JPH0317062Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a throttle device for a pressure oil supply path whose output is an actuator such as a hydraulic clutch incorporated in a transmission device.

(B) Prior Art Conventionally, in the supply path for supplying pressure oil to actuators such as hydraulic clutches, the flow rate has often been adjusted or appropriately throttled for a predetermined purpose.

In such cases, specialized equipment, i.e.
This purpose was achieved by installing flow control valves and throttle valves.

(c) Problems that the invention aims to solve However, there are various types of actuators.
The functions of the pressure oil required for these actuators are not uniform, and even the same actuator may be required to have different functions depending on the type of work.

In such cases, existing commercially available devices are often insufficient to provide optimal functionality and are also costly.

(d) Means to solve the problem Therefore, in this invention, a closed chamber is formed at the upstream end of the downstream pressure oil supply path leading to the actuator of the hydraulic clutch, and a piston that moves a certain stroke is inserted into this closed chamber. In addition, the end of the upstream pressure oil supply path is exposed to the side surface of the piston, and there is a passage in the piston that communicates with the closed chamber and the upstream pressure oil supply path, and a passage that communicates with this passage and connects to the downstream pressure oil supply path. In the pressure oil supply paths each forming a throttle passage that communicates with the piston, the pressure receiving area on the closed chamber side of the piston is made larger than the pressure receiving area on the downstream pressure oil supply route side, and the diameter of the throttle passage is set to be larger than the pressure receiving area on the downstream pressure oil supply route side. The above-mentioned problems have been solved by providing a throttle device for the pressure oil supply path that is smaller than the diameter of the passage.

(E) Effect As a result, when pressure oil flows in the forward direction (when trying to operate the actuator), the piston moves toward the downstream pressure oil supply path, and as a result, pressure oil overflows into the closed chamber, thereby delaying the supply to the actuator and slowing down the operation of the actuator. On the other hand, when the pressure oil flows in the reverse direction (when trying to stop the operation of the actuator), the throttle passage leading from the downstream pressure oil supply path, which is the pressure oil passage, to the upstream pressure oil supply path. Since the diameter of the passage leading from the closed chamber to the upstream pressure oil supply path is larger than the diameter of the passage, the difference in flow resistance causes the piston to move toward the closed chamber. The volume of the downstream pressure oil supply path increases accordingly, and the pressure of the pressure oil applied to the actuator drops rapidly, causing its operation to stop instantaneously.

(F) Example Hereinafter, an example of this invention will be explained with reference to the drawings. Figures 1 and 2 are sectional views of the main parts of the throttle device according to this invention, and Figure 3 is a sectional view of the transmission device. It is a partially sectional view.

In the transmission device, a transmission shaft 2 is pivotally supported in a transmission case 1, and a transmission wheel body 3 such as a gear is fitted onto the transmission shaft 2.
How many actuators (in this example, a hydraulic clutch is used, but similar devices include hydraulic brakes, etc.) 4 are installed between the and the transmission shaft 2 (two in this example)?
It has been intervened.

The hydraulic clutch 4 constitutes a kind of hydraulic cylinder, and when pressure oil is sent to the positive pressure chamber 4a through the pressure oil supply path 5 formed in the transmission shaft 2, the piston 6 moves and the clutch plate 7 are joined, and power is transmitted from the transmission wheel body 3 to the transmission shaft 2. On the other hand, when the oil supply is stopped, the piston 6 returns to its original position due to the action of the spring 8 provided in the back pressure chamber 4b, the clutch plate 7 is disconnected, and the power transmission is also cut off (therefore, This hydraulic clutch 4 is a single-acting type).

On the other hand, a supply device 9 for supplying pressure oil to a supply path 5 formed inside the transmission shaft 2 is provided at the shaft end of the transmission shaft 2, and another supply path is also provided inside this supply device 9. 10 is provided, and this supply path 10 and the supply path 5 inside the transmission shaft 2 are communicated with each other.

The back pressure chamber 4b of the hydraulic clutch 4 is communicated with an oil passage 11 through which low-pressure oil flows to ensure the return of the piston 6 and to also serve as lubrication.

By the way, in this invention, the above pressure oil supply path, for example, a downstream pressure oil supply path 10b leading to the actuator 4 is formed in the middle of the supply path 10 to the supply device 9, and its upstream end is closed. is defined as the closed chamber 16. A piston 14 that moves a constant stroke toward the downstream pressure oil supply path 10b is inserted into the closed chamber 16, and the upstream pressure oil supply path 10a is joined to the side surface of the piston 14. In addition, the piston 14 has a two-stage structure in which the diameter on the side of the closed chamber 16 is larger, and the piston 14 has a two-stage structure in which the diameter on the side of the closed chamber 16 is larger.
Make sure that the stroke is limited by making them come into close contact with each other. On the other hand, inside the piston 14 is a passage 12 that communicates with the upstream pressure oil supply path 10a and the closed chamber 16.
a, and a throttle passage 12b which communicates with this passage 12a and which also communicates with the downstream pressure oil supply path 10b are formed. However, the diameter of the throttle passage 12b is made smaller than the diameter of this passage 12a. Further, in this case, the pressure receiving area of the piston 14 is also set to be larger on the side of the closed chamber 16 than on the side of the downstream pressure oil supply path 10b.

As described above, when the pressure oil flows in the forward flow direction, the piston 14 moves toward the downstream pressure oil supply path 10b due to the difference in the pressure receiving area of the piston 14. When the piston 14 moves in this direction, the pressure oil flows into the closed chamber 16 side, and the amount flowing into the downstream pressure oil supply path 10b is reduced by that amount only during the initial period, and the actuator 4 operates slowly. On the other hand, if the supply limit pressure of pressure oil is reduced, the pressure oil will flow backwards, but at this time, the diameter of the throttle passage 12b is larger than the diameter of the pressure oil supply path 10a on the upstream side from the blockage chamber 16.
Because the diameter of the passageway 12a leading to
Move to the side. When the piston 14 faces in this direction, the volume of the downstream pressure oil supply path 10b increases, and the operation of the actuator 14 stops without delay (therefore, the volume of the downstream pressure oil supply path 10b increases, that is, the piston Even a slight movement of 14 produces this effect). In addition, piston 14
By providing a blind cover 15 on the upstream external side of the downstream pressure oil supply path 10b in which the piston 14 is fitted, it serves as an adjusting member for the slide stroke of this piston 14, and also serves as a member for adjusting the slide stroke of the piston 14. It can also be used as a lid.

(g) Effects of the invention As mentioned above, the engagement of the hydraulic clutch is delayed by a certain period of time, and since it starts operating at a low speed, the shock during engagement is absorbed, and the disengagement is instantaneous, so the engagement of the clutch is reduced. This will result in optimal functionality. Therefore, if this is used in an automatic transmission device of a traveling working machine, etc., smooth shifting can be achieved and the ride is comfortable. Furthermore, this piston has a simple shape as described above and is easy to assemble, so it can be manufactured at low cost. Furthermore, as described above, by branching the supply path into a T-shape and inserting this piston into the blind cover that covers the outside, it can be easily removed when not needed.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention.
FIG. 2 is a sectional view of a main part of the throttle device according to this invention, and FIG. 3 is a partial sectional view of the transmission device. (Symbol) 4...actuator, 10...pressure oil supply path,
10a...upstream pressure oil supply route, 10b...downstream pressure oil supply route, 12a...passage, 12b...throttle passage, 14...piston, 16...closed chamber.

Claims (1)

[Claims for Utility Model Registration] A closed chamber 16 is formed at the upstream end of the downstream pressure oil supply path 10b leading to the actuator 4 of the hydraulic clutch, and a piston 14 that moves at a constant stroke is inserted into this closed chamber 16. The end of the upstream pressure oil supply path 10a faces the 14 side, and inside this piston 14 there is a passage 12a that communicates with the closed chamber 16 and the upstream pressure oil supply path 10a, and a passage 12a that communicates with this passage 12a and that connects the downstream pressure oil supply. Route 10b
In the pressure oil supply paths each forming a throttle passage 12b that leads to Passage 12b
The diameter of the passage 12a is smaller than the diameter of the passage 12a.