JPS6232106Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an operating lever device for a tractor, etc., which prevents vibration of the operating lever as much as possible, and
The object of the present invention is to enable easy assembly of an operating lever and its guide in a predetermined positional relationship.

For example, in a tractor, a cover body consisting of a floor sheet that covers the lower part of the seat and a pair of fenders fixed to both sides of the floor sheet is provided on the vehicle body with a vibration isolating material such as rubber interposed therebetween. Some tractors are equipped with a gear shift lever guide on the body, and this type of tractor has the advantage that the cover body, the guide, and the seat provided on the floor seat hardly vibrate. However, in the above-mentioned conventional tractor, since the gear shift lever is supported on the vehicle body side, there is a problem that the vibration of the vehicle body is propagated to the gear shift lever, causing the gear shift lever to vibrate considerably. As described above, there is a problem in that the shift lever and the guide cannot be easily assembled in a predetermined positional relationship.

The present invention has solved the above problem, and its characteristics are that a cover body is provided on the vehicle body via a vibration isolating material, the cover body covers the upper part of the vehicle body, and the seat is arranged above. a pair of fenders fixed to the left and right sides of the floor sheet, and a guide for the operating lever is provided on one left and right side of the cover body, the above-mentioned one of the floor sheets A support member is disposed below the side, and the right and left sides of the support member are fixed to the lower surface of the floor sheet and the inner surface of the fender, respectively, and support shafts are provided across and supported on the left and right sides of these support members. , the operating lever is provided on the support shaft so as to be rotatable around the axis of the support shaft, and the operating lever is interlocked and connected to the transmission on the vehicle body side via an interlocking mechanism.

Hereinafter, a comparative example of the present invention will be explained based on the drawings of Figs. A hydraulic device 35 for lifting and lowering the work machine is mounted, and a pair of steps 36 are provided on both sides of the middle part in the longitudinal direction as follows. That is, the lower stay 37 extends outward from the mission case 1, and its tip end is inclined with the outer side rising. Further, an upper stay 38 is provided below the step 36, and the tip of the upper stay 38 faces the tip of the lower stay 37 in an inclined shape corresponding to the tip. A vibration isolating material 39 such as a rubber material and a seat ring 40 are interposed between the tips of the upper and lower stays 38 and 37, and a vibration isolating material 39 is provided below the tips of the lower stay 37 in the same manner as described above. , a seat ring 40 is arranged and fastened with bolts 41 and nuts 42, whereby the step 36 is provided to the mission case 1 via the vibration isolating material 39. 43 is a rear axle case, and 44 is a rear wheel. 45 is a cover body,
It consists of a floor sheet 47 that covers the lower part of the seat 46, and a pair of fenders 48 fixed to both sides of the floor sheet 47 and the step 36. The floor sheet 47 has a front rising portion 4 fixed to the step 36 in an upright manner and straddling the mission case 1.
9. A seat installation part 50 which is connected to the upper end of the front rising part 49 in a rear rising slope and has the seat 46 in the middle part in the width direction, and a rear rising part 51 which is arranged upright from the rear end of the mounting part 50. Consists of. A mounting member 5 is installed on the lower surface of the boundary between the installation part 50 and the rear rising part 51.
2 is disposed laterally, and the mounting member 52 is attached to the rear part of the hydraulic device 35 via a vibration isolating material 53 such as rubber, bolts 54, etc., and thereby the cover body 45
are provided on the vehicle body T via vibration isolators 39 and 53. A cover 82 covers the upper part of the front side of the cover body 45 of the mission case 1.

A speed change operation mechanism (not shown) is provided in the mission case 1, and a traveling system transmission device is provided in this mechanism. This traveling transmission consists of a main transmission that converts the power from the engine to, for example, 4th speed and back, an auxiliary transmission that further converts the power after the main shifting to 2nd speed, and a 2nd speed creep that changes to ultra-low speed. It consists of a transmission. Each speed change is performed by appropriately selecting a gear train. This selection is made by selectively switching a shift means such as a shifter or a shift fork, and a predetermined gear train is configured. The shift means is operated by means of a lever, a link mechanism, or the like.

Reference numeral 2 designates the composite speed change operation transmission device, which is composed of a cam mechanism, and is capable of operating the sub-transmission device (first speed change operation transmission mechanism) and the creep transmission device (second speed change operation transmission mechanism) at the same time.

The speed change operation transmission device 2 has a mounting plate 4 fixed to the side surface of the transmission case 1 with bolts 3, and a main shaft 5 projecting outwardly is rotatably supported on the mounting plate 4. A second interlocking bar 6 on the driven side is fixed to the outer end of the main shaft 5. A flange 7 is fixed to the main shaft 5, and a cam disk 8 is attached to the flange 7 with bolts 9. Cam grooves 10 and 11 are provided at two locations on the end surface of the cam disk 8, and the cam grooves 10 and 11 have irregularities in the radial direction and are provided over a predetermined length in the circumferential direction.

One of the cam grooves 10 is for sub-shift operation, and is formed in an arc concentric with the main shaft 5 from point a to point b in the figure, and oriented toward the center from point b to point c. The area from point to point d is formed into an arc concentric with the main axis 5. The other cam groove 11 is for creep speed change operation, and is oriented radially outward from point a' to point b', oriented toward the center from point b' to point c', and oriented radially outward from point a' to point b', and oriented toward the center from point b' to point c'. The area from point ' to point d' is formed into a mountain shape with the same height so as to point in the radial direction.

The central angles between a-b and a'-b' are the same, and similarly between b-c and b'-c', and between c-d and c'-
The central angles between d′ are formed to be equal.

Reference numeral 12 denotes a first arm for interlocking the auxiliary speed change, and the arm 12 is rotatably attached to the mounting plate 4 via a support shaft 13. The support shaft 13 and the arm 12 are fixed to rotate together. This arm 12
A cam floor 14 or a pin is provided at the tip of the cam floor 14 or a pin,
The cam floor 14 fits into the cam groove 10.
A second arm 15 for interlocking the auxiliary transmission is fixed to the other end of the support shaft 13, and a auxiliary transmission operation link 16 is rotatably connected to the arm 15. It is interlocked and connected to the protrusion 17 of.

18 is a first arm for interlocking creep speed change;
The arm 18 is also rotatably supported on the mounting plate 4 via a support shaft 19, and a cam floor 20 provided at the tip of the arm 18 is fitted into a creep shift cam groove 11. A second arm 21 for creep speed change interlocking is also fixed to the end of this support shaft 19.
A creep shift operation link 22 is connected to 1,
The link 22 is operatively connected to a protrusion 23 of a shift means of the creep transmission.

The positional relationship between the first arm 12 for interlocking the sub-shift and the first arm 18 for interlocking the creep shift is based on the cam disk 8.
The cam floors 14 and 20 are located at points a and a' at predetermined positions.

A positioning and fixing means 24 is provided on the outer periphery of the cam disk 8. The means 24 is a cam disk 8
A recess 25A is formed in the circumferential direction on the arcuate outer circumferential surface 25 of the cam disk 8, the rotation axis of the cam disk 8, that is, the lateral axis and the circular center circle, and the positioning portion 26 corresponding to each shift position is formed in the recess 25A. In the example, four notched recesses are arranged in a row at predetermined intervals, and the ratchet parts 27 are removably engaged with the positioning part 26. ,
It is equal to the central angle between c and d. The ratchet portion 27 includes a positioning arm 28 rotatably supported on the mounting plate 4, a ratchet pin 29 protruding from the tip of the arm 28, and a positioning arm 29 for pressing the pin 29 against the positioning portion 26 of the cam disk 8. It consists of a spring 30 that biases the arm 28.

A cover 31 is made of synthetic resin and integrally molded into a bowl shape, and is fitted onto the outer periphery of the mounting plate 4 to cover the cam disc 8. Here, the cover 31 and the mounting plate 4 constitute a case on the fixed side. are doing. A seal hole 32 for penetrating the main shaft 6 is provided in the center of the cover 31, and the inner circumferential surface of the seal hole 32 is formed to have a tapered cross section so as to slide on the main shaft 5 and exert a sealing action.

In this case, by rotating the second interlocking lever 6 in the X direction shown in the figure, the cam floor 14 of the first arm 12 for sub-shift interlocking, which is fitted in the point a of one of the cam grooves 10, moves to the point b. , the first arm 1 for creep gear shift interlocking is fitted into the other cam groove 11a' point.
The cam floor 20 of No. 8 moves to point b'. Since the distance between a and b of the cam groove 10 is a circular arc, the first arm 12 for auxiliary gear shift interlocking maintains a constant position without swinging depending on the rotation of the cam disc 8, but One arm 18 swings in the Z direction in the drawing along the cam groove 11, and operates a creep shift shifter means via a link mechanism 22 to perform a shift operation. This shift position is ensured by the pin 29 re-engaging with the positioning portion 26.

By further rotating the cam disc 8, the first arm 12 for interlocking the sub-transmission swings in the Y direction shown in the figure between the cam grooves 10b and 10c, and connects the sub-transmission via the connecting arm 15 and the link 16. Along with operating
The first arm 18 for interlocking the creep speed change has the cam groove 11
It swings in the Z direction between b' and c' and returns to its original position. Between cam grooves 10c-d and cam grooves 11c'-
The swinging motion of each arm 15, 18 between d' is the same, and the positioning is also the same, and the engagement biasing force of the spring (bullet) 30 acts radially inward from the outer peripheral surface of the cam disc 8. Since the cam disk 8
There is no collapse.

Therefore, by rotating the single second interlocking lever 6, the sub-shift and the creep shift are simultaneously interlocked, thereby improving operability and reducing the number of second interlocking levers 6. can.

In addition, since the cam grooves 10 and 11 are provided on a single cam disk 8, the structure is simple, and since the cam floors 14 and 20 are forced to move by the cam grooves 10 and 11, there is no need for a return mechanism. Improves followability.

Reference numeral 55 denotes a speed change lever for operating the above-mentioned composite speed change operation system, and is provided on the cover body 45 in the following manner. That is, reference numeral 56 denotes a U-shaped support member, which is disposed below the side end of the installation part 50 of the floor sheet 47 in the front-rear direction central part, in contact with the side end, and with rear and upper and lower openings. At the same time, its outer wall portion is removably fixed to the left fender 48 with bolts 57. A support shaft 58 is laterally inserted through both side walls of the support member 56, and
A retaining plate 59 is removably fixed to the outer surface of the outer wall of the support member 56 with bolts 60, and the retaining plate 59 completely prevents the support shaft 58 from protruding outward from the supporting member 56. . A collar 61 is rotatably fitted onto the support shaft 58 via a pair of bushes 62, and the collar 61 has a first interlocking lever 63 located below the installation part 50;
A fixed lever 65 that protrudes upward from an opening 64 opened between the side end of the installation part 50 and the side wall of the left fender 48 is fixed. The first interlocking lever 63 is interlocked with the second interlocking lever 6 via an interlocking rod 66, and the speed change lever 55 is fixed to the front side of the fixed lever 65. Reference numeral 67 designates a guide for the gear shift lever 55, which is attached along the left fender 48 so that its lower edge is in contact with the opening edge of the opening 64 on the installation side, and its outer peripheral edge is welded to the left fender 48. . A guide groove 6 into which the gear shift lever 55 is inserted is provided on the upper outer peripheral side of the guide 67.
8 is formed in the front-rear direction. The right fender side portion of the cover body 45 is also provided with various operating levers 69 to 72 for hydraulic braking and the like and their guides 73 in the same manner as described above.

According to the comparative example configured as described above, by rotating the shift lever 55 in the front-rear direction,
The main shaft 6 is rotated through the first interlocking lever 63, the interlocking rod 66, and the second interlocking lever 6, and the sub-transmission and the creep transmission can be operated by the single shift lever 55. It is. Further, the cover body 45 is supported by the vehicle body T via the vibration isolators 39 and 53, and the fender 48 of the cover body 45 is
Since the speed change lever 55 is supported by the speed change lever 55, vibrations from the vehicle body T side are hardly propagated to the speed change lever 55, and the speed change lever 55 hardly vibrates. Furthermore, since the shift lever 55 and its guide 67 are provided on the fender 48 side, the shift lever 55 and the guide 67 can be easily assembled in a predetermined positional relationship. Further, since the side wall portion of the left fender 48 is also located on the outer side of the guide 67, mud does not adhere to the base of the gear change lever 55 or the fixed lever 65.

By the way, in the above comparative example, the support member 56 is fixed only to the fender 48, and the support shaft 58 of the shift lever 55 is supported by the cover body 45 only at one end, so that the shift lever 55 cannot be supported reliably. There is a problem with that.

This problem has also been solved in the first embodiment of the present invention shown in FIG. 9, in which the upper edge of the support member 56 is welded to the lower surface of the installation part 50 of the floor sheet 47. Further, the lower part of the center part of the left fender 48 side wall in the longitudinal direction is formed to bulge inward to form a guide 67, and the base of the gear change lever 55 and the fixed lever 65 are covered opposite the guide 67. A cover plate 74 is welded to the left fender 48.

10 and 11 show a second embodiment of the present invention, in which a square tube piece 75 is fixed to the base side of the gear shift lever 55, and a guide 67 and a left fender are attached to both sides of the square tube piece 75. Hemispherical protrusions 76 made of resin that abut against both side walls of 48 are fixed.

FIG. 12 shows a third embodiment of the present invention.
An insertion hole 77 is formed at the base of the speed change lever 55,
The guide 67 and the left fender 4 are inserted into the insertion hole 77.
Elastically deformable resin attachment pieces 78 that come into contact with both side walls of the housing 8 are removably fitted. Mounting piece 78
consists of a pair of truncated conical parts 80 having a groove 79 and a connecting part 81 having a circular cross section and connecting these truncated conical parts 80 and located within the insertion hole 77 .

According to the second and third embodiments described above, the gear shift lever 5
The vibrations described in No. 5 and the generation of noise caused by the vibrations can be completely prevented.

Note that although the present invention is applied to a speed change lever device in the embodiment, the present invention can be applied to various other operating lever devices.

As detailed above, according to the present invention, the operating lever is supported by the cover body provided on the vehicle body through the vibration isolating material, so that almost no vibration is transmitted from the vehicle body to the operating lever, and the operating lever is There is almost no vibration, and the operating lever and its guide can be easily assembled in a predetermined positional relationship. Further, a support member is disposed below one of the left and right sides of the floor sheet, and both left and right sides of the support member are fixed to the lower surface of the floor sheet and the inner surface of the fender, respectively.
A support shaft is supported across the left and right sides of these support members, and an operating lever is provided on the support shaft so as to be rotatable around the axis of the support shaft, so that the support shaft provided with the operating lever is at both ends. supported by the cover body, therefore
The operating lever is reliably supported by the cover body. The present invention has the above-mentioned advantages, has a simple structure, can be implemented at low cost, and is highly profitable.

[Brief explanation of the drawing]

1 and 8 show a comparative example of the present invention, FIG. 1 is a perspective view, FIG. 2 is a side view, and each of FIGS. 3 and 4 is taken along line A-A in FIG. 2. , sectional view taken along the line B-B, FIG. 5 is a sectional view showing the internal mechanism of the composite speed change operation transmission device, FIG. 6 is a sectional view taken along the line C-C of FIG. 5, and FIG. is a cross-sectional view taken along the line D-D in FIG. 3, FIG. 8 is a cross-sectional view taken along the line E-E in FIG. 7, and FIG.
10 and 10 are rear sectional views showing the first and second embodiments of the present invention, FIG. 11 is a perspective view of the main part of FIG. 10, and FIG. 12 is a third embodiment of the present invention. FIG. T... Tractor body, 2... Speed change operation transmission device, 39, 53... Vibration isolating material, 45... Cover body,
46...seat, 47...floor seat, 48...
fender, 55...shift lever, 56...support member, 58...support shaft, 67...guide.

Claims (1)

[Scope of claim for utility model registration] A cover body is provided on the vehicle body via a vibration isolating material, and the cover body covers the upper part of the vehicle body and covers the floor seat on which the seat is arranged above, and the left and right sides of the floor seat. a pair of fenders fixed to the floor sheet, and a guide for the operating lever is provided on one left and right side of the cover body, and a support member is disposed below the one side of the floor sheet, and the support member The left and right sides of the support member are fixed to the lower surface of the floor sheet and the inner side of the fender, respectively, and support shafts are supported across the left and right sides of these supporting members, and the operating lever is attached to the support shaft so that the operating lever is aligned with the axis of the support shaft. An operating lever device for a tractor or the like, characterized in that the operating lever is rotatably provided around the vehicle body and is interlocked and connected to a transmission on the vehicle body side via an interlocking mechanism.