JPS6236944Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a door checker.
Previously, the first door checker of this type was the
As shown in Publication No. 25181, a pinion gear connected to an arm attached to a door is engaged with the rack teeth of a piston inserted into a cylinder, and
A portion of the rack teeth are missing teeth, and an uncut outer peripheral surface is left on the pinion gear, and when the door is rotated by a predetermined angle, the missing teeth of the rack teeth and the uncut outer peripheral surface of the pinion gear are frictionally engaged. It has been proposed that the door can be held in the open position by

However, with this structure, the door is held in the open position by the frictional force between the missing tooth part of the rack tooth and the uncut outer circumferential surface of the pinion gear, so the holding force is weak and when strong winds etc. It is extremely dangerous as it will suddenly rotate in the closing direction.

This invention was developed in view of the above circumstances, and its purpose is to enable the door to automatically close within a predetermined angle range, and to maintain the door in that position when the door is opened beyond a predetermined angle. To provide a door checker capable of increasing the door holding force.

Embodiments of the present invention will be described below with reference to the drawings.

A cylinder hole 2 is formed in the main body 1, and the openings at both ends of the cylinder hole 2 are respectively closed with lids 3 and 4, and a piston 5 is slidably inserted into the cylinder hole 2. A first chamber 6 and a second chamber 7 are formed.

A blind 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 push the piston 5 toward 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. 1
A check valve (ball) 12 is provided to prevent oil from flowing toward the chamber 6, and lock teeth 13 are formed on the lower surface of the outer peripheral wall of the piston 5 in the longitudinal direction.

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

The first chamber 6 and the second chamber 7 are communicated with each other through first and second passages 16 ₁ and 16 ₂ bored in the main body 1 and an oil hole 17 bored in the piston 5, respectively. A flow rate regulating valve 18 is provided in each of the two passages 16 ₁ and 16 ₂ .

A large diameter hole 20 is formed on the other lid 4 side of the cylinder hole 2, and a cam 21 is fitted and fixed in this large diameter hole 20.

The cam 21 is a cylindrical stepped cam comprising a small diameter cam surface 21a having the same diameter as the inner peripheral surface 2a of the cylinder hole 2, and a large diameter cam surface 21b having a larger diameter than the inner peripheral surface 2a. There is.

A screw hole 22 that is continuous with the communication hole 11 is formed in the bottom wall 9 of the piston 5, and a small diameter protrusion 23 that is concentric with the screw hole 22 is formed.
A cylindrical roll cam 24 is fitted into the small diameter protrusion 23, and a number of balls 25 are arranged in the circumferential direction on its peripheral surface, kept at regular intervals by a partition plate 31, and are held in place by a cap 26 screwed into the screw hole 22.

That is, as shown in FIG. 3, the roll cam 24 has an approximately drum-shaped outer peripheral surface 24a having tapered portions a and b that are gradually higher from the center toward both ends.
A large number of balls 25 are arranged on the outer circumferential surface 24a, and each ball 25 is kept at a constant interval by a partition plate 31, and both end surfaces 24b, 24'b
A pair of springs 27, 27' are brought into contact with each other, and the pawl piece 27a of one spring 27 is pressed against every other ball 25 through the notched groove 28 formed in one end surface 24b, and the pawl piece 27' of the other spring 27' is pressed. a
The remaining balls 2 are removed from the notch groove 28' formed on the other end surface 24'b at a position shifted from the notch groove 28.
5', every other ball 25, 25' rides up on the inclined surfaces a and b on both sides of the outer circumferential surface 24a and is pressed and held in contact with the cam 21, and the other spring 27' is pressed against the piston bottom. On one end surface 9' of the wall 9, one spring 27 is pressed by a cap 26 against both end surfaces 24b, 24b of the roll cam 24, respectively.

Note that the cap 26 has a communication hole 11 connected to the second chamber 7.
A hole 29 communicating with is bored.

Next, the operation will be explained.

In the illustrated state, the door A is closed. When the door A is opened from this state, the pinion gear 15 rotates in the direction of arrow A, and the piston 5 slides in the direction of arrow B against the spring force and hydraulic pressure. do.

At this time, the oil in the first chamber 6 pushes open the balls 12 through the communication hole 11 and flows out into the second chamber 7 through the hole 29, and each ball 25 pushes the ball 12 open through the communication hole 11 and flows out into the second chamber 7. Since the piston 5 is in contact with the piston 5, the contact resistance is small and the piston 5 can be slid with a small force.

If we remove the force that opens door A in this state,
Since the piston 5 can be slid with a small force as described above, it 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 is automatically closed. Rotate.

At this time, the oil in the second chamber 7 flows out into the first chamber 6 through the second passage 16 ₂ , the large diameter hole 14 and the oil hole 17 , and when the door A closes to a certain extent, the second passage 16 ₂ flows into the piston. 5 is closed, and the first passage 16 ₁ is opened, so that the oil in the second chamber 7 flows from the first passage 16 ₁ to the first passage 16 1.
It flows out into the chamber 6.

Note that since the second passage ₁₆₂ opens into the large diameter hole 14, the oil in the second chamber 7 flows out into the first chamber 6 through the large diameter hole 14, and the oil in the second passage 162 opens into the large diameter hole ₁₄ . Since the flow rate adjustment valve 18 provided in the first passage 161 is adjusted to allow a large flow rate to flow, the piston 5 slides at high speed, and the door A rotates at _high speed to the closing side. Since the is adjusted so that a small flow rate flows, the piston 5 slides at a low speed, and the door A rotates 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.

Further, when the door A is opened further than the above state and the piston 5 is slid, each ball 25 comes into contact with the small diameter cam surface 21a of the stepped cam 21, that is, the piston 5 slides by _L1 . When the door A is opened by an angle corresponding to (for example, the position shown in FIG. 1), the ball 25 comes into contact with the small diameter cam surface 21a.

For this reason, the contact resistance between the ball 25 and the stepped cam 21 becomes large, and when the force to open the door A is removed, a sliding force is applied to the piston 5 by the spring 10 in the direction of the arrow C, as shown in FIG. As shown, each ball 25 rides up and rolls along one tapered portion a of the roller cam 24 and comes into strong contact with the small diameter cam surface 21a, and the piston 5 becomes in a state where it does not slide unless a large force is applied. Due to the restoring force of the spring 10, the piston 5 is fixed at that position without sliding in the direction of arrow C.

Door A is therefore held in its open position.

Further, when closing the door A from the above-mentioned open position, it is sufficient to close the door A with a strong force so that a sliding force greater than the contact friction force between the above-mentioned ball 25 and the small diameter cam surface 21a acts on the piston 5. .

Also, when the door A is opened further than the above-mentioned opening position, the remaining ball 25' rides up and rolls along the other tapered part b and comes into strong contact with the small diameter cam surface 21a, as shown in FIG. However, in the same way as described above, it is sufficient to open the door A with a large force, and the door A can be opened to the maximum opening position.

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.

Further, balls 25 are provided between the tapered portions a and b of the roll cam 24 and the small diameter cam surface 21a of the stepped cam 21.
Since the door A can be held in the open position by increasing the sliding resistance of the piston 5 by press-contacting the door A, the holding force can be increased.

Incidentally, as shown in FIG. 6, the balls 25 may be pushed by an annular rubber member 30 every other ball to each end side.

That is, an annular rubber material 30 is loosely fitted into the center of the roller cam 24, and balls 25 are arranged every other ball on both sides of the rubber material 30, so that the restoring force of the rubber material 30 causes every other ball to It is configured to be pushed in one direction on both ends.

The present invention is as described above, and when door A is opened within a predetermined angle range to a predetermined intermediate position, door A
If the force is removed, the door can be automatically rotated to the closing side, and the door can be held in the open position at a predetermined angular position between the predetermined intermediate position and the maximum open position. Also,
Tapered parts a and b of roll cam 24 and stepped cam 21
Since the plurality of balls 25 are pressed between the small-diameter cam surface 21a and the door A is held in the open position, the holding force is strong and the door A does not open or close suddenly due to strong winds or the like.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is an overall sectional view, Figure 2 is a longitudinal sectional view, Figure 3 is an exploded perspective view of the roll cam part, Figures 4 and 5.
The figure is an explanatory view of the operation, and FIG. 6 is a perspective view showing another embodiment of the roll cam portion. 1...Body, 2...Cylinder hole, 5...Piston, 6, 7...First and second chambers, 10...Spring, 1
1...Communication hole, 13...Rack tooth, 15...Pinion gear, 21...Stepped cam, 21a...Small diameter cam surface, 21b...Large diameter cam surface, 24...Roll cam, 25...Ball, a, b...Tapered part.

Claims (1)

[Scope of utility model registration request] A piston 5 having a rack tooth 13 is fitted into a cylinder hole 2 of a main body 1 to form first and second chambers 6 and 7, and oil is sealed in the first chamber 6 and second chamber 7. , the piston 5 is urged to slide toward the second chamber 7 by a spring 10, and a rotating pinion gear 15 connected to the door A is attached to the main body 1 by the rack teeth 13.
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 slides toward the first chamber 6.
In the door checker configured to slide toward the second chamber 7, the piston 5 is formed with a communication hole 11 that communicates the first chamber 6 and the second chamber 7, and the communication hole 11 is connected to the second chamber 7. A check valve 12 is provided to prevent oil from flowing to the first chamber 6, and the first chamber 6 and the second chamber 7 are communicated through a passage bored in the main body 1 and an oil hole 17 bored in the piston 5. Said cylinder hole 2
A stepped cam 21 having a small-diameter cam surface 21a and a large-diameter cam surface 21b is attached to the piston 5, and the piston 5 is provided with a pair of tapered portions a and b that become higher in sequence from the center toward both ends on the outer peripheral surface. A roll cam 24 is provided, and a plurality of balls 25 are arranged on the outer peripheral surface of the roll cam 24, and
A means is provided for urging some of the balls 25 toward one tapered portion a side and urging the remaining balls 25 toward the other tapered portion b side. A door checker characterized in that the positional relationship is such that when the piston 5 slides toward the first chamber 6 by a predetermined stroke _L1 , the two come into pressure contact with each other.