JPH0735787U - Variable displacement hydraulic pump - Google Patents

Abstract

(57) [Summary] [Purpose] The product cost can be reduced by allowing the discharge port to be oriented in either the left or right direction. [Structure] The input shaft 14 passes through a main shaft center A which is concentric with the input shaft 14 of the hydraulic pump 10 and which is perpendicular to the plane of the drawing.
The flange surface 11a of the discharge port and the mounting surface 11b for mounting the control valve C are provided on a surface parallel to the main plane B on the right side of the figure, and the displacement sensor for detecting the discharge capacity is provided on the same side of the main plane B as those surfaces. S is provided, and an oil inlet 13A is provided on the upper surface side that is on the same side as those surfaces with respect to the main plane B and is orthogonal to them, and an oil inlet is also provided on the lower surface side corresponding thereto, and the hydraulic pump 10 is turned upside down. However, it should be possible to maintain good mounting workability and operability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a variable displacement hydraulic pump used for power transmission of various industrial machines, and more particularly to a variable displacement hydraulic pump that changes the discharge capacity by introducing pressure liquid from its own discharge line via a control valve. .

[0002]

[Prior art]

 Conventionally, in this type of variable displacement hydraulic pump, as shown in the plan view of FIG. 5, the flange surface 21a of the discharge port 22 and the control valve C1 are provided on the surfaces of the pump casing 21 of the hydraulic pump 20 which are orthogonal to each other. With the mounting surface 21b for mounting, or as shown in the front view of FIG. 6, discharge to the same side (left side in the figure) of the pump casing 31 with respect to the center A of the hydraulic pump 30 (input shaft). For example, the flange surface 31a of the port 32 and the mount surface 31b for mounting the control valve C2 are arranged in parallel.

In the hydraulic system using these hydraulic pumps, due to the design of the mother machine, the discharge port of the hydraulic pump may be located on the left side or the right side with respect to the main shaft center A when viewed from the input shaft side. In either case, when the hydraulic pump is mounted on the mother machine, the piping work is facilitated by disposing the reservoir tank on the side opposite to the discharge port with respect to the main shaft center.

[0004]

[Problems to be solved by the device]

 However, in such a conventional variable displacement hydraulic pump, the rotation direction of the input shaft differs depending on whether the discharge port is on the left side or on the right side with respect to the center of the main shaft with the former configuration. However, the number of parts needed to be increased, and a large number of parts had to be designed corresponding to the direction of rotation, resulting in a large increase in the types of parts.

If the same hydraulic pump is installed upside down instead of providing the left and right ones separately, it is possible to direct the discharge port in the desired direction, but the control valve Since the mounting mount and the discharge port flange surface are orthogonal, the operability is good when the control valve is on the upper side, but when the control valve is on the lower side, it becomes extremely difficult to operate the control valve. Or, there was a problem that the control valve interfered with the installation and could not be attached to the mother machine.

Further, in the latter, since the control valve mounting mount surface and the discharge port flange surface are on the same side with respect to the center of the spindle, the discharge port is opposite to the reservoir tank by reversing left and right around the axis X. Even if the valve is oriented in the same direction, the control valve will not be on the same side as the discharge port and will not cause any inconvenience in operability, but it will be necessary to lubricate the pump casing with hydraulic oil before starting the hydraulic pump. If a capacity sensor that detects the mouth or discharge capacity (neither is shown) is on the opposite side of the main shaft from the flange surface of the discharge port, the above-mentioned lubrication port or capacity sensor will come to the reservoir tank There was a problem that work and wiring work became difficult. Note that this point is the same in the hydraulic pump shown in FIG.

The present invention has been made in view of the above points, and it is an object of the present invention to reduce the product cost by allowing the direction of the discharge port to be oriented in either the left or right direction.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a variable displacement hydraulic pump that changes the discharge capacity by introducing hydraulic pressure from its own discharge line through a control valve. The mounting surface for mounting the control valve and the mounting surface for mounting the control valve through the center of the main axis of the hydraulic pump and on the same side parallel to the main plane perpendicular to the main plane vertical with the pump installed. Provided is a variable displacement hydraulic pump having an oil inlet on a surface that is orthogonal to the main plane on the same side as the flange surface and the mount surface.

Further, in the variable displacement hydraulic pump described above, it is preferable that a displacement sensor for detecting the discharge volume to be controlled or its equivalent amount is provided on the same side as the discharge port with respect to the main plane. Here, the term "substantial amount" refers to an amount that represents the discharge capacity, such as the swash plate angle of a swash plate type piston pump.

[0010]

[Action]

 By configuring the variable displacement hydraulic pump according to the present invention as described above, it is possible to reverse the direction of the discharge port with respect to the main plane by reversing the top and bottom. Then, when this hydraulic pump is mounted on the mother device, if the discharge port is arranged on the opposite side of the reservoir tank with respect to the main plane according to the normal installation method, the control valve will also operate on the opposite side of the reservoir tank. There is no risk of loss of sex. At the same time, with respect to the main plane, the lubrication port provided on the same side as the flange surface and the mounting surface and orthogonal to the main plane is located on the upper side of the side separated from the reservoir tank, and the operation to the pump casing before starting the pump is performed. Lubrication of oil is also easy.

Further, in the variable displacement hydraulic pump described above, if the displacement sensor for detecting the discharge amount is provided on the same side as the discharge port with respect to the main plane, the displacement sensor and the control unit are connected. The connection action of the signal output line is also extremely easy.

[0012]

【Example】

 An embodiment of the present invention will be specifically described below with reference to the drawings. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a bottom view thereof.

The variable displacement hydraulic pump 10 changes the discharge capacity by introducing a pressure liquid from a self-discharge line via a control valve, and is a flange of the discharge port 12 of the pump casing 11. The surface 11a and the mounting surface 11b for mounting the control valve C are parallel to the main plane B which is perpendicular to the main axis B in the installed state through the main axis center A, and each plane is parallel to each other on the same side with respect to the main plane B. It is provided.

Further, with respect to the main plane B, on the same side as the flange surface 11a and the mount surface 11b, a capacity sensor S for detecting the discharge capacity or its equivalent amount is provided, and on the same side as the flange surface 11a. Also, oiling ports 13A and 13B with lids are provided on the upper and lower surfaces orthogonal to the mounting surface 11b, and the signal take-out line S1 from the capacity sensor S is connected to a discharge capacity control device (not shown), and its output signal The discharge capacity is controlled via the control valve C by.

FIG. 4 is a perspective view showing an example of a state in which the hydraulic pump 10 having the above-described configuration is mounted on the mother machine device (hydraulic device) 1, which is coaxial with the center A of the main shaft of the hydraulic pump 10. The input shaft 14 (FIGS. 1 to 3) is connected to the rotary shaft of the electric motor 2 arranged on the base 1a of the mother machine 1 through a coupling (not shown), and its suction port is also shown on the base 1a. At the right side of the reservoir tank 3 is connected to the fuel filler port 3a by the connecting joint 4.

Then, on the flange surface 11a of the discharge port 12 provided in the pump casing 11, the mounting seat 5a of the pipe 5 such as a rubber hose wound with cloth or a wire blade is fixed to the outer peripheral portion of the rubber tube in a sealed state. The control valve C for flow control is fixed on the mounting surface 11b for mounting the control valve, which is formed on the upper surface of the flange surface 11a, and these flange surface 11a, mounting surface 11b and The capacity sensor S is on the surface opposite to the reservoir tank 3, and the lubrication port 13A is also sufficiently separated from the reservoir tank 3.

Further, in the case where the arrangement of the reservoir tank 3 is on the left side of the hydraulic pump 10 in FIG. 4 due to the design of the mother device 1, the hydraulic pump 10 is simply turned upside down and the reservoir tank 3 is turned upside down. 3 on the right side, and the suction port may be connected to the fuel filler side provided on the opposite surface of the reservoir tank 3.

In this case, the control valve C is on the lower side of the discharge port 12, but these are all on the opposite side of the reservoir tank 3 including the capacity sensor, and the oil supply port 13B (FIG. 3) is also located on the reservoir tank 3 side. Since they are located apart from each other, there is no inconvenience in installing the hydraulic pump 10, and the lubrication work and the adjustment work are easy.

Further, the positions of the flange surface 11a of the discharge port 10, the mounting surface 11b for mounting the control valve C, the capacity sensor S, and the oil inlets 13A and 13B are provided on one side with respect to the main plane B. Since it can be used without disturbing the installation property, oiling property, and adjustability when the direction of 12 is oriented to the left or right with respect to the main plane B, two types of parts in which the rotation direction of the input shaft 14 is different Since it is not necessary to prepare the, it is possible to suppress the cost increase due to this.

In the above embodiment, the lubricating ports 13A and 13B with lids are provided at the upper and lower two positions of the pump casing 11, but the pump casing material made of casting is shared and the lubricating ports are provided only on the upper side. It is also possible to process and open.

In this way, the position of the lubricating port on the upper side differs depending on the direction of the discharge port 12, so that the processed pump casing 11 cannot be shared, but the number of drilling steps for the lubricating port is different from that of the embodiment. As described above, the cost is reduced by half compared to the case of two locations, and since the lid for the lower oil filling port is not required, these costs can be reduced and almost the same effect can be obtained in terms of production cost. it can.

[0022]

[Effect of device]

 As described above, in the variable displacement hydraulic pump according to the present invention, the flange surface of the discharge port and the mounting surface for mounting the control valve are arranged on the same side with respect to the main plane and are parallel to the main plane. Since the lubrication port was provided on the same side on a plane orthogonal to the main plane, the workability of piping and lubrication can be improved even if the hydraulic pump is arranged with the discharge port facing left or right with respect to the main plane. The operability of the control valve can be effectively maintained.

Therefore, it is not necessary to change the rotation direction of the input shaft of the hydraulic pump according to the direction of the discharge port to prepare a large number of two parts each, and in any case, one type of component constitutes the hydraulic pump. Therefore, the product cost can be reduced.

In addition to the above configuration, if a capacity sensor for detecting the discharge capacity or its equivalent amount is provided on the same side as the discharge port with respect to the main plane, a wiring for extracting the signal from the capacity sensor to the outside. Work becomes easy.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a bottom view of the same.

FIG. 4 is a perspective view showing an example of a state in which the variable displacement hydraulic pump is installed in a mother device.

FIG. 5 is a plan view showing an example of a conventional variable displacement hydraulic pump.

FIG. 6 is a front view showing another example of a conventional variable displacement hydraulic pump.

[Explanation of symbols]

 1: Mother machine device 2: Electric motor 3: Reservoir tank 4: Connection joint 10: Hydraulic pump 11: Pump casing 11a: Discharge port flange surface 11b: Control valve mounting mount surface 12: Discharge port 13A, 13B: Oil injection port 14: Input shaft (spindle) A: Spindle center B: Main plane C: Control valve S: Capacity sensor

Claims (2)

[Scope of utility model registration request] 1. A variable displacement hydraulic pump that changes the discharge capacity by introducing hydraulic pressure from its own discharge line via a control valve, wherein the discharge port flange surface and the control valve are mounted. And the mounting surface of the hydraulic pump are arranged parallel to the main plane on the same side with respect to a main plane perpendicular to the main axis of the pump in a state where the pump is installed, and the flange surface and the mounting surface with respect to the main plane. A variable displacement hydraulic pump characterized in that an oil injection port is provided on the same side as the above and on a surface orthogonal to the main plane. 2. The variable displacement hydraulic pump according to claim 1, wherein a displacement sensor for detecting a discharge volume to be controlled or its equivalent amount is provided on the same side as the discharge port with respect to the main plane. Variable displacement hydraulic pump.