JP3633768B2 - Working machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work machine such as a rice transplanter in which a shift lever is linked to a belt-type continuously variable transmission through a link mechanism.
[0002]
[Prior art]
Conventionally, the continuously variable transmission and the shift lever are interlocked via a link mechanism without play.
[0003]
[Problems to be solved by the invention]
However, according to the above conventional technique, since a large operating resistance by the continuously variable transmission acts on the transmission lever from the start of operation of the transmission lever, it is difficult to operate the transmission lever and the operation feeling is poor.
[0004]
In addition, when the driving load of the continuously variable transmission increases, the continuously variable transmission cannot be expected to absorb the load due to the shift lever being fixed by the shift lever, and an excessive force acts on the belt and pulley. There is a risk of causing such deformation and breakage.
[0005]
An object of the present invention is to improve the operational feeling of a speed change operation and to absorb a driving load by a continuously variable transmission.
[0006]
[Means for Solving the Problems]
The features, actions, and effects of the first invention according to claim 1 are as follows.
[0007]
〔Characteristic〕
A work machine in which a shift lever is linked to a belt-type continuously variable transmission via a link mechanism, between the continuously variable transmission and the link mechanism, or in the link mechanism or between the link mechanism and the shift lever. to impart an adjusting means for adjusting the interlocking positional relation between the operating shaft for operating the movable pulley member of the continuously said shift lever and said continuously variable transmission, the resistance to relative displacement between the continuously variable transmission and the transmission lever elastic And a rod member on the side of the continuously variable transmission, the operating lever, or the link mechanism, and a rod member for allowing relative displacement in the direction of transmission of the operating force between the continuously variable transmission and the transmission lever through the body. A cylindrical body that is movably fitted to the member, an elastic body that is fitted to the rod member on both sides of the cylindrical body, and the cylindrical body via the elastic body outside both elastic bodies. Adjusting the holding position The adjusting member includes a member and the continuously variable transmission linked to the cylindrical body, an operation lever, or a linkage member on the link mechanism side, and adjusts the holding position of the cylindrical body via the elastic body Thus, the adjusting means is configured, and the accommodating means is configured by a displacement-allowing portion of the cylindrical body between the cylindrical body and the adjusting member interposed with the elastic body .
[0008]
[Action]
According to the first aspect of the invention, when the speed change lever is operated, the operating force of the speed change lever is transmitted to the continuously variable transmission in a state in which the elastic body is elastically deformed. The state in which the continuously variable transmission is in response to the operation of the shift lever by gradually increasing the operation resistance by the elastic restoring force of the elastic body and transmitting the operation force of the shift lever to the continuously variable transmission while being reduced by the elastic deformation of the elastic body Can be operated.
[0009]
Moreover, as it were from the continuously variable transmission it is so as to permit the shifting operation of the continuously variable transmission by elastically held via an elastic member that is elastically deformed elastic member to a predetermined operating state, stepless When the drive load applied to the apparatus increases, the load applied to the pulleys, the belts, and the like, that is, an unreasonable force can be reduced by permitting the operation of the continuously variable transmission by absorbing the load and absorbing the load.
And the adjustment means which adjusts the interlocking positional relationship of the speed change lever and the operating shaft which operates the movable pulley body of a continuously variable transmission is provided, and the linkage member between a speed change lever and a continuously variable transmission is provided between this adjustment means. The rod member includes a cylindrical body linked to the linkage member and an elastic body that provides resistance to the relative displacement between the continuously variable transmission and the transmission lever between the adjustment means on both sides of the cylindrical body. Formed in an inserted state, and forming a flexible means for allowing relative displacement in the direction of transmission of the operating force between the continuously variable transmission and the speed change lever by the displacement allowable portion of the cylindrical body linked to the linking member via the elastic body Then , the shift lever and the movable pulley body are provided in a state where the movement of the cylindrical body is restricted by the resistance by the elastic body by adjusting the interlocking positional relationship between the shift lever and the operation shaft by the adjusting means. Pulley belt Times the radius can be adjusted relationship with, because it adjusts the belt winding radius of the relationship of the pulley, the relationship between the shift lever and the movable pulley member can be adjusted to a proper state.
[0010]
〔effect〕
Therefore, according to the first aspect of the present invention, at the time of a shift operation, rather than giving a large operation resistance from the initial stage of the shift operation, the operation resistance is gradually increased so as to suppress the uncomfortable feeling of the shift operation and improve the operation feeling. In addition, the continuously variable transmission can be prevented from being deformed or damaged due to an increase in driving load.
In addition, the continuously variable transmission can be operated in a shift state corresponding to the operation position of the shift lever.
[0011]
The features, functions, and effects of the second invention according to claim 2 are as follows.
[0012]
〔Characteristic〕
In the above first aspect of the present invention, the continuously variable transmission includes an input pulley comprising a split pulley that changes a belt winding radius by moving a movable pulley body along a pulley axis with respect to a fixed pulley body; An output pulley is provided, a transmission belt is wound around the input pulley and the output pulley, and the first operation shaft linked to the link mechanism is positioned along the axis of the link mechanism in a state of being parallel to the pulley axis. The arm is attached to the first operating shaft in an axially positioned state and in a non-rotating state, and the second operating shaft parallel to the pulley shaft core is attached to the arm in an axially positioned state. As the first operating shaft moves in one direction, the first shift fork that moves integrally with the first operating shaft and moves one movable pulley body to the belt winding radius increasing side is first. Attached to the work shaft so as to be rotatable around its axis, the other movable pulley body moves to the belt winding radius increasing side by moving together with the second operating shaft as the first operating shaft moves in the opposite direction. The second shift fork is provided on the second operating shaft so as to be rotatable around its axis.
[0013]
[Action]
According to the second aspect of the present invention, the arm having the second operation shaft attached in the axial direction positioning state is rotated in the axial direction positioning state and the first operation shaft attached to the fixed portion so as to be movable along the axis. Since it is attached in the stopped state, not only the second operating shaft can be moved along the axis along with the first operating shaft, but also around the first operating shaft axis relative to the fixed portion of the second operating shaft. Can be fixed.
[0014]
In addition, as the first operating shaft moves in one direction, the first shift fork that moves integrally with the first operating shaft and moves one movable pulley body to the belt winding radius increasing side is used as the first operating shaft. A second shift that is rotatably mounted around the shaft core and moves integrally with the second operation shaft as the first operation shaft moves in the opposite direction to move the other movable pulley body to the belt winding radius increasing side. Since the fork is attached to the second operation shaft so as to be rotatable around its axis, the shaft between the input pulley and the output pulley caused by engine vibration or the like is caused by the swing of the first shift fork and the second shift fork. It is possible to reliably maintain the engagement of the first shift fork and the second shift fork to the movable pulley body by allowing the distance variation.
[0015]
〔effect〕
Therefore, according to the second aspect of the invention, the second operating shaft can be reliably positioned with respect to the first operating shaft, and the first shift fork and the first Due to the synergy with the fact that the two-shift fork can be reliably applied to the movable pulley body, it has become possible to reliably shift regardless of engine vibration or the like.
[0016]
The features, actions, and effects of the third aspect of the present invention according to claim 3 are as follows.
[0017]
〔Characteristic〕
In the second aspect of the present invention, in addition to the adjusting means for adjusting the interlocking positional relationship between the shift lever and the operation shaft for operating the movable pulley body of the continuously variable transmission, a second shift with respect to the second operation shaft is performed. The second adjustment means for adjusting the axial position of the fork is provided.
[0018]
[Action]
According to the third aspect of the invention, the shift lever and the first shift fork are adjusted by adjusting the interlocking positional relationship between the shift lever and the operating shaft (first operating shaft) by the adjusting means (first adjusting means) according to the first invention. , That is, the relationship between the belt winding radius of the input pulley or the output pulley provided with one movable pulley body, and the second shift with respect to the second operating shaft, that is, the first operating shaft by the second adjusting means. By adjusting the axial center position of the fork, the axial center position of the second shift fork relative to the first shift fork can be adjusted to adjust the belt winding radius relationship between the input pulley and the output pulley. The belt winding radius of the input pulley can be adjusted to the maximum setting value and the belt winding radius of the output pulley can be adjusted to the minimum setting value when the lever is at the maximum speed position. It is possible to adjust the tripartite relationship between the lever and the input pulley and the output pulley to a proper state.
[0019]
〔effect〕
Therefore, according to the third aspect of the invention, the continuously variable transmission can be operated in a shift state corresponding to the operation position of the shift lever regardless of manufacturing tolerances, assembly tolerances, and the like.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, a riding type rice transplanter, which is an example of a working machine, is connected to a rear part of a riding type self-propelled machine 1 through a link mechanism 2 and a hydraulic cylinder 3 so that the seedling planting device 4 can be moved up and down. Configured.
[0021]
The self-propelled airframe 1 is configured by mounting an engine 8 and a boarding operation unit 9 on a body frame 7 having a pair of left and right driving front wheels 5 and a pair of left and right driving rear wheels 6. The driving front wheel 5 is supported on the body frame 7 via a planting / traveling mission case 10, and the driving rear wheel 6 is supported on the body frame 7 via an axle case 11. The engine 8 is supported in an anti-vibration manner on the body frame 7 including the mission case 10.
[0022]
As shown in FIG. 2, power is transmitted from the output shaft 8 a of the engine 8 to the input shaft 10 a of the mission case 10 via a belt-type continuously variable transmission 12.
[0023]
As shown in FIG. 3, the continuously variable transmission 12 has the input pulley 12A attached to the output shaft 8a in a non-rotating state and the output pulley 12B attached to the input shaft 10a in a non-rotating state. The transmission belt 12C is wound around the output pulley 12B and has a basic structure provided with a tension pulley 12D that applies tension to the transmission belt 12C. The input pulley 12A and the output pulley 12B are configured to change the belt winding radius by moving the movable pulley body 12b to and from the fixed pulley body 12a provided in a fixed position in the axial direction along the pulley axis. It consists of a pulley. That is, while the belt winding radius of the input pulley 12A is increased, the belt winding radius of the output pulley 12B is decreased to operate on the high speed side, while the belt winding radius of the input pulley 12A is decreased. By increasing the belt winding radius of the output pulley 12B, the output pulley 12B operates on the low speed side. The fixed pulley body 12a and the movable pulley body 12b of the input pulley 12A are arranged in a state in which the movable pulley body 12b is positioned on the engine 8 side (inside), and the fixed pulley body 12a and the movable pulley of the output pulley 12B. The body 12b is disposed in a state in which the movable pulley body 12b is positioned outside.
[0024]
As shown in FIG. 4, a first operation shaft 12E parallel to the pulley shaft core is movable along the shaft core in a steering gear case 13 which is an example of a fixed portion provided continuously to the upper portion of the transmission case 10. The arm 12F is attached to the first operating shaft 12E in the axial center positioning state and in a non-rotating state, and the second operating shaft 12G parallel to the pulley shaft core is rotated in the axial center direction positioning state on the arm 12F. Attached in a stopped state, the movable pulley body 12b of the input pulley 12A resists belt tension by moving integrally with the first operating shaft 12E as the first operating shaft 12E moves in one direction (outward). The movable pulley body 12b moves to the belt winding radius increasing side and moves integrally with the first operation shaft 12E along with the movement in the opposite direction (inward) of the first operation shaft 12E. A first shift fork 12H that allows movement toward the belt winding radius decreasing side due to belt tension is attached to the first operating shaft 12E so as to be rotatable around its axis, and a second operating shaft that is integral with the first operating shaft 12E. Along with the movement in the opposite direction (inward) of 12G, the movable pulley body 12b of the output pulley 12B moves integrally with the second operation shaft 12G to move the belt winding radius increase side, and the second operation shaft 12G The second shift fork 12J that moves integrally with the second operating shaft 12G along with the movement in one direction (outward) and allows the movable pulley body 12b to move toward the belt winding radius decreasing side due to the belt tension is provided in the second shift fork 12J. The continuously variable transmission 12 is configured by being attached to the two operation shafts 12G so as to be rotatable around the axis thereof. That is, the movement of the first operating shaft 12E and the second operating shaft 12G in one direction increases the belt winding radius of the input pulley 12A, while decreasing the belt winding radius of the output pulley 12B to operate on the high speed side. Further, the movement of the first operation shaft 12E and the second operation shaft 12G in the opposite direction reduces the belt winding radius of the input pulley 12A, while increasing the belt winding radius of the output pulley 12B to operate on the low speed side. It is supposed to be.
The means for preventing the arm 12F from rotating with respect to the first operating shaft 12E is a means using the key 14.
[0025]
The boarding driver 9 includes a steering wheel 15, a driver seat 16, and a transmission lever 17.
[0026]
As shown in FIGS. 2 to 4, the speed change lever 17 is linked to the first operating shaft 12 </ b> E via a link mechanism 18 so as to shift the continuously variable transmission 12 in accordance with its swing. The detent mechanism 19 is configured to be able to hold positions at a plurality of operation positions in a state in which artificial operation is allowed.
[0027]
The link mechanism 18 is provided with a bell crank 18B that is linked to the speed change lever 17 via the first rod 18A so as to swing about the left-right axis P1 as the speed change lever 17 swings. An interlocking shaft 18D interlocking with the bell crank 18B is provided via the second rod 18C so as to swing around the vertical axis P2 in accordance with the swinging, and the first operating shaft 12E is connected to the upper end of the interlocking shaft 18D. The operating arm 18E for moving the first operating shaft 12E is fixed by swinging integrally with the interlocking shaft 18D while being engaged with the attached interlocking pin 12e, and as the shift lever 17 swings to the high speed side. The first operating shaft 12E is moved in one direction, that is, on the high speed side, and the first operating shaft 12E is moved in the opposite direction, that is, on the low speed side as the shift lever 17 swings toward the low speed side. It is configured.
[0028]
In the link mechanism 18, more specifically, between the bell crank 18B and the second rod 18C, the transmission lever 17 and the continuously variable transmission 12, that is, the first operation shaft 12E in the direction in which the operation force is transmitted. An accommodation means for allowing relative displacement is provided, an elastic body 20 that provides resistance to the relative displacement between the first operation shaft 12E and the transmission lever 17, and an interlocking positional relationship between the transmission lever 17 and the first operation shaft 12E. And a second adjusting means for adjusting the axial position of the second shift fork 12J relative to the second operating shaft 12G.
[0029]
As shown in FIG. 5, the accommodation means is configured to pivotally connect a cylindrical body 21 through which the second rod 18 </ b> C is slidably inserted in the longitudinal direction thereof to the bell crank 18 </ b> B, and to connect the second rod 18 </ b> C to the cylindrical body 21. A pair of stopper nuts 22 for restricting the sliding range of the second rod 18C are screwed and mounted, and a lock nut 23 for fixing the stopper nut 22 to the second rod 18C is provided, and the cylindrical body 21 and the second rod It is configured to allow relative displacement between the speed change lever 17 and the continuously variable transmission 12 by sliding relative to 18C, and the fixing position of the stopper nut 22 with respect to the second rod 18C is changed in the longitudinal direction of the second rod 18C. By doing so, the relative slide range is changed.
[0030]
As shown in detail in FIG. 5, the elastic body 20 is in a state in which the second rod 18C is used as a spring guide and is compressed with the movement of the cylindrical body 21 toward the high speed side. A compression coil spring interposed between one end surface of the cylindrical body 21 and a state in which the second rod 18C is similarly used as a spring guide and compressed as the cylindrical body 21 moves toward the low speed side. A compression coil spring interposed between the other stopper nut 22 and the other end surface of the cylindrical body 21, and these compression coil springs 20 have a predetermined initial compression force by adjusting the distance between the stopper nuts 22. And both stopper nuts 22 and the cylindrical body so that the cylindrical body 21 is located in the center between the stopper nuts 22 in a state where the link mechanism 18 is stationary. It is intended for applying a compressive force to one and. Note that the stopper nut 22 acts on the compression coil spring 20 via a seat hook 22a.
[0031]
As shown in FIG. 5, the first adjusting means includes the stopper nut 22 and the lock nut 23, and the stopper nut 22 is arranged in the longitudinal direction of the rod with respect to the second rod 18C while maintaining the distance between the stopper nuts 22. By changing the position in the direction, the position of the first operating shaft 12E when the speed change lever 17 is located at a predetermined position (for example, the highest speed position), that is, the belt winding radius of the input pulley 12A is adjusted. ing.
[0032]
As shown in FIGS. 3 and 4, the second adjusting means is screwed into the second operating shaft 12G and comes into contact with the second shift fork 12J from the outside, thereby causing the movable pulley body 12b due to belt tension. An adjustment nut 24 that holds the position of the second shift fork 12J against a moving force toward the belt winding radius decreasing side that acts on the belt and a lock nut 25 for fixing the adjustment nut 24 are provided. The position of the second shift fork 12J relative to the second operating shaft 12G is changed by changing the position in the axial direction relative to the second operating shaft 12G.
[0033]
According to the above configuration, the interlocking relationship between the speed change lever 17 and the continuously variable transmission 12 can be adjusted by operating the first adjustment means and the second adjustment means, and the adjustment procedure will be described.
(1) The distance from the edge part of the 2nd rod 18C of both stopper nuts 22 is set to a reference value.
(2) The engine 8 is started, the shift lever 17 is operated to the highest speed position, and the engine 8 is stopped.
(3) The belt winding radius of the input pulley 12A, that is, the amount of the transmission belt 12C outer peripheral surface entering from the outer periphery of the input pulley 12A inward in the radial direction (ride out) is measured.
(4) When the ride-out is not a set value, the first adjusting means is operated to adjust the interlocking positional relationship between the speed change lever 17 and the first operating shaft 12E, that is, the movable pulley body 12b of the input pulley 12A.
(5) The operations (2) to (4) are performed until the rideout reaches a set value.
(6) When the ride-out reaches the set value, the second adjusting means is operated to adjust the ride-out on the output pulley 12B side to the set value.
[0034]
[Another embodiment]
In the above embodiment, the movable pulley body 12b of the input pulley 12A is operated by the first shift fork 12H, and the movable pulley body 12b of the output pulley 12B is operated by the second shift fork 12J. The movable pulley body 12b of the output pulley 12B may be operated by 12H, and the movable pulley body 12b of the input pulley 12A may be operated by the second shift fork 12J.
[0035]
In the above embodiment, the continuously variable transmission 12 has a type in which both the input pulley 12A and the output pulley 12B are split pulleys. However, the continuously variable transmission 12 includes an input pulley 12A and an output pulley 12B. Any one of them may be a split pulley.
[0036]
In the above embodiment, the accommodation means that allows relative displacement between the speed change lever 17 and the continuously variable transmission 12 by the relative movement of the cylindrical body 21 and the second rod 18C in the rod longitudinal direction has been shown. The accommodation means may be composed of a long hole and a connecting pin movably engaged therewith.
[0037]
In the above embodiment, the accommodation means is provided in the link mechanism 18. However, the accommodation means may be provided between the transmission lever 17 and the link mechanism 18 or between the link mechanism 18 and the continuously variable transmission 12. .
[0038]
The structure and form of the link mechanism 18 can be changed as appropriate.
[0039]
In the said embodiment, although the example of application to a riding type rice transplanter was shown, this invention is applicable to various working machines, such as a tractor.
[Brief description of the drawings]
FIG. 1 is a side view of a riding type rice transplanter. FIG. 2 is a side view of a continuously variable transmission and an operating device thereof. FIG. 3 is a cutaway rear view of the continuously variable transmission. FIG. 5 is a longitudinal sectional view of the accommodation means.
12 continuously variable transmission 12a fixed pulley body 12b movable pulley body 12A input pulley 12B output pulley 12C transmission belt 12E first operation shaft 12F arm 12G second operation shaft 12H first shift fork 12J second shift fork 13 fixing portion 17 shift lever 18 Link mechanism 20 Elastic body

Claims (3)

A working machine having a transmission lever (17) linked to a belt-type continuously variable transmission (12) via a link mechanism (18), the continuously variable transmission (12), the link mechanism (18), Between the link mechanism (18) or between the link mechanism (18) and the transmission lever (17), the movable lever body (12b) of the transmission lever (17) and the continuously variable transmission (12) is operated. stepless via an adjusting means for adjusting the interlocking positional relation between the operating shaft (12E), continuously variable transmission (12) and the elastic member for imparting a resistance to the relative displacement of the shift lever (17) and (20) to An interchangeable means for allowing relative displacement in the operating force transmission direction between the transmission (12) and the transmission lever (17) is provided, and the continuously variable transmission (12), the operation lever (17), or the link mechanism (18). ) Side rod member (18C) A cylindrical body (21) that is movably fitted to the cylindrical member (18C), an elastic body (20) that is fitted to the rod member (18C) on both sides of the cylindrical body (21), An adjustment member (22) (23) for adjusting the holding position of the cylindrical body (21) via the elastic body (20) on the outside of the elastic body (20) and the cylindrical body (21). The continuously variable transmission (12), the operating lever (17), or the linkage member (18B) on the link mechanism (18) side, and the cylindrical body (21) via the elastic body (20). The adjusting member is configured by the adjusting members (22) and (23) for adjusting the holding position, and a cylindrical shape between the cylindrical body (21) and the adjusting member (22) interposed with the elastic body (20). working machine, characterized in that the displacement permissive sites of the body (21) are constituted flexibility means As the continuously variable transmission (12), an input pulley comprising a split pulley that changes the belt winding radius by moving the movable pulley body (12b) along the pulley axis with respect to the fixed pulley body (12a). 12A) and an output pulley (12B), the transmission belt (12C) is wound around the input pulley (12A) and the output pulley (12B), and the link mechanism (18 The first operating shaft (12E) linked to the first operating shaft (12E) is attached to the fixed portion (13) so as to be movable along the axis of the first operating shaft (12E). A second operation shaft (12G) parallel to the pulley shaft core is attached to the arm (12F) in a state of axial center positioning, and the arm (12F) is attached to the arm (12F). The first shift fork (12H) that moves integrally with the first operation shaft (12E) along with the movement in the direction and moves one movable pulley body (12b) to the belt winding radius increasing side is moved to the first operation shaft. (12E) is rotatably attached around its axis, and moves with the second operating shaft (12G) together with the movement of the first operating shaft (12E) in the opposite direction to move the other movable pulley body (12b). The working machine according to claim 1, wherein a second shift fork (12J) for moving the belt to the belt winding radius increasing side is attached to the second operating shaft (12G) so as to be rotatable about its axis. In addition to the adjusting means (22) (23) according to claim 1, the second adjusting means (24) (25) for adjusting the axial position of the second shift fork (12J) with respect to the second operating shaft (12G). The working machine according to claim 2 provided.

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