JPS6238427Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bumper for a front power take-off device, and is concerned with providing a bumper for a front power take-off device that has a simple structure and is intended to effectively protect the device.

2. Description of the Related Art Conventionally, traveling vehicles, such as agricultural tractors, have been provided with front power take-off devices for use in front-mounted working machines, mowers, and the like. When this tractor moves forward, accidents such as collision and interference between the front power take-off device and the stumps or large stones protruding from the surface of the road, resulting in damage to the casing of the device, have been observed. This caused major problems in terms of equipment maintenance and was also dangerous.

The present invention was devised in view of such conventional problems, and its characteristics are that, in a vehicle in which a front power take-off device is provided at the front of a running vehicle, the power take-off device described above is The case is provided with a protective member that protrudes forward from the case and is attached to the case so as to be movable back and forth via a connector, and an elastic member is interposed between the protective member and the connector in the traveling direction of the vehicle. Relative rearward movement of the protective member with respect to the case is restricted from elasticity, and the gap between the front surface of the case and the protective member in front of the front surface is larger than the thickness of the elastic member between the protective member and the connector, and The strength of the case is greater than the strength of the connector against external forces applied from the front of the protective member.

Embodiments of the present invention will be described below with reference to the drawings.

An agricultural tractor as an example of a traveling vehicle 1 has a vehicle body 2 consisting of an engine, a transmission case, etc.
A front axle case 4 is attached to a front axle frame 3 projecting forward from the vehicle body 2, and front wheels 5 are connected to both ends of the case 4.
Further, a rear wheel 6 is provided at the rear of the vehicle body 2.
A hydraulic system (not shown) is mounted on the upper surface of the rear part, and the hydraulic system is equipped with a lift arm that allows a ground work machine such as a rotary, which is towed at the rear part of the tractor, to be raised and lowered.

A front power extraction case 7 that protrudes downward is detachably attached to the front axle frame 3 via bolts 8, and an input shaft 9 that protrudes from the upper rear surface of the case 7.
is interlocked with the crankshaft of the engine via an electromagnetic clutch 10, etc., and the PTO shaft 11 protruding from the rear surface of the lower part of the case 7 is an output shaft that connects the transmission mechanism such as gears and chains contained in the case 7. It is interlocked and connected to the input shaft 9 via the input shaft 9. The case 7, input shaft 9, PTO shaft 11, etc. mainly constitute a front power take-off device.

The case 7 is provided with a protection member 13 that projects forward from the case 7 and is attached to the case 7 so as to be movable back and forth via a connector 12. An elastic member 14 is interposed therebetween to prevent the protective member 13 from moving backward relative to the case 7. That is, the protection member 13 is a rod member having a U-shaped plane with a rear opening, and in the illustrated example, it is made by bending a cylindrical body, and the cylindrical body 15 with the horizontal axis is fixed to both ends of the rod, and the cylindrical body 15 with the horizontal axis is fixed to the both ends of the rod member 13. A bolt as a tool 12 is loosely inserted into the cylindrical body 15 via a washer 16 and screwed onto the side surface of the case 7, and each cylindrical body 15 is sandwiched between the side surface of the case 7 and the washer 16. It is attached to the case 7 so that it can be moved back and forth. And cylindrical body 1
An annular rubber elastic member 14 is placed in the gap between the bolt and the bolt.
is interpolated.

In addition, the gap dimension L between the front surface of the case 7 and the protective member 13 in front of the front surface is
2, that is, in the illustrated example, the thickness dimension l of the elastic member 14 in the radial direction is larger than the thickness dimension l of the elastic member 14, and the external force P
On the other hand, the strength of the case 7 is made greater than the strength of the connector 12 .

A guide member 17 is removably provided on the side surface of the case 7 via a bolt 18, into which both opposite ends of the protection member 13 are slidably inserted in the axial direction.

The mower 22 includes a cutting blade body that is rotatable around a vertical shaft, and a mower frame 23 that pivotally supports the vertical shaft and covers the cutting blade body.
The main structure includes a limit gauge wheel 24 attached to the center of the front part of the mower frame 23, and gauge wheels 25 for mowing height adjustment attached to both sides of the rear part of the mower frame 23. The mower 22 is towed below the vehicle body 2 via a parallel link mechanism 26, and the parallel link mechanism 26 is provided with a pair of front links 27 and rear links 28 on the left and right. In the reaping posture of No. 22, both links 27 and 28 are configured to descend backwards.

The front link 27 has a turnbuckle 27a so that its length can be adjusted freely, and its front end is removably pivotally connected to a mounting bracket 29 protruding from both sides of the rear surface of the front power take-off case 7 by a connecting pin 30. The rear end of the mower frame 23 is removably pivotally connected to front brackets 31 provided on both sides of the front part of the mower frame 23 by a connecting pin 32. On the other hand, the front end of the rear link 28 is removably pivotally connected to a vehicle body bracket 33 mounted on both sides of the center portion of the vehicle body 2 by a connecting pin 34, while the rear end is attached to the mower frame 23.
It is pivotally connected by a connecting pin 36 to a rear bracket 35 projecting from the rear upper surface of the. In this case, the rear link 28 is provided with a large number of connecting holes 37 at predetermined intervals in the longitudinal direction, and by selecting any connecting hole 37 and inserting and supporting the connecting pins 34 and 36, the rear link 28 can be pivoted. The length between the knots can be freely changed and adjusted. In this case, both links 27,
A turnbuckle may be applied to 28 or one of the links, or a structure of a connecting hole 37 and a connecting pin may be applied.

In this state, the PTO shaft 11 and the vertical shaft for the cutting blade body are interlocked and connected by the universal joint shaft 38.

Bell cranks 39 are pivotally supported on both sides of the vehicle body 2. One end of the bell crank 39 is connected to the mower 22 via a lifting cable 40 such as a chain, and the other end is connected to a rod 41 and a lower part to which a working machine is attached. Link 4
The mower 22 is connected to the lift arm through a lift rod and the like, and is movable up and down by a hydraulic system as shown by the two-dot chain line in the figure. Further, a locking fitting 43 is provided on the vehicle body 2, and a locking pin 44 is provided on the mower machine frame 13, and the mower 22 is held in its highest position by the engagement of the locking fitting 43 and the locking pin 44.

According to the above embodiment configuration, the front/rear link 2
Since the lengths of 7 and 28 can be adjusted arbitrarily, it is possible to adjust the inclination of the mower 22 with respect to the ground surface, as well as adjust the length of the vehicle body 2.
Since the front and rear mounting positions of the mower 22 can be arbitrarily adopted, the wheel diameter and wheel base (2 wheels, 4 wheels,
The mower 22 can be appropriately mounted on various traveling vehicles 1 having different wheels (wheels), especially on various tractors.

According to the present invention, when the vehicle 1 is running, the protection member 13 collides with an obstacle such as a stump protruding from the ground surface before the front power take-off device, so that the device is protected. In addition, the elastic member 14 prevents interference between the protective member 13 and the case 7 and effectively absorbs the impact on the device. Furthermore, when an external force is applied, the connecting member 14 is first removed before the case 7 is damaged. 12 is damaged, and the operator of the traveling vehicle 1 can take measures such as stopping the vehicle between this initial impact and the breakage of the coupling 22, which is extremely beneficial in terms of protecting the front power take-off device. Coupled with the fact that the above effects can be achieved with a simple configuration, it is highly practical.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is an overall side view thereof, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a partial sectional view taken along the - line in Fig. 2, and Fig. 4 is a partial sectional view taken along the line -. The figure is the first
FIG. 3 is a partial plan view of the figure. DESCRIPTION OF SYMBOLS 1... Traveling vehicle, 7... Case, 12... Connector, 13... Protective member, 14... Elastic member.

Claims (1)

[Scope of utility model registration request] In a vehicle in which a front power take-off device is provided at the front of the vehicle, the case of the power take-off device includes:
A protective member is provided that protrudes forward from the case and is attached so as to be movable back and forth via a connector, and an elastic member is interposed between the protective member and the connector in the traveling direction of the vehicle, so that the protective member Relative backward movement with respect to the case is elastically restricted, the gap between the front of the case and the protective member in front of the front is larger than the thickness of the elastic member between the protective member and the connector, and the protective member is A bumper for a front power take-off device, characterized in that the strength of the case is greater than the strength of the connector against external forces received from the front.