JPH0467053B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a pressure regulating device for hydraulic equipment including a cylinder such as a hydraulic cylinder or a hydraulic absorber and a piston.

OBJECTS OF THE INVENTION An object of the present invention is to provide a new pressure adjustment device for hydraulic equipment that can easily adjust the pressure and has a simple and compact mechanism.

Structure of the Invention In order to achieve the above object, the present invention includes a cylinder housed in a casing, a piston rod with a piston attached therein arranged so as to be reciprocally movable, and a piston rod having a diameter larger than that of the insertion part and the insertion part. The cylinder cap consists of a large diameter part and a smaller diameter part, and the fitting part is attached to one end of the cylinder. An insertion hole for inserting the piston rod is provided at the axial center position of the cylinder cap, and the insertion hole is formed through the cylinder cap. A hydraulic oil passage is formed between the inner circumferential wall of the piston rod and the outer circumferential surface of the piston rod, and the piston rod rotates about the movement axis of the piston rod with respect to the end surface of the cylinder cap on the opposite cylinder side within the mounting cylinder. a valve member having a guide hole that is removably mounted; and a valve member that is rotatably mounted to an end surface of the valve member on the opposite side of the cylinder about a movement axis of the piston rod, and is operated to rotate together with the valve member. surrounded by a connected rotating sleeve and communicated with the hydraulic oil passage;
A circulation chamber is formed into which the hydraulic oil flows through the hydraulic oil passageway, and a stepped portion of the end surface on the side opposite to the cylinder of the large diameter portion of the cylinder cap is provided with a step portion in which the hydraulic oil flows into the circulation chamber through the guide hole of the valve member. At least one constricted portion communicating with the cylinder cap is recessed, and at least one slit communicating with the constricted portion is cut out in the outer circumferential surface of the large diameter portion of the cylinder cap, and the hydraulic fluid passageway, circulation chamber, and guide are provided. A passage for hydraulic oil is formed by a hole, a constriction, and a slit, and the rotary sleeve is positioned on the same axis as the rotary sleeve.
A manual operation grip is operatively connected so as to rotate together, and there is a space between the grip and the rotation sleeve so as to hold the guide hole of the valve member and the throttle part of the cylinder cap in opposing positions. The valve member is provided with a holding portion for positioning and holding the valve member.

Embodiment Hereinafter, a first embodiment in which the present invention is embodied in a hydraulic absorber will be described in detail with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes an absorber body, and 2 denotes a pressure adjustment device that is attached to the tip of the absorber body 1 and together constitutes a hydraulic absorber.

Reference numeral 3 denotes a cylindrical casing constituting the outer peripheral surface of the absorber body 1, and a cylindrical cylinder 4 formed to have approximately the same length as the casing 3 is housed inside the casing. Note that a hydraulic oil flow portion E is formed between the peripheral wall of the cylinder 4 and the peripheral wall of the casing 3. A piston rod 5 is arranged to be able to reciprocate within the cylinder 4. A piston 6 is fixed to the base end of the piston rod 5, and the tip extends outward through a pressure regulating device 2 to be described later. Reference numeral 7 designates a movable mounting portion fixed to the exposed end of the piston rod 5, and reference numeral 8 indicates a fixed mounting portion fixed to the base end surface of the casing.

The pressure regulator is configured as follows.
Reference numeral 9 denotes a cylinder cap that is fitted and fixed to the tip of the cylinder 4, and an insertion hole 10 through which the rod 5 is inserted is provided in the center of the cylinder cap. This cylinder cap 9 consists of a fitting part 11 that is press-fitted into the tip of the cylinder 4, a large diameter part 13 having a larger diameter than the fitting part 11, and a small diameter cylindrical part 12 having a smaller diameter than the large diameter part 13. There is. Also, the insertion hole 10
is formed with a slightly larger diameter than the rod 5, and the insertion hole 1
A hydraulic oil passage 14 is formed between the inner circumferential wall of the rod 5 and the outer circumferential surface of the rod 5, and a recess 15 having a larger diameter than the insertion hole 10 is formed inside the fitting portion 11. 16 is a plurality of slits formed at equal angles on the outer peripheral surface of the large diameter portion 13 of the cylinder cap 9; 17 is a plurality of slits formed at equal angles on the step surface between the large diameter portion 13 and the small diameter cylindrical portion 12. , a plurality of constricted portions having mutually different sizes, and are formed so as to communicate with the slit 16.

Reference numeral 21 denotes a mounting cylinder for the pressure regulating device 2 that is fitted and fixed to the tip of the casing 3 of the absorber body 1, and an annular gap having a predetermined distance is formed between the cylinder 4 and the outer peripheral surface of the cylinder 4 at its base end. An opening 22 is provided in this manner, and a fitting protrusion 23 is formed on the outer peripheral surface of the distal end thereof. In addition,
Reference numeral 21a is a holding recess provided on the distal end surface of the mounting tube 21, and 21b is an indicator similarly provided on the outer peripheral surface of the attachment tube 21. Details of these 21a and 21b will be described later.

Reference numeral 24 denotes a bowl-shaped grip rotatably fitted onto the distal end of the mounting tube 21;
A pair of grip pieces 24 in a half-split state as shown in the figure.
It is formed by integrally assembling a and 24b with a connecting ring 25. Reference numeral 26 denotes a fitting groove formed on the inner peripheral surface of the grip 24 as shown in FIG.
3, the grip 24 is held in a non-removable manner with respect to the mounting tube 21.

Reference numeral 27 indicates a plurality of positioning pieces (six pieces in this embodiment) protruding from the outer peripheral surface of the base end of the grip 24, and are used in correspondence with the indicators 21b of the mounting tube 21.

Reference numeral 28 denotes a concave accommodation hole provided on the inner surface of the tip end of the grip 24 so as to correspond to the alignment piece 27, and each accommodation hole 28 has an engagement ball 29 that fits into the holding recess 21a of the mounting tube 21. and a spring 30 that urges the engagement ball 29 in the insertion direction are housed in the engagement ball 29, respectively. Note that these positioning pieces, engagement balls, springs 21a, 29,
30 constitutes a holding member, and when the indicator 21b and the alignment piece 27 are aligned, the rotating position of the grip 24 is held by the engagement of the engagement ball 29 and the holding recess 21a. There is.

Reference numeral 31 denotes a rotating sleeve rotatably housed within the mounting tube 21, and its outer diameter is formed to be approximately the same as the inner diameter of the mounting tube 21. The rotating sleeve 31 is rotatable integrally with the grip 24 via a key K at a small diameter portion 33 that is fitted into the distal end opening 32 of the grip 24. Further, an insertion hole 34 through which the rod 5 is inserted is formed in the center of the rotating sleeve 31, and a large diameter recess 35 is formed at the proximal end of the insertion hole 34. Reference numeral 36 denotes a thick-walled annular rubber packing press-fitted into the large-diameter recess 35 of the rotary sleeve 31, and the inner peripheral surface of the rubber packing has serrations to prevent the hydraulic oil A from leaking to the outside of the tip side. An oil drain portion 36a is formed. Furthermore, the mounting tube 21 and the rotating sleeve 3 are disposed in an annular groove 37 formed in the outer peripheral surface of the rotating sleeve 31.
A seal ring 38 is fitted in order to prevent the hydraulic oil A that has entered the gap between the two parts 1 and 1 from leaking to the outside.

39 is the small diameter cylindrical portion 12 of the cylinder cap 9.
It is a cylindrical valve member that is rotatably fitted onto the outside of the valve member, and has an annular step 40 on the inner circumferential surface of its distal end, and a large diameter recess 41 formed on the distal end side of the annular step 40. The inner end of this valve member 39 is connected to the key 3
It is fixed to the rotary sleeve 31 by a connecting means such as 9a, and is surrounded by the large diameter recess 35 of the rotary sleeve 31, the large diameter recess 41 of the valve member 39, and the end surface of the small diameter cylindrical portion 12 of the cylinder cap 9. A circulation chamber 42 is formed which is connected to the hydraulic fluid passageway 14 . Reference numeral 43 denotes a guide hole extending from the step 40 of the valve member 39 to the proximal end side, the tip of which communicates with the circulation chamber 42 , and the hydraulic oil passage 4 and the circulation chamber 4 .
2. A passage for hydraulic oil A is formed by the guide hole 43, the constricted portion 17, and the slit 16.

Reference numeral 44 denotes a compression spring interposed between the washer 45 covering the rubber packing 36 and the valve member 39 in the circulation chamber 42, and the spring force of the compression spring 44 causes the valve member 39 to press against the cylinder cap 9. It is pressed.

Now, the operation of the pressure regulating device 2 in the hydraulic absorber configured as described above will be explained.

As shown in FIG. 1, when the grip 24 is rotated and one of the positioning pieces 27 is aligned with the index 21b of the mounting tube 21, as shown in FIG. is fitted into the holding recess 21a, and the operating position of the grip 24 is determined.
Further, as the grip 24 is rotated, the rotary sleeve 31 is integrally rotated by a predetermined angle via the key K, and the valve member 39 is rotated integrally therewith via another key 39a. , the guide hole 43 of the valve member 39 matches a desired constricted portion of the constricted portion 17 of the cylinder cap 9. and,
In this state, the piston 6 of the absorber body 1
For example, when the hydraulic oil A in the cylinder 4 is moved toward the right in FIG. After flowing out into the mounting cylinder 21 through the hole 43, the throttle part 17 of the cylinder cap 9, and the slit 16, it passes through the opening 22 of the mounting cylinder 21 and flows into the hydraulic oil inlet/outlet part E. Therefore, at this time, the pressure of the hydraulic oil A that corresponds to the size of the constricted portion 17 acts on the piston 6 of the hydraulic absorber.

Further, when the piston 6 is moved to the left, the hydraulic oil A in the hydraulic oil inlet/outlet E flows into the cylinder 4 in the reverse order to that described above.

Next, in this state, when the grip 24 is rotated and the positioning piece 27 reaches a position where it does not match the mark 21b of the mounting tube 21, the guide hole 43 of the valve member 39 is connected to the constricted portion 17 of the cylinder cap 9. The constricted portion 17 is closed by the proximal end surface of the valve member 39. Therefore, the movement path of the hydraulic oil A between the inside of the cylinder 4 and the hydraulic oil inlet/outlet portion E is blocked, the piston 6 becomes immovable, and the movable mounting portion 7 is held in a locked state.

Furthermore, when the grip 24 is rotated to align the next positioning piece 27 with the mark 21b of the mounting tube 21, the guide hole 43 of the valve member 39 faces the next constricted portion 17 of the cylinder cap 9. do. Therefore, since the guide hole 43 is connected to the constricted portion 17 having a size different from that described above, the flow rate of the hydraulic oil A is controlled according to the size of the constricted portion 17, and the flow rate of the hydraulic oil A is controlled to act on the piston 6. The hydraulic pressure is adjusted.

In this way, as the grip rotates,
By appropriately changing the throttle recess 17 of the cylinder cap 9 that communicates with the guide hole 43 of the valve member 39,
The force for operating the piston 6 of the hydraulic absorber in this invention can be easily adjusted. Furthermore, with the above-described configuration, the valve member 39 and the grip 24 are rotated around the movement axis of the piston 6, so that the absorber body 1 and the pressure adjustment device 2 can be connected to each other, as is clear from FIG. can be arranged on the same axis, and the whole can be constructed compactly. Therefore, when installing this hydraulic absorber in various devices, the installation space can be reduced.

Further, since the hydraulic oil A flows into the circulation chamber 42 and presses the valve member 39 against the cylinder cap 9, the force of the compression spring 44 does not need to be particularly strong.

Next, the second embodiment of this invention will be explained in the third and fourth embodiments.
This will be explained according to the diagram.

In this embodiment, as shown in FIG. 4, a constricted portion 17 having an approximately annular groove shape and having a closed terminal end 47 is recessed in the distal end surface of the large diameter portion 13 of the cylinder cap 9. The starting end 48 of the communicating hole 46
This embodiment differs from the first embodiment in that it communicates with the slit 16 at the slit 16. As shown in FIG. 5, the depth of the constricted portion 17 becomes shallower as it extends from the starting end 48 to the terminal end 47, and the valve member 39
The guide holes 43 communicate with each other at arbitrary locations, and the flow rate of the hydraulic oil A is determined by the depth of the constricted portion 17 at this communicating location. When the piston moves to the right, the hydraulic oil A that has flowed into the constricted portion 17 flows through the constricted portion 17 toward the communication hole 46 and passes through the slit 16 of the cylinder cap 9 and the opening 22 of the mounting tube 21. , hydraulic fluid flow section E
flow within. Further, the guide hole 4 of the valve member 39
3 is located between the starting end 48 and the ending end 47 of the throttle part 17, that is, in the part of the throttle part 17, the hydraulic oil A
The flow of is stopped.

Therefore, depending on the depth of the constricted portion 17, the piston 6
The hydraulic pressure acting on the is adjusted. This hydraulic pressure can be adjusted steplessly over the entire length of the constriction part 17, but in this embodiment, it is possible to adjust the hydraulic pressure steplessly over the entire length of the constriction part 17.
1a so that the rotational position of the grip 24 can be maintained, and the mounting tube 2 is provided in correspondence with these.
Eighteen indicators 21b are provided protruding from the outer circumferential surface of 1.

Effects of the Invention As detailed above, the present invention has the following effects.

(a) Since the cylinder, piston, valve member, and grip are located on the same axis, the whole can be made more compact, and it does not require a larger operating space than a grip with an eccentric grip. This allows the installation space to be reduced when installing it in various devices.

(b) Since the cylinder, piston, valve member and grip are arranged on the same line,
Design, processing, and assembly can be performed based on the same axis, and manufacturing management can be easily performed.

(c) Since the throttle part is recessed in the end face of the cylinder cap on the side opposite to the cylinder, installation is easy because it is only necessary to place the end face of the valve member and the end face of the cylinder cap in contact with each other.

(d) Because the configuration is simple, failures are less likely to occur.
It is highly reliable and maintenance free.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention, FIG. 2 is an enlarged sectional view showing the configuration of a pressure regulating device, and FIG. 3 is an enlarged sectional view taken along the line - in FIG. 2. FIG. 4 is a partially cutaway front view showing the second embodiment, FIG. 5 is an enlarged sectional view taken along the line - in FIG. 4, and FIG. 6 is a developed view of the constriction section. Casing…3, cylinder…4, piston rod…5, piston…6, cylinder cap…9,
Insertion hole...10, hydraulic oil passage...14, slit...
16, Aperture part...17, Mounting cylinder...21, Opening part...2
2. Valve member...39, Circulation chamber...42, Guide hole...
43, Hydraulic oil...A, Hydraulic oil inlet/outlet part...E.

Claims (1)

[Scope of Claims] 1. A cylinder 4 is housed in a casing 3, and a piston rod 5 to which a piston 6 is attached is disposed within the cylinder 4 so as to be able to reciprocate; Diameter part 13
and a small-diameter portion 12 having a smaller diameter than this, and an insertion hole 10 for inserting the piston rod 5 is provided at the axial center position of the cylinder cap 9 with the fitting portion 11 attached to one end of the cylinder 4; A hydraulic oil passage 14 is formed between the inner circumferential wall of the insertion hole 10 and the outer circumferential surface of the piston rod 5, and a piston rod is formed within the mounting tube 21 against the end surface of the cylinder cap 9 on the side opposite to the cylinder. a valve member 39 having a guide hole 43 rotatably mounted around a movement axis of the valve member 3 ;
9 is surrounded by a rotating sleeve 31 which is rotatably attached to the end face of the piston rod 9 on the opposite cylinder side around the movement axis of the piston rod 5 and is operatively connected to rotate integrally with the valve member 39; A circulation chamber 42 is formed which communicates with the hydraulic oil passage 14 and into which the hydraulic oil A flows through the hydraulic oil passage 14, and a stepped portion on the end surface of the large diameter portion 13 of the cylinder cap 9 on the side opposite to the cylinder is formed. The valve member 39 is provided with at least one constriction portion 17 that communicates with the circulation chamber 42 through the guide hole 43, and the cylinder cap 9 has at least one constriction portion 17 on the outer circumferential surface of the large diameter portion 13. at least one slit 1 communicating with
6 is notched, and the hydraulic oil passage 14, the circulation chamber 42, and the guide hole 4
3. A passage for hydraulic oil A is formed by the constricted portion 17 and the slit 16, and a manual operating grip is attached to the rotary sleeve 31 so as to rotate together with the rotary sleeve 31 on the same axis. A valve member 39 is operatively connected to the grip 24 and the rotating sleeve 31 so as to hold the guide hole 43 of the valve member 39 and the constricted portion 17 of the cylinder cap 9 in opposing positions. A pressure adjustment device for hydraulic equipment, characterized in that holding portions 21a, 28, and 29 are provided for positioning and holding.