KR20050010644A - A hydraulic pump with a pressure boosting device - Google Patents

Abstract

The present invention relates to a hydraulic apparatus having a high pressure generating device, which is easy to change the flow path in the high pressure generating device when a high pressure is required in a piston pump type hydraulic device that generates hydraulic pressure by sequentially operating a plurality of pistons by an inclined cam. To generate high pressure.

The present invention is a piston pump hydraulic system having a plurality of pistons arranged radially and a cylinder block formed with a suction chamber, the flow paths connecting the suction chambers are divided into two groups, the flow path connecting each group Characterized in that the flow path blocking means is provided. In addition, one of the groups is characterized in that the discharge pipe is connected to the other group is connected to the leak pipe through the leak control means (flow rate and pressure). In addition, the suction pipe and the suction pipe opening and closing means are provided in each suction chamber, and the flow path opening and closing means is provided in the flow path connected to each suction chamber. According to the present invention, when the high pressure is required, the high pressure is generated by closing the flow path of one group of the group by operating the flow path blocking means using the leak control means.

Description

A hydraulic pump with a pressure boosting device

The present invention relates to a hydraulic device having a high pressure generating device, and when a high pressure is required in a piston pump type hydraulic device including a cylinder block having a plurality of pistons, a suction cylinder, a flow path, and the like, the flow path in the cylinder block is changed. High pressure is easily generated.

In the conventional piston pump hydraulic system, a drive shaft is installed in a pump housing, a suction pump and a cam are installed on the shaft, and the drive shaft is connected to a drive source such as a motor or an engine. In the pump housing is formed a suction chamber is provided with a plurality of pistons driven according to the profile of the cam, the suction chamber is connected to the flow path connected to the discharge pipe discharges the sucked fluid at high pressure. In the conventional piston pump, as the drive shaft rotates, the suction pump and the cam rotate, and accordingly, the piston reciprocates linearly by the profile height difference of the cam to suck or compress the fluid.

Therefore, in the conventional hydraulic system, the maximum hydraulic pressure that can be generated is determined according to the maximum rotation speed of the drive shaft, the stroke distance of the piston, and the capacity of the suction pump. In order to increase the pressure of the fluid, such a conventional piston pump hydraulic device has to increase the rotational speed of the drive shaft or increase the cam height difference of the cam to increase the piston stroke distance or increase the capacity of the suction pump. However, these methods have a problem of reducing vibration or shaft durability by increasing the rotational speed, increasing the cam profile height difference increases the hydraulic pressure, and increasing the pump capacity causes a problem of miniaturizing the hydraulic pressure. there was. In addition, the high pressure generation method using the pressure booster pump using the Pascal principle requires a hydraulic pump, a hydraulic valve, an oil tank, etc., and the device becomes large. There is a problem that requires an auxiliary device.

In order to solve the above-mentioned problems, it is an object of the present invention to easily obtain a high pressure without a large capacity of a separate hydraulic device or hydraulic device, and at the same time improve the compactness of the hydraulic device and the mobility of the hydraulic device. It is aimed.

1 is an exploded perspective view of a hydraulic apparatus according to the present invention;

Figure 2 is an operating state of the hydraulic device according to the invention,

3 is a hydraulic circuit diagram of a hydraulic apparatus according to the present invention.

<Description of Symbols for Major Parts of Drawings>

10: drive shaft 20: inclined cam

30: suction pump 100: cylinder block

110: suction chamber 120: axle shaft

130: outlet 150: suction chamber opening and closing means

160: euro opening and closing means 170: euro blocking means

180: leak control means

In order to achieve the above object, the present invention provides a piston pump type hydraulic apparatus including a cylinder block having a plurality of pistons, a suction chamber, a flow path, and the like, and includes a means for easily changing the flow path in the cylinder block. It is easily generated.

The present invention is a piston pump hydraulic device having a plurality of pistons and a cylinder block formed with a suction chamber, the flow path connecting the suction chamber is divided into two groups, the flow path connecting each group is provided with a flow path blocking means In addition, one of the groups is characterized in that the discharge pipe is connected to the other group is connected to the leak pipe through the leak control means (flow and pressure). In addition, the suction pipe and the suction chamber opening and closing means are installed in each suction chamber, and the flow path opening and closing means is provided in the passage connected to each suction chamber. According to the present invention, when the high pressure is required, the high pressure is generated by closing the flow path of one group of the group by operating the flow path blocking means using the leak control means.

Hereinafter, an embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

Hydraulic apparatus of the present application and the drive shaft 10 is connected to the drive source (not shown);

An inclined cam 20 connected to the drive shaft 10;

A cylinder block (100) in which the inclined cam (20) is installed and a suction chamber (110), an outlet (120) and a leak hole (130) are formed;

It is installed on the suction chamber 110 side of the cylinder block and includes a suction pump 30 connected to the drive shaft (10).

A plurality of pistons 111 and a suction chamber 110 are radially arranged in the cylinder block, and the piston 111 is in contact with the inclined cam 20 in the suction chamber 110 to perform a linear reciprocating motion in the suction chamber. ) Is installed, and the suction chamber opening and closing means 150 operated by the piston 111 is provided, and a suction pipe 112 connected to the suction pump is installed. As an embodiment of the suction chamber opening and closing means is a ball valve composed of a ball 151, a spring 152, a support plate 153, the spring 152 is supported by the support plate 153 and at the same time The piston 111 and the ball 151 elastically supports. The ball valve of this configuration acts to open and close the suction chamber 110 by the spring force and the piston operation when the piston 111 makes a straight reciprocating motion in the suction chamber by the inclined cam 20.

The inclined cam 20 is provided with a thrust bearing therein is composed of a rotating portion that rotates like the drive shaft 10 and a non-rotating portion that does not rotate. When the inclined cam 20 rotates, the non-rotating portion contacts the piston 111 so that the non-rotating portion moves zigzag along the profile of the cam 20. Accordingly, the pistons 111 linearly reciprocate in the suction chamber 110 along the profile of the inclined cam 20.

In the cylinder block 100, flow paths connecting the plurality of suction chambers 110 are separated into two groups as shown in FIG. 3, and flow path blocking means 170 is provided in the flow path connecting each group. In addition, one group (first group) of the group is connected to the outlet port 120 and the other group (second group) is connected to the outlet port 130 through the leak control means 180 for respectively or simultaneously adjusting the flow rate and pressure. Connected. In addition, the flow path opening and closing means 160 is provided in the flow path connected to each suction chamber 110. The flow path blocking means 170 and the flow path opening and closing means 160 may be a ball valve type consisting of a ball and a spring.

Referring to the operation of the present invention, when the drive shaft 10 is rotated by a drive source such as a motor or an engine, the suction pump 30 and the inclined cam 20 connected to the drive shaft 10 is operated. As shown in FIG. 2, the suction discharge action of the suction chamber 110 is the action of the suction chamber opening and closing means 150 operated by the piston 111 and the flow path opening and closing means 160 installed in the passage connected to the suction chamber 110. Is caused by.

When the inclined cam 20 is the lowest point L, the suction chamber opening and closing means 150 that is blocking the suction pipe 112 by the fluid pressurized by the suction pump 30 is opened to the suction chamber 110. Fluid enters. At the same time, the piston 111 is pushed until it comes in contact with the inclined cam 20, the pressure in the suction chamber 110 is dropped, thereby closing the flow path opening and closing means 160 installed in the connection flow path. When the inclined cam 20 is the highest point H, the piston 111 is pushed into the suction chamber 110 by the inclined cam 20 and at the same time the pressure in the suction chamber 110 increases. Accordingly, the suction chamber opening and closing means 150 blocks the suction pipe 112 and at the same time, the flow path opening and closing means 160 installed in the connection passage is opened to discharge the fluid in the suction chamber 110.

Normally high pressure is not required to close the leak port 130 so that all the fluid introduced into the suction chamber 110 is discharged to the outlet 120. Since the hydraulic pressure of the fluid introduced into the group (second group) connected to the leak port 130 is high enough to open the flow path blocking means 170 in the state where the leak port 130 is closed, the first group and the second group The flow path of the group is connected so that the fluid of the first and second groups are all discharged to the outlet 120.

However, when high pressure is required, the leakage control means 180 is adjusted to allow a part of the fluid introduced into the group (second group) connected to the leak port 130 to leak. When some fluid leaks into the leak port 130, the hydraulic pressure acting on the flow path blocking means 170 is lowered to close the flow path blocking means 170. As a result, the connection flow path between the first group and the second group is broken. At this time, the amount of leaking fluid or the pressure should be adjusted only to the extent that the flow path blocking means 170 is closed. If the leakage amount of the second group is greater than the proper value, the hydraulic pressure of the outlet 120 may be lowered. When the connection flow path between the first group and the second group is cut off, most of the fluid flowing into the second group is not discharged and these non-drained fluids must be discharged through the first group. For example, when three suction chambers 110 are provided in one group as shown in FIG. 3, six suction chambers 110 share a certain amount of fluid per unit time supplied by the suction pump 30. However, if the second group does not discharge the fluid, the three suction chambers 110 share the same amount of fluid per unit time. Therefore, the flow rate per unit time discharged per one inlet is increased and thus the hydraulic pressure discharged is increased.

As described above, the present invention allows the user to easily obtain high pressure without increasing the capacity of a separate hydraulic device or hydraulic device, and at the same time provides an effect of miniaturizing the hydraulic device and improving the mobility of the hydraulic device.

Claims (5)

A drive shaft 10 connected to the drive source; An inclined cam 20 connected to the drive shaft 10; A cylinder block (100) in which the inclined cam (20) is installed, a discharge port (120) and a leak hole (130) are formed, and a plurality of suction chambers (110) in which a piston (111) is installed; In the piston pump type hydraulic apparatus including a suction pump 30 is connected to the drive shaft 10 and installed in the suction chamber 110 side of the cylinder block, flow path blocking means for blocking the flow path in the cylinder block (170) It is provided with a high pressure generating hydraulic pump to easily generate a high pressure. The hydraulic pump for high pressure generation according to claim 1, wherein the flow paths connecting the suction chambers are separated into two groups, and the flow path blocking means is installed in the flow paths connecting the groups. 3. The high pressure generating hydraulic pump according to claim 2, wherein the discharge pipe is connected to one of the groups and the leak pipe is connected to the other group through the leak control means (180). The high pressure generating hydraulic pump according to claim 1, wherein the suction chamber opening and closing means (150) is installed in each suction chamber. The hydraulic pump for high pressure generation according to claim 1, wherein the flow paths connected to each suction chamber are provided with flow path opening and closing means (160).