JP2525872Y2 - Hydraulic jack - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a hydraulic jack,
In particular, the present invention relates to a base in which the thickness of the base is set to a minimum necessary size to facilitate processing and reduce cost.

[0002]

2. Description of the Related Art As a conventional hydraulic jack, for example, a hydraulic jack, there is one disclosed in Japanese Utility Model Laid-Open No. 183495/1984. This relates to a cylindrical manually operated hydraulic jack and has a configuration as shown in FIG. First, there is a tank 101. The lower end opening of the tank 101 is closed by a base 103, and the upper end opening is closed by a cap 105. A cylinder 107 is concentrically disposed inside the tank 101, and a ram 109 is accommodated in the cylinder 107 so as to be movable in the vertical direction in the figure. In the figure, reference numeral 111 denotes a pump means, and reference numeral 113 denotes a discharge valve. Further, the base 103 has flow paths 115, 11
7. A valve 119 is provided. The tank 101 is filled with a working oil 121 as a working fluid.

In the above configuration, when the pump means 111 is reciprocated in the vertical direction in the figure, the hydraulic oil 121 filled in the tank 101 is supplied below the ram 109, whereby the ram 109 is raised. Thereby, a desired jack function is exhibited. On the contrary,
To release the rise of the ram 109, the discharge valve 113 is operated to open it. Thereby, the ram 109
Is lowered by its own weight, and the hydraulic oil supplied below the ram 109 is discharged into the tank 101.

[0004]

According to the above conventional configuration, there are the following problems. As described above, channels 115, 117 and the like are formed in the base 103, and various functional components such as the discharge valve 113 and the valve 119 are provided therein. Therefore, the base 103
Is the size of the various functional components and the flow paths 115, 1
There is a problem in that the size is limited by the size of the drill for forming 17 and the like, and the thickness of the base 103 is increased.

More specifically, in the case of various functional parts, there is a limit to the miniaturization of the functional parts from the viewpoints of securing their functions and quality assurance and problems in processing. For example, if the discharge valve 113 is made too thin, the screw may be cut during operation. On the other hand, the flow path 115,
With respect to 117 and the like, there is a problem that if this is made too thin, it will bend during machining with a drill.
From such a point, it is necessary to increase the thickness of the base 103 to such an extent that it is not originally required.

Further, as described above, the flow paths 115, 11
Processing work such as 7 was extremely difficult. In particular, when the flow paths intersect, it is necessary to perform a wasteful process, for example, it is necessary to cross the straight drill holes and then close an arbitrary opening with a blind plug.

The present invention has been made based on such a point, and the object thereof is to make it possible to reduce the thickness of the base to the minimum necessary size and to facilitate the processing of the flow path. It is to provide a hydraulic jack capable of.

[0008]

In order to achieve the above object, a hydraulic jack according to the present invention is provided with a tank containing a working fluid, a cylinder disposed in the tank, and movably contained in the cylinder. Ram, a base fixed to the lower part of the tank, various flow paths are formed and various functional parts are attached, and hydraulic oil in the tank attached to the base is sucked and supplied to the lower part of the ram. Pump means, comprising:
The base has a laminated structure of a plurality of plate members, and a groove is formed in an arbitrary plate member, and another plate member is joined to this plate member to form a desired flow path. Is what you do.

[0009]

The base of the hydraulic jack according to the present invention has a structure in which a plurality of plates are laminated. When forming various flow paths, a groove is machined in an arbitrary plate, and another plate is joined to the groove. As a result, the groove is closed to form a desired flow path. The number of plate members may be determined as necessary, and the grooves may be formed in various shapes, such as a groove formed in the plate member or a groove formed by punching. Things are conceivable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, there is a hollow cylindrical tank 1, which is filled with a working oil 3 as a working fluid. The upper end opening 5 of the tank 1 is
And the lower end opening 9 is
It is closed by 1. The tank 1 is provided with a filler port 13, and a plug 15 is attached to the filler port 13.

In the tank 1, a hollow cylindrical cylinder 1 is provided.
The lower end of the cylinder 17 is fixed to the base 11 by welding. A ram 19 is accommodated in the cylinder 17 so as to be vertically movable in the figure. An O-ring 21 is mounted between the tank 1 and the cap 7, and an O-ring 2 is mounted between the cap 7 and the ram 19.
3 is mounted, and an O-ring 25 is also mounted between the cylinder 17 and the ram 19.

The base 11 has a structure in which a plate 27 and another plate 29 which is thinner than the plate 27 are joined. Then, a groove is formed on the plate body 27 side, and the groove is closed by the plate body 29, thereby forming a desired flow path. Specifically, as shown in FIGS. 2 and 3, grooves 31, 33, and 35 are formed on the plate body 27 side. By joining the plate body 29 thereto, the suction channel 37, the supply channel 3
9, constituting the discharge channel 41. The plate 27
As a means for joining the first and the second to each other, there are heat fusion welding, copper brazing, chemical bonding, amorphous metal diffusion bonding and the like.

As shown in FIGS. 1 and 2, a suction port 43 is formed on the side of the plate 29 at the position of the suction flow path 37. Above the suction port 43, the suction port 43 shown in FIGS. As shown in FIG. 3, a pump means 45 is provided.
The pump means 45 includes an operation lever 47, a rod 51 connected to the operation lever 47 and movably accommodated in a cylinder 49, a suction valve 53 mounted at a position immediately above the suction port 43, and the like. ing.

A supply port 55 is formed at the end of the supply passage 39 on the plate 29 side. When the operation lever 47 is rotated counterclockwise in FIG. 1, the suction valve 53 opens, and the hydraulic oil 3 in the tank 1
It is sucked into 9. Next, when the operation lever 47 is rotated clockwise in FIG. 1, the suction valve 53 is closed, and the hydraulic oil 3 in the cylinder 49 is supplied to the ram 19 via the supply port 55 and the supply passage 39. It is supplied below. As a result, the ram 19 rises. Another supply port 57 is formed in the plate body 29 below the ram 19, and a supply valve 59 is attached immediately above the supply port 57. By the action described above, the supply flow path 3
When the hydraulic oil 3 is supplied to the pump 9, the supply valve 59 is opened, and the ram 19 is supplied through the supply port 57 and the supply valve 59.
Will be supplied below.

As shown in FIG. 3, a discharge valve 61 is provided between the suction passage 37 and the discharge passage 41. The discharge valve 61 is not mounted inside the base as in the related art, but is mounted on a housing 62 separately provided on the base 11. When the hydraulic jack is operated, the discharge valve 61 is in a closed state. Then, to release the operation of the hydraulic jack, the discharge valve 61 is opened. Thereby, the discharge channel 41 and the suction channel 37 are communicated, and the lower part of the ram 19 is communicated with the tank 1. Therefore, the ram 19 descends by its own weight, whereby the hydraulic oil 3 is discharged from the discharge passage 41 and the suction passage 37.
Through the tank 1.

According to the present embodiment, the following effects can be obtained. First, the thickness of the base 11 can be reduced. This is different from the conventional method in which the flow path is not formed by machining with a drill, but the plate bodies 27 and 2 are formed.
This is because a desired flow path is formed by joining the flow path 9 with the base material 9. That is, the grooves 31 and 3 are formed on the plate 27 side.
This is because the suction passage 37, the supply passage 39, and the discharge passage 41 are formed by forming the plates 3 and 35 and joining the plate 29 to the plate 27 in this state. Further, in the case of the present embodiment, since the discharge valve 61 is mounted on the housing 62 different from the base 11, the thickness of the base 11 can be reduced.

Also, the operation for forming the flow path is extremely simple. In the case of machining with a conventional drill, it was necessary to carefully work so that the flow path was not bent. In the case of this embodiment, however, the grooves 31, 33, 3
5, the operation is extremely simple and the accuracy is high. In order to construct the base 11, it is not necessary to use a thick one as in the prior art, but a relatively thin plate 27 and a plate 2 which is thinner than that.
9 can be joined, so that the material cost can be reduced. Further, the cost required for processing is greatly reduced due to the simplification of the work.

The present invention is not limited to the above embodiment. First, in the above-described embodiment, the groove is formed by making the lower plate 27 relatively thick, but the groove may be formed by making the upper plate 29 thicker. In the embodiment, the two plate members 27, 2
9 to form a desired flow path, for example, by joining three plate bodies, forming a groove penetrated by press punching in the center plate body, A desired flow path may be configured by sandwiching this from both sides in a sandwich shape with another plate body. Further, the number of the plate members may be increased, and a desired flow path may be formed at an arbitrary level position by an arbitrary plate member. Further, the present invention can be similarly applied to a hydraulic jack other than the hydraulic jack.

[0019]

As described in detail above, according to the hydraulic jack of the present invention, the base has a laminated structure of a plurality of plate members, a groove is formed in an arbitrary plate member, and another plate member is formed on this plate member. Are joined to form a desired flow path, so that the thickness as a base can be reduced, and the work required for the flow path configuration can be facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hydraulic jack according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view.

FIG. 4 is a side view showing a conventional hydraulic jack with a part cut away.

[Explanation of symbols]

 Reference Signs List 1 tank 3 hydraulic oil (working fluid) 11 base 17 cylinder 19 ram 27 plate body 29 plate body 31 groove 33 groove 35 groove 37 suction flow path 39 supply flow path 41 discharge flow path 45 pump means

Claims (1)

(57) [Scope of request for utility model registration] 1. A tank for storing a working fluid, a cylinder disposed in the tank, a ram movably stored in the cylinder, and various flow paths fixed to a lower portion of the tank. A hydraulic jack equipped with a base on which various functional parts are mounted, and pump means mounted on the base for sucking hydraulic oil in the tank and supplying the hydraulic oil below the ram; A hydraulic jack characterized in that a desired flow path is formed by forming a groove in an arbitrary plate member and joining another plate member to this plate member with a laminated structure of the plate members.