JPH0198957U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram showing a state in which the R range is established in the hydraulic control circuit of an automatic transmission according to an embodiment of the present invention. FIG. 2 is a hydraulic circuit diagram showing a state in which the N range is established in the hydraulic control circuit of FIG. 1. FIG. 3 is a hydraulic circuit diagram showing a state in which the P range is established in the hydraulic control circuit of FIG. 1. 4 is a plan view of a valve body used in the hydraulic control circuit of FIG. 1. FIG. FIG. 5 is a sectional view taken along the line -- in FIG. 4 in a state where other hydraulic control elements are assembled to the valve body, corresponding to the state in which the R range is established in FIG. 1. 6th
The figure is a sectional view taken along the line -- in FIG. 4. FIG. 7 is a sectional view taken along the line -- in FIG. 6. FIG. 8 is a sectional view taken along the line -- in FIG. 4. Figure 9 shows
FIG. 4 is a sectional view taken along the line -- in FIG. 4 in a state where other hydraulic control elements are assembled to the valve body, corresponding to the N range and P range established states of FIGS. 2 and 3; FIG. 10 is a sectional view taken along the line -- in FIG. 4. Figure 11 shows - in Figure 10.
FIG. FIG. 12 is a sectional view taken along the line -- in FIG. 4. 1...Manual valve, 4...Spool, 6...Pressure oil supply port, 7...1st reverse servo side pressure oil discharge port (pressure oil discharge port), 8...2nd reverse servo side pressure oil discharge port, 9...Reverse servo opposite Side pressure oil discharge port (discharge port), 10... throttle, 17... third land.

Claims (1)

[Claims for Utility Model Registration] (1) In a hydraulic control device for an automatic transmission equipped with a spool valve that controls a reverse servo, the spool valve is configured to supply pressure oil to the reverse servo via a throttle. A pressure oil discharge port, which is arranged in the axial direction of the spool valve so that it can communicate with the exhaust pressure port of the spool valve away from the pressure oil supply port, and which communicates with the reverse servo without going through the throttle; When the transmission shifts to the R range, the pressure oil supply port is opened and at the same time the pressure oil discharge port is closed to the pressure oil discharge port, and when the automatic transmission is released from the R range, the pressure oil discharge port is closed to the pressure oil discharge port. A hydraulic control device comprising: a spool provided with a land that communicates a pressure oil discharge port with the exhaust pressure port. (2) A request for registration of a utility model characterized in that the pressure oil discharge port and the exhaust pressure port are located at the same position in the axial direction of the spool valve, and at positions separated from each other in the circumferential direction of the cross section of the spool valve. The hydraulic control device according to item 1. (3) Another pressure oil discharge port connected to the reverse servo via the throttle is arranged so as to be able to communicate with the pressure oil discharge port, and is opened and closed almost simultaneously with the pressure oil discharge port by the land of the spool. A hydraulic control device according to claim 1 or 2 of the utility model registration claim, characterized in that: