JPH0323419Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a pulsation absorbing device that absorbs pulsation of oil discharged from a pump.

<Prior art> Oil discharged from a vane pump has pulsation, and one measure to reduce this pulsation is to use a rubber hose with a built-in intermediate restrictor or spiral pipe in the piping connecting the pump and the power steering device. ing.

<Problems to be solved by the invention> The rubber hose requires a certain length in order to absorb pulsation, and the piping must be routed in consideration of the length of the rubber hose. It took a lot of effort to move the parts around, and extra space was needed to move them around.

<Means for solving the problems> In order to solve the above-mentioned problems, the present invention forms a hollow space communicating with the pipe inside the eye union to which the pipe is fixed, and inserts the pipe through this hollow space. The threaded member that is threaded onto the discharge port is provided with a stepped portion that abuts the end face of the eye union, and the threaded member is provided with a small diameter hole that communicates with the discharge port and the small diameter hole and the hollow space of the eye union. A bolt that forms a communicating valve space and closes the valve space is screwed onto one end of the valve space, and a variable space portion that is partially constituted by the end face of the bolt and communicates with the small diameter hole via a throttle passage is provided. An elastic member is provided in the valve space with a valve that changes the volume of the variable space portion and changes the area of communication between the small diameter hole and the valve space, and biases the valve in a direction in which the communication area between the small diameter hole and the valve space becomes smaller. It has been established.

<Function> With the above configuration, the pulsation of oil discharged from the pump acts on one surface of the piston, and the pressure of the oil rectified by the throttle passage acts on the other surface. When a portion of high pulsation pressure acts on the piston, the piston overcomes the elastic force of the elastic member and moves in a direction to expand the volume on the side where the pulsation acts, and when a portion of low pulsation pressure acts on the piston, the piston moves Due to the elastic force of the elastic member, the volume on the side where the pulsation acts moves in a direction to reduce, thereby absorbing the pulsation.

<Examples> Examples of the present invention will be described below based on the drawings. In FIG. 3, reference numeral 10 denotes a pump device attached to the side wall of the engine (not shown), and a reservoir tank 11 is installed on the pump device 10 to temporarily store oil from a power steering device (not shown). As shown in FIG. 1, 12 is a pump device 10.
Pressure oil is discharged to the outside from this discharge port 12. The discharge port 12 is provided with a connecting device 21 for connecting one end of a pipe 20 connected to the power steering device to the discharge port 12.
is fixed.

This connecting device 21 includes a screwing member 22 screwed onto the discharge port 12, an eye union 24 which is pressed between a stepped portion 23 formed in the screwing member 22 and the pump device 10, and an eye union 24 inside the screwing member 22. The pulsation absorbing mechanism 25 is provided in the pulsation absorbing mechanism 25.

A small diameter hole 30 communicating with the passage 13 on the side of the discharge port 12, a fitting hole 31, a valve space 32 with a larger diameter than the fitting hole 31, and a screw hole 33 are continuously formed in the screwing member 22. . A cylindrical member 34 having a flow path 34a formed therein is fitted and fixed into the fitting hole 31,
A groove 35 is formed in one end of the cylindrical member 34 in the radial direction. A bolt 36 is screwed and fixed into the screw hole 33, and one end of a metal bellows (elastic member) 37 is in contact with the bolt 36. bellows 3
A piston (valve) 38 that is slidably fitted into the valve space 32 is fixed to the other end of the valve 7;
This piston 38 has a flow passage 34a and a bellows 37.
A throttle passage 39 is formed that communicates with the variable space inside. The bellows 37 has an elastic force large enough to absorb pulsation, and the bellows 37, piston 38, and throttle passage 39 function as the pulsation absorption mechanism 2 described above.
5 is composed. The cylindrical member 34 and the valve space 32
A first annular passage 40 is formed between the first and
A through hole 41 communicating with the annular passage 40 is formed in the radial direction of the screw member 22. This through hole 4
A second annular passage 42 communicating with the eye union 24 is formed between the eye union 24 and the screw member 22, and one end of the pipe 20 described above is fixed to the eye union 24 so as to communicate with the second annular passage 42. . Small diameter hole 30, flow path 34a, groove 35, first annular passage 4
0, the through hole 41, and the second annular passage 42 constitute a communication passage 43.

Next, the operation will be explained based on the above-described configuration. The oil discharged from the pump device 10 flows through the passage 13, the small diameter hole 30, the flow passage 34a, the groove 35, the first annular passage 40, the through hole 41, and the second annular passage 4.
2. It is led to the power steering device via the pipe 20.
The pressure of the oil that pulsates in the middle is the piston 38.
The pressure of the oil rectified by the throttle passage 39 acts on the other surface of the piston 38. The pulsating oil has high pressure areas and low pressure areas alternately in the flow direction, and when the high pressure areas act on the piston 38, the elastic force of the bellows 37 is overcome and the piston 38 moves to the right in FIG. do. As the piston 38 moves to the right, the volume on the flow path 34a side expands, and the pressure in the high pressure area drops until it becomes comparable to the pressure inside the bellows 37. Conversely, the part with low pressure is the piston 38
, the elastic force of the bellows 37 causes the piston 38 to move to the left. As the piston 38 moves to the left, the volume on the flow path 34a side is reduced,
The pressure increases until the pressure in the low pressure area reaches the same level as the pressure inside the bellows 37. By causing the piston 38 to follow the pulsating oil pressure change in this way, the pulsating is absorbed, and the rectified oil pressure is guided to the pipe 20.

The above-described embodiment has a configuration in which pulsation is absorbed by the operation of the piston 38, so the piping connecting the discharge port 12 of the pump device 10 and the power steering device is routed according to the pump device 10.
It is only necessary to consider the position of the discharge port 12 and the position of the power steering means, making it easy to route the piping, and no extra space is required for the piping. Further, the pulsation absorbing mechanism 25 can be easily attached by screwing the threaded member 22 into the discharge port 12 of the pump device 10. Furthermore, the pressure of the oil discharged from the pump device 10 is reduced to the bellows 37 of the piston 38 via the constriction passage 39.
Since it is always acting on the side surface, it is possible to absorb pulsations in all pressure ranges. By loosening the bolt 36, the pulsation absorbing mechanism 25 can be easily overhauled, such as replacing the piston 38 and the bellows 37.

As another modification, as shown in FIG. 2, a piston 52 is slidably inserted into a cylinder chamber 51 formed in a bolt 50, and the communication area that communicates the small diameter hole and the valve space at one end of the piston 52 is changed. A valve is provided between the bolt 50 and the piston 52.
A spring 54 is inserted to press the spring 54 toward the cylindrical member 53, a passage 55 is formed that communicates the variable space on the spring 54 side with the chamber on the cylindrical member 53 side, and a throttle member 56 is provided in the passage 55. But it's okay.

<Effects of the invention> As described above, the present invention has a structure in which the oil pulsation is absorbed by the operation of the piston, so the piping connecting the pump device's discharge port and the power steering device can be easily connected. For the routing, only the position of the discharge port of the pump device and the position of the power steering device need to be considered, and the routing of the piping becomes easy and no extra space is required for routing the piping. Further, there is an advantage that the pulsation absorbing mechanism can be easily attached by simply fixing the connecting device to the discharge port of the pump device. The advantage is that the pulsation absorbing mechanism can be easily overhauled, such as replacing the piston and elastic member, by holding it by loosening the bolt.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an enlarged sectional view of a connecting device, FIG. 2 is an enlarged sectional view of a connecting device showing another modification, and FIG. 3 is a partial sectional view of a pump device. External view. 10...Pump device, 12...Discharge port, 2
0... Pipe, 21... Connecting device, 22... Screwing member, 24... Eye union, 25... Pulsation absorption mechanism, 32, 51... Cylinder chamber, 36, 50...
... Bolt, 37 ... Bellows, 38, 52 ... Piston, 39 ... Restriction passage, 43 ... Communication passage, 5
4... Spring, 55... Passage, 56... Throttle member.

Claims (1)

[Scope of utility model registration request] A connecting device with a pulsation absorbing mechanism that absorbs pulsations of oil discharged from the pump is provided in a connecting device that connects a pipe connected to an actuating device to a pump device, the connecting device having a pulsation absorbing mechanism that absorbs the pulsation of oil discharged from the pump, and an eye to which the pipe is fixed. A hollow space that communicates with the pipe is formed inside the union, and a step that comes into contact with the end surface of the eye union is formed on the threaded member that is inserted through this hollow space and screwed onto the discharge port. A small diameter hole that communicates with the discharge port and a valve space that communicates with the hollow space of the eye union are formed in the mounting member, and a bolt that closes this valve space is screwed onto one end of the threaded member. , a variable space part is formed partially by the end face of the bolt and communicates with the small diameter hole via a throttle passage, and the volume of the variable space part is changed and the area of the passage leading from the small diameter hole to the valve space is changed. 1. A connection device with a pulsation absorbing mechanism, characterized in that a valve is movably provided in a valve space, and is provided with an elastic member that biases the valve in a direction in which a passage area leading from a small diameter hole to the valve space becomes smaller.