JPH0325069U

JPH0325069U -

Info

Publication number: JPH0325069U
Application number: JP8544689U
Authority: JP
Priority date: 1989-07-20
Filing date: 1989-07-20
Publication date: 1991-03-14

Description

[Brief explanation of drawings]

第１図は本考案に係る一体構造のチヤージリリ
ーフバルブ兼チエツクバルブを備えた流体変速装
置の全体図、第２図は第１図に示すリテイナーの
斜視図、第３図は上記チヤージリリーフバルブ兼
チエツクバルブの作用原理図、第４図は従来の流
体変速装置の流体回路図である。１……可変容量ポンプ、２……モータ、３……
チヤージポンプ、４……動力源、５……サクシヨ
ンフイルター、６……タンク、１０……チヤージ
リリーフバルブ兼チエツクバルブ、１１……ケー
シング、１２……流入口、１３……還流口、１４
……排出口、１５……弁体、１６……リテイナー
、１７……スプリング、１８Ａ……第１流出口、
１８Ｂ……第２流出口、Ｌ１……閉回路、Ｌ２…
…サクシヨンライン、Ｌ３……吐出ライン、Ｌ４
……分岐ライン、Ｌ５……ドレンライン、Ｌ６…
…還流ライン。 Fig. 1 is an overall view of a fluid transmission device equipped with an integrated structure charge relief valve and check valve according to the present invention, Fig. 2 is a perspective view of the retainer shown in Fig. 1, and Fig. 3 is a diagram showing the charge relief valve mentioned above. FIG. 4 is a diagram showing the principle of operation of the valve and check valve, and is a fluid circuit diagram of a conventional fluid transmission device. 1...Variable displacement pump, 2...Motor, 3...
Charge pump, 4...Power source, 5...Suction filter, 6...Tank, 10...Charge relief valve and check valve, 11...Casing, 12...Inflow port, 13...Recirculation port, 14
... Discharge port, 15 ... Valve body, 16 ... Retainer, 17 ... Spring, 18A ... First outlet,
18B...Second outlet, L1...Closed circuit, L2...
...Suction line, L3...Discharge line, L4
...Branch line, L5...Drain line, L6...
...reflux line.

Claims

[Claims for Utility Model Registration] 1. The variable displacement pump 1 and the fluid motor 2 are connected via a closed circuit L1, and a charge pump 3 for replenishing fluid to the closed circuit is provided, and an inlet port 3a of the charge pump is connected. In a fluid transmission device connected to a tank 6 via a suction filter 5, a charge relief valve 10 is provided in a branch line L4 branched from a discharge line L3 connecting the charge pump to a closed circuit, and a charge relief valve 10 is provided therein.
Connect the reflux line L6 to 8A, and connect the reflux line L6 to
6 is connected to a line L2 between the suction port 3a of the charge pump 3 and the suction filter 5. 2. The variable displacement pump 1 and the fluid motor 2 are connected via the closed circuit L1, and a charge pump 3 for replenishing fluid to the closed circuit is provided, and the inlet port 3a of the charge pump is connected to the tank via the suction filter 5. In the fluid transmission device, a charge relief valve 10A is provided in a branch line L4 branched from a discharge line L3 that connects the charge pump to a closed circuit, and one of the two outflow ports provided in the charge relief valve is provided with a charge relief valve 10A. A reflux line L6 is connected to one first outlet 18A of the
The reflux line L6 is connected to the line L2 between the suction port 3a of the charge pump 3 and the suction filter 5.
On the other hand, a check valve 10B is disposed at the other second outlet 18B to close the check valve when the pressure is below a predetermined pressure, and the outlet of the check valve is connected to the tank via a drain line L5. A fluid transmission device equipped with a charge pump characterized by: 3. The variable displacement pump 1 and the fluid motor 2 are connected via the closed circuit L1, and a charge pump 3 for replenishing fluid to the closed circuit is provided, and the inlet port 3a of the charge pump is connected to the tank via the suction filter 5. 6, a branch line L4 branched from a discharge line L3 that connects the charge pump to the closed circuit is provided with an inlet 12 at the center of the lower end of the substantially cylindrical casing 11, and at the lower side of the circumferential surface. Reflux port 13 in the section
is provided, and a discharge port 14 is provided on the substantially central circumferential surface,
In addition, a substantially cylindrical valve element 15 having an upper end opening is slidably fitted into the casing 11, and a spring 17 is compressed between the valve element 15 and the upper end of the casing to allow the valve element to open the inlet. 12, the valve chamber 15c in the valve body communicates with the reflux port 13 via the first outlet 18A, and an annular protrusion 15e that also serves as a valve seat is provided on the inner peripheral surface of the valve body. A charge relief valve/check valve 10 having an integral structure with a second outlet 18B formed therein is provided, and one of the first outlet 18A of the two outlets provided on the charge relief valve side is connected to the suction filter. One is connected to the inlet of the charge pump via a reflux line L6 that does not pass through the second
A check valve ball 19 is disposed at the outlet 18B, and the ball closes the check valve when the pressure is lower than a predetermined pressure.
A fluid transmission device equipped with a charge pump, characterized in that it is connected to a tank via 5.