JPH0513109U - Connection structure of power transmission part in tractor - Google Patents

Abstract

(57) [Summary] [Purpose] To enable a power transmission unit to be connected with a simple structure in a tractor configured so that a working unit can be selectively connected to a normal connection position and an offset connection position. [Structure] A drive wheel 20 that is interlocked with a PTO shaft
In order to correspond to the position of the power input shaft 28 on the working unit side, the left and right are provided on the hitch frame via the guide rails 14 so as to be horizontally movable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for connecting a power transmission unit in a tractor in which a working unit such as a rotary is connected to a rear portion of a traveling machine body.

[0002]

[Problems to be Solved by Prior Art and Invention]

 Generally, in this type of tractor, a working unit such as a rotary is connected to a lifting link mechanism at the rear of the traveling body. By the way, in such a thing, in a normal state, the working part is connected at a normal connecting position where the left-right center line of the working part and the left-right center line of the traveling machine body are substantially aligned. However, when performing off-set work that dislikes the work unit from jumping out from the side edge of the traveling machine body, the working unit may be mounted in a biased state with respect to the traveling machine body in the lateral direction. The power input shaft on the part side is displaced to the left and right by the amount of deviation from the PTO shaft (power take-out shaft) on the traveling body side. Therefore, in the past, the power input shaft was provided so that it could be moved in the left-right direction so that it could be aligned with the PTO shaft. In this case, however, in the working unit, the gear unit linked to the power input shaft is moved in the left-right direction. Since it is necessary to make it movable, the structure of the gear case and the transmission mechanism from the gear to the rotor shaft must not be complicated, and the strength of the frame supporting the gear case must be measured. It was a problem.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 2-150204, an intermediate connecting wheel in which a power transmission shaft and a power input shaft are connected to a hitch frame provided at a rear portion of a traveling body for connecting a working portion. It has been proposed that the shaft can be freely swung in the left-right direction so that the offset connection can be made without moving the power input shaft on the working part side. However, since the intermediate connecting wheel swings to the left and right in this case, there are only two points where the intermediate wheels can be set at the same height, and when one point corresponds to the normal connecting position, the remaining Since only one point corresponds to the offset connection position and more offset connection positions can be set, the intermediate input wheel must be set in the vertical direction and the power input shaft must be moved to the working part. However, if there is a large offset width (deviation width), it is necessary to increase the length of the rocking arm provided with the intermediate connecting wheel. If this is not achieved, a new problem will occur in which the hitch frame will also become large, and further improvement is necessary.

[0004]

[Means for Solving the Problems]

 The present invention was devised with the object of providing a connecting structure for a power transmission section in a tractor that can eliminate these drawbacks in view of the above-mentioned circumstances, and it is provided at the rear part of the traveling machine body. On the hitch frame, select the normal connection position where the left and right centerline of the working part and the left and right centerline of the running body are approximately coincident with each other, and the offset connection position where the working part is biased to the left or right with respect to the running body. In the tractor configured to be selectively switched, the power transmission shaft connected to the PTO shaft of the traveling machine body and the power input shaft on the working unit side are connected in the left and right horizontal directions to the hitch frame. An intermediate connecting wheel is provided on the guide rail so as to be movable in the left-right direction. The intermediate connecting wheel is connected to the power transmission shaft and the power input shaft. The, usually connection position, and characterized by being configured to be movable in parallel toward the left and right horizontal Direction corresponds to offset coupling position.

According to the present invention, the intermediate connecting wheel provided on the hitch frame can be moved in parallel in the horizontal direction in the horizontal direction.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a tractor, and a rotary working unit 3 is detachably connected to a rear portion of the traveling machine body 1 through a lifting link mechanism 2. The rotary working unit 3 is Select the normal connection position where the left and right centerlines are substantially coincident with the left and right centerline of the traveling machine body 1 and the offset connection position where the rotary working unit 3 is biased to either the left or right position with respect to the traveling machine body 1. You can set it up. That is, the rear end portions of the top link 4 and the left and right lower links 5 that constitute the lifting link mechanism 2 are pivotally supported by the top bracket 7 and the left and right lower brackets 8, respectively. , 8 are integrally connected by a frame portion 9 having a substantially inverted U shape. Further, the top bracket 7 and the lower bracket 8 are respectively formed with hook portions 7a, 8a which are open toward the rear side, and thus the hitch frame to which the rotary working portion 3 can be connected to the rear portion of the machine. Has been formed.

On the other hand, in the rotary working part 3, an upper connecting pin 12 a is mounted via a bracket 12 mounted on the upper part of the gear case 10, and left and right mounted on a supporting frame 11 on which the gear case 10 is supported. The left and right lower connecting pins 13a are respectively provided through the brackets 13 of these, and these connecting pins 12a, 13a have two engaging portions on the left and right for engaging the hook portions 7a, 8a. ing. Then, for example, when the rotary working portion 3 is lifted with the right engaging portion of the upper connecting pin 12a engaged with the hook portion 7a of the top bracket 7, the right engaging portion of the lower connecting pin 13a is automatically moved. Is engaged with the hook portion 8a of the lower bracket 8, and when the left engaging portion of the upper connecting pin 12a is engaged with the hook portion 7a, the left engaging portion of the lower connecting pin 13a is engaged. Although the parts are adapted to engage with the hook parts 8a, in the present embodiment, when they are engaged with the engaging parts on the left side of the upper and lower connecting pins 12a and 13a when viewed from the front side of the machine body, the rotary parts are When the right and left center lines of the working unit 3 and the left and right center lines of the traveling machine body 1 are set to the normal connection position and the right side engaging portion is engaged, the rotary working unit 3 causes the traveling machine body 1 to move. Against And summer as excisional the offset coupling position shifted left by position X.

Further, a guide rail 14 formed of a pair of upper and lower pipe members is supported between the left and right leg portions 9a of the frame portion 9, and a clutch mechanism 15 described later is attached to the guide rail 14. A movable plate 16 is provided slidably in the horizontal direction, and one end of a stopper lever 17 is pivotally supported on the movable plate 16. Further, a guide plate 18 is fixed to one leg portion 9a of the frame portion 9, and a guide groove into which the other end side of the stopper lever 17 is fitted in the guide plate 18 so as to be movable in the left-right direction. The movable plate 16 is provided with a movable plate 16 which is horizontally moved by engaging the stopper lever 17 with stopper holes 18b and 18c formed at the end of the guide groove 18a. It is set to move to the position corresponding to the normal connection position and the offset connection position. Incidentally, in this embodiment, as shown in FIG. 6, when the stop lever 17 is locked in the right locking hole 18b, the movable plate 16 is located at the normal connecting position of the frame portion 9 substantially in the left-right direction. In addition, as shown in FIG. 7, when the stopper lever 17 is locked in the left locking hole 18c, the movable plate 16 is fixed at the offset connection position which is shifted to the left by the predetermined position X. It has become. Here, 19 is a spring supported between the lever 17 and the movable plate 16, and the biasing force of the spring 19 causes the lever 17 locked in the locking holes 18b and 18c to move carelessly. It's not happening.

Reference numeral 20 denotes a drive side wheel that constitutes the clutch mechanism 15 and corresponds to the intermediate connecting wheel of the present invention. The drive side wheel 20 includes the cap 21, the buffer 22, the bearing holder. It is elastically supported by the movable plate 16 via 23 and a bearing 24. Reference numeral 25 denotes a power transmission shaft having bendable joint parts (universal joints) 25a and 25b at both front and rear ends thereof, and the front joint part 25a is connected to a PTO shaft 26 on the side of the traveling body 1 in an interlocking manner. The rear joint portion 25b is fitted into the drive side wheel 22 with the C-shaped retaining ring 27 retained in the key groove while being engaged with the drive side wheel 22. The claw 20a is projected.

On the other hand, 28 is a power input shaft that projects forward from the gear case 10 of the rotary working part 3. The inner peripheral surface of a tubular sleeve 29 is spline-fitted to the outer peripheral surface of the power input shaft 28. The sleeve 29 has a guide projection 29a having a substantially conical tip at the front end thereof. Further, the inner peripheral surface of the driven wheel 30 is spline-fitted to the outer peripheral surface of the sleeve 29. The driven wheel 30 is always forwardly forwarded by an ammunition 31 for avoiding overload. A meshing claw 30a, which is biased and meshes with the meshing claw 20a of the drive side wheel 20, is provided in a protruding manner. Here, 31 is a C-shaped retaining ring, 32 is a flat washer, and 33 is a cover body. Then, the engaging claws 20a, 30a of the driving wheel 20 and the driven wheel 30 can be engaged with each other in a guide state in which the guide protrusion 29a is inserted into the guide hole 25c formed in the rear joint portion 25b. However, by connecting both wheels 20 and 30 in this way, the power input from the PTO shaft 26 is transmitted to the front joint portion 25a, the power transmission shaft 25, the rear joint portion 25b, and the driving side. It is adapted to be transmitted to the power input shaft 28 via the wheel 20, the driven wheel 30, and the sleeve 29. Further, the power input to the power input shaft 28 is transmitted to the drive shaft in the support frame 11 via the gear portion in the gear case 10 and then via the chain suspended in the side case 34. And is transmitted to the rotary shaft 35.

In the embodiment of the present invention configured as described above, when the rotary working unit 3 is attached to the traveling machine body 1, the hook portions 7a and 8a on the traveling machine body 1 side are connected to the connecting pins 12a on the rotary working unit 3 side. , 13a by selecting either of the left and right engaging portions to engage with each other, the normal connecting position where the left and right centerlines of the rotary working part 3 and the left and right centerline of the traveling machine body 1 substantially match, The rotary working unit 3 can be selectively set to a predetermined position X with respect to the traveling machine body 1 and an offset connection position which is offset to the left side. In this case, the PTO shaft 26 on the traveling machine body 1 side is connected to the joint portion. It is connected to the drive-side wheel 20 via a power transmission shaft 25 having 25a and 25b, and the drive-side wheel 20 is displaced to the left by a predetermined position X from the normal connection position in the substantially horizontal center position. It is mounted on a movable plate that is slidable in the horizontal direction at the offset connection position. Then, the movable plate 16 is fixed in advance to the normal connecting position or the offset connecting position in correspondence with the position of the rotary working unit 3 in advance, so that the traveling machine body 1 and the rotary working unit 3 are connected at the same time as driving. The meshing claw 20a of the side wheel 20 and the meshing claw 30a of the driven side wheel 30 connected to the input shaft 28 on the rotary working section 3 side mesh with each other to connect the wheels 22, 30 together, and P TO Power can be transmitted from the shaft 26 to the power input shaft 28.

As described above, according to the present invention, the rotary working unit 3 is connected to the normal connecting position where the center line of the left and right is substantially coincident with the traveling machine body 1 and the offset coupling which is offset to the traveling machine body 1 in the left-right direction. Although it can be selectively set to the position, in this case, the drive wheel 20 linked to the PTO shaft 26 on the traveling machine body 1 side and the driven wheel 20 linked to the input shaft 28 on the rotary working unit 3 side. The alignment with the side wheel 30 can be performed by horizontally moving the movable plate 16 on which the drive side wheel 20 is mounted. The drive side wheel 20 has the joint portions 25a and 25b at both front and rear ends. Since it is connected to the PTO shaft 26 via the power transmission shaft 25 provided with, the movable plate 16 to which the drive-side wheel 20 is attached can be moved in the left-right direction on the frame portion 9. A simple structure that requires only installation is sufficient, and as a result, the structure of the gear case and transmission mechanism may become complicated, as in the case where the conventional power input shaft on the side of the rotary working part is provided so as to be movable in the left-right direction. Absent.

Moreover, since the movable plate 16 provided with the drive-side wheel 20 is guided by the guide rails 14 in the horizontal horizontal direction, the drive-side wheel 20 is irrespective of the horizontal movement position thereof. Since it is always located at the same height with respect to the frame part 9, as a result, a plurality of offset connection positions are set in addition to the normal connection position (in the embodiment, there is one offset position, but there are two or three offset positions). However, the drive side wheel 20 can be set at the same height position with respect to the frame portion 9 at all of these set positions even if the height adjustment of the power input shaft 28 is performed. If the offset width is wide in the left / right direction, the left / right width will be widened accordingly, but the drive-side wheel 20 will be moved in the left / right direction via the swing arm. There is no need to provide a long swinging arm in the up-down direction as in the case where the hitch frame is freely swingable, and there is an advantage that it is possible to reliably avoid the hitch frame from becoming too large. Further, the frame portion 9 to which the movable plate 16 is attached is a member that is indispensable for attaching the rotary working portion 3, and also has sufficient strength to attach the movable plate 16, so that it also serves as a member. It is convenient that it can be made into a product.

[0014]

[Operation effect]

 In short, since the present invention is configured as described above, when attaching the working unit to the traveling machine body, the normal connecting position where the left and right centerlines of the working unit and the left and right centerlines of the traveling machine body are substantially aligned, The work part can be selectively set to an offset connection position that is offset to the left and right with respect to the traveling body. In this, the power transmission shaft connected to the PTO shaft on the traveling body side and the working part side are arranged. When connecting the power input shaft, the intermediate connecting wheel, which connects the power transmission shaft and the power input shaft, is provided on the hitch frame so as to be movable in the left-right direction, and is in the normal connection position or the offset connection position. It will be possible to move in parallel to the left and right in the horizontal direction. As a result, the power input shaft does not need to be provided on the working unit side so that it can move in the left-right direction, and unlike the case where the power input shaft is provided so as to be movable, the transmission mechanism from the gear case and the gear unit to the rotor shaft is eliminated. The structure does not become complicated, and there is no need to measure the strength up of the frame supporting the gear case, which contributes to simplification of the structure and weight reduction.

Moreover, since the intermediate connecting wheel is guided by the guide rail and moves in parallel in the left-right horizontal direction, the intermediate connecting wheel is always positioned at the same height with respect to the hitch frame regardless of the left-right movement position. Will be done. As a result, even if a plurality of offset connection positions are set in addition to the normal connection position, the intermediate connection wheels are located at the same height position in all of these set positions, which means that the work unit side is located. It is not permissible to adjust the height of the power input shaft, and if the offset width is wider in the left-right direction, the left-right width will be wider by that amount, but the intermediate connecting wheel can There is an advantage that it is not necessary to provide a long swinging arm in the up-down direction as in the case where the hitch frame is freely swingable, and it is possible to reliably prevent the hitch frame from becoming large or heavy. ..

[Brief description of drawings]

FIG. 1 is a side view of a rear portion of a tractor.

FIG. 2 is a plan view of the tractor in a normal connecting position.

FIG. 3 is a plan view of the tractor in the offset connection position.

FIG. 4 is a plan view of a connecting portion in a normal connecting position.

FIG. 5 is a plan view of the connecting portion at the offset connecting position.

FIG. 6 is a front view of a hitch frame portion in a normal connection position.

FIG. 7 is a front view of the hitch frame portion at the offset connection position.

FIG. 8 is a horizontal cross-sectional view of the connecting portion in the normal connecting position.

FIG. 9 is a horizontal sectional view of the connecting portion at the offset connecting position.

FIG. 10 is a vertical sectional view of a connecting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling machine 3 Rotary working part 9 Frame part 14 Guide rail 20 Drive side wheel 25 Power transmission shaft 26 PTO shaft 28 Power input shaft

Claims (1)

[Scope of utility model registration request] 1. A hitch frame disposed at a rear portion of the traveling machine body, a normal connecting position where the left and right centerlines of the working unit and the left and right centerlines of the traveling machine body are substantially aligned, and the working unit is located on either side of the traveling machine body. In a tractor constructed so that it can be selectively switched to an offset connection position which is biased to one side, the power transmission shaft connected to the PTO shaft of the traveling machine body and the power input shaft on the working unit side are connected. On the hitch frame, a guide rail that is oriented horizontally is provided.
An intermediate connecting wheel to which the power transmission shaft and the power input shaft are respectively connected is provided on the guide rail so as to be movable in the left-right direction, and the intermediate connecting wheel is moved in the horizontal direction corresponding to the normal connection position and the offset connection position. A structure for connecting a power transmission unit in a tractor, which is configured to be able to move in parallel toward the vehicle.