JPH0251603A - Cylinder - Google Patents

Abstract

PURPOSE:To make it possible to perform locating and holding operations at an arbitrary position by installing a check valve and a relief valve which can be opened forcibly between an oil chamber on the rear side of piston admission, an oil chamber on the front side of piston admission and a hollow portion of a piston rod respectively. CONSTITUTION:A check valve 7 is installed between an oil chamber A on the rear side of piston 2 admission and a hollow portion of a piston rod 3. In addition, a relief valve 8 is installed between an oil chamber B on the front side of piston 2 admission and a hollow portion of a piston rod 3. An operating rod 11 which opens the check valve 7 and relief valve 8 forcibly in order is provided for this piston rod 3. This makes it possible to change over a cylinder, according to a stroke position of the operating rod 11, to three states: a freely expandable and contractable state, a contraction locked state and an expansion and contraction locked state, thus allowing the cylinder to be located and held at an arbitrary position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cylinder used as a positioning and supporting member for various types of equipment.

(Prior art) A tilt gun installed between the hull and the outboard motor for positioning and supporting the outboard motor for a boat is, for example, a piston that is slidably housed in the cylinder body and has oil chambers on both sides. A cylinder is known in which a communicating orifice and a relief valve are provided, a piston rod connected to the piston projects axially from the cylinder body, and gas is sealed in the upper part of the oil chamber above the piston (Japanese Patent Publication No. 1983-1999). No. 5480).

In this Tilt Gunpa, the orifice provided in the piston provides a moderate amount of resistance to the expansion and contraction of the piston loft, smoothing the rotation of the outboard motor, and the relief valve opens when the expansion load exceeds a certain level, preventing the outboard motor from becoming damaged. Alleviates the impact when colliding with objects. In addition, the gas sealed in the upper part of the cylinder body compensates for oil volume fluctuations caused by piston sliding, and pressurizes the hydraulic oil on both sides of the piston. It is designed to assist in lifting the external engine.

(Problem to be solved by the invention) However, in this tilt gunpa, the oil chambers on both sides of the piston are always in communication with each other through oriais, so even though the outboard motor can be set in the propulsion position and the floating position,
It is not possible to stop the outboard motor at an intermediate rotational position. Therefore, it is impossible to set the outboard motor at a desired angle depending on the water depth, etc., unless a support member is prepared separately. Even when applied to items other than outboard motors, it is difficult to apply this method to devices that need to be held at any intermediate position.

Additionally, if the outboard motor is rotated in the opposite direction to move the boat backward or to apply the brakes to forward motion, the tilt gun will extend due to the large extension load exerted by the thrust in the opposite direction, so the outboard motor will not be There was also the problem that it could not be held in position.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a cylinder that can be positioned and held at any telescopic position and that can select the support state at the holding position. .

(Method Pi for Accomplishing the Problems) The present invention combines a hollow piston rod with a piston that is slidably housed inside a cylinder body, so that the piston rod is slidably protruded from the cylinder body, and A check valve that communicates an oil chamber A defined inside the cylinder body with a hollow part of the piston rod, and an oil chamber B in front of the piston entry.
The piston is equipped with a relief valve that communicates with the hollow part of the piston rod, and is filled with gas that pressurizes the hydraulic oil in oil chambers A and B. An operating rod that forcibly opens the valves in sequence is provided through the piston rod, and a positioning means is provided for setting the stroke position of the operating rod.

(Function) When the check valve and the relief valve are opened by operating the operating rod, the oil chambers A and B communicate with the hollow portion of the piston rod, so that the piston can expand and contract as desired in accordance with the applied external force. *Since large pressure acts on oil chambers A and B,
The piston is urged in the direction of extension due to the difference in pressure receiving area.

When only the relief valve is closed by operating the operation loft, the flow of hydraulic oil from the oil chamber B to the hollow portion of the piston rod is prevented, so that the cylinder is locked from contraction and only expansion is possible. During the extension operation, the hydraulic oil in the contracting oil chamber A flows into the hollow part of the piston rod, but the hydraulic oil in the expanding oil chamber B
If the pressure difference between the inside and the hollow part is lower than the relief pressure of the relief valve, the relief valve will not open and the hydraulic oil will not flow into the oil chamber B. Therefore, the pressure in the oil chamber B becomes negative and the piston expands once. Even if it slides to the side, it returns to its original position as soon as the extension load is released. On the other hand, when the pressure difference between the oil chamber B and the hollow part exceeds the relief pressure of the relief valve, the hydraulic oil in the hollow part pushes open the I-no-7 valve and flows into the oil chamber B. In this case, the piston remains in the extended position even after being released from the extension load.

Further, when the check valve and the relief valve are closed by operating the operating rod, the flow of hydraulic oil from the oil chambers A and B is prevented, so that the operation of the cylinder is locked in both the expansion and contraction directions.

(Embodiment) FIGS. 1 and 2 show an embodiment in which the present invention is applied to a tilt gun for an outboard motor.

In Fig. 1, 1 is a cylinder body filled with hydraulic oil;
2 is a piston that is slidably housed in the cylinder body 1;
A hollow piston rod 3 is connected to the piston 2 and projects freely from the cylinder body 1.

The inside of the cylinder body 1 is defined by the invading piston 2 into an oil chamber A at the rear and an oil chamber B at the front. The hollow portion of the piston rod 3 is defined by a freely slidably housed 7-lead piston 4 into an oil reservoir chamber 5 filled with hydraulic oil and an air chamber 6 filled with compressed air. In addition,
A plug 2 in which a spring 21 that urges the free piston 4 toward an oil reservoir chamber 511 passes through an air chamber 6 to define an air chamber 6
It is housed in the darkness with 2 and 7 Lee piston 4.

A gate 2Δ communicating with the oil sump chamber is formed in the center of the piston 2.The oil chamber A is connected to the oil sump chamber 5, and the oil chamber B is connected to the oil sump chamber 5. The δ relief valve 8 is connected to this 11 part 11 part 2Δ. 1. From the upper oil chamber 8 side of the oil chamber 8 to the relief valve 8 (supported by the spring 2B of the dog oil chamber B) 2A is provided with 101 mm, and the valve seats 9 and 10 are provided with seating numbers. Also, the check valves 7 and 7 have protrusions 7A and 8 in their inner holes in the valve seats 9 and 10.
The protrusions 7A and 8A of the protrusion 15 and the protrusion 1 pass through the valve seat 9 and lO and protrude into the inner part of the recess 2A.

Insect, Illi intensely in sequence Gu S Tsukuben 7 and Lily -7 valve 8! Is there any operation means and LC destination?
The operation l Abdo 11 with the cam part at +% is the piston V:J
y) Open the hollow part of 1'3 and open it. Operation 1λ
γ11' 111 The 7 Lee piston 4 housed in the hollow part is on the side! The tip of the piston 20 reaches four parts 2Δ12, and the piston 22:
, i, elastic 1. -Support me. Tadashi j-1 71 protrusion 7A on the cam part at the tip of this,
! = 8Δ and retract A1, etc., and the tapered bottom parts 13 and 14 are formed. The distance between the lift parts 13 and 14 is set so that after the projection 7Δ is retreated, the L-'j 7 ) part 14 is able to retreat the projection 8A. It's narrow,, *ta. , the proximal end of the operation port γI'll protrudes in the axial direction from the proximal end of the hood 3 facing the piston with a sliding force.

An i-large bracket 15 is attached to the piston mouth γ1 position 3, and an operating lever 16 is attached to this bracket 15 via a pin 17 so that it can be rotated freely. The operating lever 16 is also formed on the cover plate 15 as shown in FIG. 2. A dog handle 19 is fixedly attached to the indentation part 1-5 through the inlet. The protruding end of the operation 1]7 door 11 protruding from the piston port γF3 (A5, contacts the operation 1 collar IG with the opening of this bottle 17 and the hole 18, and the positioning means and the By operating the control lever 16, which moves simultaneously within the range of 1B, I
Furthermore, the spider is shown in Figure 2.

B) Both K) portions of hole 18 (1) operation rod 1
1 Close both F7 and Lily 7 valve 8.
Corresponding to the double position and the open position, is it a faithful dog? The protrusion 23 on the front part of the valve 3 holds the operating valve 1rii in the old position. Eight Rui Order 1.7 Explain and explain the action.

Outboard (when the handle is rotated 1°, IJ, grip the handle 19 and move the operating lever 16 to the left hole 18f shown in Fig. 2). ! Motion 1
-1 mark 7) When pushing the rear spring 12 into the piston l:I+7)'3, parts 13 and 14 will be removed.41. Guwa. Tsu 87AF:
, 8A and polish the check valve 7 and relief valve 8.

When the external force is applied to the 20th state, the piston 2 moves i-, y,
Hydraulic oil is flowing through valve 7 and Lily 7 valve 8 through 15 and 4f, while the direction of external force r: response! − to expand q or 1
J, ; Wang M, however, is free to study on the moon. Fluctuation of oil amount in cylinder stop due to sliding 1 person air chamber 60 volume reduction (1
, 1-. husband? -, the pressure in the air chamber 6 is transmitted through the oil reservoir chamber 5! ,,-'''C oil vA and W U1 etc. 1.<Effect 1-1 Received pressure iM phase difference''Using the stone 2 to the extension side with the lily l''Kero.The extension force 1j of this, outboard Against the weight of 1'
At the end of the rotation, it acts on the piston 2 - so the outboard - rotates smoothly in the up and down directions with a small imitation force! −
Ru.

Extended P at the desired position length of piston mouth γF 3? i sa(・1-
Then, when one handle is turned, the operating port 2V i 1 is pushed back by the repulsion 7j of the return spring i2, and the operating lever 161 comes into contact with the protrusion 23 of the large gay IF hole 18'4.
2) Rotate in the opposite direction and stop at position 6, as shown in Figure 1.
J Tsudo 11 (, l: 7F part i4 is outside from protrusion 8A j1
When the lift part 13 retreats from the protrusion 7A, only the check valve 7 is at the gate D, and the relief valve 7 and the valve 8 are at the opening 1''.
, ``C is there.

Therefore, it is possible for the cylinder to expand due to a load, etc. When the cylinder receives an impact in the direction of expansion, the cylinder 2 will expand and
・, m, oil chamber A sends hydraulic oil to oil chamber 5 via f,*7 well 7]@Jη! -1 Oil chamber Y3 expands 71. -, if the pressure difference between the oil M chamber 5 and the expansion 1-filter oil chamber B is smaller than the relief pressure of the relief valve 8,
The relief valve 8 does not open, and this pressure difference exerts a restoring force on the piston 2 that has been displaced to the extension side. Therefore, the extended cylinder contracts again to its original position ra when the load is released. Therefore, when the outboard motor collides with driftwood or the like while sailing, the outboard motor rotates upward to cushion the impact, and immediately returns to its original propulsion position after the driftwood has flown away. On the other hand, the pressure difference between the oil reservoir chamber 5 and the expanding oil chamber B causes the relief valve 8
When the relief pressure exceeds , the +717-7 valve 8 opens to allow the hydraulic oil in the oil reservoir chamber 5 to flow into the oil chamber B. Therefore, in this case, even after the shock is absorbed, the cylinder does not return to its original position, and the outboard motor also remains in an upwardly rotated state.

In this way, in the forward movement cylinder 25, the support characteristics of the cylinder vary depending on the setting of the relief pressure of the relief valve 8, and as a result, the higher the relief pressure, the higher the cylinder's recovery ability, and the lower the relief pressure, the smaller the impact. It will be able to be absorbed.

Therefore, the relief pressure of the I-no-7 valve 7 depends on the balance of these characteristics and the expected magnitude of the shock! Determine by taking into account factors such as 1.

By the way, when the outboard motor is rotated in the opposite direction to move the boat backward or to apply a brake to the forward motion of the boat, the thrust of the outboard motor acts in the opposite direction to that when moving forward, and the cylinder is subjected to an extension load based on this thrust. acts. In such a case, operate the handle 19 in synchronization with a control lever (not shown) that rotates the outboard motor in the reverse direction, and move the rearward bonosian 26 beyond the protrusion 23.
Set to . As a result, the operating rod 11, which has been urged by the return spring 12, moves back further, and the bottom part 1
3 comes off from the protrusion 7A, the check valve 7 is closed.

As a result, in addition to the hydraulic oil in the oil chamber B, which has already been prevented from flowing out by the I-no-7 valve 8, the hydraulic oil from the oil chamber A is also prevented from flowing out, and the sliding movement of the piston 2 is restricted to either expansion or compression. It is also locked in direction. Therefore, the cylinder does not extend due to thrust acting in the opposite direction to the forward movement, and the outboard motor is reliably held in the propulsion position.

By the way, the above operation allows the outboard motor to be held at any rotational angle within the rotational range, making it possible to navigate shallow waters.

Figure 3 shows another embodiment of the present invention, in which the hollow part of the piston rod 3 is used as an oil reservoir chamber 5 for hydraulic oil and a gas chamber for compressed air without interposing the piston 4. This is a sealed air chamber 6. By positioning the piston rod 3 upward during actual installation, the gas in the air chamber 6 can be prevented from entering the oil chambers A and B, and even if air bubbles are to be mixed in, it can be prevented over time. It is separated together and returns to the upper air chamber 6. By removing the 7-Lee piston 4 and the spring 21 in this manner, the structure of the hollow portion can be simplified.

Fig. fi4 shows still another embodiment of the present invention, in which the hollow part of the piston rod 3 is connected to a gas spring device 29 serving as a spring means through a hose or the like.
One chamber 5' isolated by a Lee piston 4 is connected to the hollow portion of the piston rod 3 2, and a gas such as air is sealed in the other chamber 6' via a pulp 20.

(Effects of the Invention) As described above, the present invention provides a check valve in the space between the oil chamber A behind the piston entry inside the cylinder body and the hollow part of the piston rod, and the check valve in the oil chamber B in front of the piston and the piston rod. A relief valve is provided at the opening to the hollow part, and an operating rod is provided that forcibly opens the check valve and relief valve in sequence, so depending on the stroke position of the operating rod, the cylinder can be freely expanded or contracted, or locked only in contraction. It can be switched to three different states: a locked state and a state where both expansion and contraction are locked. For this reason, when using this cylinder to support the rotation of an outboard motor, for example, it is not only possible to rotate and hold the outboard motor in any position, but also to adjust the direction of the outboard motor's thrust when moving forward or backward. It exhibits excellent functions as a cylinder for positioning and support, such as being able to change the support state.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cylinder showing an embodiment of the present invention, and FIG. 2 is a side view of a bracket. FIG. m3 and FIG. 4 are longitudinal sectional views showing other embodiments, respectively. DESCRIPTION OF SYMBOLS 1... Cylinder body, 2... Papiston, 3... Piston rod, 5... Oil reservoir chamber, 6... Air chamber, 7...
...Check valve? A, 8 A...protrusion, 8...
Relief valve, 11... Operating loft, 13.14...
+77 ) section, 15...Bracket, 16...Operation lever 18...Id hole, A, B...Oil chamber. (1 other person) Procedural amendment (voluntary) Showa 6311- ■, Indication of the case 1988 Patent Application No. 149753 2, Name of the invention Cylinder 3, Person making the amendment Relationship to the case Patent applicant name (092) Kayabae Gyo Co., Ltd. 4, Agent 77112 Day 7, Contents of the amendment (1) From page 5, line 17 to line 18 of the specification: ``... remains in the extended position even after being released.'' This has been corrected to say, ``...even after being released, it does not completely return to its original position.'' 2) "Relief valve 7" on page 11, line 20 of the specification should be corrected to "relief valve 8." (3) On page 13, line 17 of the specification, “Free piston 4
Correct "J" to "free piston 4°". (4) In the specification, Figure 4 of the attached drawings is amended as shown in the attached sheet. The "Detailed Description of the Invention" column and drawings in the specification to be amended.

Claims (1)

[Claims] A hollow piston rod is coupled to a piston housed in a slidable manner inside the cylinder body, and the piston rod is slidably protruded from the cylinder body, and the oil chamber A defined inside the cylinder body at the rear of the piston enters the piston. The piston is equipped with a check valve that communicates with the hollow part of the rod, and a relief valve that communicates the oil chamber B in front of the piston with the hollow part of the piston rod. The piston rod is provided with an operating rod that penetrates the piston rod and forcibly opens the check valve and the relief valve sequentially according to the stroke position, and also includes positioning means for setting the stroke position of the operating rod. A cylinder characterized by: