JP3477544B2 - Farm work machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a steering handle that can be turned from the rear right position of an airframe, such as tilling, soiling, ridges, grooving, and the like. The present invention relates to an agricultural work machine for performing agricultural work. 2. Description of the Related Art Conventionally, this kind of agricultural working machine has been disclosed in
As described in Japanese Patent Publication No. 25381 and as shown in FIG. 6, a reverse tilling control arm A which operates in conjunction with a shifter operation to a reverse speed of a traveling shift lever, and the reverse tilling control arm A are operated. A reverse tilling control link D connected to the base of the tilling clutch lever C in the device B, and a reverse traction control means for controlling the cultivation clutch lever C so as not to be a clutch "joint" in conjunction with the shifter operation to the reverse speed. Is known. [0003] In other words, when a work device B such as a rotary device is mounted on a hitch E on the rear side of the fuselage to perform work such as tilling, when the speed is changed to the reverse speed, the steering handle is provided from the rotary device mounted on the rear portion of the fuselage. Since there is a problem that the operator approaches the operator who operates the vehicle, the reverse braking control means is provided to disengage the clutch of the working device C in conjunction with the shifter operation to the reverse speed. [0004] However, in the above-described agricultural working machine, when the steering handle is turned from the rear right position of the body to the front reverse position, the shift stage at the rear normal position and the front position are shifted. Since the shift speed at the reverse position is reversed, for example, the forward speed at the forward reverse position becomes the reverse speed at the forward normal position,
For example, when performing a groove raising operation or the like by turning the steering handle to the front reverse position, when the traveling shift lever is shifted to the forward speed, the reverse tilling control arm A, the reverse tilling control link D, and the clutch lever C are connected via the reverse tilling control arm A and the reverse tilling control link D. Working device B
When the grooving operation or the like is performed, the operation of removing the reverse tilling control link D is required in advance, and the operation of the working device B cannot be performed. When the work such as tilling is performed by turning the directional handle to the rear right position, there is a problem that the work for attaching the backward tilling control link D is particularly necessary,
Further, there is a problem that the user may forget to attach the backward tilling control link D. The present invention provides an agricultural work machine capable of intercepting and joining a power transmission path interlocked with a shifter operation to a reverse speed only by turning a steering handle between a forward normal position and a forward reverse position. Its main purpose is to provide [0006] In order to achieve the above-mentioned main object, the present invention is directed to a first embodiment of the present invention, as shown in Figs. In the agricultural work machine provided with the device 6 and the steering handle 8 which can be turned from the rear normal position, when the steering handle 8 is in the rear normal position on the power transmission path of the working device 6, the shifter is moved to the reverse speed. A reverse braking mechanism 20 is provided to interrupt the power transmission path in conjunction with the operation and to connect the power transmission path when the steering handle 8 is turned. According to the first aspect of the present invention, as shown in FIG. 1, a reverse braking mechanism 20 is provided in the power transmission path of the working device 6, and the steering handle 8 is at the rear right position. Sometimes, the power transmission path is shut off in conjunction with the shifter operation to the reverse speed, and when the steering handle 8 is turned, the power transmission path is connected. Therefore, the steering handle 8 is set to the rear right position. Simply by turning, the power transmission path can be cut off in conjunction with the shifter operation to the reverse speed.
By simply turning the front to the reverse position, the power transmission path can be connected. Therefore, the troublesome work of attaching and detaching the link as in the related art can be eliminated, and the backward restraint can be surely performed. [0008] The agricultural working machine of the embodiment shown in FIG. 3 has an engine 2 mounted on the front upper part of a body 1 and
A transmission case 3 having a main shaft 31 and a PTO shaft 32 interlocked with a drive shaft of the engine 2 on a rear side of the body 1.
And an axle 33 is provided below the transmission case 3 via a power transmission mechanism interlocked with the rotation of the main shaft 31 to support the traveling wheels 4 on the axle 33 and to a rear end of the body 1. In the meantime, a rotary device 6 is detachably supported via a hitch 5, and a handle mounting base 7 is provided on the upper side of the transmission case 3, and a handle shaft (not shown) extending in a vertical direction is provided on the handle mounting base 7. A steering handle 8 extending obliquely upward toward the rear through the vehicle is rotatably attached to the body 1 at a rearward normal position and a forward reverse position, and the PTO is provided on one side of the transmission case 3. A transmission case 9 having a power transmission mechanism interlocked with the rotation of the shaft 32 is supported, and an input shaft 6 in a tilling case 61 of the rotary device 6 is provided via a power transmission mechanism in the transmission case 9. It is to drive the. In the transmission case 3, a forward high speed, a forward intermediate speed, a forward low speed,
A power transmission mechanism capable of shifting gears in four stages of reverse speed is installed, and a shift shaft 3 interlocked with operation of the travel shift lever 10 is provided.
4, the gear is switched to a predetermined gear position.
In addition, in the vicinity of the traveling shift lever 10 in the transmission case 3, the traveling shift lever 10 is guided to a predetermined switching position, and four shift stages (forward low speed) corresponding to each shift stage of the power transmission mechanism. A shift guide 1 having a substantially H-shaped guide hole to be held in one of a shift stage, a forward middle shift stage, a forward high shift stage, and a reverse shift stage.
1 is arranged. The traveling shift lever 10 is
It is rotatably supported by a support cylinder 13 rotatably mounted on the transmission case 3 via a mounting shaft 12 extending in a lateral direction from a position near the shift shaft 34, and turns the steering handle 8 to a front reverse position. At this time, the traveling shift lever 10 can also be turned forward with respect to the body 1. When the steering handle 8 is at the rear right position in the power transmission path of the working device 6 such as a rotary device in the agricultural work machine configured as described above, the power transmission path is interlocked with the shifter operation to the reverse speed. When the steering handlebar 8 is turned, the reverse braking mechanism 2 that takes over the power transmission path.
That is, 0 was provided. The reverse braking mechanism 20 of the embodiment shown in FIGS. 1 and 2 is provided with a reverse braking clutch 21 provided between the PTO shaft 32 and the input wheel 91 of the transmission case 9.
And a clutch lever 2 for turning on and off the clutch 21
2, an intermediate body 23 interposed between the clutch lever 22 and the shaft end of the shift shaft 34, and a swingably interposed between the intermediate body 23 and the steering handle 8, And a control body 24 for operating the intermediary body 23 following the turning of the handle 8. The intermediate body 23 is provided on one side of the transmission case 9 with a swing arm 231 swingably supported between an intermediate position facing the shift shaft 34 and a retracted position, and the swing arm 231. Of the shift shaft 34 at the intermediate position, and a pressing force for urging the operating body 232 outward (toward the shift shaft). A spring 233 and a biasing spring 234 that constantly biases the swing arm 231 toward the retracted position are provided. The operating body 232 is formed to have a length shorter than the entire length of the cylindrical portion 231a as shown in FIG. 1, and is provided at an intermediate portion of the operating body 231 at an end of the cylindrical portion 231a. Large-diameter portion 232a facing the direction collar 231b
Is provided, and is elastically held by the force of the pressing spring 233 to prevent inadvertent protrusion of the operating body 232 to the outside of the cylindrical portion 231a, and swings while holding the operating body 231 in this manner. The moving arm 231 can be swung between the intermediate position and the retracted position. The reverse braking control clutch 21 includes a slide body 211 slidably and spline-fitted on a shaft part of the PTO shaft 32 that protrudes into the transmission case 9, and a slide body 211 and the PTO shaft 32. On the other hand, a meshing concave and convex portion 212 provided on a surface facing the input wheel 91 freely rotatably supported, and a pressing spring 213 for urging the slide body 211 in a direction in which the meshing concave and convex portion 212 always mesh.
The clutch lever 22 having a substantially L-shaped cross section and having an engagement protrusion engaged with an annular engagement groove 211 a provided on the outer periphery of the slide body 211 is relatively rotatably held on the outer periphery of the slide body 211. When the position 23 is in the intermediate position, one end of the clutch lever 22 is opposed to the other end of the operating body 232. The end of the clutch lever 22 on the side of the operating body 232 does not protrude outward from the transmission case 9 as shown in FIG. 1 so as to prevent interference with the swing arm 231. Similarly, the shift shaft 34 is not protruded outwardly from the transmission case 3 as shown in FIG. 1 except when the shifter is operated at the reverse speed so as to prevent interference with the swing arm 231. ing. The control body 24 is swingably mounted on a bracket 25 mounted on the transmission case 3 via a pivot 26 so that the steering handle 8 is moved from the front reverse position to the rear normal position. At the time of turning, a contact upper surface 24a which abuts on the bottom of the steering handle 8 and swings the whole of the control body downward, and a contact which abuts on the tip end cylindrical portion of the swing body 231 to swing the swing body 231. When the steering handle 8 is turned from the reverse front position to the rear normal position, the swing body 231 is swung to the lower intermediate position, and the steering handle 8 is moved forward from the rear normal position. When turning to the reverse position, the contact of the bottom of the steering handle 8 with the contact upper surface 24a is released, and the control body 24 is retracted to the upper retract position together with the rocking body 231 by the force of the biasing spring 234. I have. Thus, when the steering handle 8 is at the rearward position with respect to the fuselage 1 as shown by the solid line in FIG.
The contact upper surface 24a of the control body 24 is
Of the control body 24 and the lower surface 24b of the controller 24.
Abuts on the distal end cylindrical portion 231a of the rocking body 231 and the intermediate body 23 is moved to the intermediate position. For this reason, when the shift operation is performed to the reverse speed by the moving operation of the travel shift lever 10 and the shift shaft 34 moves in the direction of the arrow in FIG. 1, the operating body 232 of the relay body 23 resists the pressing spring 233 by the shift shaft 34. Then, it is pressed in the direction of the arrow in FIG.
Further, the operating body 232 presses the clutch lever 22 in the direction of the arrow in FIG. 1, and the slide body 211 slides against the pressing spring 213 by the clutch lever 22, and as shown in FIG. 212 is disengaged and PTO
Power transmission from the shaft 32 to the input wheel 91 is cut off. Therefore, even if the shifter is operated at the reverse speed with the steering handle 8 at the rear right position, the drive of the working device 6 such as the rotary device can be stopped, and safety can be improved. When the steering handle 8 is turned from the normal rear position to the reverse front position as shown in FIG. 5, the contact of the control body 24 at the bottom of the steering handle 8 with the contact upper surface 24a is released. When the shift shaft 34 is not shifted to the reverse speed, the swinging member 231 can swing without interfering with the shift shaft 34 and the clutch lever 22 as shown in FIG. As shown in FIG. 5, the swinging body 231 and the control body 2
4 is retracted to the upper retract position, and each meshing concave and convex portion 212 of the reverse braking control clutch 21 is
13 maintains the meshing state. Therefore, when the steering handle 8 is turned to the front reverse position to perform a groove raising operation or the like, the traveling shift lever 10 is moved to the steering handle 8.
In the normal position, it is possible to switch to the shift stage that was the reverse shift stage, and the vehicle can travel forward. As described above, by merely turning the steering handle 8, the power transmission path of the working device 6 can be cut off at the normal position of the steering handle 8 in conjunction with the shifter operation to the reverse speed. The shifter can be operated at the forward speed at the reverse position of the steering handle 8. In FIG. 1, reference numeral 92 denotes a transmission chain which is hung on an input wheel 91 in the transmission case 9, and in FIG.
Reference numeral 3 denotes a clutch lever for a tilling clutch provided in the tilling case 61.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a cross section of only a part of a power transmission section of an agricultural working machine of the present invention. FIG. 2 is a partially longitudinal side view of the transmission case of FIG. 1 with the transmission case omitted; FIG. 3 is a side view of the whole agricultural work machine. FIG. 4 is an explanatory view showing an operation state of FIG. 1; FIG. 5 is an explanatory diagram showing an operation state of FIG. 2; FIG. 6 is an explanatory diagram of a conventional example. [Description of Signs] 1 ... Airframe 6 ... Working device 8 ... Steering handle 20 ... Backward restraint mechanism

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 60-163178 (JP, U) Japanese Utility Model Showa 58-168977 (JP, U) Japanese Utility Model Showa 58-5076 (JP, U) Japanese Utility Model Showa 57- 67880 (JP, U) JP-A 51-142507 (JP, U) JP 4-25381 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 51/06 111 A01B 33/08

Claims (1)

(57) [Claims 1] A working device (6) is provided at the rear of the body (1).
And a steering handle (8) that can be turned freely from the rear right position
When the steering handle (8) is in the rear right position in the power transmission path of the working device (6), the power transmission path is interlocked with the shifter operation to the reverse speed. An agricultural work machine comprising a reverse braking mechanism (20) for connecting a power transmission path when the steering handle (8) is turned.