JPS6136503A - Fluid pressure actuator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Pinching" The present invention relates to a fluid pressure actuator.

More specifically, the present invention relates to an actuator for a door operating mechanism, a door operating mechanism incorporating a fluid pressure actuator, etc., but is not necessarily limited thereto.

As a type of passenger door for commercial road vehicles such as large buses and regular buses, the leaf is mounted on a mechanism that holds the leaf approximately parallel to the door frame.
plug door with leaf door
doors) are becoming increasingly widely used.

Said mechanism is conveniently in the form of a pivot link for moving the leaf part across the door frame and, in the final stage of the closing movement, engaging sealing means provided around the door frame. To ensure that the door is held in its closed position, a locating member attached to the door leaf part and the frame engage each other by a final small upward movement of the door leaf when the door leaf part reaches the closed sealing position, solidifying the door. to hold.

A hydraulic actuator for a door operating mechanism of the type described above is disclosed in British Patent Specification CB 2014231.A. The actuator has a vertical hydraulic cylinder and causes the piston rod to project upwardly into a cylindrical pivot column to which the pivot lever of the door leaf is fixed. The cylinder piston is prevented from rotating, and the upper end of the rod is provided with a helical driving portion that rotates the column as the piston rises to close the door. The limit of rotation is reached when the door leaf closes against the frame, and the remaining small amount of movement of the piston causes the door leaf, together with the column, to rise into engagement with the positioning member. In the above-mentioned operating sequence, the cylinder force which rotates the closing door leaf is considerably lower than the cylinder pressure required to lift it, and vice versa.
The closing door leaf section is forward deflected in that it freely descends away from the positioning member while the opening torque is applied to it. However, if the above conditions change, for example due to obstruction of the door part, the resistance to the pivoting closing movement increases substantially, or due to friction, 1. The proper sequence of actuation may be disrupted, such as if the door tends to become stuck in the raised position when opened.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel fluid pressure actuator that eliminates the problems of the conventional actuators described above.

SUMMARY OF THE INVENTION In order to achieve the above object and other objects detailed below, one aspect of the present invention provides a working chamber, a piston that is slidable in the axial direction within the working chamber, and a piston and the working chamber. and means for permitting rotational movement of the driving member over most of the stroke of the piston, but restricting its axial movement;
An actuator is provided having a hydraulic cylinder configured to constrain rotational movement of the drive member while permitting axial movement thereof during the remainder of the piston's stroke.

Further, in the pond aspect of the present invention, a working chamber and a piston that is slidable in the axial direction within the working chamber are provided, the piston is connected to a driving member, and the driving member is rotated, It is configured to move in the direction of its rotation axis, and the piston and drive! The connection between the members is made between the first cam means for rotation of said member and a portion of the stroke of the piston relative to the working chamber until a predetermined position of relative rotation is reached.
An actuator is provided having a hydraulic cylinder comprising a piston comprising means for constraining movement and allowing linear movement during the remainder of the piston's stroke, and further cam means between the drive member.

Said another cam means includes a circumferential guide concentric with the axis of rotation of the drive member that engages the follower, and said rotational movement causes the follower to align therewith, so as to allow only rotational movement between the follower and the guide. an axial guide projecting from the circumferential guide and cooperating with the follower, whereby the drive member is restrained against rotational movement while being free to move in the axial direction together with the piston. It may be configured as follows.

Conveniently, the upper ga axial guide acts as a locking member that limits the linear movement of the drive member.

Furthermore, the first and further cam means may conveniently be formed by a guide member in the drive/movement member, in particular a slot.
In a preferred embodiment, both said cam means are arranged axially beyond the pressure cylinder. .

EXAMPLE Below, the structure of the present invention will be explained with reference to the accompanying drawings for one example.

The actuator includes a fluid pressure cylinder 2 consisting of a closed chamber formed by a cylindrical member 4 clamped between upper and lower end plates 6 and 8, and a head 12 that is in close contact with the inner wall of the cylindrical member 4.
Piston rod 1 protrudes through sealing hole 16 of upper end plate 6
It consists of 4. The outer tube 18 is fastened between the upper end plate and the top end plate 20 which is coaxial with the cylinder 2.
Fixed by 2. The fastening force between the top end plate 20 and the bottom end plate 8 on the outer tube 18 and the cylinder member 4 is provided by a helical tie rod 24 extending between the top end plate 20 and the bottom end plate 8 . An outer cover 25 is also held between the end plates 6.degree. 20 and surrounds the outer tube.

The protruding terminal of the piston rod is attached to the cross-shaped pin 26 along with a pair of inner and outer bushings 28 and 30 arranged symmetrically on the piston rod.
supporting. The outer tube 18 has a pair of diametrically opposed annular slots 32, and along substantially its entire length, a pair of outer bushings 30° are slidably engaged in the slots so that the piston 10 cannot rotate therein. It's Nishide.

The drive tube 40 is arranged concentrically with the outer tube and is slidably locked by a pair of inner bushes 28. It has diametrically opposed helical slots 42. The chain tube is rotatably supported at its lower end on a thrust bearing 44 and projects from a bush 46 in the upper plate 20, where it is supported laterally. In the position illustrated in FIG. Ball 52 stopped
protrudes into the recess. Thus, centrifugal movement of the drive tube is prevented even though the ball 52 allows axial rotation of the drive tube.

Air ports 60, 62 are provided in the upper and lower end plates and supply compressed air to the cylinder 2 on one or the other side of the piston, allowing the piston to reciprocate within the cylinder. During this operation, the slot 32 in the outer tube L8 holding the cruciform bottle 26 prevents the piston from rotating.

At the same time, while being locked by the ball 52 of the recess 48, the drive tube cannot move in the axial direction. The axial movement of the piston thus results in a rotation of the drive tube through the locking of the cruciform pin 26 in the helical slot 42. Axial movement of the piston from the bottom position shown in FIG. 1 toward maximum stroke rotates the drive tube through the angle of slot 42, in this case 1556.

There are boreholes 58 extending axially downward in two diametrically opposed positions of the circumferential recess 48, and the actuating tube is
As the rising cruciform pin approaches the top of the helical slot, the bore is supported by engagement with the ball 52.

As the piston continues its upward movement to its maximum stroke, the entire drive tube rises with the piston. While preventing excessive rotation of the drive tube, the perforation locks the ball, thereby allowing this vertical movement.

When the movement of the piston is reversed, the borehole 58 still prevents rotation, so that the drive tube initially descends in a meticulous direction simultaneously with the piston and the ball 52 is again moved into the circumferential recess 48.
line up in a straight line. Only in this state will the drive tube be free to rotate, allowing the cruciform pin to lower its helical slot and cause the drive tube to rotate. As soon as the borehole and the ball are out of alignment, the vertical movement of the drive tube is again blocked. Continuation of rotation and linear motion means that the piston itself
It remains this way at all times as long as a single linear stroke is performed between its limits.

As mentioned above, the actuator is intended to be used to drive a plug door operating mechanism (not shown). The mechanism is such that the leaf part moves from the closed position.
Alternatively, the door leaf portion is held generally parallel to the door frame portion while being moved to its closed position, and the movement between the beginning stage of the opening movement and the final stage of the closing movement is carried out across the door opening. between the closed positions, the door leaf portion engages sealing means provided around the door frame portion;
It is placed substantially on the same plane as the vehicle body side. The rotation imparted by the actuator is achieved by movement in the conventional manner via a parallel chain, i.e. a pivot axis (not shown) located on one side of the door frame section with an axis substantially perpendicular or parallel to one end adjacent to the door. ) to bring about the drive that is conveniently routed through. For connection to the shaft, drive tube 40 has a pair of dogs 64 on the top end plate. The dog engages a supplementary lower end connection (not shown) of the door pivot shaft. The pivot axis extends to at least a substantial height of the door to more evenly distribute the force from the drive torque over the door leaf portion.
It has a number of corresponding links fixed to the door.

When used in such an arrangement, the actuator position shown in FIG. It is operated by creating an air outlet above the piston. The closed position of the door is such that the cross-shaped bottle 26 is located in the slot 42 in the drive tube.
When the top is reached, it is substantially reached. The pressure cylinder piston still has to fulfill its stroke and, as already mentioned, 1. At that time, the drive tube cannot rotate and is only free to move upwards. In this final vertical movement, the drive tube is raised approximately 10++ oe and an anti-rattle positioning member (not shown) is locked between the door frame portion and the door leaf portion.

In this way, it is preferable that the positioning member forms female and male wedge members on each of the door leaf portion and the door frame portion, and the top line of the door frame portion is provided on a plane parallel to the door opening. The parts on the door leaf part each have a complementary shape.

A number of such positioning elements are provided on both sides of the door in order to securely hold the door leaf against any movement when the door is closed or the vehicle is moving.

Especially when the door is opened or closed, during the first opening movement when the weight of the door leaf acts to accelerate the movement, and during the final stage of the closing movement when there is a risk of hitting, entering or leaving the door. , it is desirable to prevent very strenuous exercise.

The actuator is therefore provided with means to dampen the movement at the end of the piston stroke, forming seals 70.72 on the upper and lower end plates 6.8, respectively. During the downward movement of the piston, a large diameter portion 74 at the tip of the piston rod 14 engages the seal 72 as the piston approaches the end of its stroke. The large diameter portion closes off a space 76 through which a main passage 78 extending from the air port 62 communicates with the cylinder. In the residual movement of the piston, the liquid in the main cylinder space below the piston tip can only flow out through the outlet 80.

Air port 60 in the upper end plate is connected to the interior of the cylinder, as is air port 62, and its outlet 80 is also shown in FIG. When the piston is raised, a sealing sleeve tube 84 in the piston rod has a large diameter section spaced above the piston head, allowing the air port 60 to pass through the main cylinder space above the piston head. The seal 70 closes off the main passageway extending to the main passageway. As a result, liquid in that space can only exit through the outlet 82. However, in this case, the large diameter portion of the sleeve tube 84 is exposed to the seal 7 before the piston reaches its maximum position.
0? 1 pass. Therefore, during the final part of the piston movement, liquid flows freely out of the space above the piston head, thus removing the rear pressure damping. During the ascent of the piston, the AT thrust section is designed to effect the final pivoting closing movement of the door leaf section. Removal of the rear pressure occurs simultaneously with the raising of the door leaf after the pivoting closing movement of the door leaf has been completed. Therefore, the maximum pressure of the actuator is applied so as to secure the door 9 to the door part to the anti-rattle positioning member as soon as the door is closed.

The seals 70, 72 are each formed by a thin-walled annular lip sloping towards the piston head. - When the piston head moves away from either end position, the compressed liquid contained behind the adjacent seal 7o or 72 easily deforms the inclined slip. Therefore, from the moment it begins to leave the end position, the compressed liquid acts on the main area of the piston head and the acceleration of the piston is no longer limited by the outflow velocity from the adjacent outflow valve.

The up and down movement at the end of the actuator stroke can also be used to operate microswitches or other sensing devices to indicate door position or cause other movements. Thus, the spool valve 88 fixed to the elbow plate 90 and engaging the door is arranged to be switched to activate the door lock when the upward movement of the door leaf is completed.

It will be appreciated that the actuator and door operating mechanism described above may be modified in many ways within the scope of the invention, and that the actuator itself may be used for other operating mechanisms.

Therefore, the present invention has the configuration as described in detail in the above embodiments, and can achieve the intended purpose.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view of the actuator according to the present invention, FIG. 2 is a side view of the actuator in the second direction, FIG. 3 is a side view of the drive tube of the actuator, and FIG. 4 is a side view of the actuator in the second direction. FIG. 2 is a cross-sectional view showing the air port at the lower end of the pressure cylinder of the actuator. 2... Cylinder, 6... Upper end plate, 8...
・・Lower end plate, 10−・・Piston, 12−
...Piston head, 18...Outer tube, -20...
Top end plate, 28.30...button, 40...
・Drive tube, 62...Air port, 70.72・
...Seal, 76...Space.

Claims (10)

[Claims] (1) A fluid pressure cylinder consisting of a working chamber, a piston (10) that is slidable in the axial direction within the working chamber, and a drive member (40) that can be displaced by relative movement between the piston and the working chamber. (2) an actuator having means (48, 52,
58), the actuator is configured to restrain the rotational movement of the drive member over the remaining portion of the stroke of the piston, while allowing its axial movement. (2) A working chamber and a piston (10) that is slidable in the axial direction inside the working chamber are provided, and the piston is connected to the driving member (4).
0) to rotate the drive member (40),
An actuator having a hydraulic cylinder (2) described for movement in the direction of its axis of rotation, the connection between the piston and the drive member being connected by first cam means (2) for rotation of said member by the piston. 26, 24), which is provided between the piston and the drive member, during a portion of the stroke of the piston relative to the working chamber, and which restrains linear movement in the axial direction until a predetermined position of relative rotation is reached. , further comprising cam means (48, 52, 58) for permitting said linear movement during the remainder of the piston's stroke. (3) The actuator according to claim 2, wherein the circumferential guide is arranged concentrically with the rotation axis of the drive member, and the follower (52) engages with the cam means further provided. (48), and is configured to allow only rotational movement between the follower and the guide. (4) The actuator according to claim 3, wherein the axial guide (58) is made to protrude from the circumferential guide, and when the follower is aligned with it due to the rotational movement, the follower An actuator characterized in that a driving member (40) is restrained from rotational movement and is movable together with a piston in an axial direction. (5) The actuator according to claim 4, wherein the axial guide acts as a limiting locking member with respect to linear movement of the drive member. (6) The actuator according to any one of claims 2 to 5, wherein the first cam means and/or the further provided cam means are arranged in a slot ( 42, 48, 58) or the like. (7) The actuator according to any one of claims 2 to 6, wherein the cam means (26, 4
2, 48, 52, 58) are disposed in the axial direction beyond the fluid pressure cylinder (2). (8) The actuator according to any one of claims 1 to 7, for decelerating the movement of the piston during the rotational movement of the drive member immediately before the axial movement. , damping means (70, 82, 84) are provided in the cylinder, the damping means being arranged to be inoperative when the piston enters the remainder of its stroke and undergoes axial movement; An actuator featuring: (9) The actuator according to claim 8, wherein the buffer member includes a seal member (70) surrounding the rod (14) of the piston, and a head (12) of the piston.
a sealing sleeve (84) forming an annular projection on the piston rod spaced apart from the piston rod, the projection cooperating with a sealing member to seal the main fluid passageway from the space adjacent the piston; At least a buffering effect is produced, and the protrusion crosses the sealing member at the final part of the piston stroke, thereby restoring the fluid path from the main fluid passage of the sealing member and removing the buffering effect. An actuator featuring: (10) Any one of claims 1 to 9
The door leaf (doo
A plug door consisting of a leaf part and a frame part.
a plug door, the rotational movement of the drive member opens and closes the door, and the axial movement of the drive member engages and engages an antirattle locator while the door is in the closed position. each positioning member is configured by a male wedge member and a female wedge member provided on the door leaf portion and its frame portion, and the wedge member of the door frame member is provided with a top line on a surface parallel to the door opening; A plug door characterized in that the line is inclined upward toward the door leaf portion, and the wedge member of the door leaf portion has a complementary shape.