JPH022691Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bogie drive device that causes the bogie to travel by pressing a friction disk provided at the bottom of the bogie against the outer peripheral surface of a drive shaft disposed along the running track of the bogie. Specifically, a friction disk is attached to the lower surface of the disk body formed at the tip of the rotating shaft that is slightly inclined with respect to the plane perpendicular to the axis of the drive shaft, at the bottom of the truck. This invention relates to a slip prevention device for a bogie drive device that moves a bogie while pressing against each other.

The propulsive force and running speed of the bogie during the bogie running described above vary depending on the center point of the friction disk and the position of the contact point of the drive shaft of the friction disk, and at this time, the relationship between the propulsive force and speed is correlated with each other. In theory,
The closer the line connecting the above two positions is at 90 degrees to the axis of the drive shaft, the greater the propulsive force of the bogie becomes, and conversely, the lower the running speed becomes.

That is, in the diagrams of the principle of propulsion shown in FIGS. 1 and 2, the line connecting the drive shaft contact point P of the friction disk 1 and the friction disk center point O forms an angle θ with the axis of the drive shaft 2. In this case, when a rotational torque T is applied to the drive shaft 2, a force F acts between the contact point P and the disk center point O, and a component of the force F is generated in the axial direction of the drive shaft 2. Fa will act, and the corresponding force will be
The Fa acts as a propulsive force, and the wheels 4 provided on the bogie 3 cause the bogie to travel on the track 5.

That is, F=T/sinθ... Fa=Fcosθ... Therefore, ,more Fa=Tcosθ/sinθ=T/tanθ.

Further, as shown in the second figure, when the cam roller r, which is interlocked with the rotatable friction disk 1 provided on the bogie 3 while the bogie is running, comes into contact with the braking cam K installed on the ground side, the gradient α of the braking cam K is reduced. The friction disk 1 moves toward the drive axis along
gradually decreases, and the propulsive force Fa increases.

Also, in the principle diagrams of running speed shown in Figures 3 and 4, if the driving shaft rotation speed is N and the drive shaft diameter is D under the same conditions as the propulsive force described above,
A speed V acts in a direction perpendicular to the line connecting the disk center point O and the contact point P, and a speed Va in the drive axis direction, which is a component force of the speed V, acts, and the truck 3 is moved by the wheels 4. As a result, the bogie will run on track 5.

That is, V=πDN/cosθ... Va=Vsinθ... Because it is, more Va=πDNsinθ/cosθ=πDNtanθ.

Further, when the cam roller r of the truck 3 comes into contact with the brake cam K as shown in the fourth figure, the friction disk 1 moves toward the drive axis along the slope α of the brake cam K, as described above, and the above relational expression is satisfied. As can be seen from the figure, as the friction disk 1 moves, the angle θ gradually decreases and the speed increases.
Va also gradually decreases.

In addition, the speed changes when the center point O of the friction disk coincides with the drive axis, that is, when the angle θ reaches zero degrees.
Va becomes zero and the vehicle stops running completely.

From the above, it is theoretically possible for the bogie to run within the range of the displacement angle θ from 0 degrees to 90 degrees, but in reality, the relationship between propulsive force and running speed and the driving source for bogie running are important. In view of the output of the drive motor, etc., the displacement angle θ is preferably from 0 degrees to about 45 degrees.

Therefore, when the displacement angle θ is approximately 45 degrees, which is the normal running state of the truck, the propulsive force is minimum, and conversely, the speed is maximum, so when the displacement angle θ is approximately 45 degrees, the friction disk 1 It is important to set the transmission capacity to the maximum.

However, in the above-mentioned bogie running, the drive shaft 2
Since the friction disk 1 makes surface contact with the contact surface and is propelled by the frictional force of the contact surface, there is no problem with normal driving, but if fluid such as oil adheres to the contact surface, an oil film may form between the contact surfaces. If oil or the like adheres to the contact surface and slip occurs, the transmission function will not be maximized, so it is preferable to take some measure to prevent slip.

In particular, if oil or the like is attached to the drive shaft 2 side, the oil on the drive shaft 2 will adhere to the friction disk 1 one after another as the trolley 3 moves, so the above-mentioned slip prevention measures are taken. is extremely important and indispensable in the above-mentioned trolley device.

Therefore, the present invention is based on the points mentioned above, and even if fluid such as oil adheres to the contact surface between the drive shaft and the friction disk, the adhered fluid is immediately expelled from the pressure contact surface to the cut groove. The pressure contact surface is always kept in a good condition with no fluid adhering to it, and the fluid that is expelled into the notched groove is immediately moved along the notched groove by the centrifugal force caused by the rotation of the friction disk. By being removed to the surrounding area, the transmission capacity is maximized without any slip phenomenon even under adverse conditions such as the oil on the drive shaft that adheres to the friction disk one after another as described above. The present invention provides a slip prevention device for a bogie drive device that is capable of preventing slips.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

In FIGS. 5 and 6, the truck 3 has wheels 4
The drive shaft 2 is supported on a track 5 via the track 5, and the drive shaft 2 is disposed along the track 5.

A frame 6 is fixed to the lower surface of the truck 3, and a rod 8 is fixed perpendicularly to the axis of the drive shaft 2 between side plates 7a and 7b of a bracket 7 which is fixedly suspended from the frame 6.

A support guide 9 is slidably and rotatably fitted into the rod 8, and a rotating shaft 11 is rotatably supported by a bearing (not shown) in a bearing housing 10 that is integrally fixed with the support guide 9. A disc body 12 formed at the lower end of the rotating shaft 11
A ring-shaped friction disk 1 is fixed to the lower surface of the rotary shaft 11, perpendicular to the axis of the rotating shaft 11.

The material of the friction disc 1 is preferably urethane rubber, neoprene rubber, synthetic rubber, etc., which are most excellent in terms of wear, elasticity transmission ability, etc.

Further, the axis of the rotating shaft 11 is inclined at a slight angle β with respect to a plane perpendicular to the axis of the drive shaft 2, that is, the friction disk 1 always contacts the outer peripheral surface of the drive shaft 2 at one point. The angle is set to β.

At this time, the contact surface 1a of the friction disk 1 is formed at approximately the same angle as the inclination angle β of the rotary shaft 11, that is, approximately parallel to the axis of the drive shaft 2, and the contact surface 1a of the friction disk 1 is formed so as to be approximately parallel to the axis of the drive shaft 2. A support block 13 is supported by a shaft 14, and a rotatable roller 15 is attached to the tip of the support block 13.
a support arm 16 having a support arm 16; and an adjustable plate 18 screwed onto a bracket 17 protruding from the front end of the bearing housing 10 in the direction of movement.
The contact surface 1a of the friction disk 1 is configured to press against the outer peripheral surface of the drive shaft 2 by a spring 19 biased therebetween.

Further, a spring 22 is biased between a fixing pin 20 protruding from the side of the bearing housing 10 and a fixing pin 21 protruding from the lower surface of the truck 3, so that the side surface of the support guide that indirectly supports the friction disk 1 is always supported. ,
The position of the friction disk 1 is regulated by coming into contact with the side plate 7b of the bracket 7. At this time, while the bogie 3 is running, a rotatable cam roller r provided at the tip of an L-shaped arm 23 protruding from the lower surface of the support guide 9 comes into contact with a braking cam K installed on the ground side and having a predetermined slope α. Then, the support guide 9 is guided by the rod 8 and moves relative to the spring 22 in a direction approaching the axis of the drive shaft 2, and as the support guide 9 moves, the frame is attached to the roller 15 of the support arm 16. 6 runs on a guide frame 24 fixed to the lower surface.

That is, the state in which the side surface of the support guide 9 is in contact with the side plate 7b of the bracket is the normal running state of the bogie 3, and while the bogie is running, the cam roller r comes into contact with the braking cam K, thereby causing a friction circle. The support guide 9 that indirectly supports the plate 1 moves toward the axis of the drive shaft 2 along the slope angle α of the brake cam K against the spring 22, and the friction disk 1 is placed on the axis of the drive shaft 2. When the centers of the two lines coincide with each other, that is, at the position indicated by the chain line, the vehicle stops running completely.

In addition, reference numeral 25 denotes an adjustment bolt screwed onto an adjustment block 26 protruding from the support guide 9.
To prevent the friction disk 1 from unnecessarily turning around the rod 8 at a joint, a cut, etc.

As described above, the bogie 3 runs on the track 5 via the wheels 4, and there is a drive shaft 2 that provides the driving force for the bogie running, and a friction disk that rotates and moves in contact with the drive shaft 2. If a fluid such as oil adheres to the contact surface 1a of the contact surface 1a, an oil film is formed on the contact surface and a slip phenomenon occurs, which may impede smooth running of the bogie.

Below, the contact surface 1 between the friction disk 1 and the drive shaft 2 is as follows.
A device for preventing the slip phenomenon that occurs in a.

That is, as shown in FIG. 7, a linear contact portion extending approximately in the radial direction of the friction disk is formed between the drive shaft and the friction disk, and the contact portion is pressed against the outer peripheral surface of the drive shaft 2 for rotation. A large number of linear cut grooves 1a that intersect each other are formed on the entire contact surface of the friction disk 1 in a base pattern, and the disk surface left in relief by the linear cut grooves 1a is In other words, the contact surfaces of the tops of a large number of small protrusions formed by the cut grooves 1a are formed with a large number of small flat surface irregularities. Further, the small plan view is formed at an angle such that the friction disk comes into close contact with the surface of the drive shaft when pressed against the drive shaft, and the cut groove is formed at least in a direction crossing the linear contact portion. A large number of them are formed, and a large number of concave and convex portions are lined up in the linear contact portion. and,
The fluid 35 adhering to the contact surface 2a of the friction disk 1 is immediately expelled to the cut groove 1a as the friction disk 1 is pressed against the pressure contact surface 2a, and no oil film is formed on the pressure contact surface 2a. Since each cut groove 1a is in a straight line, the fluid 35 expelled to the friction disk 1
Due to the centrifugal force, it is quickly removed to the periphery of the friction disk along the cut groove 1a. In addition, the contact surface 2a
Since the contact pressure per unit area of the material is increased, the transmission capacity is increased.

The cut groove 1a is formed on the friction disk 1 as shown in FIG.
The cut groove 1a is formed over the entire contact surface 36, and the cross-sectional shape, cut depth, etc. of the cut groove 1a are not particularly limited, and are appropriately set depending on the size of the drive shaft 2 and the friction disk. .

As described above, in the present invention, firstly, a large number of straight cut grooves that intersect with each other are formed on the entire contact surface of the friction disk that contacts the outer circumferential surface of the drive shaft, so that the fluid adhering to the contact surface is immediately absorbed into the contact surface. The contact surface is always kept in good condition with no fluid adhering to it.Secondly, the top of the small protrusion formed by the cut groove is a small flat surface. The top part reliably contacts the drive shaft surface with high contact pressure, and thirdly, the groove from which the fluid is expelled is a cut groove, and since the cut groove is straight, the displaced fluid is A slip phenomenon occurs in a cart of a type in which the friction disk is guided by the cut groove and promptly removed around the friction disk, and the friction disk presses against the drive shaft due to the synergistic effects of the first to third factors described above to transmit drive. The cart can be made to run smoothly without any problems.

In addition, since the linear contact area between the drive shaft and the friction disk is lined with many unevenness, the fluid that adheres to the drive shaft and is brought to the contact area is moved as quickly as possible. It is possible to maintain a good condition in which no fluid is present between the drive shaft surface and the small plane that is in close contact with the drive shaft.

[Brief explanation of drawings]

1 to 4 are explanatory diagrams of the propulsive force and running speed of the bogie drive device, and FIGS. 5 to 6 are front and side views showing one embodiment of the bogie drive device,
FIG. 7 is a partially enlarged view of the contact surface between the drive shaft and the friction disk, and FIG. 8 is an overall view of the friction disk. DESCRIPTION OF SYMBOLS 1... Friction disk, 1a... Cut groove, 2... Drive shaft, 2a... Contact surface, 5... Raceway, 11... Rotating shaft, 36... Friction disk surface.

Claims (1)

[Scope of utility model registration request] A drive shaft is disposed along the running track of the truck, and a friction disk is provided rotatably supported around a rotation axis that is slightly inclined with respect to a plane perpendicular to the axis of the drive shaft. A plate is pressed against the drive shaft to form a linear contact portion between the drive shaft and the friction disk that extends approximately in the radial direction of the friction disk, and also drives the friction disk of the traveling bogie drive device. By forming a large number of linear cut grooves that intersect with each other in a checkerboard pattern on the entire surface of the shaft contact surface, a large number of unevenness is formed with the contact surface at the top as a small plane, and the small plane is a friction circle. When the plate is pressed against the drive shaft, the cut grooves are formed at an angle so as to come into close contact with the surface of the drive shaft, and the cut grooves are formed in large numbers at least in a direction that crosses the linear contact portion. 1. A slip prevention device for a bogie drive device, characterized in that a contact portion has a large number of concavities and convexities lined up.