JPS6037877Y2 - Trolley speed control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speed control device for a truck that decelerates and stops a traveling truck by pressing a friction disk against a drive shaft.

The traveling speed of a bogie that travels with a friction disk pressed against the drive shaft is determined by the angle that the line segment connecting the center of the friction disk and the contact point of the friction disk with the drive shaft makes with the axis of the drive shaft. A running bogie was stopped by aligning the center of the friction disk with the axis of the drive shaft, but when the bogie was moved forward and backward under the same conditions, the forward speed of the bogie was greater than the backward speed. Furthermore, it was difficult to decelerate and stop the trolley in the same way when moving forward or backward.

That is, the above relationships are shown in FIGS. 5-7.

In FIG. 5, the friction disk 112 is in the illustrated positional relationship with respect to the drive shaft 4, and when the drive shaft 4 is stopped, the friction disk 12 and the drive shaft 4 are in contact at a point P1. do.

The drive shaft 4 rotates in the direction of arrow X1, and the truck 1 rotates in the direction of arrow F.
When the friction disk 12 is a ring-shaped elastic body, when the friction disk 12 is a ring-shaped elastic body, the contact pressure between the friction disk and the drive shaft causes Elastic deformation occurs in the friction disk, for example, the drive shaft 4 in FIG.
When the drive shaft 4 rotates in the direction of arrow X1 in FIG. 7 from the stopped state, the contact point between the disk 12 and the drive shaft 4 is considered to move from position P1 in FIG. 6 to position P2 in FIG. Therefore, in the case of Fig. 5, when moving forward, the contact point is P2, and if the length per rotation of the shaft 4 is 1, the speed is the contact point P2.
Q is the intersection of tangent 12 and line a2 perpendicular to arrow 1.
2, the length of the arrow a2 becomes the forward speed a2.

Assuming that the friction disk 12 is a rigid body and has no elastic deformation,
The contact point P1 is at position P1), and at this time the speed is a
1, and a2>al.

In addition, when the drive shaft 4 is reversed X2, the truck moves in the direction of arrow R, that is, backward, but at this time as well, it is displaced to the contact point position P3 due to the elastic deformation of the friction disk 12. The speed will be a3.

Therefore, a 3 < a 1 < a 2, and the speed when moving forward is greater than the speed when moving backward.

The larger the contact pressure, the larger the speed difference, and it has been experimentally confirmed that the speed difference is 10 to 30% depending on the contact pressure.

Therefore, in the present invention, the center of the friction disk is aligned with the axis of the drive shaft by moving the speed control cam plate, which has a slope bent toward the outside of the running track of the bogie at both ends, in a direction perpendicular to the drive shaft. There is a system that decelerates the trolley in the same way and stops it at the same position when moving forward or backward.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIGS. 1 and 2 are schematic diagrams showing a bogie, in which a bogie 1 is supported on a track 3 via wheels 2. , orbit 3
A drive shaft 4 is arranged along.

A frame 5 is fixed to the lower surface of the truck 1.
A rod 7 is fixed perpendicularly to the axis of the drive shaft 4 between the side plates 6a and 6b of the bracket 6 which is fixedly suspended from the drive shaft.
A support guide 8 is fitted to the rod 7 in a slidable and rotatable manner, and a bearing housing 9 is integrated with the support guide 8.
The rotating shaft 10 is rotatably supported by a bearing (not shown).
is supported, and a friction disk 12 made of a ring-shaped elastic material is fixed to the lower surface of a disk body 11 formed at the lower end of the rotating shaft 10, perpendicular to the axis of the rotating shaft 10.
The contact surface 12a is formed in a curved shape and inclined at an angle somewhat gentler than the inclination angle of the rotation shaft 10 with respect to a plane perpendicular to the axis of the rotation shaft 10. A spring is applied between a support arm 15 that is supported by a shaft and has a rotatable roller 14 at its tip, and an adjustable plate 17 that is screwed onto a bracket 16 that projects from the rear side of the bearing housing 9. 18, the contact surface 12a of the friction disk 12 is configured to press against the outer peripheral surface of the drive shaft 4, and a guide frame 19 on which the roller 14 runs is provided on the lower surface of the truck 1.

Reference numeral 20 denotes an adjustment bolt screwed onto an adjustment block 21 protruding from the support guide 8, which prevents the friction disk 12 from unnecessarily turning around the rod 7 at the joint of the drive shaft 4, etc. be.

A spring 24 is biased between a fixing pin 22 protruding from the side of the bearing housing 9 and a fixing pin 23 protruding from the lower surface of the truck 1. When moving backward in the right-angled front direction, that is, when the trolley 1 is in a normal running state, the side surface of the support guide 8 that indirectly supports the friction disk 12 is in contact with the side plate 6b of the bracket 6, as shown by the two-dot chain line. controlled.

An arm 26 is rotatably supported on the cam roller support 25 on the side surface of the support guide 8 in the direction of the running track of the truck 1, and a cam roller 27 is rotatably supported on the tip of the arm 26. A speed control cam plate 28 that contacts the cam roller 27 and moves the friction disk 12 in a direction perpendicular to the drive shaft 4 is arranged on the cam frame 29 along the traveling track 3 in correspondence with the position where the truck 1 is stopped. It is set up.

As shown in FIGS. 3 and 4, despite the same conditions, the speed at which the truck 1 travels forward, that is, in the direction of arrow A, is the same as the speed at which the truck 1 travels backward, that is, in the direction of arrow B. The speed control cam plate 28 is larger in comparison, and the running speed when moving backward is about 70% of the running speed when moving forward. The slope of the left inclined portion 30a that contacts the cam roller 27 is reduced when the truck 1 moves forward, and the right inclined portion 30 that contacts the cam roller 27 when the truck 1 moves backward.
By increasing the slope of b and making the parallel portion 31a extending to the left inclined portion 30a slightly project toward the drive shaft 4 side than the parallel portion 31b extending to the right inclined portion 30b, a step 32 is provided and the shaft of the pin etc. It is pivotally supported by a piece 33.

That is, as mentioned above, there is a speed difference between forward and backward movement, so if the cam shape is made flat and flush at the center of the cam plate 28, a phenomenon occurs in which the forward movement is fast and the backward movement is slow or stops.

Therefore, by providing a step, the shaft 4 of the friction disk 12
By creating a difference in the amount of movement in the direction perpendicular to the axis of the parallel portion 31at, the parallel portion 31at
This allows the speeds of the carts at 31b to be the same.

That is, in FIG. 5, when moving forward, the cam plate 28 moves the point P2. The friction disk 12 is moved by the distance m1 between P21 in a direction perpendicular to the axis 4a of the shaft 4, so that the center 0 of the disk 12 substantially coincides with the axis 4a of the drive shaft 4.

At this time, the center 0 and the axis do not exactly match, and therefore, even at a predetermined stopping position of the bogie, when it is moving forward, it has a thrust in the forward direction and is stopped by a separate mechanical stopper.

Therefore, in order to keep the thrust constant during forward and backward movement, the parallel portions 31a and 21b are provided with a step.

In addition, when moving backward, the friction disk 12 moves by a distance m2 as shown in FIG. 5, so that the center 0 of the disk approximately coincides with the axis of the drive shaft 4, and it stops with a constant thrust. .

Further, an arm 26 provided with a cam roller 27 provided on the truck is supported so as to be swingable within a certain angle range in the direction of the traveling track of the truck.

That is, as shown in the third figure, the cam roller 27 is positioned at a point E on the truck side.
For example, a stop piece fixed to a part of the arm 26 and a stopper that engages with the stop piece are provided at two positions on the side surface of the support guide 8 so that the support guide 8 can swing freely only within the angle shown in the figure. If this is done, the arm 26 can swing freely only between the two stoppers.

The reason why the cam roller 27 is made swingable is as follows.

That is, if the cam roller 27 is fixed so that it cannot swing, the stop position of the truck will be determined by the stop positioning mechanism 53.
54 so that the position is the same in both forward and backward movement, so if the cam roller 27 is fixed, the third
If C in the figure is the final position, when moving forward, the cam roller 27 will stop when it reaches the position C, and there will be no problem, but when moving backward, the cam roller 27 will not be able to run over the step because of the step 32.
If D is the final position of the rollers, that is, the predetermined stopping position of the truck, there will be no problem when moving backward in the direction of arrow B, but since the final stage of forward movement in the direction of A will fall below the step, a shock will occur in the truck.

Therefore, by swinging the rollers 27, when the trolley stops at a predetermined position, the rollers 27 are used to stop when moving forward.
7 is in position C, and the roller 27 can take a certain position when stopping when moving backward, the above-mentioned disadvantages are prevented, and the thrust is kept constant.

Projecting pieces 34ay34b are projected from the ends of the left inclined portion 30a and the right inclined portion 30b, and a support 35 to which the projecting pieces 34a are rotatably attached with a snap ring or the like is attached to the cam frame 2.
A column 39 is fixed to a flange plate 37 screwed onto the cam frame 29 by bolts 40, and a link 38 connected to the protruding piece 34b by a pin or the like is rotatably attached by a snap ring or the like. A link 43 is connected by a pin to a protruding piece 42 that is fixed to a screwed flange plate 41 and protrudes from the parallel part 31a of the left inclined part 30a.
4 and a rod 46 at one end of the cylinder device 45 are rotatably connected by a pin, and a circular support 48 in which a cylinder 47 to which the link arm 44 is fixed is rotatably fitted is screwed onto the cam frame 29 by a bolt 49. The other end of the cylinder device 45 is rotatably supported by a bolt 52 on a pedestal 51 screwed onto the cam frame 29, and an L-shaped cylinder device 45 is fixed to the cylinder 47. The locking member 53 rotates around the circular support 48 in conjunction with the operation of the cylinder device 45, and engages with a stopper 54 vertically disposed on the lower surface of the truck 1 so as to be swingable in the direction of the truck traveling track 3. A stopper 55 is provided on the side wall of the flange plate 50 to prevent the above-mentioned cross-shaped locking member 53 from turning too much.

In the figure, reference numerals 56 and 57 are supply and discharge pipes for supplying and discharging fluid such as air for operating the cylinder device 45, and bolt holes 58, 59 and 60 of the flange plates 37, 41 and 50 are connected to the speed control cam plate 28. and the axis of the drive shaft 4, and the angle that the left inclined part 30a and the right inclined part 30b of the speed control cam plate 28 make with the axis of the drive shaft 4. Long holes are formed in orthogonal directions.

In the truck speed control device having the above configuration, the first
As shown by the two-dot chain line in the figure, when the side surface of the support guide 8 is in contact with the bracket 6b, the truck 1 is moving forward and backward, that is, in the normal running state. The device 45 is operated to cause the rod 46 to protrude as shown by the solid line in FIG.
8 in a direction close to the axis of the drive shaft 4, the cam roller 27 swings and comes into contact with the left inclined portion 30a, and the support guide 8 that indirectly supports the friction disk 12 is moved by the spring 24. By resisting the biasing force and moving in a direction approaching the axis of the drive shaft 4 according to the slope of the left inclined portion 30a, the roller 14 provided at the tip of the support arm 15 runs on the guide frame 19, as shown in FIG. By moving the friction disk 12 until the center of the friction disk 12 substantially coincides with the axis of the drive shaft 4 as shown by the solid line, the speed of the truck 1 is gradually reduced, and the truck is stopped by the stopper 54 at a predetermined position on the parallel portion 31a. That is, by rotating the L-shaped locking member 52 as shown by the solid line in FIGS. 1 and 3 in conjunction with the operation of the cylinder device 45, it can be engaged with the stopper 54 and the truck can be moved. 1 can be stopped at a predetermined position, and conversely, by operating the cylinder device 45, retracting the rod 46 as shown by the two-dot chain line in FIG. 3, and retracting the speed control cam plate 28, The cam roller 27 shown by C in FIG. 3 swings around E and smoothly rolls on the step 32 between the parallel parts 31a and 31b, and also rolls on the right inclined part 30b, and has an L-shaped locking member. 5
3 is released from the stopper 54, the truck 1 gradually accelerates according to the slope of the right slope portion 30b and travels forward.

In addition, in the same manner as when the bogie 1 traveling forward is decelerated to a stop, the cylinder device 45 is actuated to move the speed control cam plate 28 to the axis of the drive shaft 4 when the bogie is moving backward, that is, while traveling in the direction of arrow B. By moving the cam roller 27 in the approaching direction, the cam roller 27 swings and comes into contact with the right inclined portion 30b, and by moving the friction disk 12 until the center of the friction disk 12 substantially coincides with the axis of the drive shaft 4, the cam roller 27 swings and comes into contact with the right inclined portion 30b. The speed can be gradually reduced to a complete stop before the step 32 of the parallel portion 31aw31b, that is, the L-shaped locking member 53 is engaged with the stopper 54 as shown by the solid line in FIGS. 1 and 3. This makes it possible to match the stopping positions even when the truck moves forward and backward, and conversely, by operating the cylinder device 45 and retracting the speed control cam plate 28 from the cam roller 27, the cam roller shown as D in FIG. 27 swings around E and smoothly rolls over the step 32 between the parallel parts 31a and 31b, and also rolls the left inclined part 30a.By releasing the L-shaped locking member 53 from the stopper 54, the trolley 1 gradually accelerates according to the slope of the left slope portion 30a and travels backward.

As described above, according to the present invention, a speed control cam plate with a slope bent toward the outside of the running track at both ends is arranged along the running track of the bogie, and the slope of each slope is set at a different angle. Therefore, by moving this speed control cam plate in a direction perpendicular to the drive shaft, the friction disk is pressed against the drive shaft according to the bending slope of the speed control cam plate, whether the truck is moving forward or backward. The center of the friction disk of the traveling truck is gradually brought into alignment with the axis of the drive shaft, and the speed of the truck is reduced to dust, and after moving forward, the parallel parts 31a and 31b are moved in a constant deceleration state.
It can then be stopped at a predetermined position with a constant thrust.

In other words, when moving forward at a high speed, the bogie does not suddenly decelerate due to the gentle slope, and when moving backward at a relatively low speed, the steep slope allows the bogie to quickly decelerate to a stop. can.

[Brief explanation of the drawing]

The drawings show a speed control device according to the present invention, and FIGS. 1 and 2 are schematic diagrams of a truck, FIG. 3 is a plan view of the speed control device, FIG. 4 is a side view, and FIGS. Fig. 6 is an explanatory diagram showing the contact state between the friction disk and the drive shaft, and Fig. 5 is a plan view;
FIG. 6 is a side view when the drive shaft is stopped, and FIG. 7 is a side view when the drive shaft is rotating. 1...Bogie, 3...Track, 4...
... Drive shaft, 10 ... Rotation shaft, 12 ...
・Friction disk, 28...Speed control cam plate, 30a
...Left inclined part, 30b...Right inclined part,
31a, 31b...Parallel parts.

Claims (1)

[Scope of utility model registration request] A drive shaft is arranged along the running track of the truck, and a friction disk supported by the truck is attached to the drive shaft so as to be rotatable around a rotation axis that is slightly inclined with respect to a plane perpendicular to the axis of the drive shaft. A truck is provided that travels in pressure contact with the outer peripheral surface, and a speed-limiting cam plate that moves the friction disk in a direction perpendicular to the drive shaft is disposed along the running track of the truck, and the cam plate is connected to the drive shaft. has a parallel part parallel to the axis of the parallel part, and an inclined part continuing to both ends of the parallel part, each inclined part inclining to the outside of the running track at a different slope,
A speed control device for a truck, characterized in that the inclined portion controls the position of the friction disk in accordance with the traveling direction of the truck.