JPWO2018185820A1 - Hydraulic device - Google Patents

Abstract

A tank for storing the hydraulic fluid therein, a pump that is a power source for supplying the hydraulic fluid from the tank to the drive target, and a hydraulic fluid to be taken in and out between the tank and the drive target. In a hydraulic device comprising a hydraulic circuit and a suction strainer in which the base end portion is fitted into the pump, both improvement in workability during assembly and maintenance and stability of mounting the suction strainer to the pump are achieved. In order to achieve this, a retaining portion for retaining the suction strainer is provided at a portion of the tank corresponding to the tip of the suction strainer.

Description

  The present invention provides a tank for storing hydraulic fluid therein, a pump that is a power source for supplying hydraulic fluid from the tank to a drive target, and a hydraulic fluid between the tank and the drive target. The present invention relates to a hydraulic apparatus including a hydraulic circuit for taking in and out and a suction strainer having a base end connected to the pump.

  Conventionally, a tank for storing hydraulic fluid therein, a pump that is a power source for supplying hydraulic fluid to the drive target from within the tank, and the hydraulic fluid being taken in and out between the tank and the drive target A hydraulic apparatus including a hydraulic circuit for performing the above and a suction strainer having a base end connected to the pump has been used (see, for example, Patent Document 1). In such a hydraulic device, the connection between the pump and the suction strainer is conventionally as follows.

  That is, in the conventional hydraulic device of this type, a male screw portion is formed at the base end portion of the suction strainer, and a female screw hole that can be screwed with the male screw portion is provided at the suction port of the pump. After the sealing material is applied, the male screw portion is screwed into the female screw hole.

  However, in such a configuration, when connecting the suction strainer to the pump, it takes time to manage the tightening torque, adjust the direction of the suction strainer, and apply the sealing material, and there is a problem that the connection work takes time. To do.

  In addition, when replacing the pump, after removing the suction strainer from the pump, remove the sealing material from the male threaded portion of the suction strainer, and then apply a new sealing material to the male threaded portion. Since it is necessary to perform the work of attaching the strainer to the pump, there is a problem that it takes time to replace the pump.

JP-A-8-159101

  The present invention pays attention to the above points, and an object of the present invention is to improve workability at the time of assembly and maintenance in a hydraulic device in which a proximal end portion of a suction strainer is connected to a pump.

  In order to solve the above problems, the hydraulic device according to the present invention has a configuration as described below. That is, the hydraulic device according to the present invention includes a tank for storing hydraulic fluid therein, a pump that is a power source for supplying hydraulic fluid from the tank to a drive target, the tank, and the drive target. A hydraulic circuit comprising a hydraulic circuit for taking in and out the hydraulic fluid between and a suction strainer in which a base end portion is fitted into the pump, and corresponds to a distal end portion of the suction strainer in the tank The part is provided with a retaining part for retaining the suction strainer.

  In such a configuration, when the suction strainer is attached to and detached from the pump, the base end of the suction strainer is fitted into the pump, and a seal member is provided between the suction strainer and the pump. The workability can be improved. In addition, the tip of the suction strainer is simply fitted into the pump by providing a retaining portion for retaining the suction strainer at a portion of the tank corresponding to the tip of the suction strainer. Even if it exists, since the removal | extraction from the pump of a suction strainer can be suppressed by the said retaining part, the improvement of workability | operativity mentioned above and the stability of the attachment to the pump of a suction strainer can be made compatible.

  ADVANTAGE OF THE INVENTION According to this invention, in the hydraulic apparatus by which the base end part of a suction strainer is connected to a pump, workability | operativity at the time of an assembly and a maintenance can be improved, aiming at the stability of a connection.

1 is a schematic diagram showing a vehicle equipped with a hydraulic device according to an embodiment of the present invention. The circuit diagram which shows the hydraulic circuit containing the hydraulic apparatus which concerns on the same embodiment. The front view which shows the hydraulic apparatus which concerns on the same embodiment. The left view which shows the hydraulic apparatus which concerns on the same embodiment. The right view which shows the hydraulic apparatus which concerns on the same embodiment. The figure which shows the attachment aspect of the suction strainer to the pump which concerns on the same embodiment.

  An embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, the hydraulic device 1 according to the present embodiment is mounted on the lower rear portion of a vehicle bed N and constitutes an actuator for raising and lowering a load receiving table (tailgate T) that is a driving object. The hydraulic fluid is supplied to the cylinder C.

  As shown in FIGS. 2 and 3, the hydraulic device 1 sucks the working fluid in the tank 3, the adapter plate 2 that forms the hydraulic circuit, the tank 3 joined to the adapter plate 2, and the like. The pump 4 is supplied toward the adapter plate 2, the suction strainer 5 in which the base end portion 5 a is fitted into the pump 4, and the return pipe 6 in which the base end portion 6 a is fitted into the adapter plate 2.

  As shown in FIG. 2, the adapter plate 2 includes a hydraulic fluid inlet 2 a that receives hydraulic fluid supplied from the pump 4, a hydraulic fluid supply port 2 b for taking in and out of the cylinder C, and the cylinder A hydraulic fluid discharge port 2c for guiding the hydraulic fluid discharged from C to the tank 3 through the return pipe 6 is provided. As shown in FIGS. 2 to 5, the adapter plate 2 incorporates a hydraulic fluid supply passage 2d, a check valve 21, a hydraulic fluid discharge passage 2e, and a relief passage 2f. A solenoid valve 22, a flow rate control valve 23, and a relief valve 24 are attached to the adapter plate 2. The hydraulic fluid supply path 2d is a passage connecting the hydraulic fluid inlet 2a and the hydraulic fluid supply port 2b. The check valve 21 is provided in the hydraulic fluid supply path 2d and suppresses the backward flow of hydraulic fluid from the cylinder C side, that is, the hydraulic fluid supply port 2b side, to the pump 4 side, that is, the hydraulic fluid inlet 2a side. The hydraulic fluid discharge path 2e branches from the hydraulic fluid supply port 2b side with respect to the check valve 21 in the hydraulic fluid supply path 2d, and communicates with the hydraulic fluid discharge port 2c. The solenoid valve 22 is provided in the hydraulic fluid discharge path 2e, and is in a first state where the flow of hydraulic fluid from the hydraulic fluid supply port 2b side to the hydraulic fluid discharge port 2c side and the hydraulic fluid supply port 2b side is blocked. One of the second states permitting the flow of hydraulic fluid from the hydraulic fluid to the hydraulic fluid discharge port 2c side is selectively taken. The flow rate control valve 23 is provided between the solenoid valve 22 and the hydraulic fluid discharge port 2c. The relief passage 2f branches from the hydraulic fluid inlet 2a side of the check valve 21 in the hydraulic fluid supply passage 2d, and the flow rate control valve 23 in the hydraulic fluid supply passage 2d and the hydraulic fluid discharge passage 2e. Rather than the hydraulic fluid discharge port 2c side. The relief valve 24 is provided in the relief passage 2f, and is opened when the hydraulic pressure in a portion of the hydraulic fluid supply passage 2d closer to the pump 4 than the check valve 21 exceeds a predetermined hydraulic pressure, In other cases, the valve is closed. Reference numeral 25 denotes a filter provided on the upstream side of the solenoid valve 22 in the hydraulic fluid discharge path 2e.

  In this embodiment, as shown in FIG. 5, the solenoid valve 22, the flow rate control valve 23 and the relief valve 24 are provided on the adapter plate 2 in the longitudinal direction of the hydraulic device, more specifically, the tank. 3 is configured to be attached and detached along the direction from 3 to the adapter plate 2.

  More specifically, a part of the solenoid valve 22 protrudes from the adapter plate 2 to the tank 3 side, the opposite side is a male screw (not shown), and is not shown provided on the adapter plate 2 side. The solenoid valve 22 is attached to the adapter plate 2 by screwing the male screw on the female screw.

  A part of the flow rate control valve 23 protrudes from the adapter plate 2 to the tank 3 side, and the opposite side is a male screw (not shown). The male screw is screwed into a female screw (not shown) provided on the adapter plate 2 side. The flow control valve 23 is attached to the adapter plate 2 by wearing.

  A part of the relief valve 24 protrudes from the adapter plate 2 toward the tank 3, and the opposite side is a male screw (not shown). The male screw is screwed to a female screw (not shown) provided on the adapter plate 2 side. By doing so, the relief valve 24 is attached to the adapter plate 2.

  As shown in FIGS. 3 and 5, the tank 3 is made of a resin attached to the side of the adapter plate 2 and stores a working fluid therein.

  As shown in FIGS. 3 and 5, the pump 4 is attached to the side of the adapter plate 2, sucks the working fluid inside the tank 3 through the suction strainer 5, and operates the working fluid of the adapter plate 2. The hydraulic fluid is discharged toward the inflow port 2a. The pump 4 is supplied with power from the motor 7. The motor 7 is mounted on the side of the adapter plate 2 and its output shaft is connected to the pump 4. The motor 7 operates when the relay switch 8 is energized.

  As described above and as shown in FIGS. 3 and 6, the suction strainer 5 is fitted with the base end portion 5 a in the pump 4, while the tip end portion 5 b is close to the bottom wall 3 a of the tank 3. Or touching. More specifically, as shown in FIG. 6, the proximal end side of the suction strainer 5 extends along the longitudinal direction of the hydraulic device 1, while the distal end side extends toward the bottom wall 3 a of the tank 3. The portion excluding the base end portion 5a and the tip end portion 5b is a pipe-like member having a substantially L shape in front view. Further, as shown in FIG. 6, the base end portion 5a of the suction strainer 5 has an outer diameter larger than that of an adjacent portion, and includes an O-ring insertion groove 5x into which an O-ring 91 as a seal member can be inserted. ing. The O-ring 91 has an inner portion disposed in the O-ring insertion groove 5x, and an outer portion that is elastically adhered to the inner wall of the hydraulic fluid suction port 4a of the pump 4. On the other hand, the tip portion 5b is provided with a plurality of protrusions 51 that are in contact with the bottom wall 3a of the tank 3 in preference to other parts. It is an opening for introduction.

  Further, a protrusion 31 as a retaining portion is formed on the bottom wall of the tank 3 outside the suction strainer 5, that is, on the opposite side of the suction strainer 5 from the adapter plate 2. The ridge 31 stands from the bottom wall 3 a of the tank 3 and extends in the longitudinal direction of the hydraulic device 1. One end of the ridge 31 hits the suction strainer 5, and the suction strainer 5 comes off. It is configured to stop.

  As described above, according to the configuration of the present embodiment, the base end portion 5 a of the suction strainer 5 is fitted into the pump 4, and the outside of the suction strainer 5 on the bottom wall 3 a of the tank 3. That is, since the protrusion 31 which is a retaining portion is formed on the opposite side of the adapter plate 2 with the suction strainer 5 interposed therebetween, the following effects can be obtained.

  That is, by fitting the base end portion 5a of the suction strainer 5 to the pump 4, the mounting operation of the suction strainer 5 to the pump 4 can be completed, so that the male screw formed at the base end portion after applying the sealing material to the base end portion Compared with the conventional configuration in which the portion needs to be screwed into the female screw hole on the pump side, the projecting ridge 31 improves the workability when the suction strainer 5 is attached to and detached from the pump 4. Since removal of the suction strainer 5 from the pump 4 can be suppressed, it is possible to achieve both improvement in workability during assembly and maintenance and stability of attachment of the suction strainer 5 to the pump 4.

  The present invention is not limited to the embodiment described above.

  For example, the number and arrangement of the ridges constituting the retaining portion are arbitrary as long as one end thereof faces the suction strainer. In addition, instead of using the protrusions that can be raised from the bottom of the tank to form the retaining part, the part on the opposite side of the pump is raised above the other part across the tip of the suction strainer on the bottom of the tank. The shape of the retaining part can be used if it is possible to prevent the suction strainer from coming off by hitting the tip of the suction strainer against one end edge of the raised part, such as a retaining part formed by the raised part. The arrangement may be arbitrarily set.

  In addition, in the embodiment described above, the retaining portion is formed by the protrusion formed by raising the bottom portion of the resin tank, but the retaining member is provided on the bottom surface of the metal tank by welding or sheet metal processing. The present invention may be applied to a tank formed of various materials.

  In addition, various changes may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Hydraulic pressure device 3 ... Tank 31 ... Detachment part (projection)
4 ... Pump 5 ... Suction strainer

Claims (1)

A tank for storing the hydraulic fluid therein, a pump that is a power source for supplying the hydraulic fluid to the drive target from within the tank, and for taking in and out the hydraulic fluid between the tank and the drive target. And a suction strainer in which a base end portion is fitted into the pump, wherein the suction strainer is prevented from coming off at a portion of the tank corresponding to the distal end portion of the suction strainer. A hydraulic device provided with a retaining portion for performing.

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