JP3140341B2 - Work vehicle shift operation unit structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift operation portion structure of a working vehicle equipped with a continuously variable transmission, such as a lawn mower or a garden tractor, and more particularly, to a plan view in which a front portion extends laterally outward of a vehicle body. It has a substantially inverted L-shape, with the front extension part being a forward operation part,
A speed change pedal having a rear portion as a reverse operation portion is provided so as to be swingable around a horizontal axis center in a horizontal posture orthogonal to the front-rear direction and positioned midway between the forward operation portion and the reverse operation portion. The transmission pedal is linked to the continuously variable transmission so that the traveling speed is steplessly changed to the forward side by depressing the forward operation unit while the traveling speed is steplessly changed to the reverse side by depressing the reverse operation unit. The present invention relates to a shift operation unit structure of a working vehicle that is being driven.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Laid-Open Publication No. Hei 6-44614, a shift operation portion structure of a work vehicle of this type has a rear edge, which is a stepped operation portion, of a flat forward operation portion, and has a horizontal shaft center. Is formed in a posture parallel to the above.

However, this conventional technique has the following disadvantages. That is, as shown in FIG.
Forward operation section 4F of the shift pedal 4 for adjusting the forward speed
Is generally performed by stepping on the forward operating section 4F on the toe side by placing the heel on a step and performing a vertical movement of the toe with the heel as a fulcrum. When the forward operating section 4F is operated, Depending on the driver's work situation, there is a case where the inside of the forward operation unit 4F is stepped on, or a case where the toe is opened outward and the outside end side of the forward operation unit 4F is stepped on. Attitudes vary widely depending on driving conditions. 4R is a reverse operation unit, 4A is a pedal axis, and X is a horizontal axis.

Therefore, when the inner end side of the forward operation unit is stepped on, and when the outer end side of the forward operation unit is stepped on, the toe stepping on the forward operation unit shifts back and forth with respect to the rear edge 4a, and the stepping operation is performed. The feeling is different, and the shifting operation is easy to jerky.

Therefore, as seen in, for example, Japanese Patent Application Laid-Open No. 7-96881, the horizontal axis is provided in an oblique posture that is located rearward toward the laterally outward side, and the rear edge of the forward operating portion is oriented toward the laterally outward side. The front and rear portions of the forward operation portion with respect to the rear edge of the forward operation portion are formed when the rear end is formed in a posture positioned rearward, and when the inner end side of the forward operation portion is stepped on and the toe is opened and the outer end side of the forward operation portion is stepped on. Techniques have been developed to reduce the displacement and make the operation feel substantially the same.

[0006] However, in the case of this conventional technique, although the inconvenience of the operation feeling with respect to the operation pedal can be eliminated, the shaft forming the horizontal axis is stepless in order to arrange the horizontal axis in an oblique posture. The structure linked to the transmission has been complicated and troublesome. That is, in general, the operation input shaft (trunnion shaft) on the continuously variable transmission side is arranged in a horizontal posture orthogonal to the front-rear direction, so that the operation input shaft and the horizontal axis do not become parallel, and It was necessary to devise linkages, such as using a ball joint.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide any one of the whole range from the inner end to the outer end of the stepped operation portion without complicating the structure of linkage with the continuously variable transmission. The point is that the stepping operation can be performed with the same operational feeling even when the stepping operation is performed on a part.

[0008]

The structure, operation and effect of the first invention according to the first aspect of the present invention are as follows.

[Structure] A vertical plate portion along the front-back direction and a horizontal plate portion along the left-right direction
It is formed into a substantially inverted L-shape in plan view from the orientation plate part.
And the front part extending laterally outward along the left and right direction
A speed change pedal with the reverse operation section as the reverse operation section,
The front and rear are located in the middle between the forward and backward operation units.
Swinging around a horizontal axis center in a horizontal posture perpendicular to the
When the shift pedal is depressed with respect to the forward operation section,
While continuously changing the traveling speed to the forward side,
Step speed on the reverse side by stepping on the section
Link the transmission pedal to the continuously variable transmission to change
In the structure of a shift operation portion of a work vehicle, the shift pedal
Pedal on the step outside of the vertical plate part
Space for heel rest during operation of
At the point corresponding to the area immediately in front of the heel located between
Connecting portion between the vertical plate portion and the vertical plate portion
It is curved with positioning the portion, of the change pedal
Move the stepped operation portion of the forward operation portion with respect to the horizontal axis
The heel rest
From the heel to the tread
The distance between the stepped part in the bend part and the sideways
It is approximately the same as the lateral outer end of the stepped operation part in the plate part
The shift operation unit structure of the work vehicle set to be equal .

[Operation] While the horizontal axis, which is the rocking axis of the speed change pedal, is arranged in a horizontal posture orthogonal to the front-rear direction,
Since the stepped operation portion is formed so as to be displaced rearward toward the outside in the lateral direction, any part of the stepped operation portion can be performed without complicating the linkage structure between the shift pedal and the continuously variable transmission. Even when the stepping operation is performed, the stepped operation portion can be stepped with substantially the same toe side portion.

[Effects] Accordingly, even if the stepping position of the shift pedal is changed by the driver's work condition without changing the structure of the linkage between the shift pedal and the continuously variable transmission, the position can be changed. In any case, the stepping operation can be performed with the same feeling, and the desired forward speed continuously variable transmission can be smoothly performed.

The configuration, operation and effect of the second invention according to the second aspect of the present invention are as follows.

[Structure] In the structure of the first invention, the forward operating portion is provided with a wavy shape having a top surface formed of a convex curved surface in a horizontal posture.

[Operation] In the entire width of the stepped operation portion,
When depressing the speed change pedal, the contact portion of the sole moves along the curved surface with the stepping operation, so that the stepped operation portion is almost the same toe side portion over the entire range of the operation range of the speed change pedal. Since the stepping operation can be performed, the feeling of the stepping operation with respect to the stepped operation portion can be made substantially constant in any forward shift state.

[Effects] As a result, in the entire range of the stepping operation range, the feeling of the stepping operation with respect to the speed change pedal is good, and the shift can be smoothly performed without jerking.

The configuration, operation and effect of the third invention according to the third aspect of the present invention are as follows.

[Structure] In the structure of the first invention or the second invention, an attitude adjusting means for adjusting the attitude of the speed change pedal in plan view is provided.

[Operation] Some drivers operate the shift pedal by moving the toe to the inside (closer) and stepping on the shift pedal by moving the toe to the outside (open). In such a situation, the posture of the foot with respect to the shift pedal when the driver steps on the shift pedal varies widely. Focusing on this, the position of the shift pedal is adjusted to adjust the position of the stepped operation part, so for example, in the case of a driver who closes the toe and operates the shift pedal without permission, The posture of the stepped operation portion is adjusted to a gentle inclination posture in which the amount of displacement of the lateral outer end with respect to the lateral inner end is small and the inclination angle with respect to the horizontal axis is small,
On the other hand, in the case of a driver who opens the toe and depresses the shift pedal without permission, the posture of the stepped-operated portion is changed in the opposite direction because the amount of rearward displacement of the lateral outer end with respect to the lateral inner end is large. By adjusting the attitude of the shift pedal in accordance with the driver, for example, adjusting the attitude to the steep inclination angle with a large inclination angle with respect to the axis, it is easy to match the stepping operation feeling to each driver.

[Effects] As a result, the driver can easily depress the shift pedal with a good operational feeling, regardless of whether the driver is a driver who closes the toe or a driver who opens the toe.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a lawn mower as an example of a working vehicle is equipped with an engine E, a driver's seat S, and a steering wheel H. A front mower 2 is attached to a wheel-steering riding type main body 1 via a link L so as to be able to move up and down freely.

The riding type machine 1 is provided with a hydrostatic stepless transmission 3 as a traveling transmission, and its operation unit includes a vertically-oriented plate portion extending in the front-rear direction and a left-right direction.
And a horizontal plate portion along the
A speed change pedal having a front portion extending in the right direction extending substantially laterally outwardly of the vehicle body and having a substantially inverted L shape in plan view, a front extension portion serving as a forward operation portion 4F, and a rear portion serving as a reverse operation portion 4R. 4 is attached to the body frame 5 so as to be swingable around a horizontal axis X having a horizontal posture perpendicular to the front-rear direction and positioned at the front-rear intermediate position between the forward operation unit 4F and the reverse operation unit 4R. While the traveling speed is steplessly changed to the forward side by the stepping operation on the operation unit 4F, the traveling speed is steplessly changed to the reverse side by the stepping operation on the reverse operation unit 4R.
The speed change pedal 4 is linked to the hydrostatic continuously variable transmission 3. Reference numeral 6 denotes a step, as shown in FIGS. 3 and 4, the heel is placed on this step 6, and the forward operation unit 4F is operated by the up and down movement of the toe supporting the heel.

As shown in FIGS. 3 to 5, means for linking the shift pedal 4 with the hydrostatic continuously variable transmission 3 includes an arm a4 integrally connected to a pedal shaft 4A, and a hydrostatic continuously variable transmission. 3 is a means for linking the trunnion shaft 3A and the arm a3 integrally connected by a rod 7 with a turnbuckle for length adjustment.

As shown in FIG. 4, the speed change pedal 4 is in the neutral position for shifting operation, and the rearward operation portion 4R
Is positioned substantially horizontally, and the first half is formed in a forwardly inclined posture.

As shown in FIG. 4, the forward operation section 4F of the speed change pedal 4 has a wavy shape having an upper surface formed by a convex curved surface in which the generatrix is oriented sideways. In other words, it has a substantially semi-cylindrical shape, and the top of the upper surface and the vicinity thereof are the stepped operation portion 4a.

As shown in FIG. 3, the stepped operation portion 4a is configured such that the whole of the forward operation portion 4F is displaced rearward toward the outside in the lateral direction, so that it is displaced rearward toward the outside in the lateral direction. Is formed. That is, the stepped operation portion 4a
Is inclined with respect to the horizontal axis X. In addition, a non-slip 8 for preventing the foot from sliding in the lateral direction with respect to the upper surface is provided on the entire upper surface of the speed change pedal 4.
Is formed at the lateral outer end thereof with a retaining projection 9 for preventing the foot from coming off the operating pedal 4 laterally outward.

According to the above embodiment, the forward operating section 4
When working down the F, as shown in FIG. 3 (a) (ii)
When the toe is moved in (closed) and the stepping operation is performed,
In any case where the toe is moved outwardly (opened) to perform the stepping operation, the stepped-operation portion 4a can be stepped at substantially the same toe-side portion, so that the operation feeling is substantially the same and the speed change operation is performed smoothly. Can be.

Further, since the anti-slip 8 is provided, the skid of the foot with respect to the shift pedal 4 is suppressed, and
It is easy to reliably and accurately perform the stepping operation.

Furthermore, since the stopper projection 9 is provided,
Depressing the shift pedal 4 can be sufficiently suppressed, and the stepping operation on the shift pedal 4 can be easily and reliably performed.

[Alternative Embodiment] In the above-described embodiment, as shown in FIGS. 6A and 6B and FIG. 7, an attitude adjusting means 10 for adjusting the attitude of the speed change pedal 4 in a plan view is provided. . The attitude adjusting means 10 moves the speed change pedal 4 perpendicular to the horizontal axis X with respect to the pedal shaft 4A, and
Rotatably attached around the vertical axis Y perpendicular to R,
A bolt / nut 11 for fixing the rotation posture of the shift pedal 4 with respect to the pedal shaft 4A is provided.
Side bolt insertion hole 12 is formed in a long hole around the vertical axis center Y,
Then, the transmission pedal 4 is rotated with respect to the pedal shaft 4A while the bolts and nuts 11 are loosened to adjust the posture of the transmission pedal 4 in a plan view, and then the bolts and nuts 11 are tightened to obtain the adjusted posture. It is configured to be fixed.

In the above embodiment, an example of application to a lawn mower has been described, but the present invention can be applied to various work vehicles.

In the above embodiment, the upper surface of the forward operation portion 4F is formed as a convex curved surface, and the top portion and the vicinity thereof are the stepped operation portion 4a. However, the forward operation portion 4F is formed in a round bar shape. You may.

In carrying out the first aspect of the present invention, the upper surface of the forward operation section 4F may be formed in an uneven plane. In this case, the rear edge of the forward operation portion 4F becomes the stepped operation portion 4a.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment.

FIG. 2 is a plan view of a main part showing an embodiment.

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

FIG. 4 is an enlarged side view of a main part showing the embodiment.

FIG. 5 is an enlarged vertical sectional view of a main part showing the embodiment;

FIG. 6 is a cutaway enlarged plan view of a main part showing another embodiment.

FIG. 7 is a cutaway enlarged side view of a main part showing another embodiment.

FIG. 8 is an enlarged plan view of a main part showing a conventional example.

[Explanation of symbols]

 Reference Signs List 3 continuously variable transmission 4 speed change pedal 4F forward operation part 4R reverse operation part 4a stepping operation part X horizontal axis Y Y vertical axis 10

Continuation of the front page (56) References JP-A-52-149721 (JP, A) JP-A-7-96781 (JP, A) JP-A-2-221756 (JP, A) JP-A-2-29932 (JP, A) , A) Shokai Sho 56-108952 (JP, U) Shokai Hei 6-44614 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60K 26/00-26/04 F16H 59/06

Claims (3)

(57) [Claims] 1. A longitudinal plate portion along the front-rear direction and left and right
From the horizontal plate part along the direction
Laterally outside the front part formed in the shape of a letter and along the left-right direction
The speed change pedal (4) having the forward extending portion as the forward operating portion (4F) and the rear portion as the reverse operating portion (4R) is provided between the forward and backward operating portion (4F) and the backward operating portion (4R). The shift pedal (4) is provided so as to be swingable around a horizontal axis (X) having a horizontal posture orthogonal to the front-rear direction.
F), the speed of the transmission pedal (4) is steplessly changed so that the traveling speed is continuously changed to the forward side by the stepping operation on the reverse operation unit (4R) while the traveling speed is continuously changed to the forward side by the stepping operation on F). A shift operation part structure of a work vehicle linked to a transmission (3), wherein a laterally outward portion of a vertical plate portion of the shift pedal (4) is provided.
Step (6) on the heel for pedal operation
In front of the heel, which is located in the space for placing the heel
The horizontal plate portion and the vertical
Position the bend, which is the connection with the plate
Of the forward operation section (4F) of the speed change pedal (4).
The working part (4a) is moved laterally outward with respect to the horizontal axis (X).
The rearwardly displaced posture, and the space for placing the heel
The distance from the heel located at the point to the stepped operation part (4a)
A stepping operation portion (4a) in a bending portion;
Of the stepped operation portion (4a) in the horizontal plate portion
A shift operation unit structure of a work vehicle set so as to be substantially equal to a lateral outer end . 2. The shift operation unit structure for a working vehicle according to claim 1, wherein the forward operation unit (4F) is provided with a cambered shape having a top surface formed of a convex curved surface in a horizontal posture. 3. The shift operation unit structure of a work vehicle according to claim 1, further comprising an attitude adjusting means (10) for adjusting an attitude of the shift pedal (4) in a plan view.