JPS6231256Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil motor type hydraulic pump used in a hydraulic tool.

Needless to say, the drive source for the above tool is:
Although various types of hydraulic pumps are used, this idea focuses on the economic efficiency and convenience of driving by borrowing the hydraulic pressure of the work vehicle, specifically the hydraulic pressure for lifting and lowering the bucket on which the worker rides. However, the problem is that the hydraulic pressure for raising and lowering the bucket is low, so it cannot be used as it is as the hydraulic pressure for driving the tool.

Therefore, in this invention, the pressure is increased from a low oil pressure to a high oil pressure and only the high pressure is taken out, thereby making it possible to drive the tool using the oil pressure provided in the above-mentioned work vehicle.

The details of the embodiment will be described below with reference to the drawings.

20 is a hydraulic motor, and the motor 20 is equipped with a port 21 connected to a low oil pressure source P and a port 22 connected to an oil tank T.

In this example, the low oil pressure source P and oil tank T are included in the work vehicle.

A base body 2 that is long in the axial direction is provided on one end surface of the motor 20.
A rotating shaft 24 of the motor 20 is supported within the base body 23, and a swash plate cam 25 is provided at the end of the rotating shaft 24.

On the surface of the swash plate cam 25, a plunger 2 constituting a high pressure generation pump is provided in the axial direction of the base body 23.
A cylinder 28, into which one end of 6, 27 is slidably connected, and which inserts and supports the plungers 26, 27;
29 is a branch path 3 of an oil feed path 30 that connects to the motor 20.
1 and 32, and a discharge valve 33 is provided between one branch passage 31 and the corresponding cylinder 28, and a suction valve 33' is provided between the other branch passage 32 and the corresponding cylinder 29. are interposed, and the branch passage 31 where the discharge valve 33 is located is communicated with the input port 34 for connection to the tool, and the branch passages 31, 32
In between, a valve 35 is interposed which cuts off the communication between the branch passage 31 and the other branch passage 32 due to an increase in the internal pressure of one branch passage 31, which will be described later. Relief valve 36
A trochoid pump 39 is provided around the rotating shaft 24, which is composed of a runner 37 fixed to the shaft 24 and a stator 38 surrounding the runner 37. 40 is connected to the other end of a passage 42 whose one end communicates with another return port 41 for connecting a tool,
In addition, the discharge side 43 of the pump 39 is communicated with the oil return path 44 of the motor 20, thereby forming a drive unit 48. Note that the relief valve 36 is communicated with a negative pressure passage 42.

The branch passages 31 and 32 are communicated with inner and outer double circular grooves 46 and 47 provided in the base body, as shown in FIG. In other words, in this example, the branch path 31 (discharge side)
is communicated with the outer groove 47, and the branch passage 32 (intake side) is communicated with the inner groove 46, and in this example, the branch passages 31 and 32 are provided at four equally divided locations, making both of them a pair.

The drive unit 48 configured as described above is
As shown in FIG. 1, it is used by connecting to an appropriate hydraulic crimping tool 49. In addition, as a means of connection,
The port 34 of the drive unit 48 is connected to the input end 49' of the tool 49 via a hose 50, and the port 41 is connected to the oil relief passage end 49'' of the tool via a hose 50.
1.

According to the configuration of the present invention described above, it has the following effects.

That is, FIG. 2 shows a state in which the tool is free. Now, the motor 20 is driven by the inflow of low pressure oil from the hydraulic source P, and the oil that has flowed into the motor is sent to the oil supply path 30, the branch paths 31 and 32, and the cylinder 20.
8, 29, while in this state both branch roads 3
The valve 35 that opens and closes the branch passages 1 and 32 is open, so the branch passages 31 and 32 are in communication.

Also, by driving the motor 20, the rotation shaft 24
As the swash plate cam 25 rotates, one plunger 27 sucks oil, and the other plunger 26 discharges oil, and the discharged oil reaches the port 34 through the branch passage 31 and controls the hydraulic pressure of the tool 49. circuit, but since this control circuit is set to a non-operating (free) state, the oil is allowed to escape and is thus connected to the relief passage end 49'', hose 51, return port 41, negative pressure passage 42, and trochoid pump. The oil flows back to the suction side 40, discharge side 43, return oil 44, and oil tank T of the tool 39. In other words, when the tool is in a free state, the drive unit 48 operates, but only circulates the oil.

Therefore, when the hydraulic control circuit of the tool 49 is set to the crimping operating state, the internal pressure in the branch passage 31 of the drive unit 48 increases, which closes the valve 35 as shown in FIG. The communication with the branch passage 31 on the discharge side is cut off, and the oil sucked by the suction side plunger 27 is compressed and pressurized exclusively by the discharge side plunger 26, and is sent to the tool via the branch passage 31 and the port 34. The crimp member of the tool is moved forward to crimp an electric wire or the like.

When the internal pressure of the discharge side branch passage 31 further increases and reaches the specified value due to completion of crimping, etc., the relief valve 36 opens as shown in Fig. 5, and the pressure of the branch passage 32 is released to the passage 42, and the above-mentioned trochoid pump 39
The oil is then returned to the oil tank T.

As described above, according to the present invention, a motor driven at low oil pressure is used as the drive base, and the pressure is increased from the low oil pressure to high oil pressure to extract only the high pressure, thereby eliminating the low oil pressure that the work vehicle originally has. It allows tools to be driven using hydraulic pressure, and its features are great.

[Brief explanation of the drawing]

Figure 1 is a front view of the proposed drive unit with the tool connected, Figure 2 is a longitudinal sectional view of the drive unit,
FIG. 3 is an end view of a portion of the upper, and FIGS. 4 and 5 are longitudinal sectional views of the portion of the upper in an operating state.

Claims (1)

[Scope of utility model registration request] Hydraulic motor 20 connected to and driven by a low oil pressure source
A rotating shaft 24 is extended into the base body 23 fixed to the hydraulic motor 20, and a swash plate cam 25 is provided at the end of the rotating shaft 24, and the swash plate cam 25 is provided with a plurality of plungers constituting a high pressure generating pump. 26,
A cylinder 28, into which one end of 27 is brought into sliding contact with each other, and into which the plungers 26 and 27 are inserted and supported;
29 is a branch path 3 of an oil feed path 30 that connects to the motor 20.
1 and 32, a discharge valve 33 is provided between one branch path and the corresponding cylinder 28, and a suction valve 33 is provided between the other branch path 32 and the corresponding cylinder 29. ′ respectively,
The branch path 31 where the discharge valve 33 is located is communicated with the input port 34 for connection to the tool, and the branch path 31, 3
A valve 3 that cuts off communication between the branch passage 31 and the other branch passage 32 due to an increase in the internal pressure of the branch passage 31 between the two branches.
5, and this valve 35 and the port 3
4 is communicated with the relief valve 36, and this shaft 24 is connected around the rotating shaft 24.
A trochoid pump 39 is provided, which consists of a runner 37 fixed to the runner 37 and a stator 38 surrounding the runner 37, and the suction side 40 of this pump 39 is connected to one end with another return port 4 for connecting a tool.
1, and the discharge side 43 of the pump 39 is connected to the oil return path 44 of the motor 20. pump.