JPH0313655Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a retaining device that supports the one-way ball of an air bleed check valve used to discharge air mixed in the hydraulic circuit of an automatic transmission for a vehicle. This relates to a plate (support plate).

(Prior Art) FIG. 5 shows an example of a retaining plate of a conventional air bleed check valve.

(For example, refer to "RL4F02A automatic transaxle maintenance manual" published by Nissan Motor Co., Ltd.) In the figure, 1 is a valve body, and 2 is an oil passage inserted between one valve body 1 and the other valve body (not shown). A separate plate 3 to be formed and separated indicates an oil passage provided in the valve body 1 along the separate plate 2, and communicates with a transmission shift valve and the like. 4 is a ball insertion hole provided in communication with this oil passage 3, 5 is a valve seat formed at the end of this ball insertion hole 4, 6 is a small diameter oil passage connected to this valve seat 5, and 7 is a one-way ball. , 8 is a retaining plate that supports this one-way ball 7;
Reference numeral 9 denotes an opening in the separate plate 2 that communicates with the oil passage 3 and also communicates with a frictional engagement element of the transmission. When air is mixed in this oil passage and an oil flow is applied from the direction of arrow B to fasten the clutch, only the air is discharged to the outside of the control valve because the ball 7 is away from the valve seat 5, and then , since the oil flow flows around the ball 7 and is discharged, the ball 7
is pushed upward and comes into close contact with the valve seat 5, as shown by the chain double-dashed line, to prevent discharge of hydraulic pressure and to send the engagement hydraulic pressure to the friction engagement element.

(Problems to be solved by the invention) Retaining plate 8 of the above-mentioned conventional device
is for supporting the one-way ball 7, but as shown in FIG. 6 which is a bottom view of FIG. 5, the retaining plate 8 spans the opening 9 of the separate plate 2. The oil circulation area is reduced by the area of the retaining plate 8 that occupies the opening area of the opening 9.

In addition, the retaining plate 8 is usually press-stamped, and since it is a very small part, it cannot have high precision in shape and dimensions, and it tends to have gaps between it and the valve body. When the plate 8 is tilted as shown in the two-dot chain diagram, a portion of the plate 8 enters the opening 9, and the flow area of the opening 9 changes significantly depending on the degree of intrusion, resulting in damage to the hydraulic circuit. There was a problem in performance, for example, that the timing of the rise of the fastening force of the frictional fastening element was delayed from the expected state, resulting in unstable gear shifting and engine racing.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, in the retaining plate that supports the one-way ball of the air bleed check valve in the hydraulic circuit, the lower part of the plate is formed into a forked shape. It has a two-legged shape and constitutes a retaining plate for the hydraulic circuit of an automatic transmission.

(Function) As mentioned above, in the present invention, since the lower part of the retaining plate is formed into a bifurcated two-legged shape, the opening 9 is closed due to the existence of the space between the two legs.
The flow area can be increased compared to conventional ones, and a sufficient flow rate can be ensured.

In addition, with the two-legged retaining plate of the present invention, even if the posture changes, the flow area of the opening of the separate plate hardly changes, so the performance of the hydraulic circuit, such as gear shifting shock and engine racing, can be prevented. This stabilizes the shifting characteristics.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. In the figure, the same reference numerals as the above-mentioned reference numerals indicate equivalent parts.

1 to 3 show a first embodiment of the present invention, in which two forked legs 8a, 8b are formed at the bottom of a retaining plate 8, and a space 8c is formed in between. It was established.

FIG. 4 shows a second embodiment of the present invention, in which a protrusion 8d is further provided protruding from the inner lower part of one leg 8a.

As mentioned above, the retaining plate 8 of the present invention
Since the two legs 8a and 8b are located so as to straddle the opening 9 of the separate plate 2, and there is a space 8c between them, the circulation area of the opening 9 can be increased by that much compared to the conventional one. I can do it.

Furthermore, even if the retaining plate 8 is tilted as shown in the two-dot chain diagram, the flow area of the opening 9 hardly increases or decreases as shown in FIGS. 1 and 4, so the stability of the hydraulic circuit is maintained. will improve.

In particular, when the protrusion 8d is provided as shown in FIG. 4, even if the retaining plate 8 is tilted as shown in the chain double-dashed line, the portion that falls into the opening 9 becomes smaller, thereby stabilizing the hydraulic circuit. In other words, gear shifting shock and engine racing can be prevented, and the effect of further improving gear shifting characteristics can be obtained. The fitting distance of the retaining plate 8 into the ball insertion hole 4 is as follows.
The longer it is, the more it is possible to prevent the retaining plate 8 from tilting, and the characteristics can be further stabilized.

(Effect of the invention) As mentioned above, in the present invention, since the lower part of the retaining plate 8 is shaped into a bifurcated two-legged shape, the existence of the space 8c between the two legs 8a and 8b causes As a result, the flow area of the opening 9 can be increased compared to the conventional one, and a sufficient flow rate can be ensured.

In addition, the two-legged retaining plate 8 of the present invention has a structure in which the circulation area of the opening 9 hardly changes even if the posture changes as shown in the two-dot chain diagrams in FIGS. 1 and 4. According to the invention, the effect of stabilizing the flow path performance of the hydraulic circuit can also be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a hydraulic circuit using the retaining plate of the present invention, and Fig. 2 is a -
3A is a front view of the retaining plate of the present invention, FIG. 3B is a side view thereof,
FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG.
The figure is a sectional view of a hydraulic circuit using a conventional retaining plate, and FIG. 6 is a bottom view of its opening. 1... Valve body, 2... Separate plate,
3...Oil passage, 4...Ball insertion hole, 5...Valve seat, 6...Oil passage, 7...One-way ball, 8...Retaining plate, 8a, 8b...Legs, 8c...Vacancy, 8d...Protrusion, 9... Opening.

Claims (1)

[Scope of utility model registration request] In the retaining plate, which supports the one-way ball of the air bleed check valve used to discharge air mixed in the hydraulic circuit to the outside of the valve body, together with the ball insertion hole, and is supported by the separate plate of the valve body, the lower part of the plate is A retaining plate for a hydraulic circuit of an automatic transmission, characterized in that the portion facing the opening of the separate plate has a bifurcated two-legged shape.