JPH0711010Y2 - Vehicle steering brake - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a steering brake suitable for installation on an existing road vehicle such as a freight truck and remodeling the vehicle into a snow vehicle. .

[Conventional technology]

It is generally known to use a steering brake as a turning device for a snow vehicle (for example, Japanese Utility Model Laid-Open No. 59-64369).
It brakes the wheels and tracks on the turning side and turns only by driving the wheels and tracks on the other side.

As a simple method for obtaining an inexpensive snowmobile, it has hitherto been practiced to replace the wheels of a lorry with crawler tracks. In snowy vehicles, so-called turning wheels that turn to the left or right by the steering wheel cannot be used when turning, so instead of using a turning brake for turning, a non-slip type is adopted as a differential mechanism for automobiles. Unless otherwise required, a clutch is required to connect and disconnect the power.

[Problems to be solved by the device]

However, if a brake and a clutch are respectively provided on the separate drive shafts that drive the left and right crawler belts, the structure around the drive shaft becomes large, not only the weight of the vehicle becomes excessive, but also the manufacturing cost rises significantly and It causes problems such as being unable to be used. Further, when the device becomes large, there is a problem that it becomes difficult to secure a space for mounting the device.

[Means for Solving the Problems]

The purpose of this invention is to eliminate the above-mentioned problems and to provide a lightweight steering brake by simplifying the structure for simultaneously braking the drive shaft and shutting off the power, and to obtain a lightweight steering brake. The steering brake 3 installed between
It is composed of a disconnecting clutch 7 and a multi-disc brake 8 which are coaxially arranged, an operating cylinder 9 is disposed between them, and a piston 9d of the operating cylinder 9 is provided with the disconnecting clutch 7 on one side and the multiple disc brake on the other side. It is characterized in that it can be engaged with 8 and this operating cylinder 9 is connected to the driving means 6 of the vehicle.

[Action]

The turning brake has a shut-off clutch 7 and a multi-plate brake 8 which are essential parts, and they are housed in a common case, and can be independently produced or transported. Further, since the steering brake is unitized in this way, an existing vehicle is equipped with a steering brake by interposing one each between the power unit 5 and the left and right drive wheels 5b. It can be converted into a specially equipped vehicle.

Further, a piston 9d housed in a hydraulic actuating cylinder 9 provided between the disconnecting clutch 7 and the multi-plate brake 8 moves to one side and moves to the disconnecting clutch 7, and to the other side to the multi-plate brake 8. Or stop the operation.

〔Example〕

The invention will be described below with reference to the illustrated embodiments. In the figure, reference numeral 1 denotes a snow vehicle, which is provided with running crawler tracks 2 and 2 on the left and right. The crawler track 2 includes a crawler member 2a, a drive wheel 2b and an idler wheel.
It is wound around 2c and is supported by the left and right wheel frames 2d. Each drive wheel 2b is connected to and driven by the power unit 5 by the left and right drive shafts 4 and 4 having a steering brake 3 interposed therebetween. The power unit 5 has a conventionally known structure including an engine 5a, a clutch 5b, a transmission 5c, and a final speed reducer 5d, and it is considered that no special explanation is necessary, and therefore the description thereof is omitted.

Reference numeral 6 denotes a driving means provided in the driver's seat of the vehicle, which includes, for example, a steering wheel 6a and a brake pedal 6b. Reference numeral 6c is a switching valve that switches between the oil passages 6d and 6e according to the operation of the steering handle 6a.

As shown in FIG. 2, the steering brake 3 is provided with one unit for each of the left and right drive shafts 4, 4. The drive shaft 4 is composed of three shaft portions including a drive shaft portion 4a, a driven shaft portion 4b and an output shaft portion 4c in the steering brake 3.
Further, it is supported by three clutch cases 3a, a brake case 3b, and an output case 3c, which are screwed to each other. That is, a normally-open cut-off clutch 7 for interrupting power when not operating is interposed between the drive shaft portion 4a and the driven shaft portion 4b forming the drive shaft 4, and the driven shaft portion 4b and the brake case.
A multi-disc brake 8 which is also a normally-open multi-disc clutch is interposed between 3b and 3b. Reference numeral 9 is a hydraulic actuating cylinder for engaging the disconnecting clutch 7 and the multi-plate brake 8, that is, for operating in a transmission state.

First, the cut-off clutch 7 is composed of a conventionally known multi-plate clutch, and includes a pressure receiving plate 7a splined to the drive shaft portion 4a, a pressing plate 7b that advances and retreats toward the pressure receiving plate 7a, and a large number of them interposed therebetween. It consists of a friction plate 7c. The friction plate 7c includes one that engages with the pressure receiving plate 7a and the other that engages with the shaft member 10 that is splined to the driven shaft portion 4b, and friction when the pressing plate 7b advances toward the pressure receiving plate 7a. It is in an engaged state in which it is engaged and transmits power, and when it leaves, it is in an engaged / disengaged state in which the spaces between them are cut off.

Similarly, the multi-disc brake 8 is also composed of a conventionally known multi-disc clutch, and is provided with a pressure receiving member 8b connected to the brake case 3b by a bolt 8a and a pressing member 8c that advances and retracts toward the pressure receiving member 8b, and is interposed between them. And a large number of friction plate members 8d. The friction plate member 8d engages with the pressure receiving member 8b, and the center member 8e splined to the driven shaft portion 4b.
When the pressing member 8c advances toward the pressure receiving member 8b, the braking state is established, and when the pressing member 8c is retracted, the releasing state is established.

The operating cylinder 9 is installed on the driven shaft portion 4b between the disconnecting clutch 7 and the multi-disc brake 8, and the pressure-resistant case 9a is disposed so as to face the pressing plate 7b and the pressing member 8c.
A cylinder chamber 9c is formed on the inner surface of 9b, and the inside of the cylinder chamber 9c is divided into two chambers on the left and right by a piston 9d. 9e,
Reference numeral 9f is a push rod slidably supported between the piston 9d and the pressure-resistant cases 9a and 9b, and a plurality of push rods 9f are arranged on the circumference of the piston 9d at equal intervals.

Thus, when hydraulic pressure acts in the cylinder chamber 9c through the oil passage 6c, the piston 9d moves to the left or right in the figure, and the push plate 9b is pushed through the push rod 9e, or the push rod 9f and the thrust bearing. The pressing member 8c is advanced toward the pressure receiving plate 7a or the pressure receiving member 8b via 11 to engage the cutoff clutch 7 or shift the multi-plate brake 8 to the braking state.

The output shaft portion 4c supported by the output case 3c is the driven shaft portion 4b.
Is output to the crawler belt 2 after being decelerated to an appropriate speed, and a reduction gear train 12 is interposed therebetween.

Next, the operation of this embodiment will be described. First, when the vehicle travels straight ahead, hydraulic pressure acts only on the disconnecting clutch 7 via the oil passage 6c, and the multi-plate brake 8 does not operate. The power of the power unit 5 is transmitted to the 2b via the drive shaft 4.

When the steering handle 6a is operated to the left or right, and if it is operated to the left, hydraulic pressure acts only on the left steering brake 3 in the cylinder chamber 9c on the right side of the piston 9d in FIG. The hydraulic pressure in the chamber 9c is cut off. Therefore, the disconnecting clutch 7 is disengaged, the multi-plate brake 8 operates, and the steering wheel 3 on the right side is maintained in the same manner as when going straight, so that the vehicle is driven only by the track 2 on the right side and the track 2 on the left side stops. Therefore, the left crawler belt 2 is centered and the vehicle is steered to the left.

When the brake pedal 6d is operated while the vehicle is traveling, pressure oil is simultaneously sent to the left and right steering brakes 3 through the oil passages 6c into the cylinder chambers 9c on both sides of the piston 9d, and the drive wheels are driven.
The drive shaft 4 connected to 2b is braked. Further, since the disconnecting clutch 7 maintains the transmission state, the deceleration of the power unit 5, that is, the engine braking also effectively acts.

[Effect of device]

As described above, according to the present invention, one unit is mounted between the power unit 5 and the left and right drive wheels 2b, 2b, and the power unit 5 is formed separately. The main part of can be used as it is. Further, since at least two vehicles are used for each vehicle, a large number of vehicles are used and mass production effect can be expected.

Further, the steered brake 3 has an operating cylinder 9 arranged between the disconnecting clutch 7 and the multiple disc brake 8, and the piston 9d
When the vehicle reciprocates, the cut-off clutch 7 and the multi-plate brake 8 arranged on both sides are antagonized to engage and disengage, so the number of main parts is reduced, the structure is simplified, and the steering This has the effect of making the outer shape of the brake 3 smaller.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention. FIG. 1 is a power system diagram, and FIG. 2 is an enlarged sectional view showing a main part thereof. 1 …… Snow car, 2 …… Crawler track 2a …… Crawler member, 2b …… Drive wheel 2c …… Idle wheel, 2d …… Left and right wheel frame 3 …… Steering brake, 3a …… Clutch case 3b …… Brake Case, 3c ...... Output case 4 ...... Left and right drive shafts, 4a ...... Drive shaft part 4b ...... Driven shaft part, 4c ...... Output shaft part 5 ...... Power unit, 5a ...... Engine 5b ...... Clutch, 5c ...... Transmission 5d ...... Final reducer, 6 ...... Driving means 6a ...... Steering wheel, 6b ...... Brake pedal 6c ...... Switching valve, 6d, 6e ...... Oil passage 7 ...... Disconnection clutch, 7a ...... Pressure receiving Plate 7b ... Pressing plate, 7c ... Multiple friction plates 8 ... Multi-plate brake, 8a ... Bolt 8b ... Pressure receiving member, 8c ... Pressing member 8d ... Friction plate member, 8e ... Center member 9 ... … Working cylinders, 9a, 9b …… Pressure resistant case 9c …… Cylinder chamber, 9d …… Pistons 9e, 9f …… Push rod, 10 …… Shaft member 11 …… Thrust shaft , 12 ...... reduction gear train

Claims (1)

[Scope of utility model registration request] 1. A steering brake 3 interposed between a power unit 5 and a drive wheel 5b is composed of a disconnecting clutch 7 and a multi-plate brake 8 which are coaxially arranged, and an operating cylinder therebetween. 9 is arranged so that the piston 9d of the working cylinder 9 can be engaged with the disconnect clutch 7 on one side and the multi-plate brake 8 on the other side, and the working cylinder 9 is connected to the driving means 6 of the vehicle. Steering brake for vehicles.