JPH09272350A - Riding lawn mower - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To secure a hoisting space for mowers without being obstructed by a transmission system that transmits power from a mission case at the rear of an airframe to front wheels. SOLUTION: A mower M is provided at an intermediate position between front and rear wheels 1, and an external output shaft 15 for driving the mower M is provided on a front surface portion of a mission case 8, and a traveling output shaft 14 is set at a position above this. The transmission system from the traveling output shaft 14 to the front wheels 1 is connected to the first intermediate shaft 16 in a horizontal posture connecting to the traveling output shaft 14 and the front end portion of the first intermediate shaft 16 via the universal joint 19. The second intermediate shaft 2 in the front-lowering posture
And a bearing 18 for supporting the front end of the first intermediate shaft 16 is provided at an intermediate position between the front and rear wheels 1, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawn mower having an engine at the front of a vehicle body having front and rear wheels, a mission case at the rear, and a mower capable of moving up and down with respect to an intermediate position between the front and rear wheels. More specifically, the present invention relates to improvement of a transmission system for front wheels.

[0002]

2. Description of the Related Art Conventionally, there is a riding lawn mower constructed as described above in Japanese Patent Application Laid-Open No. 8-40093. In this conventional example, from the upper front surface of a continuously variable transmission arranged at the rear of the machine body. A power transmission system for the front wheels is formed so as to take out power from the front wheel output shaft in the front-lowering posture and transmit the power to the front wheel transmission having an input system in the horizontal posture via a universal joint or the like.

[0003]

In the above-mentioned conventional example,
A transmission system that transmits power from a relatively upper position of the front surface of the continuously variable transmission to the front wheels is formed, so that an elevating space for the mower can be secured relative to the upper position of the mower located at the intermediate position between the front and rear wheels. Has become. However, since the mission case is small in a relatively small body, there is a structure in which it is difficult to form the output shaft for driving the front wheels at a high position of the mission case,
In addition, there are many cases where the position of the input shaft such as the differential case of the front wheels is low, and in such a structure, in the case where the output shaft and the input shaft are directly connected by the transmission shaft, they are inclined to the position above the mower. As a result of the posture transmission shaft being arranged, it is difficult to secure a space for raising and lowering the mower, and there is room for improvement.

An object of the present invention is to provide a passenger space capable of forming a sufficient lifting space above the mower even if power is output to the front wheels from a relatively low position of a mission case arranged at the rear of the body. The point is to configure a lawn mower.

[0005]

As described at the beginning, the first feature of the present invention (claim 1) is that the front part of the traveling vehicle body having front and rear wheels is provided with the engine and the rear part is provided with the mission case. In a riding lawn mower provided with a mower capable of moving up and down with respect to an intermediate position between front and rear wheels, an external output shaft for driving the mower is formed on a front surface of the mission case, and power is transmitted from the mission case to rear wheels. A traveling output shaft for taking out power synchronized with the transmitted power is set above the external output shaft and formed on the front face of the transmission case, and a transmission system from this traveling output shaft to the front wheels is provided for traveling output. A first intermediate shaft in a horizontal posture connected to the shaft, and a second intermediate shaft in a front descending posture connected to a front end portion of the first intermediate shaft via a universal joint, and a front end portion of the first intermediate shaft. Support Located that it includes a bearing portion in an intermediate position of the front and rear wheels, the action is as follows.

A second aspect of the present invention (claim 2) is that the input portion of the mower is formed of a gear-internal type input case protruding from the upper surface of the mower, and the mower is driven by the external output shaft. Is configured so that it can be driven, and the arrangement position of the universal joint is set at a position on the front side of the input case. The operation is as follows.

[Operation] According to the first feature described above, the power from the traveling output shaft is transmitted to the first intermediate shaft in the horizontal posture and is transmitted to the second intermediate shaft in the front-lowering posture via the universal joint. The power from the second intermediate shaft is transmitted to the front wheels, and the power from the external output shaft located below the traveling output shaft is transmitted to the mower. Further, since the first transmission shaft is in the horizontal posture, a hoisting space can be secured above the mower, and the second intermediate shaft is in the front-lowering posture, so that the power of the front wheels can be lowered even if the input portion is in a low position. In addition, since the power is transmitted from the external output shaft at a low position to the mower set at a low position during work, the mower can be driven by a short distance transmission.

According to the above-mentioned second feature, since the input case on the upper surface of the mower is located directly below the universal joint of the front wheel drive system, when the mower is raised, the input case protrudes on the upper surface of the mower. It is possible to move up and down while avoiding contact with the second transmission shaft.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, an engine 3 is arranged in the front part of a traveling machine body having a front wheel 1 which is steerably driven and a rear wheel 2 which is driven, and a central portion of the machine body. A steering wheel 4 for steering the front wheels 1 and a driver's seat 5 at the rear,
A hydrostatic stepless transmission 7 for transmitting power from the engine 3 via a transmission shaft 6 and a transmission case 8 are connected to a lower portion of a rear position of the machine body, and further, a front wheel 1 and a rear wheel 2 are provided. A mower M is provided at an intermediate position between and to construct a riding lawn mower.

A differential case 11 for front wheels is supported at a front position of the traveling machine body so as to be able to roll around a longitudinal axis, and a gear interlocking mechanism 1 is provided at a rear position of the differential case 11.
The input shaft 13 is formed so as to project rearward via the input shaft 2. Further, on the front surface of the mission case 8, power is transmitted to the traveling output shaft 14 and the mower M for extracting power that is synchronized with the power transmitted from the mission case 8 to the rear wheels 2 and transmitting the power to the front wheels 1. The external output shaft 15 is formed. The first intermediate shaft 16 connected to the traveling output shaft 14 is arranged in a horizontal posture, and the front end portion of the first intermediate shaft 16 is supported by the bearing 18 provided on the machine body frame 17. A universal joint 19 is provided between the front end and the input shaft 13 at the rear of the differential case, and a second intermediate shaft 20 in a front-lowering posture is provided to form a drive system for the front wheels 1.

In the mower M, three blades 22 which rotate around the vertical axis are housed in a cutting blade housing 23, and an input case 25 is provided as an input section having an input shaft 24 in a rearward posture on an upper surface of a central position. Is formed so as to project upward, and this input case 25 incorporates power from the input shaft 24 with a drive shaft (not shown) of the blade 22 at the central position and a gear interlocking mechanism (not shown). A belt transmission system (not shown) that transmits the power from the drive shaft to the two blades 22 is provided so that the power transmitted to the input shaft 24 can simultaneously drive the three blades 22. In addition, the cutting blade housing 23 is provided with an anti-scalp roller 26 at the front portion thereof and a gauge wheel 27 at the rear portion thereof.
The mower M is supported so as to be able to move up and down with respect to the machine body frame 17 via a link mechanism L.

A drive shaft 29 for transmitting power via a universal joint 28 is provided between the input shaft 24 and the external power shaft 15 of the mission case 8 to drive the mower M with the power from the mission case 8. It is configured so that it can be done. Further, the position of the universal joint 19 connecting the first intermediate shaft 16 and the second intermediate shaft 20 is set to a position deviated to the front side from the position above the input case 25 of the mower M.

With this structure, the mower M is lifted above the mower M and below the first intermediate shaft 16 while avoiding contact between the input case 25 protruding above the mower M and the second shaft 20. Since the space is formed and the second intermediate shaft 20 is in the front-lowering posture, even if the input shaft 13 of the front wheel 1 is formed at a low position, the vertical space of the mower M is not reduced. In addition, a drive system for transmitting power from the external output shaft 15 formed below the traveling output shaft 14 from a low position to the mower M set at a low position during work is formed. The system is also configured without difficulty.

As shown in FIGS. 1, 3 and 4, a support member 32 of the driver's seat 5 is arranged at an intermediate position in the left-right direction between the left and right rear fenders 31, 31. A pair of left and right frames 33 formed at the front position of the driving seat 32 are provided with a supporting shaft 34 in a lateral posture, and the driving seat 5
A bracket 35 formed on the bottom surface of the driver seat 5 is swingably supported, and a cushion spring 36 that abuts on the rear bottom surface of the driver seat 5 is provided at the rear position of the support member 32. Further, a spring 38 for supporting the arm 37 swingably up and down around the support shaft 34 and biasing the arm 37 upward is formed with a base end member 37A integrally formed with the arm 37 and the support member 3.
2 and the arm 37 by contact with the base end member 37A.
The pin 39 that sets the upper swing limit of the
The switch 40 is provided on the bottom surface of the driver's seat 5 and can be brought into contact with the end of the arm 37.

With this switch 40, an operator is seated on the driver's seat 5 and the operation portion 40A of the switch 40 is pressed while the cushion spring 36 is compressed by a predetermined amount as shown in phantom in FIG. Is detected, and the arm 37 is allowed to swing downward when the driver's seat 5 is greatly lowered as in the case of giving a shock to avoid damage to the switch 40. Is configured to get. The switch 40 stops the engine 3 when a worker falls from the driver's seat 5 during work, and cannot start the engine 3 even if the driver does not sit on the driver's seat 5 at the start of work. Has been used to

This lawnmower is provided with a pair of left and right lift arms 42 which are configured to be driven and lifted up and down by hydraulic cylinders (not shown) at the rear position of the mission case 8, and an external power source is provided on the rear surface of the mission case 8. Drive shaft 43
As shown in the figure, an external power drive is applied to a working device (not shown) connected through a three-point link mechanism composed of an upper top link 44 and a lower left and right lower link 45. The power from the shaft 43 is transmitted and the working device can be moved up and down by driving the lift arm 42.

[0017]

Therefore, even if power is output to the front wheels from a relatively low position of the mission case arranged at the rear of the machine body, a sufficient lifting space is formed above the mower, and the mower is also formed. Therefore, a riding lawn mower capable of transmitting power in a reasonable manner was reasonably constructed (Claim 1). Further, even if the input case projects on the upper surface of the mower, a sufficient up-and-down space can be formed above the mower (claim 2).

[0018]

[Brief description of drawings]

FIG. 1 is an overall side view of a riding lawn mower with a mower lowered.

FIG. 2 is an overall side view of the riding lawn mower with the mower raised.

[Fig. 3] Side view of a supporting system of a driver's seat

FIG. 4 is a front view of a supporting system of a driver's seat.

[Explanation of symbols]

 1 Front Wheel 2 Rear Wheel 3 Engine 8 Mission Case 14 Travel Output Shaft 15 External Output Shaft 16 First Intermediate Shaft 18 Bearing Part 19 Universal Joint 20 Second Intermediate Shaft 25 Input Part M Mower

Claims (2)

[Claims] 1. A riding lawn mower comprising an engine at a front portion of a traveling vehicle body having front and rear wheels, a mission case at a rear portion thereof, and a mower capable of moving up and down with respect to an intermediate position between the front and rear wheels. An external output shaft that drives the mower is formed on the front surface of the mission case, and a traveling output shaft that takes out power in synchronization with power that is transmitted from the mission case to the rear wheels is set at a position above the external output shaft. The transmission shaft from the traveling output shaft to the front wheels is connected to the traveling output shaft by a horizontal first intermediate shaft and a front end of the first intermediate shaft. A riding lawn mower having a bearing part which is composed of a second intermediate shaft in a front-lowering posture which is connected via a universal joint and which supports a front end part of the first intermediate shaft at an intermediate position of front and rear wheels. 2. The input part of the mower is formed by a gear-internal type input case projecting on the upper surface of the mower so that the mower can be driven by the power from the external output shaft. The riding lawn mower according to claim 1, wherein an arrangement position of the universal joint is set at a front position.