring load is adjusted by generating line pressure and rotating the plug through the locking groove and the position of the groove formed on the outer surface of the plug that contacts the key. A hydraulic adjustment device for a hydraulic control device for automatic transmissions.