JPH09209939A - Electric motor-driven hydraulic steering machine hydraulic pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable pump installation and oil passage connection to be executed simultaneously, piping work execution after installation of the pump to be omitted so as to attempt reduction of manufacturing date schedule and the cost, concerning a hydraulic pump installation structure applicable to an electric motor-driven hydraulic steering machine and other various sorts of hydraulic pumps. SOLUTION: The outer crust of a hydraulic pump P is formed of a casing 1, a front plate 2, and an end plate 3 and encloses a shaft 6 inside thereof. The bottom installation surface e of the end plate 3 is formed in a plane on which oil outlet/inlet is bored. The end plate 3 is placed on the valve block 17 and the oil outlet/inlet of the end plate 3 and that of the valve block 17 are connected to each other. The connection port of the valve block 17 and a hydraulic cylinder are connected to each other by means of pipings 26, 27 so as to operate a hydraulic cylinder 23 to control a steering machine. When the shaft 6 is rotated in the direction of an arrow mark n and a solid cam 12 is inclined in the direction shown in the figure (+) side, oil is fed out to move the hydraulic cylinder 23 in Q direction shown in the figure. And if the solid cam 12 inclined in the direction shown in the figure (-), the hydraulic cylinder is moved in the direction opposite to the direction of an arrow mark Q.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pump installation structure that is widely applied to hydraulic pumps such as various hydraulic presses, injection molding machines, and ship machines, as well as electric hydraulic steering gears.

[0002]

2. Description of the Related Art An example of a conventional installation structure for a hydraulic pump of this type is shown in FIGS.

In these figures, a hydraulic pump P'is installed on a base plate, and a pipe H is provided between an oil inlet / outlet of the pump P'and a valve block 17 'containing a switching valve and a safety valve by using a pipe flange. Connected.

Reference numeral 6'denotes a shaft rotatably supported in the casing of the hydraulic pump P ', 10' an auxiliary pump connected to the shaft 6'by a coupling,
1'is a piston, 12 'is a solid cam, 15' is a controller connected to the solid cam 12 'by a link 16', 2
3'denotes a hydraulic cylinder.

Reference numerals c'and d'represent eyebrow-shaped ports communicating with the oil passages of the end plates of the casing forming the outer shell of the hydraulic pump P '.

[0006]

When installing the conventional hydraulic pump as described above, after the hydraulic pump P'is installed on the base plate, the hydraulic pump and the valve block 17 incorporating the switching valve and the safety valve are installed. ′ Is connected by pipe H using a pipe flange, but there is variation due to machining and assembly in the position degree, squareness, and parallelism accuracy between the installation surface of the hydraulic pump and the piping connection surface At the time of work, the method of matching the actual products for each one is adopted.

[0007] As described above, since the piping work cannot be performed until after the hydraulic pump has been installed, there are problems such as an obstacle in shortening the manufacturing schedule and an increase in cost.

In addition, the method of manufacturing the piping in advance and mounting it on the hydraulic pump may cause oil leakage due to insufficient adhesion of the pipe flange connection port due to the above-mentioned variation in processing and assembly accuracy. Become.

Further, if it is forcibly mounted with an error, residual stress that causes damage to the hydraulic pump and piping is dangerous.

The present invention solves the above-mentioned disadvantages of the prior art, and after installing the hydraulic pump, eliminates the piping work by matching the actual product, and provides a new hydraulic pump that shortens the manufacturing schedule and reduces the cost. Has an aim.

[0011]

As a structure for achieving the above-mentioned object, an electric hydraulic steering gear hydraulic pump of the present invention has an oil inlet / outlet provided on an installation surface of a hydraulic pump machined on a flat surface, The contact surface of the valve block, which constitutes the passage connection port and is connected to the hydraulic cylinder on the one hand, and which incorporates the switching valve and the safety valve, with the installation surface of the hydraulic pump is machined into a flat surface, and the contact surface is provided with the oil of the hydraulic pump. An oil passage connection port that coincides with the inlet / outlet port is provided, the hydraulic pump is mounted on the valve block, and both are fastened with a fixing bolt or the like, so that installation of the hydraulic pump and connection of the oil passage can be performed at the same time. It is characterized by being configured as follows.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a structural explanatory view showing an example of an embodiment of the present invention, FIG. 2 is a sectional view taken along line VV of FIG. 1, FIG. 3 is a sectional view taken along line WW of FIG. 1, and FIG. 4 is a hydraulic pressure in the same example. It is a circuit diagram.

In these figures, 1 is a casing, 2
Is a front plate of the same casing, 3 is an end plate of the same casing, casing 1 and front plate 2 are bolts 4, and casing 1 and end plate 3
Are fastened together by bolts 5 to form the outer shell of the hydraulic pump P.

Reference numeral 6 denotes a shaft rotatably supported in the casing of the hydraulic pump. The shaft 6 is supported by bearings 7 and 8, and the cylinder barrel 9 is connected to the shaft 6 by a spline a provided coaxially in the axial direction. ing.

An auxiliary pump 10 is attached to the end plate 3 of the casing 1, and the auxiliary pump 10
Is connected to the proximal end of the shaft 6 by a coupling 28.

The cylinder barrel 9 has nine piston holes b.
And a piston 11 is inserted into each hole.

Further, a slipper 13 that slides in a plane with the solid cam 12 is attached to the tip of each piston 11.

The valve plate 14 has eyebrow-shaped ports c and d communicating with the oil passage of the end plate 3 of the casing. The valve plate 14 is fixed to the end plate 3 and slides on the cylinder barrel 9.

The solid cam 12 is linked to the controller 15
6, the tilt of the solid cam 12 can be changed by the controller 15.

The lower installation surface e of the end plate 3 of the casing 1 is formed into a flat surface by machining, and the installation surface e is provided with oil inlets / outlets f and g as shown in FIG.
The eyelid-shaped ports c and d provided in the valve plate 14 are connected to each other by passages h and i.

The end plate 3 of the hydraulic pump has its lower surface placed on the valve block 17 and is fixed by bolts 18, and the oil inlets and outlets f and g of the end plate 3 are
The oil inlets and outlets j and k of the valve block 17 are connected as shown in FIG. 3, and the oil pressure is sealed by an O-ring 19 arranged on the outer periphery of the flow passage opening.

As shown in FIG. 4, the valve block 17 incorporates a switching valve 20, a safety valve 21, and a stop valve 22 and has connection ports 1 and m for a hydraulic cylinder 23. The block 17 is mounted on a base plate 24. It is fixed with bolts 25.

The connection ports 1, m of the valve block 17
And the hydraulic cylinder 23 are connected by pipes 26 and 27. The hydraulic cylinder 23 operates the steering gear by its operation.

Next, the operation of the hydraulic pump of the present invention having the above structure will be described. First, the shaft 6 is rotated in the direction indicated by the arrow in FIG. 1 (n direction), and the inclination of the solid cam 12 is inclined toward the (+) side as shown in FIG. Sent out, valve block 1
7 is guided to the hydraulic cylinder 23 through the switching valve 20 and moves the hydraulic cylinder 23 in the direction of the arrow shown in FIGS.

When the solid cam 12 is tilted in the arrow (-) direction shown in FIG. 1, the hydraulic cylinder 23 is moved in the direction opposite to the arrow Q.

When the inclination of the solid cam 12 is set to 0 (neutral state), the discharge amount of the hydraulic pump P becomes 0 and the movement of the hydraulic cylinder 23 stops.

Although an example of the embodiment of the present invention has been briefly described above, the installation operation of the hydraulic pump according to the present invention will be summarized as follows.

That is, the installation surface e of the hydraulic pump P is machined into a flat surface, and oil inlets / outlets f and g having O-ring grooves for sealing hydraulic pressure are provided.

On the other hand, in the valve block 17 having the built-in switching valve and safety valve, the hydraulic pump installation surface e is machined into a flat surface so that the connection ports j and k coincide with the oil inlet and outlet of the hydraulic pump.
Is fixed to the base plate 24.

By mounting the hydraulic pump P on the valve block 17 and tightening the fixing bolts, the hydraulic pump can be installed and the oil passage can be connected at the same time.

[0031]

The oil inlet and outlet of the hydraulic pump are provided on the installation surface of the hydraulic pump on the valve block side, and the connection port corresponding to the oil inlet and outlet of the hydraulic pump is also provided on the installation surface of the hydraulic pump. It becomes possible to connect at the same time, and piping work after installing the hydraulic pump becomes unnecessary, which has the effect of shortening the manufacturing schedule and reducing costs.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a hydraulic pump according to an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line VV of FIG.

FIG. 3 is a sectional view taken along line WW of FIG.

FIG. 4 is a hydraulic circuit diagram of the hydraulic pump of FIG.

FIG. 5 is a structural explanatory view showing an example of a conventional hydraulic pump.

6 is a cross-sectional view taken along line XX of FIG.

7 is a cross-sectional view taken along the line YY of FIG.

[Explanation of symbols]

 1 Casing 2 Front Plate 3 End Plate 6 Shaft 7,8 Bearing 9 Cylinder Barrel 10 Auxiliary Pump 11 Piston 12 Solid Cam 13 Slipper 14 Valve Plate 15 Controller 16 Link 17 Valve Block 20 Switching Valve 21 Safety Valve 22 Stop Valve 23 Hydraulic Cylinder 24 Base plate 26, 27 Piping P Hydraulic pump e Installation surface f, g, j, k Oil inlet / outlet h, i Passage

Claims (1)

[Claims] 1. A valve block having a hydraulic pump machined into a flat surface, which is provided with an oil inlet / outlet port to form an oil passage connection port, and which is connected to a hydraulic cylinder and has a switching valve and a safety valve built therein. The contact surface with the hydraulic pump installation surface is machined into a flat surface, and the contact surface is provided with an oil passage connection port that matches the oil inlet and outlet of the hydraulic pump, and the hydraulic pump is mounted and fixed on the valve block. A structure of an electric hydraulic steering gear hydraulic pump characterized in that the hydraulic pump can be installed and the oil passage can be connected at the same time by fastening the two with bolts and the like.