JPH042464B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a single track transport device that improves the efficiency of braking force for a towing vehicle.

[Prior Art] A single-track transport device used for transporting cargo, etc. is a self-propelled type that has a drive wheel with a pinion wheel or pin protrusion along a single track with locking teeth such as racks and pin holes. The vehicle is configured to tow a cargo truck or to drive a self-propelled vehicle equipped with a cargo platform to the towing vehicle. In particular, when the single track transport device is used for cargo handling on steep slopes, the cargo handling becomes easy. Steep slopes are used, for example, to connect orchards of mandarin oranges and other fruits cultivated in mountainous areas with transportation and work bases at the foot of the mountain. In this case, the transport vehicle is
They go up and down slopes along the track to unload crops, unload work materials from bases, etc. In such a single track transport device, sufficient engine power is transmitted to the drive wheels when traveling at a relatively low speed uphill due to the engagement between the drive wheels of the tow vehicle and the locking teeth of the single track. . However, when traveling downhill with luggage loaded, gravitational acceleration is applied. Therefore, if any failure occurs in the braking mechanism, there is a risk that the towing vehicle, cart, etc. will start to run out of control. Therefore, the towing vehicle has a handbrake used for normal braking operations, and a power transmission system that exists between the engine output shaft and the drive wheel shaft to prevent dangerous speeds when driving downhill. It has a built-in centrifugal brake. In addition, to prevent the downhill speed from becoming abnormally high, a constant speed brake such as a so-called centrifugal brake, which expands the brake shoe due to centrifugal force, is incorporated. Furthermore, in order to further improve safety, in addition to the two brakes mentioned above, some towing vehicles are equipped with emergency brakes on the driving wheels that operate when the driving wheels rotate abnormally.

[Problem to be solved by the invention]

However, when driving downhill with a load that exceeds the maximum allowable load capacity, a towing vehicle equipped with a handbrake and constant speed brake but not equipped with an emergency brake that acts directly on the drive wheels may If the tow vehicle is overloaded and travels downhill, the tow vehicle may descend at a speed that exceeds the braking capacity of the tow vehicle, which is extremely dangerous. Therefore, the present invention is suitable for towing vehicles that are not equipped with a braking mechanism as a safety measure, or are equipped with one but have a small braking capacity, and furthermore, when the length of the single track is extended and the environment of the extended part has many ups and downs. The purpose of the present invention is to provide a single track transport device that can easily and easily increase the braking capacity in any situation, such as when the braking capacity must be increased when traveling on steep terrain. .

[Means to solve the problem]

In order to achieve the object, the present invention provides a towing vehicle having a single track having locking teeth such as a rack, a drive wheel that is driven by engaging with the locking teeth of the single track, and A single-track transportation device having a connected loading truck and a brake vehicle connected to the towing vehicle or the loading truck and incorporating a braking mechanism that operates at a predetermined speed or higher, wherein the braking mechanism is connected to the brake vehicle. A rotary plate fitted to the axle, a side plate fixed to the vehicle body of the brake vehicle, a locking pin protruding from the side plate outside the rotation area of the rotary plate, and a contracting force of a spring to prevent the brake vehicle from rotating during normal driving. a locking pawl that is attached to the rotary plate so as to be housed within a plane of the rotary plate, and is locked to the locking pin by centrifugal force generated when the rotary plate rotates at a set speed or higher; A brake shoe is provided near the periphery of the rotary plate and is coaxially connected to the brake arm, and a brake drum is fixed to the axle and the brake shoe is in contact with an inner circumferential surface, and the rotary plate is set. When the vehicle rotates at a speed higher than that, the locking pawl that pops out against the contraction force of the spring is locked with the locking pin, thereby applying a braking force to the brake wheel.

【Example】

Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings. In this embodiment, as shown in FIG. 1, a system is adopted in which cargo is transported by a cart 20 connected to a towing vehicle 10. Both the tow vehicle 10 and the cart 20 are capable of traveling along a single track 30. The towing vehicle 10 has an engine 12 mounted on a vehicle body 11 as a power source. The output of the engine 12 is transmitted to drive wheels 14 via a transmission 13 and a chain. Drive teeth 15 that mesh with racks 31 of single track 30 are formed on the drive wheel 14 at equal pitches on the circumferential surface. The driving wheel 14 is connected to the single track 3 along with the idler wheel 16.
Located below 0. On the other hand, the idler wheels 17 and 18 that come into contact with the flat part 32 (see FIG. 3) of the single track 30
is provided on the vehicle body 11. And single track 3
0 is the driving wheel 14, the idler wheel 16, and the idler wheel 17,1
8, and by the engagement between the drive teeth 15 and the rack 31, the towing vehicle 10 is moved onto the single track 3.
Driving along 0. A loading truck 20 having a loading platform 21 of an appropriate size is connected to the towing vehicle 10. The truck 20 has two sets of clamping wheels 2 that clamp the single track 30 from above and below.
It has 2, 23, 24, 25. The tow vehicle 10 itself has an appropriate braking mechanism (not shown) built into the power transmission system from the engine 12 to the drive wheels 14. By manually operating this braking mechanism, the towing vehicle 10 is braked or driven at a constant speed. However, when the tow vehicle 10 is driven under conditions that exceed the braking capacity of the braking mechanism built into the tow vehicle 10, or when used on a steep uphill road that far exceeds the environment considered in the design, The cart 20 and the tow vehicle 10 loaded with the vehicle have a high risk of running out of control, especially when traveling downhill. In order to avoid this runaway, the braking vehicle 40 is
By connecting to 0, the braking ability is enhanced. The vehicle body 41 of the braking vehicle 40 has a single track 3 from the information.
Idler wheels 42 and 43 that are in contact with zero are provided.
The idler wheel 42 forms a pair with the lower idler wheel 44 to sandwich the single track 30 from above and below. A locking ring 45 paired with the other idler wheel 43 engages with the rack 31 or pin hole of the single track 30. A braking mechanism 50 that applies a brake to the rotation of the locking ring 45 when the locking ring 45 approaches a runaway state.
is provided. As shown in FIG. 2, the brake mechanism 50 includes a side plate 51 fixed to the vehicle body 41 of the brake wheel 40 and a rotary plate 61 fitted to the axle 46 of the brake wheel 40. A locking pin 52 is provided on the side plate 51 so as to protrude from the outer periphery of the rotation area of the rotary plate 61 . On the other hand, two locking claws 62 and 63 are pivotally supported on the rotary plate 61, and are protruded outward by centrifugal force. The locking claws 62 and 63 are in a steady state when the stopper 6
5, it is pulled toward the center of the rotating plate 61 by the spring 64. And the rotating plate 61
Depending on the direction of rotation, either one of the locking claws 62 and 63 can protrude outward. A brake arm 70 is installed near the periphery of the rotating plate 61.
A pivot 71 provided at the base of the is penetrated. The free end 72 of the brake arm 70 is urged toward the outside of the rotary plate 61 by the elastic force of the push spring 73. Further, a load is applied from the brake shoe 81 from the opposite direction to the push spring 73, so that the brake arm 70 is held stationary. As shown in FIG. 3, a brake drum 80 is further fixed to the axle 46 of the brake vehicle 40, and a brake shoe 81 is disposed inside the brake drum 80. A base 82 of the brake shoe 81 is fixed to a pivot 71 of the brake arm 70.
The outer portion 83 of the brake shoe 81 is pressed against the inner peripheral surface of the brake drum 80. Next, the operation of the braking mechanism 50 incorporated in the axle 46 of the locking ring 45 will be explained. First, a towing vehicle 10, a cart 20, and a brake vehicle 40
When the vehicle is traveling along the single track 30 at a safe speed, the rotating plate 61 rotates together with the axle 46. At this time, the brake drum 80, the brake shoe 8
1 is also rotating, and no braking force is applied to the rotation of the axle 46. When the brake wheel 50 approaches a state in which it is running at a speed exceeding the safe speed, such as when the axle 46 rotates at an abnormally high speed, either one of the locking pawls 62 and 63 of the rotary plate 61 is activated due to the elasticity of the spring 64. It resists and spreads outward due to centrifugal force. The expanded locking pawl 62 hits the locking pin 52 of the side plate 51, as shown in FIG. the result,
The rotation of the rotating plate 61 is prevented by the engagement between the locking pin 52 and the locking pawl 62. When the movement of the rotating plate 61 in the rotational direction is restricted,
The brake shoe 81 fixed to the rotating plate 61 by the pivot 71 is prevented from rotating together with the axle 46. Then, only the brake drum 80 rotates together with the axle 46. Therefore, the brake drum 80 is subjected to braking by the brake shoe 81. This braking force suppresses abnormal speed when traveling downhill.
Then, the braking force generated in the braking vehicle 40 causes the towing vehicle 1 to
0 and the cart 20 are maintained at appropriate speeds.

【Effect of the invention】

As explained above, in the single track transportation device of the present invention, a brake vehicle equipped with a brake mechanism that operates at a predetermined speed or higher is connected to the tow vehicle and the cart. By installing this brake vehicle, the braking ability can be enhanced, and abnormal running, which occurs when a towing vehicle, a cart, etc., descends a steep slope is prevented. Furthermore, since the addition of a brake vehicle is easy, it is possible to optionally add a brake vehicle to an existing single track vehicle.

[Brief explanation of drawings]

Fig. 1 is an overall side view of a towing vehicle, a cart, and a braking vehicle connected together in an embodiment of the present invention, Fig. 2 is a front view of a braking mechanism equipped on the braking vehicle, and Fig. 3 is along the line shown in Fig. 2. A sectional view, FIG. 4 is a sectional view of the brake in an operating state. 10: Towing vehicle, 20: Cart, 30: Single track,
31: Rack, 40: Braking vehicle, 41: Vehicle body, 4
6: Axle, 50: Braking mechanism, 51: Side plate, 52:
Locking pin, 61: rotating plate, 62, 63: locking claw,
64: Spring, 70: Brake arm, 80: Brake drum, 81: Brake shoe.

Claims (1)

[Scope of Claims] 1. A single track having locking teeth such as a rack, a towing vehicle having a drive wheel that is driven by engaging with the locking teeth of the single track, and a cargo platform connected to the towing vehicle. A single track transportation device comprising a vehicle and a brake vehicle connected to the towing vehicle or the cart and incorporating a brake mechanism that operates at a predetermined speed or higher, wherein the brake mechanism is fitted onto an axle of the brake vehicle. a side plate fixed to the body of the braking vehicle; a locking pin protruding from the side plate outside the rotation area of the rotary plate; a locking pawl that is attached to the rotating plate so as to be housed in the rotating plate and that is locked to the locking pin by centrifugal force generated when the rotating plate rotates at a set speed or higher; A brake shoe is provided near the periphery and is pivotally mounted coaxially with a brake arm, and a brake drum is fixed to the axle and the brake shoe is in contact with an inner circumferential surface, and the rotary plate rotates at a set speed or higher. In the single track transportation device, the locking pawl that pops out against the contraction force of the spring is locked with the locking pin and applies a braking force to the brake wheel.