JPS6240826Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch pedal device for an agricultural tractor.

In general, a clutch pedal device is often equipped with a lower limit stopper mechanism to prevent excessive stretching of the wire or damage to the clutch pedal device due to excessive depression of the clutch pedal.

However, in the conventional lower limit stopper mechanism, as in the clutch pedal disclosed in Japanese Utility Model Application Publication No. 55-107630, a special lower limit stopper member is provided on the clutch pedal, and a mating member with which the lower limit stopper member abuts is provided. is specially installed in the transmission case via a flange. Therefore, the number of parts increases, which is disadvantageous in terms of cost.

The purpose of the present invention is to save parts for the lower limit stopper and parts for supporting the clutch pedal by devising the bottom wall of the body frame, thereby reducing costs and making the tractor more compact. In order to achieve the above object, the present invention forms a body frame disposed on the side of a tractor into an L-shaped cross section with a generally horizontal bottom wall and a side wall extending upward from the outer end of the bottom wall. A support cylinder is fixed to the upper surface of the bottom wall of the fuselage frame, and the base end of the clutch pedal on the rotation center side is extended further inward from the tractor than the side wall and rotatably supported by the support cylinder, and the base end of the clutch pedal is supported rotatably on the support cylinder. A wire bracket is fixed to the inner end of the tractor, which is formed into a U-shape with a front opening when viewed from the rear and upper side, and has a lower limit stopper integrally formed at the front end thereof that is bent upward from the bottom wall, and the lower limit stopper is , the clutch pedal is placed so as to face the bottom wall so that it comes into contact with the upper surface of the bottom wall of the fuselage frame when the clutch pedal is depressed to the maximum extent, and one end of the return spring is engaged with the lower limit stopper. One end of a control wire is pivotally connected to the release mechanism of the control wire.

To explain the present invention based on the drawings, in FIG. 1, which is a partial cross-sectional view of the left side of an agricultural tractor,
Reference numeral 1 denotes a running clutch, which is composed of a flywheel 2, a clutch disk 3, a pressure plate 5, a diaphragm spring 6, a release bearing 7, and the like. The release sleeve 8 having the release bearing 7 is slidably fitted on the outside of a support sleeve 9, and the support sleeve 9 is attached to the rear wall 11b of the support bracket 11 fixed to the engine mounting bracket.
is fixed to. The support bracket 11 has a substantially U-shape facing the engine when viewed from above, and is fixed to mounting brackets on both sides of the flywheel 2. In FIG. 1, the right side wall 11a and rear wall 11b are visible. A main shaft support bearing 13 is arranged between the outer periphery of the main shaft 12 and the inner periphery of the support sleeve 9. That is, in this clutch 1, by sliding the release sleeve 8 forward (to the left in the figure), the pressure plate 5 slides rearward (to the right in the figure) via the diaphragm spring 6, and the clutch 1 is released. It's starting to break.

A release shaft 14, which is perpendicular to the main shaft 12, is rotatably supported on the support bracket 11.
A shift yoke 15 for pushing the release sleeve 8 forward and a shift arm 16 projecting upward are each integrally fixed to the release sleeve 4.

A mounting bracket 18 fixed to one end of a control wire (inner wire) 17 is rotatably connected to the upper end of the shift arm 16, and a first support member 19 fixed to the rear wall 11b of the support bracket 11 and the mounting bracket are connected to the upper end of the shift arm 16. A second return spring 20 fitted to the outside of the control wire 17 is compressed between the control wire 17 and the control wire 17, and this second return spring 20 moves the shift arm 16 toward the clutch connection position (the position indicated by the solid line in FIG. 1). energized. The first support member 19
A guide pipe (outer pipe) 26 is provided extending from the proximal end (end on the rotation center side) 21a of the clutch pedal 21 to the second support member 25 located above and behind the clutch pedal 21, and the control wire 17 is passed through the guide pipe 26. It extends toward the clutch pedal base end 21a side. One end of a control wire 17 is connected via a wire expansion/contraction adjustment device 10 to a wire bracket 22 fixed to the base end portion 21a of the clutch pedal. The body frame 24 is arranged on both left and right sides of the tractor, and the second support member 25
is fixed to the inside (on the opposite side in the figure) of the left side wall 24a of the left side body frame 24 shown in FIG.

Figure 2 shows the - cross section of Figure 1, and this second
In the figure, the shapes of the body frame 24, the wire bracket 22, the structure of the wire expansion/contraction adjustment device 10, etc. are made clear. However, the wire bracket 22 is shown in a ``--'' section to make its cross-sectional shape easier to understand. That is, the fuselage frame 24 is composed of a horizontal bottom wall 24b and a left side wall 24a that extends vertically upward from the left edge of the bottom wall 24b (however, in the right fuselage frame, the right edge of the bottom wall), and has a cross section L as a whole. It is formed into a letter shape. A support tube 31 passing through a hole in the left side wall 24a is fixed to the upper surface of the bottom wall 24b of the fuselage frame.
A base end 21a of a clutch pedal 21 is rotatably fitted into the clutch pedal 21, and a boss 32 is integrally fixed to the tip of the base end 21a by a pin 33, and a wire bracket 22 is attached to the boss 32. It is fixed.
The wire bracket 22 is formed, for example, in a U-shaped cross section so that its left and right portions face each other, and a lower limit stopper 34 that is bent leftward in the figure is formed at the upper end of the left side portion, and this lower limit stopper 34 and a second A first return spring 27 is tensioned between the support members 25 and biases the clutch pedal 21 toward the clutch connection position (the position indicated by the solid line in FIG. 1). The lower limit stopper 34 is configured to come into contact with the upper surface of the bottom wall 24b of the body frame 24 when the clutch pedal 21 is depressed to the maximum extent (phantom line in FIG. 1). That is, the bottom wall 24b of the body frame 24 itself and the lower limit stopper 34 constitute a lower limit stopper mechanism for the clutch pedal 21.

The wire expansion/contraction adjustment device 10 includes a connecting pin 23 that is rotatably supported by a wire bracket 22, and a hole 23 of the connecting pin 23 that is fixed to one end of a control wire 17 and is perpendicular to the connecting pin 23.
It consists of a male screw 28 inserted into the hole a, and two nuts 29 and 30 screwed into the male screw 28. That is, by adjusting the positions of the nuts 29 and 30 on the male thread 28, the tip of the release sleeve 8 (the left end in FIG. 1) and the diaphragm spring 6
The gap between the two (release gap) can be set to an appropriate gap. The release gap is the clutch pedal 21 when you start pressing the clutch pedal 21.
Therefore, when adjusting the above-mentioned gap, it is only necessary to adjust the clearance so that the idle stroke of the clutch pedal 21 is appropriate.
There is no need to work remotely. That is, by actually depressing the clutch pedal 21, you can check its free travel (the distance from when you start depressing the clutch pedal 21 until a large load starts to be applied to the rear foot), and you can check the control wire without leaving the vicinity of the clutch pedal 21. 17 telescopic adjustments can be made. Note that 11c in FIG. 2 is the left side wall of the support bracket 11.

As explained above, according to the present invention, (1) the structure of the lower limit stopper mechanism of the clutch pedal device can be simplified; That is, since the bottom wall 24b of the fuselage frame 24 is used as part of the lower limit stopper mechanism, the clutch pedal 12
There is no need to provide a special mating member for locking the lower limit stopper 34 on the side, so the stopper mechanism can be simplified and the manufacturing cost can be reduced.

To explain in more detail, the bottom wall of the fuselage frame 2
4b plays a total of three roles: the original role of the frame, the role of rotatably supporting the clutch pedal 21, and the role of a mating member for the lower limit stopper 34, making the tractor more compact and reducing the number of parts. This is advantageous in terms of reduction in the amount of energy and cost.

(2) There is almost no possibility that the wire expansion/contraction adjustment device 10 or the like near the base end portion 21a of the clutch pedal will be covered with mud or the like from the outside. That is, since the clutch pedal base end 21a to which the lower limit stopper 34 (wire bracket 22) is fixed is mounted inside the fuselage frame 24, that is, on the right side of the left side wall 24a and on the bottom wall 24b, the wire expansion/contraction adjustment device 10. The lower limit stopper 34, the first return spring 27, etc. are covered by the fuselage frame 24, so there is almost no possibility that the wire expansion/contraction device 10 or the lower limit stopper 34 will be exposed to mud or the like from the outside, and the clutch pedal The appearance of the vicinity of the base end portion 21a is also improved. Furthermore, the body width of the tractor can also be reduced.

To explain in more detail, since the clutch pedal base end 21 and the stopper mechanism are arranged on the inner side of the fuselage frame 24 having an L-shaped cross-section, the fuselage frame 24 protects the clutch pedal base end 21a and the stopper mechanism. It serves as a cover, thereby reliably preventing dirt etc. from getting on the clutch pedal base end 21 and the stopper mechanism from the outside, and eliminating the need for cleaning and maintenance of the clutch pedal base end.

(3) The lower limit stopper 34 is formed integrally with the bracket 22 by using a part of the wire bracket 22 fixed to the base end portion 21a of the clutch pedal, and the control wire 17 is attached to the wire bracket 22.
One end is pivotally connected, a lower limit stopper 34 is opposed to the bottom wall 24a, and one end of the return spring 27 is engaged with the lower limit stopper 34.

That is, one wire bracket 22 serves a total of three roles: a control wire support member, a lower limit stopper 34, and a return spring support member. Therefore, the number of parts for the clutch pedal can be significantly reduced, and the manufacturing process of the clutch pedal device is simplified.
Compactness can also be achieved.

(4) Furthermore, as described above, by forming the lower limit stopper 34 using a part of the wire bracket 22 and using the bottom wall 24a of the fuselage frame as a counterpart member of the lower limit stopper 34, the stopper is eventually It is not necessary to provide any special members as a device, and it is extremely economical.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional left side view of an agricultural tractor equipped with a clutch pedal device according to the present invention, and FIG. 2 is a cross-sectional view taken from FIG. 1. 21...Clutch pedal, 21a...Proximal end,
22... Wire bracket, 24... Airframe frame, 24a... Left side wall, 24b... Bottom wall, 34...
...lower limit stoppa.

Claims (1)

[Scope of utility model registration request] Body frame 24 placed on the side of the tractor
is formed into an L-shaped cross section by a generally horizontal bottom wall 24b and a side wall 24a extending upward from the outer end of the bottom wall 24b, and a support cylinder 31 is fixed to the upper surface of the fuselage frame bottom wall 24b, and the clutch pedal The base end 21a on the rotation center side of the clutch pedal 21 extends inward of the tractor from the side wall 24a and is rotatably supported by the support tube 31, and the base end 21a of the clutch pedal base end 21a on the inside of the tractor , front opening U seen from upper rear
A wire bracket 22 is fixed to the wire bracket 22, which is formed in a letter shape and integrally has a lower limit stopper 34 at the front end that bends upwards from the bottom wall, and when the clutch pedal 21 is depressed to the maximum extent, the lower limit stopper 34 is pressed against the bottom of the fuselage frame. The lower limit stopper 34 is arranged to face the bottom wall 24b so as to come into contact with the upper surface of the wall 24b, and one end of the return spring 27 is engaged with the lower limit stopper 34. Furthermore, the wire bracket 22 has a control connected to the release mechanism of the clutch. A clutch pedal device for an agricultural tractor, characterized in that one end of a wire 17 is pivotally connected.