JPH0452387Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a door checker.

Prior art A piston is provided in the cylinder hole of the main body.
A second chamber is formed, oil is sealed in the first and second chambers, and a piston is linked to the door to restrict the flow of oil between the first and second chambers, thereby opening the door. Door checkers designed to hold the door are known.

However, with this door checker, when regulating the flow of oil between the first and second chambers, the temperature of the oil rises due to the temperature of the outside air, and the volume of oil expands, causing the oil to flow between the first and second chambers. The oil pressure (in other words, the internal pressure of the main body) will become high, which may cause oil leakage from the seal part or damage the main body, and the first and second chambers may not be completely filled with oil (full). If the oil is not injected, the position in which the door is held will not be constant, and the oil injection process is troublesome, and the oil level must be constantly checked, which is troublesome.

Purpose of the invention It is an object of the present invention to prevent the internal pressure of the main body from increasing due to a rise in oil temperature, and to make it possible to constantly fill the first and second chambers of the main body with oil.

[Structure of the idea]

A cylindrical needle guide 20 is airtightly attached to the inner surface of one lid 3 that closes the cylinder hole 2, and a needle 22 that closes the communication hole 11 of the piston 5 is airtightly held in the needle guide 20. The stroke of the needle 22 is restricted by the elongated hole 24 and the pin 25, and the spring 23 is used to urge the free piston 52 into the chamber 52.
An air damper B biased toward the a side is provided, and its chamber 52a is communicated with the first chamber 6, and the spring 5
The spring force of No. 4 is set to be weaker than the spring force that biases the needle 22 that blocks the first chamber 6 and the second chamber 7.

Embodiment FIG. 1 is an overall cross-sectional view of a door checker according to the present invention, in which a cylinder hole 2 is formed in a main body 1, and openings at both ends of the cylinder hole 2 are connected to lids 3 and 4.
The cylinder holes 2 and 2 are respectively closed.
A piston 5 is slidably inserted therein to form a first chamber 6 and a second chamber 7.

A hole 8 that opens into the first chamber 6 is formed in the axis of the piston 5, and a spring 10 is elastically loaded between the bottom wall 9 of the hole 8 and one lid 3 to move the piston 5 to the other lid. The bottom wall 9 is provided with a communication hole 11 that communicates the first chamber 6 and the second chamber 7. A check valve (ball) 12 is provided to prevent oil from flowing toward the chamber 6, and the piston 5
Rack teeth 13 are formed on the lower surface of the outer peripheral wall in the longitudinal direction.

The main body 1 is formed with a large diameter hole 14 that is continuous with the cylinder hole 2 and is perpendicular to the cylinder hole 2,
A pinion gear 15 that meshes with the rack teeth 13 is fitted into the large diameter hole 14.
5 is connected to the door A via a link mechanism (not shown).

The first chamber 6 and the second chamber 7 communicate with each other through first and second passages 16 ₁ and 16 ₂ bored in the main body 1, an oil hole 17 formed in the bottom wall 9 of the piston 5, and the communication hole 11, respectively. and the first and second passages 1
Flow control valves 18 are provided at 6 ₁ and 16 ₂ , respectively. 12a is a pin for preventing the ball 12 from coming off.

That is, the piston 5 has a large-diameter bottom wall 9, a large-diameter tip portion 5a, and a small-diameter intermediate portion 5b. An annular chamber 2a is formed between the annular chamber 2a, which communicates with the large diameter hole 14, and an oil hole 17 formed in the bottom wall 9 and the communication hole 1.
The ball 12 of the cylinder hole 2 communicates with the hole 8 through the portion closer to the piston tip 5a, and thereby the portion of the cylinder hole 2 closer to the lid 3 of the piston 5, the blind hole 8, the annular chamber 2a, and the large diameter hole 14. A first chamber 6 is defined by the piston 5, and a second chamber 7 is defined between the bottom wall 9 of the piston 5 and the other lid 4.

The first passage 16 ₁ is a hole 16 ₁ bored in the main body 1
and the first port 16 ₁ b opened to the cylinder hole 2.
and a second port 16 ₁ c that opens into the second chamber 7, and a tip-shaped flow rate regulating valve 1 is installed in the hole 16 ₁ a.
8 is inserted, and by tightening and loosening the flow rate adjustment valve 18 to increase or decrease the gap between the hole 16 ₁ a and the flow rate adjustment valve 18, the flow rate flowing through the first passage 16 ₁ can be adjusted. It is adjustable.

The second passage 16 ₂ is formed at a different position from the first passage 16 ₁ and is formed in a hole 16 ₂ bored in the main body 1.
a, and the first port 16 ₂ b communicating with the large diameter hole 14
and a second port 16 ₂ c that opens into the cylinder hole 2, and a flow rate adjustment valve 18 is provided in the hole 16 ₂ a so that the flow rate flowing therethrough can be adjusted in the same way as the first passage 16 ₁ .

The one lid 3 is provided with a long needle case 20 facing into the hole 8 of the piston 5, and a needle 22 is slidably inserted into the shaft hole 21 of the needle case 20. The needle 22
is biased by a spring 23 so that its tip 22a protrudes from the needle case 20, and the needle case 20 has a pin 25 for adjusting the maximum opening angle that is slidably inserted into the elongated hole 24 of the needle 22. At the same time, air is sealed in the shaft hole 21. 26 is a receiving plate made of resin material such as urethane,
The shaft hole 21 is kept airtight.

The bottom wall 9 of the piston 5 has first and second chambers 6,
7 are provided, and the first check valve 30 has a pusher 32 fitted into a stepped hole 31 in the bottom wall 9 as shown in FIG. ,
A poppet 33 is provided in the pusher 32, and the poppet 33 is pressed by a spring 34 to a seat seat 35 made of a resin material such as urethane provided in the step 31a of the stepped hole 31. The flow to the first chamber 6 is blocked. That is, the hole 35a of the seat seat 35 opens into the first chamber 6 through the oil hole 36, and the push button 32 opens into the second chamber 7.

As shown in FIG. 2, the second check valve 40 is constructed by fitting a pusher 42 into a stepped hole 41 in the bottom wall 9 of the piston 5, providing a poppet 43 inside the pusher 42, and holding the poppet 43 in place with a spring 44. A seat seat 45 made of a resin material such as urethane provided on the pushbutton 42
It has a structure in which the first chamber 6 is in pressure contact with the second chamber 7, and prevents the flow from the first chamber 6 to the second chamber 7. That is, the hole 45a of the seat seat 45 opens into the second chamber 7, and the pushbutton 42 opens into the first chamber 6 through the oil hole 46.

A blind hole 50 is formed in the main body 1, and the blind hole 50 communicates with the large diameter hole 14 through a hole 51, and a free piston 52 is slidably inserted thereinto. A spring 5 is inserted between the cap 53 screwed into the threaded part 50a of the hole 50.
4 is provided, and air is sealed in a chamber 55 between the cap 53 and the free piston 52, constituting an air damper B communicating with the first and second chambers 6 and 7. .

Note that the spring 54 has a weaker spring force than the spring 23.

Further, a contact piece 27 made of a resin material such as urethane is provided on the bottom wall 9 of the piston 5.
A communicating hole 11 and an open hole 28 are formed in the opening.

Next, the operation will be explained.

The state shown in FIG. 1 is the state in which the door A is closed. When the door A is opened from this state, the pinion gear 15 rotates in the direction of the arrow A, and the piston 5 is moved in the direction of the arrow B against the spring force and hydraulic pressure. Figures 3 and 4
Slide in sequence as shown in the figure.

At this time, the oil in the first chamber 6 pushes open the ball 12 through the communication hole 11 and flows into the second chamber 7.

Note that when the piston 5 is slid to the position shown in FIG. 3, the oil in the first chamber 6 flows into the second chamber 7 through the first passage ₁₆₁ , and the piston 5 is slid to the position shown in FIG. During operation, the oil in the first chamber 6 flows into the second chamber 7 through the second passage 16 ₂ , and a flow rate regulating valve 18 is provided in the first and second passages 16 ₁ and 16 ₂ . Most of the oil in the first chamber 6 flows through the communication hole 1.
1 pushes the ball 12 open and flows into the second chamber 7.

If we remove the force that opens door A in this state,
The piston 5 is pushed in the direction of arrow C by the restoring force of the spring 10, and the pinion gear 15 rotates in the direction of arrow D, so that the door A automatically rotates toward the closing side.

At this time, in the state shown in FIG. 4, the first passage 16 ₁
Since the first port 16 ₁ b of the piston 5 is closed by the bottom wall 9 of the piston 5, the oil in the second chamber 7 flows through the second passage 1
6 ₂ , flows into the first chamber 6 through the large-diameter hole 14, oil hole 17, and communication hole 11, and closes the door A to some extent and enters the third chamber.
In the state shown in the figure, the second port 16 ₂ c of the second passage 16 ₂ is closed by the bottom wall 9 of the piston 5, and the first port 16 ₁ b of the first passage 16 ₁ is closed by the annular chamber 2 a.
The oil in the second chamber 7 flows out into the first chamber 6 through the first passage ₁₆₁ .

Note that the flow rate adjustment valve 18 provided in the second passage ₁₆₂
is adjusted to have a large flow rate, so the second
A large amount of oil in the chamber 7 flows into the first chamber 6, the piston 5 is slid at high speed, the door A is rotated to the closing side at high speed, and the flow rate regulating valve 18 provided in the first passage ₁₆₁ is closed. Since the oil in the second chamber 7 is adjusted to flow at a small flow rate, a small amount of oil in the second chamber 7 flows into the first chamber 6, the piston 5 is slid at a low speed, and the door A is rotated at a low speed toward the closing side.

Therefore, at the beginning when the door A rotates toward the closing side, it rotates at high speed, and when it approaches the closed position, it rotates at low speed.

Furthermore, the door A is further removed from the state shown in FIG.
is opened and the piston 5 is slid to the position shown in FIG. is L ₁
When the door A is opened by an angle corresponding to the sliding movement (for example, the position shown in FIG. 1), the communication hole 11 is closed.

Therefore, the oil in the second chamber 7 cannot flow out into the first chamber 6, so the piston 5 is fixed at that position.

Door A is therefore held in its open position.

When the door A is further opened from this state, the needle 22 along with the piston 5 slides in the direction of arrow B against the spring 23, and as shown in FIG. cannot move any further, and the piston 5 cannot move any further either.

That is, when the door A rotates from the above-mentioned position to the opening side by an angle corresponding to the sliding stroke _L2 of the piston 5, the door A is stopped at that position and the maximum opening position is determined.

At this time, the oil in the first chamber 6 pushes open the poppet 33 of the first check valve 30 and flows into the second chamber 7.

Further, in order to move the door A held between the maximum opening position and the intermediate position to the closing side, the door A may be rotated to the closing side with a strong force.

That is, as a result, the piston 5 is slid in the direction of arrow C with a strong force, and the pressure of the oil in the second chamber 7 becomes high, and the high pressure oil causes the poppet 43 of the second check valve 40 to move against the spring 44. The piston 5 is slid and the door A can be rotated to the closing side because the door A is pushed open and the oil in the second chamber 7 flows out into the first chamber 6.

As mentioned above, when the door A is opened to a predetermined angle range from the closed state to the predetermined intermediate position, the door A can be automatically rotated to the closing side, and the difference between the predetermined intermediate position and the maximum opening position can be adjusted. When the door A is opened to any predetermined angular position in between, the door A can be held in the open position.

In addition, it prevents the flow of oil between the first and second chambers 6 and 7, and when the oil pressure in each chamber 6 and 7 reaches a set pressure, it opens and allows the oil to circulate, thereby rotating the door. Since it is made to move, the force to hold door A in the open position can be increased, and door A can be easily held in the open position by strong winds.
can be prevented from rotating suddenly.

As mentioned above, if the structure is such that the oil flow between the first and second chambers 6 and 7 is restricted and the door A is held in the open position, the outside temperature and the first and second check valves 30 and 40 are
The temperature of the oil increases and the volume of the oil expands due to resistance when flowing through the oil, etc., so the oil pressure in the first and second chambers 6 and 7 (that is, the internal pressure of the main body 1) becomes high pressure. As a result, oil may leak from the seal portion or the main body 1 may be destroyed.
If the amount of oil in the second chambers 6, 7 is small, the position at which the door A is held will not be constant.

On the other hand, according to the above embodiment, when the volume of oil expands due to a rise in oil temperature, the large diameter hole 14,
acting on the free piston 52 through the hole 51;
The free piston 52 is moved by the spring force of the spring 54 and the chamber 5
Since the volumetric expansion of the oil is absorbed by pushing against the air pressure 5, the oil pressure in the first and second chambers 6 and 7 (that is, the internal pressure of the main body 1) does not become high.

Therefore, it is possible to prevent oil leakage from the seal portion and damage to the main body 1.

Furthermore, since the free piston 52 is urged to slide toward the large diameter hole 14 by the spring force of the spring 54 and the air pressure in the chamber 55, the amount of oil in the first and second chambers 6 and 7 is When the amount of oil is small, it can be slid toward the large diameter hole 14 side to compensate for the lack of oil amount and fill the first and second chambers 6 and 7 with oil.

In other words, part of the oil in the first and second chambers 6 and 7 is supplied to the chamber 52a on the side of the large diameter hole 14 of the free piston 52, and when the amount of oil is small, the chamber 52a
The first and second chambers 6 and 7 can be filled with oil by supplying and replenishing the oil in the first and second chambers 6 and 7.

Therefore, even if the amount of oil in the first and second chambers 6 and 7 is insufficient, the position for holding the door A can be kept constant, making it possible to easily perform oil injection work and to keep the oil constant. There is no need to check the quantity.

Note that the spring force of the spring 54 which urges the free piston 52 is greater than the spring force of the spring 23 which urges the needle 22.
Since the spring force is weak, the needle 22 does not move when the volume of oil in the first and second chambers 6, 7 expands, and the door A can be held at a constant position.

[Effect of idea]

The air damper absorbs the volumetric expansion of oil due to a rise in oil temperature, preventing an increase in the internal pressure of the main body 1. This prevents oil leakage from the sealing part and destruction of the main body 1, and also prevents insufficient oil volume within the main body 1. By compensating for this with an air damper, the first and second chambers 6 and 7 can always be filled with oil.

In addition, the spring force of the spring 54 that biases the free piston 52 constituting the air damper B is weaker than the spring force of the spring 23 that biases the needle 22 for holding the door A in the open position.
When the volume of the oil in the chambers 6, 7 expands, the free piston 52 moves, but the needle 22 does not move, and the holding position of the door A can be kept constant.

Further, the needle 22 is slidably inserted in a needle guide 20 that is airtightly attached to the inner surface of the lid body 3, and the stroke of the needle 22 is regulated by an elongated hole 24 and a pin 25. spring 23
Since the needle 22 is biased to protrude, the maximum sliding stroke of the piston 5 toward the first chamber 6 side can be restricted by the needle 22, and the maximum opening angle of the door can be restricted. The air sealed in the needle guide 20 does not leak when the needle guide 20 is attached to the main body 1 together with one lid 3 or when the needle 22 slides due to the sliding of the piston 5. There is no possibility of air getting mixed into the oil in the second chamber 7 and causing malfunction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall cross-sectional view of the door checker, and FIG.
The sectional view taken along line C and FIGS. 3 to 6 are explanatory views of the operation of the door checker. 1 is the main body, 5 is the piston, 6 and 7 are the first and second
room, A is the door, B is the air damper.

Claims (1)

[Claims for Utility Model Registration] A cylinder hole 2 is formed in the main body 1, lids 3 and 4 are screwed into the openings on both sides of the cylinder hole 2 to close the cylinder hole 2, and the outer peripheral surface of the cylinder hole 2 is closed. A piston 5 having a rack tooth 13 and a hole 8 on its axis is inserted into the piston 5 to form first and second chambers 6 and 7, and the piston 5 is urged to slide toward the second chamber 7 by a spring 10. At the same time, a pinion gear 15 that rotates in conjunction with the door A is provided in the main body 1 so as to mesh with the rack teeth 13, so that when the door A is opened, the piston 5 slides toward the first chamber 6 and when the door A is closed. The piston 5 is in the second chamber 7
A communication hole 11 configured to slide sideways and communicates with the first and second chambers 6 and 7 in the bottom wall 9 of the piston 5.
One longitudinal end of the cylindrical and elongated needle case 20 is attached to the inner surface of the one lid 3 in an airtight manner, and the other longitudinal end is inserted into the hole 8 of the piston 5. A needle 22 that closes the communication hole 11 is slidably inserted into the other end of the needle case 20 in the longitudinal direction while keeping the needle 22 airtight. A pin 25 for adjusting the opening angle is attached to the needle guide 20 so that the needle 22 can freely slide along the needle guide 20 by an amount equivalent to the length of the elongated hole 24, and the needle guide 20 is attached to the bottom wall of the piston 5 by a spring 23. 9
When the piston 5 slides toward the first chamber 6 side by a predetermined stroke L ₁ or more while being biased toward the side, the needle 22 closes the communication hole 11, and the needle 22 closes the communication hole 11, and the needle 22 closes the communication hole 11. In the door checker configured to communicate through first and second check valves 30, 40 which operate to communicate when the hydraulic pressure in the chambers 6, 7 on one side exceeds a set pressure, the blind hole in the main body 1 Free piston 52 inside 50
is inserted into the chamber 52a, and the free piston 52 is biased toward the chamber 52a by the spring 54 to form an air damper B.
communicates with the first chamber 6, and a spring 54 that biases the free piston 52 of the air damper B is set to have a weaker spring force than the spring 23 that biases the needle 22. .