JP2000236704A - Tractor power take-out structure - Google Patents

Abstract

(57) [Problem] To provide a highly versatile tractor power take-out structure capable of performing both work with a mid-mount type work device and work with a front-mount type work device. SOLUTION: A mid-mount type working device 9 is detachably disposed between a front wheel 1 and a rear wheel 2, and power is transmitted to the mid-mounted type working device 9 from a rear side of a vehicle body via a transmission shaft 14. And a mid-mount type working device 9
When the power transmission shaft 14 is detached from the lower abdomen space of the vehicle body, an auxiliary transmission mechanism 33 that is interlocked with the transmission shaft 14 and transmits power to the front of the lower abdomen space of the vehicle body is detachably provided to the vehicle body. The power transmission 55 is wound around the drive rotary member 37 provided in the section and the driven rotary member 32 disposed above the drive rotary member 37 and on the vehicle body side, and work power is taken out in conjunction with the driven rotary member 32. A power take-out structure for a tractor having a shaft 29 extending forward of a vehicle body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor power take-out structure for taking out work power.

[0002]

2. Description of the Related Art Conventionally, in a tractor in which a snow blower for performing a snow removing operation, or a front mount type working device such as a front mower or a sweeper, which is mounted on a front side of a fuselage, an output shaft from an engine is previously provided. Is known in which the working device is projected forward from the front end of the machine body to directly connect the working device to an output shaft from an engine in a state where the working device is mounted on the machine body. Also, there is known a tractor in which a mid-mount type working device, for example, a mid mower or the like is mounted in a lower abdominal space between a front wheel and a rear wheel of the aircraft to transmit power to the working device from the rear side of the aircraft. I have.

[0003]

However, in the prior art, a tractor for mounting and working with a front-mount type working device and a tractor for mounting and working with a mid-mount type working device are specified respectively. There was only one dedicated to use. For this reason, there has been a demand for a tractor which can work not only on a foot mount type working device but also on a mid mount type working device.

The present invention has been made in view of the above-mentioned circumstances, and provides a versatile tractor power take-out structure which can be operated by a mid-mount type working device and can also be operated by a front-mounted type working device. With the goal.

[0005]

(Structure) In the power take-out structure for a tractor according to the first aspect of the present invention, a mid-mount type working device is removably arranged between a front wheel and a rear wheel. The vehicle is configured to transmit power to a mount-type working device from a rear side of the vehicle body via a transmission shaft, and the transmission shaft is interlocked and connected to the vehicle body in a state where the mid-mount type working device is removed from a lower abdomen space of the vehicle body. An auxiliary transmission mechanism for transmitting power to the front of the lower abdominal space is detachably provided to the vehicle body, and a driving rotator provided at a front end of the auxiliary transmission mechanism is disposed on the vehicle body at a higher level than the driving rotator. And a working power take-off shaft interlocked with the driven rotator extending forward of the vehicle body.

(Operation) According to the configuration of the first aspect of the present invention, a tractor which can be detachably mounted with a mid-mount type working device to perform a work is removed from the tractor. In this state, an auxiliary transmission mechanism, which is interlocked with a transmission shaft capable of transmitting power from the rear of the aircraft, is mounted on the front side of the lower abdominal space of the aircraft, and is provided on the drive rotating body of the auxiliary transmission mechanism and on the vehicle body side. The work power take-off shaft extending forward of the vehicle body can be driven to rotate by winding a belt or chain or other wrapping transmission device over the driven rotator. When a front-mount type working device is linked to the input device so as to be able to be input, work by the front-mount type working device becomes possible.

(Effects) Therefore, according to the configuration of the first aspect of the present invention, the power take-out shaft for driving the working device, which is protruded forward from the front end of the machine body, according to the difference in the work form, is provided with the front mount type. The state can be appropriately changed between a state in which the working devices are connected and driven and a state in which the mid-mount type working device arranged in the lower abdomen of the vehicle is driven, so that the versatility of the working form can be enhanced.

(Structure) According to a second aspect of the present invention, in the tractor power take-out structure according to the first aspect, the auxiliary power transmission mechanism is configured such that the mid-mount type working device places the mid-mount type working device in the space in the lower abdomen of the vehicle body. It is characterized in that it is configured to be able to be engaged and attached to a locking tool for detachably attaching.

(Operation) According to the structure of the second aspect of the present invention, the locking device for detachably attaching the mid-mount type working device to the lower abdominal space of the vehicle body is used.
Since the auxiliary power transmission mechanism can be engaged and mounted, it is not necessary to provide a special member for mounting the auxiliary power transmission mechanism.

(Effects) Therefore, according to the configuration of the second aspect of the present invention, since there is no need to provide a special member for mounting the auxiliary transmission mechanism, the number of parts can be reduced and cost can be reduced. Can be.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an engine 3 is arranged at a front portion of a traveling body including front wheels 1, 1 that can be steered and driven rear wheels 2, 2, and a central portion of the traveling body is provided. A steering handle 4 for steering the front wheels 1, 1 is provided, and a driver seat 5 is provided at the rear of the traveling body, and an engine 3 is provided at a lower rear portion of the traveling body.
And a transmission case 8 in which the power from the transmission is transmitted via a transmission shaft 6 and a transmission case 8.
Further, a mower 9 is provided at an intermediate position between the front wheels 1, 1 and the rear wheels 2, 2 to constitute a tractor used as a garden tractor.

An axle support case 10 for front wheels is supported at a front position of the traveling body so as to be freely rollable around a longitudinal axis Y.

The mower 9 includes three cutting blades rotating around a longitudinal axis in a cutting blade housing 20 and an input shaft 21 having a rearward posture on an upper surface at a central position.
The input case 22 is provided with the input case 22. The input case 22 distributes and transmits power to each cutting blade blade. By providing a drive shaft 24 that transmits power via the universal joint 23 between the input shaft 21 and the external output shaft 14 of the transmission case 8, the power from the transmission case 8 drives the mower 9. Further, the mower 9 is supported via a link mechanism 25 so as to be able to move up and down. That is, the front link member 26 pivotally supported by the front end of the cutting blade housing 20 is connected to the body frame 1.
6 are supported on support hooks 27, 27, which are provided as a pair of right and left locking tools, at the front end of the cutting blade housing 20 so as to swing freely around the horizontal axis. A pair of right and left rear link members 28, 28 are pivotally supported on the body frames 16, 16 respectively around a horizontal axis. An unillustrated elevating drive means is linked to the rear link members 28, 28 so that the elevating drive means (for example, a hydraulic cylinder or the like) can freely move up and down between an appropriately raised posture and a lowered working posture. I have.

As shown in FIG. 3, a work power take-out extending forward through the horizontal frame portion 16A is provided substantially at the center of the horizontal frame portion 16A at the front end of the body frame 16 in the left-right direction. A shaft 29 is provided. The work power take-off shaft 29 is provided on the horizontal frame 1.
A driven pulley 32 as a driven rotary body is connected to a bracket 30 fixed to 6A via a bearing 31 so as to be rotatable around a longitudinal axis Y2 via a bearing 31 so as to rotate integrally with the bracket 30. ing. When the mower 9 is mounted on the body, the working power take-out shaft 29 is in a free state, that is, no driving force is transmitted.

As shown in FIGS. 2 to 9, the mower 9 is removed from the lower abdominal space S together with the link mechanism 25 so that the power from the transmission case 8 can be transmitted to the working power take-off shaft 29. The auxiliary transmission mechanism 33 can be arranged on the front side of the lower body abdominal space S. More specifically, the auxiliary transmission mechanism 33 is configured such that the transmission shaft 35 is penetrated by a cylindrical bracket 34 that is long in the front and rear direction, is rotatably supported by bearings, and has a shaft end portion of the transmission shaft 35 that projects rearward from the cylindrical bracket 34. A coupling portion for coupling and connecting a universal joint 36 to be described later is formed on the shaft, and a driving pulley 37 is coupled to the shaft end of the transmission shaft 35 protruding forward from the cylindrical bracket 34 so as to rotate integrally. It is composed. A front support member 38 for supporting the axle support case 10 on the pair of left and right front-rear frames 16B, 16B of the body frame 16 so as to be swingable about the front-rear axis Y.
The engagement pin 41 integrally connected to the rear side of the cylindrical bracket 34 of the auxiliary transmission mechanism 33 can be engaged and disengaged with the locking hook 40 provided on the rear support member 39 of the rear support member 39. Has become. On the other hand, as shown in FIG. 10, the auxiliary transmission mechanism 33 is supported on the front body frame 16 by a pair of right and left mountings which are mounted on the front part of the cylindrical bracket 34 so as to extend forward and upward by welding. This is performed by engaging and holding the locking pins 43, 43 at the distal ends of the stays 42, 42 with the pair of left and right support hooks 27, 27. As shown in FIGS. 8 and 9, the support hooks 27, 27 include a pair of left and right sheet metal fixing portions 27 A fixed to the front support member 38 and a horizontal axis X with respect to the fixing portions 27 A. The left and right support frames 27, 27 are composed of a pair of left and right movable parts 27B made of sheet metal pivotally supported.
Each of the movable parts 27B, 27B is connected with a horizontal rod member 44 in a bridge state, and the arm 45 for manual operation is in a state in which the horizontal rod member 44 projects to the left side of the left movable part 27B.
Is provided. Each of the fixing portions 27A, 27A is formed with a locking groove 46 for locking the horizontal rod member 44, and the movable portion 27 of each of the two support hooks 27, 27 is formed.
B has a concave portion 47 that can be engaged with the locking pin 43 at the lower side, and the fixed portion 27A has a concave portion 48 that can engage with the locking pin 43 at the upper side. Provided. And the right support hook 27
As shown in FIGS. 7 and 8, a lock structure L for fixing and holding the movable portion 27B on the fixed portion 27A is provided. That is, the right movable portion 27B is disposed at a position laterally outside the fixed portion 27A, and the right fixed portion 27A
A through hole 49 penetrating in the lateral direction is formed in the movable portion 27B while the lock pin 51 inserted through the through hole 49 from the right side is elastically urged leftward by a spring 52.
Are provided so as to be able to move left and right with respect to a pin supporting bracket 53 fixed to the right lateral surface of the bracket. Thus, when the auxiliary transmission mechanism 33 is supported by the support hooks 27, the lock pin 51 is first pulled to the right and pulled out of both the through holes 49, and in this state, the manual operation arm 45 or the like is operated to operate the auxiliary transmission mechanism 33. The movable portions 27B, 27B are removed from the locking grooves 46, 46 of the fixed portions 27A, 27A, and the locking pins 43, 43 of the auxiliary transmission mechanism 33 are locked in the concave portions 47, 47 of the movable portions 27B, 27B, respectively. In this state, the movable parts 27B, 2
7B is fixed to the fixing grooves 27 of the fixing portions 27A, 27A.
6, 46 are engaged. Thereafter, the arm 4 for manual operation is set around the horizontal rod member 44 engaged with the locking grooves 46, 46 as a central axis.
By swinging the back 5, the locking pins 43 are lifted so as to engage with the recesses 48 of the fixing portions 27A. Then, the locking pins 43, 43
When the lock pin 51 reaches the position where it engages with the concave portions 48, 48 of the 7A, 27A,
The movable parts 27B, 2
7B and thus the auxiliary transmission mechanism 33 is fixed to the fixing portions 27A, 27A.
It is fixed against. At the time of fixing, the fixing operation is performed with the engagement pin 41 locked by the locking hook 40.

The rear end of the transmission shaft 35 of the auxiliary transmission mechanism 33 and the external output shaft 14 of the transmission case 8 are interlocked via a universal joint 53, a second drive shaft 54 and a universal joint 36. Further, when the auxiliary transmission mechanism 33 is mounted on the body frame 16, at the time of the mounting operation, the transmission V-belts 55, 55 as the wrapping transmission tools are driven by the driving pulley 37 and the driven pulley 3.
It will be wrapped around two. As shown in FIG. 4, in order to apply tension to the belts 55 in the wound state, a tension arm 56 is provided on the horizontal frame portion 16A so as to be swingable around the longitudinal axis Y3. The tension pulley 57 at the tip is elastically urged against the belts 55 and 55 by a spring 58 so as to be pressed against the belts 55 and 55. In addition, this spring 5
8 can be adjusted as shown in FIGS. 4 and 5.

[Brief description of the drawings]

FIG. 1 is a side view showing a tractor equipped with a mower.

FIG. 2 is a side view showing a tractor configured for front work.

FIG. 3 is a longitudinal sectional side view showing a main part.

FIG. 4 is a partially broken front view showing a main part.

FIG. 5 is a cross-sectional plan view showing a tension pulley and the like.

FIG. 6 is a longitudinal sectional front view showing a main part.

FIG. 7 is a cross-sectional plan view showing a main part.

FIG. 8 is a longitudinal sectional side view showing a locking portion.

FIG. 9 is a side view showing a state in which the auxiliary transmission mechanism is mounted (a) and a state in which the auxiliary transmission mechanism is mounted (b).

FIG. 10 is a perspective view showing an auxiliary transmission mechanism.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 front wheel 2 rear wheel 9 mid-mount type working device 14 transmission shaft 27 locking tool 32 driven rotating body 33 auxiliary transmission mechanism 37 drive rotating body 55 winding transmission tool

Claims (2)

[Claims] 1. A mid-mount type working device is detachably disposed between a front wheel and a rear wheel, and power is transmitted to the mid-mounted type working device from a rear side of a vehicle body via a transmission shaft, And, in a state where the mid-mount type working device is detached from the lower abdomen space of the vehicle body, an auxiliary transmission mechanism is provided so as to be detachably attached to the vehicle body, the power transmission shaft being interlocked and connected to transmit power forward of the lower body abdomen space. With
A work for winding around a wrapping transmission tool over a driving rotator provided at the front end of the auxiliary transmission mechanism and a driven rotator disposed above the driving rotator and on the vehicle body side, for working in conjunction with the driven rotator. A power take-out structure for a tractor that has a power take-out shaft extending forward of the vehicle body. 2. The auxiliary transmission mechanism according to claim 1, wherein the auxiliary transmission mechanism is configured to be engageable with a locking member for detachably mounting the mid-mount type working device to the lower abdominal space of the vehicle body. Tractor power take-out structure.