JPH07237463A - Self-traveling mowing machine - Google Patents

Abstract

PURPOSE:To provide a self-traveling mowing machine, which stops running of a machine body when a foot pedal is stepped down during running simultaneously with automatically turning back a running lever to a neutral position. CONSTITUTION:In a self-traveling mowing machine arranging a mowing blade 2 in a lower part of a machine body 1, a running lever 5, by which a machine body driving gear (a) is actuated to advance the machine body 1 by a front tilt and to reverse the machine body 1 by a rear tilt, is provided in a managing part 4 operable in a driver's stand 3. A foot pedal 6, stopping running the machine body 1 by actuating a brake mechanism (b) of the machine body driving gear (b) through a stepping operation, is provided, and further a drive release mechanism 7, resetting the running lever 5 to a neutral position when stepped the foot pedal 6, is provided, in the machine body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled mower in which when a brake petal is stepped on while traveling, the traveling lever automatically returns to a neutral position and the traveling of the machine is stopped.

[0002]

2. Description of the Related Art A traveling lever of a conventional self-propelled mower is provided with a notch on a lower end shaft portion of the traveling lever or friction on the shaft portion in order to secure a traveling position of the lever. A mechanism was provided to fix the position of the lever. Therefore, when stopping the aircraft during traveling, there is a troublesome drawback that it requires a two-action operation of manually depressing the brake petal and then manually returning the position of the traveling lever to the neutral position.

According to the present invention, a self-propelled type which solves the above-mentioned drawbacks is provided by providing a drive release mechanism capable of automatically returning the traveling lever to the neutral position and stopping the traveling of the body when the brake petal is stepped on during traveling. It provides a mower.

[0004]

The gist of the present invention will be described with reference to the accompanying drawings.

A self-propelled mower in which a grass cutting blade 2 is arranged at a lower portion of a machine body 1, and a machine body drive device a is actuated by tilting forward to a control section 4 which can be operated by a cab 3. Providing a traveling lever 5 for operating the machine body drive device a by moving it backward and tilting it backward, and providing a foot pedal 6 for stopping the traveling of the machine body 1 by operating the brake mechanism b of the machine body drive device a by stepping operation, Further, the present invention relates to a self-propelled mower, characterized in that a drive release mechanism 7 for returning the traveling lever 5 to a neutral position when the foot pedal 6 is stepped on is provided in the machine body 1.

[0006]

Operation: The traveling lever 5 is tilted forward / backward to operate the machine body drive device a to move the machine body 1 forward / backward to travel.

When the foot pedal 6 is stepped on, the brake mechanism b of the machine body drive device a is operated to stop the traveling of the machine body 1, and at the same time, the drive release mechanism 7 provided in the machine body 1 causes the traveling lever 5 to be in the neutral position. Return to position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show a preferred embodiment of the present invention, in which an engine 9 is mounted on the rear portion of the machine body 1, and the power of the engine 9 is separated and driven on the lower side of the central portion of the machine body 1. A self-propelled mower equipped with a rotary mower 2 is shown.

A floor plate 11 is stretched on the upper surface of the machine base 10.
A driver's seat 12 is provided above the driver's seat 12, and a floor pedal 11 in front of the driver's seat 12 is provided with a foot pedal 6 that is operated by a brake mechanism b of a machine body drive device a to stop the traveling of the machine body 1.

A structure for stopping the traveling of the machine body 1 by operating the brake mechanism b of the machine body drive device a by operating the foot pedal 6 will be described.

The illustrated foot pedal 6 is provided with brackets 13 and 13 on the left and right sides of the lower surface of the floor plate 11 at predetermined intervals, and a support shaft 14 is installed between the left and right brackets 13 and 13.
The shaft portion 6 ₁ of the foot pedal 6 is attached to the shaft 14, the brake petal 6 ₂ is erected near the right end of the shaft portion 6 ₁ , and the tip thereof is attached to the floor board 1
1, the lever 6 ₃ is welded to approximately the center of the shaft 6 ₁ and the tip thereof is projected obliquely rearward and upward.

Brackets 15, 15 for brake links are vertically installed at predetermined intervals on the left and right of the bottom surface of the floor plate 11 behind the brackets 13, 13, and a shaft 16 is installed between the left and right brackets 15, 15. , The shaft 17 ₁ of the brake link 17 is attached to the shaft 16, and the link lever 17 is attached to the center of the shaft 17 _1.
2 is projected obliquely forward and downward, and the tip of the link lever 17 ₂ and the lever 6 ₃ of the foot pedal 6 are connected to the U-shaped link rod 18
The link lever 17 ₃ is welded near the right end of the shaft portion 17 ₁ , and its tip is provided obliquely rearward and downward.

Brackets 19 and 19 are provided on the left and right sides of the rear of the machine base 10 at predetermined intervals, and the left and right brackets 19 and 19 are provided.
A brake shaft 20 is installed in between, and the shaft portion 21 ₁ of the arm body 21 is fixedly attached to this brake shaft 20, and an arm 21 ₂ is projected obliquely rearward and upward from this shaft portion 21 ₁ and the protruding end thereof is provided. The brake rod 23 is extended forward through the back spring 22, and a bifurcated joint is provided at the extended end to provide the link lever 17
Connect the shaft to the tip of ₃ .

In the figure, reference numeral 24 is a turnbuckle which divides the brake rod 23 into front and rear parts to adjust the length of the tip shaft attachment portion between the link lever 17 ₃ and the arm 21 ₂ , and 25 is a left and right arm body 21. It is a collar that can be positioned between brackets 19 and 19.

The left end of the brake shaft 20 is extended toward the center of the machine body 1, a brake lever 26 is welded to this extended end, and its tip is projected obliquely rearward and downward so that the projected end portion is formed.
A link 27 connects the tip of the HST brake arm b ′ of the brake mechanism b of the machine body drive device a with a link 27.

A structure for operating the machine body drive device a by the forward tilt of the traveling lever 5 to move the machine body 1 forward and operating the machine body drive device a by the backward tilt to move the machine body 1 backward will be described.

Bearings 8, 8 are provided on the right and left sides of the machine base 10 on the right side of the driver's seat 12, and a lever shaft 29 for the traveling lever 5 is pivotally mounted between the left and right bearings 8, 8.
The shaft 5 ₁ of the traveling lever 5 is fastened to the shaft 5 ₁ , the rod 5 ₂ provided with the grip portion at the tip is erected on the shaft 5 _1, and the lever 5 is attached to the shaft 5 ₁ close to the rod 5 _{2. 3} is provided, and its tip is projected obliquely rearward and upward.

The erected the right side in the traveling linking shaft 30 of the machine body 1 rearward machine base 10, and pivotally attached to the shaft portion 31 ₁ of the driving link 31 to the travel link for shaft 30, the shaft portion 31 ₁ A link lever 31 ₂ is provided, and its tip is projected rightward. This protruding end and the lever 5
The tip of ₃ is connected by a traveling rod 32 via shaft attachment joints 32 ₁ , 32 ₁ each having a female screw whose screwing length can be adjusted, and a lever 31 ₃ is provided on a shaft 31 ₁ of a traveling link 31. The tip is projected rearward.

HST projecting rearward from the airframe drive device a
The projecting portion of the arm a ′ and the projecting end portion of the lever 31 ₃ are provided on both ends with a coupling tool 33 having bifurcated joints 33 ₁ , 33 ₁ whose length can be adjusted by a screw mechanism, Locking pieces 34, 34 are erected on the left and right sides of the machine base 10 at the rear of the machine body 1, and adjusting screw rods 35 are screwed to the respective locking pieces 34, and a tension balance spring 36 is provided at the tip thereof, and the adjusting screw rods are provided. The screwing lengths of 35 and 35 are adjusted to connect the tip of the tension balance spring 36 to the tip of the HST traveling arm a ′ so that the HST traveling arm a ′ is normally located at the neutral position. .

[0020] Since the structure allowed to operate the machine body drive a by front and rear slope of the travel lever 5 of the present embodiment constructed as described above, when the rod 5 ₂ travel levers 5 allowed to anteversion,
Because the forward tilt angle in proportion to the lever 5 ₃ rotates counterclockwise bearing portions 8, 8 as the axial center, the travel link 31 through the driving rod 32 is counter-traveling linking shaft 30 as an axis rotates clockwise, the front body 1 so allowed to operate the machine body driving device a of the HST in the forward direction to rotate the HST traveling arm a 'in the counterclockwise direction by引動the connector 33 of the rod 5 ₂ tilt Move forward at a speed proportional to the angle.

When the rod 5 ₂ of the traveling lever 5 is tilted backward,
Contrary to the above, the lever 5 ₃ rotates clockwise, the HST arm a ′ is pushed by the connector 33 and rotates clockwise, and the HST body drive device a is operated in the backward direction. 1 backward at a speed proportional to the reclining angle of the rod 5 _2.

The drive release mechanism 7 for returning the traveling lever 5 to the neutral position when the foot pedal 6 is stepped on will be described.

A friction pulley 38 having a V-shaped V-shaped groove at the center is fixed to the end of the lever shaft 29 for the traveling lever 5 on the side of the driver's seat 12.

A bracket is hung from the floor plate 11 in front of the friction pulley 38, a bearing pin 39 is laterally provided on the bracket, and a shaft portion 40 ₁ of a friction body 40 is axially attached to the bearing pin 39. An arm 40 ₂ is projected rearward from the portion 40 ₁ , locking plates 41 are fixed to the projecting ends, both ends thereof are bent slightly upward, and the V-shaped groove of the friction pulley 38 is formed on the locking plate 41. In the normal state, a friction piece 42 having a V-belt-shaped cross section, which normally abuts in a secant shape, is fixed to the side surface.

A link 40 ₃ is projecting obliquely downward and forward from the shaft 40 ₁ of the friction body 40, and the shaft 43 ₁ of the connecting body 43 is loosely inserted into the brake rod 23 behind the turnbuckle 24. Part 43 ₁
A connecting piece 43 ₂ is projectingly provided rearward in an L shape, and the connecting piece 43 ₂
A bifurcated joint is attached to the tip of the link 403 to attach the connecting shaft to the tip of the link 40 ₃ .

Reference numerals 44 and 44 are adjusting nuts, which are screwed to the brake rod 23 so as to sandwich the connecting body 43 from both sides before and after the connecting body 43 inserted into the brake rod 23. Connected to the brake rod 23 by screwing
3 is set on the brake rod 23, and the relative position between the friction pulley 38 and the friction piece 42 is adjusted by the connecting piece 43 ₂ and the link 40 ₃ .

A locking piece 40 ₄ is projectingly provided above the shaft 40 ₁ of the friction body 40, a back spring 45 is attached to this projecting end, and the tension of the back spring 45 is screwed to the tip of the back spring 45. An adjusting tool 46 for adjusting the friction pulley 38 is attached by the tension of the back spring 45 so that the friction piece 42 presses and abuts the side surface of the V-shaped groove portion of the friction pulley 38 in a secant-like manner to rotate the friction pulley 38 by the friction force. Is provided so as to be locked.

Since the embodiment of the present invention is configured as described above, in the traveling lever 5, the friction piece 42 is pressed against the friction pulley 38 by the tension of the back spring 45, and the friction force between the friction piece 42 and the friction pulley 38 is generated. Since the rotation is locked, the friction lever and the tension force of the tension balance spring 36 on the left side are overcome, and the traveling lever 5 is tilted forward so that the desired speed of the body 1 is reached, and the hand is released. When the travel lever 5 is locked by a frictional force at that location, at a rate wherein the HST traveling arm a 'as proportional to operate the aircraft drive a of the HST in the forward direction to the inclination angle of the rod 5 ₂ When the machine body 1 moves forward, and the traveling lever 5 overcomes the frictional force and the tension force of the tension balance spring 36 on the right side to tilt backward, the HST traveling arm a'actuates in the reverse direction and the machine body 1 moves. Go backwards.

Stepping petals 6 when the vehicle 1 travels in the forward or reverse direction
When踏動the brake link 17 by a link lever 18 the lever 6 ₃ rotates counterclockwise the shaft 14 as an axis is rotated clockwise as the axis of the shaft 16, the arm member 21 by the brake rod 23 , The brake shaft 20 and the brake lever 26 rotate counterclockwise around the shaft mounting holes of the brackets 19, 19 as a link, and the tip of the brake arm b ′ is moved clockwise by the link 27 to stop the traveling of the machine body 1. Excuse me.

At the same time, the brake pedal 23 moves forward of the vehicle body 1 by the stepping of the foot pedal 6, and the connecting body 43 locked in the middle of the brake rod 23 moves forward together with the brake rod 23. friction piece 42 rotates clockwise bought out the tensile force of the back spring 45 the friction body 40 by the connecting piece 43 ₂ is an axis of the bearing pin 39 is separated from the V-shaped groove of the friction pulley 38, the travel lever 5 The frictional force that locks the rotation is released.

When the frictional force is released, the tension forces of the left and right tension balance springs 36, 36 provided at the tip of the HST traveling arm a'become in balance, and the HST traveling arm a'is set to the neutral position. Simultaneously with the return, the driving force of the machine body 1 by the machine body drive device a becomes neutral, and the traveling lever 5 returns to the neutral position.

When the foot is released from the pedal pedal 6 in this state, the friction body 40 is rotated counterclockwise about the bearing bin 39 by the urging force of the back spring 45, and the friction piece 42 is moved to the V groove portion of the friction pulley 38. Is pressed against and the rotation of the traveling lever 5 is locked in a neutral state.

Incidentally, reference numeral 48 is a parking brake, and after the foot pedal 6 is stepped on and the brake mechanism b is actuated, the standing tip of the parking brake 48 is tilted forward.
The key-type lower portion 48 ₁ of 48 is rotated counterclockwise fulcrum 49 as an axis caught by the front transverse rod of said U-shaped link lever 18, before the key-shaped lower portion 48 ₁ and the link lever 18 Since the abutting part with the side bar is a fulcrum beyond the fulcrum 49 of the parking brake 48,
The key-shaped lower end portion 48 ₁ of the parking brake 48 continues to be locked with the link body 18, the foot pedal 6 maintains its stepped position, and the brake mechanism b maintains the brake ON state to operate the parking brake. continue. When the parking brake 48 returns to the original, the key-type lower portion 48 ₁ is away from the link rod 18, foot petal 6 is restored to the original state by the compression force of the back spring 22.

[0034]

As described above, the present invention is a self-propelled mower in which a grass cutting blade is arranged in the lower part of the machine body, and the machine body drive device is actuated by tilting forward on the control section which can be operated by the cab. Providing a travel lever that moves the machine forward and activates the machine drive device by tilting backwards, and a foot pedal that operates the brake mechanism of the machine drive device to stop traveling of the machine by stepping operation. Since the aircraft has a drive release mechanism that returns the traveling lever to the neutral position when the petal is stepped on, the traveling lever is tilted and held at the desired aircraft speed to allow the aircraft to travel. When you step on the petal, the drive release mechanism automatically returns the travel lever to the neutral position as soon as the aircraft stops traveling. , An easy practical soo a self-propelled mowing machine structure simple operation that does not require the operation of the two actions to return the position of the travel lever to neutral manually.

[Brief description of drawings]

FIG. 1 is a side view for explaining an essential part showing a configuration of an embodiment.

FIG. 2 is a side view showing a state where the foot pedal is stepped on and the friction piece of the drive release mechanism is separated from the friction pulley of the traveling lever.

FIG. 3 is a plan view of a main part of the embodiment.

[Explanation of symbols]

 a Airframe drive device b Brake mechanism 1 Airframe 2 Mowing blade 3 Driver's cab 4 Control part 5 Travel lever 6 Foot pedal 7 Drive release mechanism

Claims (1)

[Claims] 1. A self-propelled mower in which a grass cutting blade is arranged at a lower portion of a machine body, wherein a control section operable by a driver's cab operates a machine body drive device by forward tilting to move the machine body forward and tilt backward. A travel lever that operates the machine drive device to move backward is provided, and a foot pedal that operates the brake mechanism of the machine drive device to stop traveling of the machine by stepping operation is provided, and the travel lever is used when the foot petal is stepped on. A self-propelled mower characterized in that a drive release mechanism for returning the to the neutral position is provided on the machine body.