JPH054536A - Vehicle body structure for mid-mount lawn mower - Google Patents

Abstract

(57) [Abstract] [Purpose] A mid-mount lawn mower equipped with a friction-type continuously variable transmission is configured for a pedal-type gear shifting operation that provides a comfortable steering feel, and a vehicle body structure suitable for that is realized. [Structure] At a front end portion of a transmission case M equipped with a differential mechanism and a continuously variable transmission, an operation arm 15 for gear-changing the continuously variable transmission is externally mounted so as to be swingable around a front-rear axis P and at the left and right axial centers. The transmission pedal 17 swinging around Z and the operation arm 15 are interlockingly connected via a relay crank 18 swingable around the vertical axis X, and the relay crank 18
Is supported by a reinforcing bracket 21 for mounting the mission case M on the body frame 4 having a monocoque structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure for a mid-mount lawn mower in which operation linking means for interlocking a transmission and a shift pedal are rationally arranged.

[0002]

2. Description of the Related Art A friction type continuously variable transmission (continuum)
ous variable transmission
(Hereinafter, abbreviated as CVT)] is known as a mid-mount lawn mower disclosed in JP-A-2-209651. This has a CVT separately from the mission case.

[0003]

The CVT has the advantage that it can be constructed at a lower cost than the hydrostatic continuously variable transmission, and is gradually becoming popular. Therefore, we have designed a mid-mount lawn mower in which the CVT is housed in the mission case and the transmission is compactly equipped, and the CVT is operated by a pedal with a good control feel. The present invention has an object to realize a vehicle body structure suitable for the pedal type gear shifting operation.

[0004]

In order to achieve the above object, the present invention is a mid-mount lawn mower, in which a CVT is internally mounted in a mission case in which a rear wheel is pivotally supported, and an operation arm for shifting the CVT is provided. It is mounted on the mission case while swinging around the front-rear axis, and the speed change pedal and the operating arm that are depressed around the left-right axis are interlocked via a relay crank that can swing around the vertical axis. It is characterized in that the relay cranks are connected to each other and are supported by a reinforcing bracket for mounting the mission case on the machine body.

[0005]

[Function] Since the operation arm of the CVT which has been internally mounted is mounted on the mission case so as to swing around the longitudinal axis,
The movement direction is different from the movement direction of the speed change pedal which is operated by depressing about the left and right axis. Therefore, in order to interlock these two, it is not possible to simply connect them by a rod or the like, so some kind of operation direction conversion mechanism is necessary. .. Further, since the transmission case has a large handle and a large weight due to the interior of the CVT, it is desirable to increase the strength of the mounting portion when mounting it on the airframe. Therefore, when a reinforcing bracket for mounting the mission case on the machine body is provided as a separate component, a relay crank serving as a mechanism for converting the operation direction is supported by the reinforcing bracket. According to this means, the relay crank is set in the vicinity of the transmission case, so that the members (rods, wires, etc.) that connect the transmission pedal and the relay crank do not protrude downward from the machine body, and the member does not protrude downward from the machine body. It is possible to dispose them, and it is possible to provide a structure that is convenient for a mid mount mower that requires a large space in the lower abdomen of the machine.

[0006]

As a result, the pedal type gear shifting operation can be carried out while the CVT is internally mounted and the weight of the mission case is sufficiently strong by devising that the bracket for reinforcing the mounting strength of the mission case has the function of supporting the relay crank. The structure could be reasonably set in a convenient state for a mid-mount lawn mower.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Figure 5 shows a mid-mount riding lawn mower,
Reference numeral 1 is a front wheel, 2 is a rear wheel, 3 is a mission, 4 is a body frame of a monocoque structure that constitutes the airframe, E is an engine mounted at the rear of the airframe, and 29 is a mower. Mission 3
The CVT 8 using the taper cone, the forward / reverse rotation mechanism 9, and the differential mechanism 10 are sequentially arranged in this order in the mission case M from the upper side in the power transmission direction. As shown in FIG. Input pulley 11 mounted on shaft 6
And a drive pulley 12 of the output shaft 5 of the engine E and a tension pulley 1 pivotally supported by an engine mounting base (not shown).
The main clutch C is composed of 3 and the double belt 14. Reference numeral 7 is a pulley for driving the mower 29.

As shown in FIGS. 1 and 3, from the front end of the mission case M, an operating arm 15 which swings around the front-rear axis P is projected, and the operating arm 15 is swingably operated. This is a configuration for shifting the CVT 8. The operation arm 15 and the speed change pedal 17 mounted on the control floor 16 and operated by depressing about the left-right axis Z are interlocked by a relay crank 18, which is rotatable around the vertical axis X, a connecting rod 19, and an interlocking rod 20. A relay crank 18 is rotatably supported by a reinforcing bracket 21 which is connected to the front portion of the mission case M and is mounted to compensate for the strength of mounting the front portion of the body on the vehicle body frame 4. The reinforcing bracket 21 made of a plate material has its front and rear portions bolted to the vehicle body frame 4, the left end bent portion 21a is bolted to the mission case M, and a spring for energizing and energizing the main clutch C is provided. A mounting portion 23 for 22 is also provided. As shown in FIG. 1, the mission case M is provided with a brake arm 24 for operating an internal braking device (not shown). Then, as shown in FIG. 4, the brake arm 2
4 and the brake pedal 25 are interlockingly connected by a rod 30 via a flexible spring mechanism 26, and the brake pedal 2
5 and the anti-connecting rod side of the relay crank 18 are interlockingly connected by a connecting rod 28 via a preload spring mechanism 27. That is, when the brake pedal 25 is stepped on while the vehicle is traveling with the shift pedal 17 stepped on, the brake arm 24 is operated to brake, and the linking rod 28 is used to forcibly move the operation arm 15 to the neutral position (lowest speed side). It works together to improve safety.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a bottom view showing an underfloor structure at the rear of the fuselage.

FIG. 2 is a structural diagram of a main part showing a main clutch.

FIG. 3 is a sectional front view showing a structure of a mission portion.

FIG. 4 is a perspective view of a brake pedal portion showing a brake operation structure.

[Figure 5] Side view of a mid-mount lawn mower

[Explanation of symbols]

 2 Rear wheels 8 Frictionless continuously variable transmission (CVT) 15 Operation arm 17 Transmission pedal 18 Relay crank 21 Reinforcement bracket M Mission case P Front-rear shaft center Z Left-right shaft center

Claims (1)

Claims: 1. A friction type continuously variable transmission (8) is installed in a transmission case (M) having a rear wheel (2) pivotally supported, and the friction type continuously variable transmission (8). A gear shift operation is performed by mounting an operation arm (15) for gear shift operation on the mission case (M) in a state of swinging operation around a front-rear axis (P) and depressing operation around a left-right axis (Z). Pedal (1
7) and the operation arm (15) are interlockingly connected to each other via a relay crank (18) swingable around a vertical axis, and the relay crank (18) is connected to the mission case (M). Reinforcement bracket (2 for mounting on the aircraft
The body structure of a mid-mount lawn mower supported by 1).