JPS6350682A - Hydraulic pump - Google Patents

Abstract

PURPOSE:To aim at making a hydraulic pump compact, by forming a discharge port in the peripheral wall of a pressure generating chamber in each cylinder, so that the discharge port crosses the axial direction of the cylinder, and by providing a valve in the opening part of the discharge port. CONSTITUTION:A piston 24 is slidably fitted in each cylinder 23 in a pump section 12, a pressure chamber 26 being defined between the bottom of the cylinder 23 and the piston 24. A valve seat 34 is formed in an annular groove 32 in the cylinder 23 at the opening part of a discharge port 34, and a discharge valve 39 in the form of a ball valve is provided. Accordingly, the overall length of the pump body in the axial direction of the cylinder may be greatly reduced, and it is possible to aim at making the hydraulic pump compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic pump that is small and generates high pressure and is mounted on, for example, an automobile.

"Prior Art" Conventionally, a hydraulic pump has been installed in an automobile as a component of an automobile anti-skid device. In this conventional hydraulic pump, as shown in Japanese Patent Application Laid-Open No. 58-202142, the discharge hole 2 communicating with the pressure generating chamber 1 shown in FIG. A ball valve 5 for opening and closing the discharge port 2 is disposed in series with a ball valve 7 supporting spring 8 for opening and closing the suction port 6 provided on the piston 4. After the cylinder 3 is assembled into the main body 9, a retaining member 10 is screwed into the pump main body 9.

However, in such a conventional hydraulic pump, there is a suction valve (ball valve) 7 on the center line of the cylinder 3. spring 8
．． Since the discharge valves (ball valves) 5 are arranged in series,
There is a disadvantage that the length of the cylinder 3 in the axial direction becomes long, and since the removal stop part 110 is further screwed in after the cylinder 3 is assembled into the pump body 9, the length of the cylinder 3 in the axial direction becomes longer ( There was a problem.

Therefore, as described in Japanese Patent Application No. 61-144159, a discharge port is provided in the peripheral wall of the pressure generating chamber of the cylinder housing the piston, intersecting with the axial direction of the cylinder.
an opening of the discharge port opening on the outer periphery of the cylinder;
A valve body having a spherical or conical surface is provided in close contact with the opening to open and close the discharge port, and a temporary spring is provided to press the valve body against the opening of the discharge port, whereby the pump body in the axial direction of the cylinder is provided. The idea was to significantly shorten the overall length of the hydraulic pump, making the entire hydraulic pump smaller and lighter, and requiring less space to install it in a vehicle.

``Problems to be Solved by the Invention'' However, in this overnight pressure pump, the valve body that is provided at the opening of the discharge port and opens and closes the discharge port is attached to the opening of the discharge port by the biasing force of a leaf spring. Since the leaf spring is pressed by the valve, the leaf spring will cover the discharge port, and when the amount of discharged liquid increases, the leaf spring will be lifted by the jet of liquid from the discharge port, weakening the force that returns the valve body to the valve seat. , there is a risk that the valve closing operation will be delayed, and if the temporary spring operates at high speed in the liquid, the operating resistance of the leaf spring due to the liquid will be large, and the speed at which the leaf spring returns to the valve seat side will be slow. There is a risk that the valve closing operation may be delayed, and when the valve body is activated, the valve body is restrained by a temporary spring and moves in an arc shape.Second, the return position of the valve body is likely to deviate from the center of the valve seat, and the valve body Since the valve does not pass the shortest distance to the valve seat, there is a risk that the valve closing operation during high-speed operation may be delayed.

An object of the present invention is to provide a hydraulic pump that solves the above problems.

"Means for Solving the Problems" The present invention has the following configuration in order to achieve the above object. That is, in a hydraulic pump that generates hydraulic pressure by reciprocating a piston that is brought into contact with the outer periphery of the eccentric cam by the operation of the eccentric cam, the piston that is brought into contact with the outer periphery of the eccentric cam is reciprocated to generate hydraulic pressure. A discharge port is provided intersecting the axial direction, and an elastic valve body is provided at the opening of the discharge port that opens on the outer periphery of the cylinder and has a spherical surface that tightly contacts the opening to open and close the discharge port. Forming the vA material into a ring shape so that both ends of the wire overlap, and forming a ring part by the ah on the opposite side of the overlapping both end sides of the wire and facing the both end sides, The inner diameter of the ring portion is set to a diameter that prevents the passage of the valve body within the ring portion, and both end sides of the wire rod are engaged with engaging portions provided on the outer peripheral surface of the cylinder, and the ring portion is A ring spring made of the wire rod is provided for fitting the valve body into the portion and pressing the valve body against the opening of the discharge port.

``Function'' A discharge port is provided on the circumferential wall of the pressure generating chamber of the cylinder, intersecting with the axial direction of the cylinder, and a valve is provided at the opening of this discharge port, so the length in the axial direction is shortened, and the entire hydraulic pump The valve element is pressed against the opening of the discharge port by a spring made of a wire rod, thereby reducing the area of contact between the spring and the liquid, thereby minimizing the influence of liquid flow and the operating resistance of the spring due to the liquid. The valve body is operated linearly over the center of the discharge port, thereby preventing a delay in closing the valve.

"Embodiment" An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The hydraulic pump of the present invention comprises a motor It and a pump section 12, which are generally well known.

To explain the pump section 12, a suction chamber 14 is provided in the center of the pump body 13, and this suction chamber 14 is communicated with a reservoir 15 shown in FIG. 1 via a passage 16 and piping. A liquid is stored in the reservoir 15. Both sides of the suction chamber 14 in FIG. 1 are connected to the suction chamber 1.l and have a motor! A through hole 18.18 is formed perpendicularly to the rotating shaft 17 of (2). The rotating shaft 17 passes through the partition wall 13a of the motor 11 on the side of the pump body 13 and faces the suction chamber 14.

An eccentric cam 19 is fixedly attached to the tip of the rotating shaft 17. A ring 21 is fitted to the eccentric cam 19 via a bearing 20.

22 is an oil seal.

Further, cylinder blocks 23A, 23, 1 (IiX are fitted in the through holes 18.18, respectively, and cylinders 23.23, which are constituent members of the cylinder blocks 23A, 23A,
is screwed onto the pump body 13. A piston 24 is slidably fitted into each cylinder 23 . This piston 24 is pressed against the ring 21 by a spring 25 provided between the bottom of the cylinder 23 and the piston 24, and a pressure generating chamber 26 is formed between the bottom of the cylinder 23 and the piston 24. ing. Further, a passage 27 is formed in the piston 24 passing through the center thereof. An opening 28 is formed at one end of the passage 27 and perpendicular to the passage 27, and a valve seat 29 is formed at the other end of the passage 27. A suction valve 30 consisting of a ball valve is installed in the valve seat 29 between the valve seat 29 and the bottom of the cylinder 23:
It is urged toward the valve seat 29 side by a smooth spring 31 and is seated.

On the other hand, an annular groove 32 is formed at a predetermined location on the outer periphery of the cylinder 23, and a discharge chamber 33 is formed between the annular groove 32 and the pump body 13. The cylinder 23 also has a discharge port 3 that communicates the pressure generation chamber 26 and the discharge chamber 33.
4 is formed. One discharge port 34 is formed at a radial position of the cylinder 23.

The discharge chamber 33 includes a passage 36 formed in the pump body 13, piping, an actuator (for example, an anti-skid device of an automobile) 37. It is connected to the reservoir 15 via a relief valve 38.

A valve seat 34a is formed in the annular groove 32 of the cylinder 23, located at the opening of the discharge port 34. This valve seat 3
4a is a spherical seat having a spherical recess. A discharge valve 39 made of a ball valve is seated on the valve seat 34a, and the discharge valve 39 is pressed toward the valve seat 34a by a ring spring 35 made of an elastic wire fitted in the annular groove 32. 34 can be opened and closed by a discharge valve 39.

As shown in FIGS. 3 to 5, the ring spring 35 is formed of an elastic wire rod into an elliptical ring shape such that both end side parts 35b and 35b of the wire rod overlap, and the overlapping end side parts 35b of the wire rod overlap. , 35b, a ring portion 35a formed by curving this wire is formed at a portion facing these both end side portions 35b, 35b, and this ring portion 3
The inner diameter of 5a is the discharge valve 39 in this ring portion 5a.
(in this embodiment, the diameter is smaller than the maximum diameter of the discharge valve 39) to prevent the passage of the wire rod from both end side portions 3 of the wire rod.
5b is an engaging portion (
The discharge valve 39 is engaged with the groove 24a and is fitted in the groove 5a. For this reason,
The discharge valve 39 is pressed against the valve seat 34a at the opening of the discharge port 34 by the ring spring 35 in a deformed state.

Note that the tip portions 35c, 3 of the both end side portions 35b, 35b
5c is bent outward. This tip 35c,
35c serves as a handle for greatly deforming the inner diameter of the ring spring 35 when the ring spring 35 is assembled to the outer periphery of the cylinder 23. Further, when the discharge valve 39 is opened, the ring spring 35 is attached to the both end side portions 35b.
The engaging portion 2 is located within the engaging portion (groove) 24a to prevent the both end side portions 35b, 35b from slipping due to deformation.
It is designed to wrap around the bottom of the groove 4a.

Further, on the outer periphery of the cylinder 23, seal rings 10° 40 are located on both sides of the discharge chamber 33 in FIG.
These seal rings 40°40 turn the discharge chamber 33 into a suction chamber! = 1 and is self-disconnected from the outside. Incidentally, at the outer end of the cylinder 23, a mounting hole 41 is formed for a rotary tool for screwing the cylinder 23 onto the pump body 13 during assembly. 42: Go camping for dust and waterproof protection.

Next, the operation of the hydraulic pump configured as described in section 17 will be explained.

When the motor 11 is stopped and the rotating shaft 17 rotates,
One eccentric cam rotates together with the rotating shaft 17, and the bearing 2
The piston 24 is pushed by the ring 21 through the piston 21 and reciprocates in its axial direction, thereby changing the volume of the pressure generating chamber 26.

When the screw l-724 moves in the direction of compressing the spring 25, the hydraulic pressure in the pressure generating chamber 26 increases, and when the hydraulic pressure becomes higher than the hydraulic pressure in the discharge chamber 33, the pressure generating chamber 26. Discharge port 3
The liquid in 4 resists the force of the ring spring 35 and closes the discharge valve 39 in 7.
The cylinder 23 is pressed radially outward to open the discharge valve f'39, and the flow flows into the discharge chamber 33 and into the passage 36. It flows into the reservoir 15 via piping and the actuator 37. At this time, the suction valve 30 is in a state in which the passage 27 is closed by the force of the spring 31.

Further, since the ring spring 35 that presses the discharge valve 39 against the opening of the discharge port 34 is made of wire, its contact area with the liquid is small, and the influence of the jet flow ejected from the discharge port 34 on the ring spring 35 is extremely small. In addition, when operating at high speed in liquid, the operating resistance to the liquid is kept small and the delay in operation of the discharge valve 39 is prevented.
- to do. Further, a ring portion 35+L is formed at a position facing both end side portions 35b of the ring spring 35, and the discharge valve 39 is fitted into this ring portion 35a, so that the discharge valve 39 is straight at the center of the discharge port 34. Operate.

Therefore, since the discharge valve 39 moves the shortest distance, a delay in opening and closing of the discharge valve 39 is prevented.

Note that if the liquid pressure in the pressure generation chamber 26 is excessive, the pressure generation '? , r) 6. The liquid in the discharge port 34 flows into the reservoir 15 through the relief valve 38.

After the piston 24 compresses the spring 25 to the maximum,
The spring 25 presses the piston 24 toward the eccentric cam 19 while it is in contact with the ring 21, thereby increasing the volume of the pressure generating chamber 26. Then, the discharge valve 39 closes, and as the volume of the pressure generation chamber 2G increases, the pressure inside the pressure generation chamber 26 decreases and finally becomes below atmospheric pressure, and the difference between the pressure inside the passage 27 and the pressure inside the pressure generation chamber 26 decreases. The pressure causes the suction valve 30 to disengage from the valve seat 29 and open the passage 27. As a result, the suction V (atmospheric pressure) 14 passes through the passage 27 to the pressure generation chamber 2.
6. Suck in the liquid. At this time, the discharge valve 39 remains closed. Note that after the discharge of liquid from the discharge port 34 is finished, the discharge valve 39 needs to be restored quickly to close the discharge port 34, but the discharge valve 39 is quickly returned to the opening of the discharge port 34 by the force of the ring spring 35. The discharge port 34 is reliably closed in close contact.

Further, the ring spring 35 has both ends (1111 parts 35b, 3
5b is engaged with the engaging portion 24 of the cylinder 23 so as not to slip, so that rotation is always prevented.

As described above, the suction valve 30 and the discharge valve 39 alternately function as one-way valves to activate the pump function. That is, one piston 2.1 in the pump body 13 is connected to one of the pistons 2.
The liquid is sucked in and discharged once each rotation. In FIG. 1, in the left and right pistons 2.4, the liquid suction and discharge operations are performed in reverse.

Further, in this embodiment, since the discharge port 34 is provided in the peripheral wall of the pressure generating chamber 26 of the cylinder 23 perpendicularly to the axial direction of the cylinder 23, the total length of the pump body 13 in the axial direction of the cylinder 23 is significantly shortened. As a result, the hydraulic pump as a whole becomes smaller and lighter, requiring less space for installation in a vehicle, and since the number of parts is reduced, it is easier to assemble them.

"Effects of the Invention" According to the present invention, in a hydraulic pump that generates hydraulic pressure by reciprocating a piston brought into contact with the outer periphery of the eccentric cam by the operation of the eccentric cam, the cylinder housing the piston oCN is used. A discharge port is provided in the peripheral wall of the pressure generating chamber intersecting the axial direction of the Norinda described in 01j, and the discharge port is opened and closed in close contact with the opening of the discharge port that opens on the outer periphery of the cylinder. A valve body having a spherical surface is provided, and a wire rod is formed into a ring shape so that both ends of the wire (O) overlap, and both ends of the wire (O) are formed on the opposite side of the bent part. A ring portion is formed of the wire at a portion facing the side portion, the inner diameter of the ring portion is a diameter that prevents passage of the valve body within the ring portion, and both end side portions of the wire are formed on the outer peripheral surface of the cylinder. Since a ring spring made of the wire rod is provided to engage an engaging portion provided in the cylinder and to fit the valve body into the ring portion and press the valve body against the opening of the discharge port, the axial direction of the cylinder The overall length of the pump body has been significantly shortened, making the entire hydraulic pump smaller and lighter, requiring less space to install on the vehicle, and the fewer parts it has, making it easier to assemble. Of course, since the ring spring that presses the valve body against the opening of the discharge port is made of wire,
The contact area of the ring spring with the liquid is small, the influence of the liquid flow on the ring spring is extremely small, and even when the ring spring is operated at high speed in liquid, the operating resistance of the ring spring against the liquid is reduced, and as a result, the discharge valve is Delays in operation can be reliably prevented. In addition, a ring part is formed on the opposite side of both end sides of the ring spring at a position facing these both end sides, and the valve body is fit into this ring part, so that it can be placed over the center of the discharge port. The valve body operates in a straight line, so the valve body moves the shortest distance, thereby reliably preventing delays in opening and closing the valve.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a sectional view taken along line I-1 in Figure 2, Figure 2 is a partially cutaway side sectional view, Figure 3 is a sectional view taken along line 1-m in Figure 1, and Figure 4 is a sectional view taken along line 1-m in Figure 1. FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 3, FIG. 5 is a perspective view of a spring, and FIG. 6 is a vertical cross-sectional view of essential parts showing an example of a conventional hydraulic pump. 11...Motor, 12...Pump section,
13... Pump body, 14... Suction chamber, 15
・Reservoir, 17...Rotary axis, 19...
...Eccentric cam, 23...Cylinder, 24...
... Piston, 24a ... Retention part (groove), 26
... Pressure generation chamber, 27 ... Passage, 30
...Suction valve, 32. ...Annular groove, 34...Discharge port, 34a...Valve seat, 35...Ring spring, 352L...Ring part, 35b...
End side portion, 39...Discharge valve (valve body).

Claims (1)

[Claims] In a hydraulic pump that generates hydraulic pressure by reciprocating a piston that is brought into contact with the outer periphery of the eccentric cam due to the operation of the eccentric cam, the peripheral wall of the pressure generating chamber of the cylinder that accommodates the piston is attached in the axial direction of the cylinder. A discharge port is provided intersecting with the cylinder, and a valve body having a spherical surface is provided in the opening of the discharge port that opens on the outer periphery of the cylinder to open and close the discharge port in close contact with the opening, and a wire having elasticity is provided. The wire is formed into a ring shape so that both ends thereof overlap, and a ring portion is formed of the wire at a portion opposite to the overlapping end sides of the wire and facing the both end sides, and the ring portion is formed into a ring shape. has an inner diameter that prevents the valve body from passing through the ring portion, and both end sides of the wire are engaged with engaging portions provided on the outer peripheral surface of the cylinder, and the valve body is inserted into the ring portion. A hydraulic pump characterized in that a ring spring made of the wire is inserted into the valve body and presses the valve body against the opening of the discharge port.