JP3554386B2 - Work vehicle - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a brake in which a support frame for supporting a steering shaft is fixed to a vehicle body frame, and vertically penetrates a platform disposed on one side of a column portion that covers the support frame, and is rotatably supported by the support frame. A brake pedal is detachably attached to an upper end of the lever, and a clutch pedal is detachably attached to an upper end of a clutch lever rotatably supported on a support frame by vertically penetrating a platform disposed on the other side of the column portion. And a work vehicle attached to the work vehicle.
[0002]
[Prior art]
Conventionally, in such a work vehicle, a brake lever and a clutch lever are rotatably supported by cantilever support by a support member attached to the support frame, or are rotatably supported on both sides of the support frame. Are rotatably supported by a support frame by being integrally provided with the support frame.
[0003]
[Problems to be solved by the invention]
By the way, if the column part and the platforms on both sides of the column part can be integrally formed of synthetic resin, the assembling becomes easy and the number of parts can be reduced. In this case, when the pedal is placed relatively far from the support frame, the point of application of load to the pedal becomes a position far from the support member, and the rigidity is increased because the load from the lever may be applied to the platform. It is necessary to firmly support the platform with the body frame, so it is impossible to integrally mold the platform with the column. On the other hand, when the levers are integrally connected to the shafts supported on both sides of the support frame on both sides, there is no danger that a load from the levers will be applied to the platform because of the support on both sides. Integral molding with resin is possible, but the brake lever and clutch lever will be located in front and rear positions of the body frame, and the platform will not have a notch for loosening the brake lever and clutch lever. As far as possible, it is difficult to assemble a cover integrally including the column portion and the platform, and the strength of the platform may be reduced by the cutout portion.
[0004]
The present invention has been made in view of such circumstances, and has as its object to provide a work vehicle in which the platform and the column portion can be integrally formed of a synthetic resin while avoiding a decrease in the strength of the platform. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a support frame for supporting a steering shaft is fixed to a vehicle body frame and vertically penetrates a platform disposed on one side of a column portion covering the support frame. A brake pedal is detachably attached to the upper end of a brake lever rotatably supported on the support frame, and vertically penetrates a platform disposed on the other side of the column portion to be rotatably supported on the support frame. In a working vehicle in which a clutch pedal is detachably attached to an upper end of a clutch lever to be mounted, a cover made of synthetic resin integrally including a column portion and platforms on both sides of the column portion is attached to a vehicle body frame by raising the cover upward. The support frame is provided with a support shaft extending in the width direction of the vehicle body frame, and is rotated at two locations spaced apart in the axial direction of the support shaft. The lower end of the brake lever is integrally connected to the outer end of the freely supported brake-side support member, and the clutch-side support member is rotatably supported at two locations spaced apart in the axial direction of the support shaft. The lower end of the clutch lever is integrally connected to the outer end of the lever, and holes for inserting the brake lever and the clutch lever are provided on both platforms over the operating range of each lever.
[0006]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, a brake-side arm integrally connected to an inner end of the brake-side support member and a clutch-side support member are provided. An interlocking link mechanism for interlocking the operation of the brake-side arm with the operation of the brake-side arm is provided between the clutch-side arm integrally connected to the end.
[0007]
[Action]
According to the configuration of the first aspect of the present invention, the brake lever and the clutch lever are integrally connected to the brake-side support member and the clutch-side support member that are supported at both ends by the support shaft. To prevent the load from acting on the platform and to be integrally formed with the column of the platform.Moreover, both levers are arranged at the same position along the front and rear direction of the body frame, so that both levers are inserted through the holes In addition, the cover can be assembled to the body frame.
[0008]
According to the configuration of the second aspect of the present invention, the brake-side arm and the clutch-side arm can be coaxially supported and arranged close to each other, so that the interlocking link mechanism can be easily configured.
[0009]
【Example】
Hereinafter, an embodiment in which the present invention is applied to a riding lawn mower will be described with reference to the drawings.
[0010]
1 to 5 show an embodiment of the present invention. FIG. 1 is a side view of a riding lawn mower, FIG. 2 is a plan view of the riding lawn mower, and FIG. 3 is a line 3-3 in FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. 5 is a perspective view when the cover is assembled.
[0011]
First, in FIG. 1 and FIG. 2, a pair of front wheels W _F is the front portion of the vehicle body frame _11, W _F is steerably suspended. On the other hand, the rear portion of the body frame 11 and the transmission case 12 is fixed, the left of the transmission case 12, the rear wheel at the rear axle housing 13 secured to the right side faces W _R, W _R the shaft rotatably Supported. And Thus, power input into the input shaft 14 protruding from the top of the transmission case 12, the transmission mechanism and the differential mechanism rear both via a (not shown) wheel W _R of the transmission case _12, the W _R Is transmitted.
[0012]
A vertical engine E is mounted on a front portion of the body frame 11. A support frame 15 is fixed to the body frame 11 on the rear side of the engine E, and a cover 16 having a column portion 16a extending upward to cover the support frame 15 covers the upper portion on the rear side of the body frame 11. It is attached as follows. The passenger seat 17 is disposed on the cover 16 at a position spaced rearward from the column portion 16a. Further, the engine E and the like on the body frame 11 are covered with a bonnet 18 connected to the body frame 11 so as to be able to jump forward.
[0013]
Power from the crankshaft 20 having a substantially vertical axis and extending downward from the engine E is transmitted to the input shaft 14 of the transmission case 12 via power transmission means 21. The power transmission means 21 includes a drive pulley 22 fixedly provided at an intermediate portion of the crankshaft 20, a driven pulley 23 fixedly provided on the input shaft 14, and rear wheel power wound around the drive pulley 22 and the driven pulley 23. A state where the endless belt 24 is tensioned to transmit power from the crankshaft 20 to the input shaft 14, and a state where the tensioned state of the endless belt 24 is relaxed and power transmission is interrupted. Can be switched.
[0014]
Front wheels _W F, _{W F} and the rear wheels _W R, _W is below the vehicle body frame 11 between _R is arranged cutter housing 25, the cutter housing 25 is supported on the body frame 11 as a possible lifting by the link mechanism 26 Is done.
[0015]
Cutter housing 25 is intended to be formed into a dish shape that is open downward, into the cutter housing 25, a pair of cutters 27 _1, 27 ₂ is housed rotatably. On both sides of the cutter housing 25, scalp rollers 28, 28 that roll on the ground to define the lowermost position of the cutter housing 25 are pivotally supported.
[0016]
The link mechanism 26 includes a pair of front links 29 connecting between the front part of the body frame 11 and the front part of the cutter housing 25, and a pair of rear links 30 connecting between the middle part of the body frame 11 and the rear part of the cutter housing 25. By operating a lifting operation lever 31 connected to one of the two rear links 30 and disposed on the left side of the passenger seat 17, the cutter housing 25 is Thus, the ascent / descent operation is performed with the attitude with respect to the ground kept constant.
[0017]
On the cutter housing 25, the driven pulley ₃₃ 1 on both cutter ₂₇ 1, 27 ₂ coaxially connected to, 33 ₂ are disposed. On the other hand, to the crankshaft 20 of the engine E is driven pulley 34 is fixed, the drive pulley 34 and both the driven pulley 33 _1, 33 ₂ and the endless belt 35 is wound around belt-driven system 36 are configured Is done. Thus, the wrapping transmission system 36 includes a clutch-on state in which the endless belt 35 is tensioned in accordance with the rotation operation of the operation shaft 32 which is disposed vertically in the column portion 16a, and an endless belt 35. The operation lever 37 is fixed to the upper end of the operation shaft 32.
[0018]
The support frame 15 supports a steering shaft 40 extending vertically in the column portion 16a. A steering handle 41 is attached to the upper end of the steering shaft 40 above the column portion 16a.
[0019]
With reference to FIGS. 3 and 4, the body frame 11 is formed by connecting upper ends of a pair of vertical frame portions 11a, 11a extending in the front-rear direction in parallel with each other by a connecting portion 11b. A support frame 15 is attached to the vehicle body frame 11 so as to cover the connecting portion 11b from above. Thus, the support frame 15 includes a pair of side support portions 15a, 15a fixed to the outer surfaces of both the vertical frame portions 11a, 11a of the body frame 11, and upper ends of the side support portions 15a, 15a. It is formed in a substantially U-shape that is opened downward with an upper supporting portion 15b connecting between them.
[0020]
The cover 16 has a column portion 16a and platforms 16b and 16c on both sides of the column portion 16a, and is integrally formed of a synthetic resin. Support flanges 42, 42 which are turned outward are provided on both side support portions 15a, 15a of the support frame 15, and the platform of the cover 16 is provided on the support flanges 42, 42. Floor mount pipes 43, 43 for supporting 16b, 16c are fastened. Further, at the side support portions 15a, 15a, support flanges 44, 44 which are folded outward are provided above the support flanges 42, 42, and are provided on the support flanges 44, 44. The column portion 16a of the cover 16 is directly fastened.
[0021]
Support shafts 45 extending in the width direction of the body frame 11 are supported by both side support portions 15a, 15b of the support frame 15 below the body frame 11, and both ends of the support frame 45 are supported by both side support portions 15a, 15a. Protruding outward.
[0022]
On the right side of the column portion 16a, a brake pedal 47 to which a brake pedal 46 is detachably attached at an upper end is arranged to be inclined in a direction away from the column portion 16a as going upward. The lower end is integrally connected to a brake-side support member 48 rotatably supported on a support shaft 45. On the left side of the column portion 16a, a clutch lever 50 to which a clutch pedal 49 is detachably attached at an upper end is arranged so as to be inclined away from the column portion 16a as going upward. Is integrally connected to a clutch-side support member 51 rotatably supported by a support shaft 45.
[0023]
A retaining ring 52 is fitted to the right outer end of the support shaft 45, and the brake-side support member 48 is attached to the support shaft 45 so as to prevent the brake ring support member 52 from being detached outward in the axial direction. Is done. The brake-side support member 48 is formed in a substantially U-shape in a plane including the axis of the support shaft 45, and both ends thereof are rotatably supported by the support shaft 45. That is, the brake-side support member 48 is rotatably supported on the support shaft 45 at two locations spaced apart in the axial direction, and the lower end of the brake lever 47 is integrated with the outer end of the brake-side support member 48. It will be installed continuously. In addition, a cylindrical collar 53 that surrounds the support shaft 45 is interposed between the outer surface of the one side support portion 15a of the support frame 15 and the outer end of the brake-side support member 48. The movement of the brake-side support member 48 along the axis of the support shaft 45 is regulated by the wheel 52 and the collar 53.
[0024]
A retaining ring 54 is fitted to the left outer end of the support shaft 45, and the clutch-side support member 51 is attached to the support shaft 45 so as to prevent the clutch ring support member 51 from being detached outward in the axial direction. Is done. The clutch-side support member 51 is formed in a substantially U-shape in a plane including the axis of the support shaft 45, and both ends thereof are rotatably supported by the support shaft 45. That is, the clutch-side support member 51 is rotatably supported at two positions spaced apart in the axial direction of the support shaft 45, and the lower end of the clutch lever 50 is integrated with the outer end of the clutch-side support member 51. It will be installed continuously. In addition, a cylindrical collar 55 surrounding the support shaft 45 is interposed between the outer surface of the other side support portion 15a of the support frame 15 and the outer end of the clutch-side support member 51, and the stop is provided. The movement of the clutch-side support member 51 along the axis of the support shaft 45 is restricted by the wheel 54 and the collar 55.
[0025]
A brake-side arm 56 is integrally connected to an inner end of the brake-side support member 48, and a clutch-side arm 57 is integrally connected to an inner end of the clutch-side support member 51. Thus, the clutch arm 57 and the clutch lever 50 are interlocked between the two arms 56 and 57 for the operation of the brake lever 47, that is, the brake side arm 56, and the brake arm 56 and the brake lever 47 are operated for the operation of the clutch side arm 57. An interlocking link mechanism 58 is provided so as not to interlock.
[0026]
By the way, holes 59, 60 for penetrating the brake lever 47 and the clutch lever 50 are provided in both platforms 16b, 16c over the operating range of the levers 47, 50. The two holes 59 and 60 are formed so as to be separated from the column portion 16a toward the front side by being inclined toward the side away from the column portion 16a as going toward.
[0027]
Next, the operation of this embodiment will be described. A brake-side support member 48 and a clutch-side support member 51 are rotatably supported on a support shaft 45 provided on the support frame 15. 51 is supported at both ends by a support shaft 45. In addition, a brake lever 47 and a clutch lever 50 are integrally connected to the support portions 48 and 51. Therefore, the brake lever 47 and the clutch lever 50 are rigidly supported without giving stress to the platforms 16b and 16c. The platforms 16b and 16c are integrated with the column portion 16a and the cover 16 is made of synthetic resin. It is possible to integrally mold.
[0028]
In addition, the brake lever 47 and the clutch lever 50 are arranged at the same position along the front-rear direction of the vehicle body frame 11, and the levers 48 and 50 from which the brake pedal 46 and the clutch pedal 49 are removed are moved toward the support frame 15 side. In the assembled state, as shown in FIG. 5, the cover 16 can be assembled to the body frame 11 so as to cover the support frame 15 and the body frame 11, and at this time, both levers 47, 50 It can be inserted into the holes 59 and 60 of the platforms 16b and 16c without difficulty, and it is not necessary to provide a notch for lever insertion in the platforms 16b and 16c unlike the related art, thereby contributing to the improvement of the strength of the platforms 16b and 16c. Can be.
[0029]
The brake-side arm 56 and the clutch-side arm 57 are integrally connected to the brake-side support member 48 and the clutch-side support member 51, respectively. Therefore, the interlocking link mechanism 58 can be easily configured.
[0030]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0031]
【The invention's effect】
As described above, according to the first aspect of the present invention, the cover made of a synthetic resin integrally including the column portion and the platforms on both sides of the column portion covers the body frame from above. An outer end portion of a brake-side support member mounted on the support frame and provided with a support shaft extending in the width direction of the vehicle body frame, and rotatably supported at two positions spaced apart in the axial direction of the support shaft. The lower end of the brake lever is integrally connected to the outer end of the clutch-side support member rotatably supported at two locations spaced apart in the axial direction of the support shaft. In both platforms, holes for inserting the brake lever and the clutch lever are provided over the operating range of each lever, so that the cover having the platform and the column portion is made of synthetic resin. Shaped it is possible to contribute to a reduction in reduced and parts of the assembly and disassembly work man-hour can be reduced strength of platform is also prevented.
[0032]
According to the second aspect of the present invention, the brake-side arm integrally connected to the inner end of the brake-side support member and the clutch-side arm integrally connected to the inner end of the clutch-side support member are provided. Between the two, there is provided an interlocking link mechanism that interlocks the clutch side arm with the operation of the brake side arm, so that the brake side arm and the clutch side arm are coaxially supported and arranged close to each other to easily configure the interlocking link mechanism. Can be.
[Brief description of the drawings]
FIG. 1 is a side view of a riding lawn mower.
FIG. 2 is a plan view of a riding lawn mower.
FIG. 3 is a cross-sectional view of a main part along line 3-3 in FIG. 1;
FIG. 4 is a view taken along line 4-4 of FIG. 3;
FIG. 5 is a perspective view when the cover is assembled.
[Explanation of symbols]
11 Body frame 15 Support frame 16 Cover 16a Column sections 16b, 16c Platform 40 Steering shaft 45 Support shaft 46 Brake pedal 47 ··· Brake lever 48 ··· Brake side support member 49 ··· Clutch pedal 50 ··· Clutch lever 51 ··· Clutch side support 56 ··· Brake side arm 57 ··· Ciratch side arm 58 ··· Linkage link mechanism 59, 60 ... hole

Claims (2)

A support frame (15) for supporting the steering shaft (40) is fixed to the body frame (11), and a platform (16b) arranged on one side of a column (16a) covering the support frame (15) is vertically moved. A brake pedal (46) is removably attached to the upper end of a brake lever (47) which penetrates and is rotatably supported by the support frame (15), and a platform is disposed on the other side of the column portion (16a) In a working vehicle in which a clutch pedal (49) is detachably attached to an upper end of a clutch lever (50) rotatably supported on a support frame (15) by vertically passing through (16c), a column portion (16a). And a cover (16) made of synthetic resin integrally having the platforms (16b, 16c) on both sides of the column portion (16a), and the cover (16) is placed on the body frame (11). The support frame (15) is provided with a support shaft (45) extending in the width direction of the vehicle body frame (11), and the support frame (15) is provided so as to be spaced apart from the support shaft (45) in the axial direction. A lower end of a brake lever (47) is integrally connected to an outer end of a brake-side support member (48) rotatably supported at a location, and is spaced apart in the axial direction of the support shaft (45). A lower end of a clutch lever (50) is integrally connected to an outer end of a clutch-side support member (51) rotatably supported at a location, and a brake lever (47) is provided on both platforms (16b, 16c). And a hole (59, 60) through which the clutch lever (50) is inserted is provided over the operating range of each lever (47, 50). A brake-side arm (56) integrally connected to the inner end of the brake-side support member (48) and a clutch-side arm (57) integrally connected to the inner end of the clutch-side support member (51). The work vehicle according to claim 1, further comprising an interlocking link mechanism (58) for interlocking the operation of the brake-side arm (56) with the operation of the clutch-side arm (57).

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