JP4373151B2 - Tractor - Google Patents

Description

  The present invention relates to a tractor.

Conventionally, as one form of tractor, a dashboard frame formed in a frontal gait type is set up on a step, and the base edge of the bonnet is pivotally supported and connected to the dashboard frame via a hinge. There is a bonnet that can be opened and closed freely (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 11-105740

  However, in the tractor, there are a large form and a small form depending on the model, and in the case of the large form, the engine part and the fuel tank are enlarged, the prime mover part is enlarged, and the bonnet that covers the prime mover part is also provided. The size of the hood is inevitably increased, and the size of the bonnet, particularly the front-rear width, differs between the large form and the small form.

  For this reason, manufacturing bonnets suitable for each of the large form and small form is the actual condition, and there is a need to prepare a bonnet mold for each form, which increases the production cost. .

Therefore, in the present invention, in the tractor in which the base end portion of the bonnet covering the prime mover portion is detachably pivoted and connected to the upper portion of the bonnet support piece formed in the rear view portal type, it is formed so as to be adapted to the short width specification. A tractor that is detachably attached to the rear edge of the bonnet and that can be changed to a bonnet that conforms to the long width specification. A support / reinforcing body formed in a rear gait type is attached along the rear edge, and the support / reinforcing body is formed by extending backward to pivotally connect the bonnet to the bonnet support piece. bonnet pivotally-connected body having a the arm pieces, and additional extension member which is formed along a rear edge of the hood is attached detachably, and bonnet pivotally-connected body by the support and reinforcement While supporting the 設延 length body, there is provided a tractor, characterized in that so as to reinforce the trailing edge of the bonnet.

The present invention also bonnet pivotally-connected body of the short-width specifications removal of the increased設延length body, the length of the previous SL arm piece which is formed by distracted rearwardly only amplification extension width of the additional extension member formed short In addition, it has a feature that it is possible to change the long width specification and the short width specification by changing the bonnet pivot support / connecting body and attaching / detaching the extension extension body.

(1) In the tractor according to the first aspect of the present invention, in the tractor in which the base end portion of the bonnet covering the prime mover portion is detachably pivoted and connected to the upper portion of the bonnet support piece formed in the rear view portal type, A tractor that can be changed to a bonnet that conforms to the long width specification by detachably attaching an extension extension to the rear edge of the bonnet that is formed according to the specification, and is a left and right side wall forming piece that the bonnet has and so along the rear edge of the ceiling portion forming member is attached to the support and reinforcement which is formed in rear view portal, the same support and reinforcement, in order to pivotally-connected to the hood to the hood support piece A bonnet pivot support / connecting body having an arm piece formed by extending rearwardly and an extension extension formed along the rear edge of the bonnet are detachably attached, and the bonnet is supported by the supporting and reinforcing body. Pivot Consolidated body and while supporting the additional extension member, and so as to reinforce the trailing edge of the bonnet.

  In this way, it is possible to change between a bonnet that is adapted to the short width specification and a bonnet that is adapted to the long width specification by attaching an extension to the rear edge of the bonnet. The bonnet itself can be shared in both the specifications and the long width specifications, and the types of bonnet molds can be reduced. As a result, the manufacturing cost of the bonnet can be greatly reduced.

(2) In the present invention of claim 2, wherein, bonnet pivotally-connected body of the short-width specifications removal of the increased設延length body, before Symbol arm piece which is formed by distracted backward lengths of the additional extension member By shortening only the amplification extension width, it is possible to change between the long width specification and the short width specification by changing the bonnet pivot / connector and attaching / detaching the extension extension.

In this way, the bonnet pivotally-connected body of the short-width specifications removal of the increased設延length body, the length of the distracted allowed to form the pre-Symbol arm pieces additional extension member amplified by extension width shorter formed rearward By changing the bonnet pivot / connector and attaching / detaching the extension extension, it is possible to change between the long width specification and the short width specification. It is possible to easily change the form from the specification to the long width specification.

  A shown in FIG. 1 is a tractor according to the present invention. The tractor A is provided with a prime mover portion 2 on a fuselage frame 1, and an engine E disposed on the prime mover portion 2 in a longitudinal direction via a clutch portion 3. The mission section 4 extending in the same manner is linked and the driving section 5 is arranged on the mission section 4, and a pair of left and right front wheels 7, 7 are attached to the body frame 1 via the front axle case 6. A transmission shaft 8 is interposed between the front axle case 6 and the transmission unit 4, and a pair of left and right rear wheels 10 and 10 are linked to the rear portion of the transmission unit 4 via a rear axle case 9. Yes. 11 is an elevating connection mechanism attached to the rear part of the mission unit 4, and 12 is a safety frame erected at a rear position of the operation unit 5.

  In this way, power is transmitted from the engine E to the clutch part 3 → the transmission part 4 → the transmission shaft 8 → the front axle case 6 → the front wheels 7 and 7, and the transmission part 4 → the rear axle case 9 → the rear wheels 10,10. It is possible to perform four-wheel drive travel by transmitting to the rear wheel 10 and to transmit power only to the rear wheels 10 and 10 to perform two-wheel drive travel.

  As shown in FIGS. 2 to 7, the fuselage frame 1 is installed between a pair of left and right frame forming pieces 20, 20 extending in the front-rear direction and the front end portions of both left and right frame forming pieces 20, 20. The front frame forming piece 21 is formed.

  As shown in FIGS. 2 to 7, the prime mover unit 2 has the engine E mounted between the rear portions of the left and right frame forming pieces 20, 20, and a radiator 22 is disposed immediately before the engine E. A battery 23 is disposed immediately before the radiator 22, and a fuel tank 24 is disposed immediately after the engine E. The fuel tank 24 is covered with an openable / closable bonnet 25 shown in FIG. 26 is a muffler, and 27 is an air cleaner.

  As shown in FIGS. 2 to 7, a support 30 is provided between the front portions of the left and right frame forming pieces 20, 20, and the radiator 22 and the battery 23 are concentrated on the support 30. In addition, these are integrally attached via the support 30.

  In this way, the radiator 22 and the battery 23 are centrally arranged on the support 30 provided on the body frame 1, and these are integrally attached via the support 30, thereby reducing the number of parts. In addition, it is possible to reduce the labor for mounting the radiator 22 and the battery 23.

  In addition, since the radiator 22 and the battery 23 are concentrated on the support body 30, the prime mover unit 2 can be made more compact, and further the machine body can be made more compact.

  That is, as shown in FIGS. 3 to 7, the support 30 is formed in a substantially rectangular plate shape, and a support piece 31 that supports the radiator 22 and the battery 23, and the left and right rear positions of the support piece 31. A pair of left and right fixing column pieces 32 and 32 that are formed to rise upward and fix the left and right side edges of the radiator 22, and the rear end of the support piece 31 between the lower portions of both fixing column pieces 32 and 32 A sealing piece 33 that is formed to rise upward from the edge and seals the gap between the lower end edge of the radiator 22 and the support main piece 31 is provided.

  Then, a convex locking piece 34 extending in the left-right direction is formed in the central portion of the support piece 31, and a support shaft 35 extending in the left-right direction is inserted into the locking piece 34, A battery unit is provided with a base end portion of a pair of left and right connecting arm pieces 36, 36 extending in the vertical direction at the left and right end portions of the shaft 35, and extending in the left-right direction between the distal end portions of the both connecting arm pieces 36, 36. A joint piece 37 is interposed.

  Here, the battery engagement piece 37 is formed in an L-shaped cross section so as to be engaged with a corner which is the front upper edge of the battery 23, and the arm piece insertion holes 38, 38 are formed on the left and right sides, The male screw portions 36a, 36a formed at the distal ends of the connecting arm pieces 36, 36 are inserted into the arm piece insertion holes 38, 38, and nuts 39, 39 are screwed into the male screw portions 36a, 36a. I have to.

  In this way, the rear lower edge of the battery 23 is locked to the locking piece 34, and the battery engagement is provided at the tip of the connecting arm pieces 36, 36 via the arm piece insertion holes 38, 38. By engaging the piece 37 with the front upper edge of the battery 23 and screwing the nuts 39 and 39 to the male screw portions 36a and 36a formed at the front ends of the connecting arm pieces 36 and 36, the battery 23 Can be fastened and fixed.

  Therefore, the attachment structure of the battery 23 can be simplified, and the battery 23 can be attached easily and reliably.

  In addition, left and right shielding pieces 40, 40 extending in the vertical direction are formed on the left and right rear ends of the pair of right and left fixing support pieces 32, 32 so as to project outward, and both fixing support support pieces 32 are provided. 32, upper shielding pieces 41 extending in the left-right direction are formed, and the edge portions of these shielding pieces 41 are closed with a vibration-proof / sealing rubber body (not shown). The space on the engine E side behind the radiator 22 and the space on the battery 23 side in front of the radiator 22 can be shielded by contacting the inner peripheral surface of the bonnet 25. 42 is a shroud.

  Moreover, between the lower portions of the left and right shielding pieces 40, 40, the sealing piece 33 formed by raising upward from the rear end edge of the support main piece 31 is disposed, and the lower end of the radiator 22 is formed by the sealing piece 33. The gap between the edge and the support book 31 is sealed.

  Therefore, the sealing piece 33 can reliably prevent the heat radiation from the engine E arranged immediately after the radiator 22 from passing through the gap between the radiator 22 and the support main piece 31 to the front of the radiator 22. The heat dissipation efficiency of the radiator 22 can be ensured satisfactorily.

  Further, as shown in FIGS. 3, 4, 6, and 7, a bonnet lock body 43 that locks the bonnet 25 in the closed state is provided at the center front portion of the support main piece 31. The body 43 is provided with a pivot piece 45 in a notch 44 formed in the support main piece 31, a fixed side lock piece 46 is fixed to the pivot piece 45, and a movable side is provided in the middle of the fixed side lock piece 46. The middle part of the lock piece 47 is pivotally supported via the pivot 48 and is movable by inserting a tension spring 49 between the lower end of the movable lock piece 47 and the lower part of the pivot piece 45. The side lock piece 47 is elastically biased to rotate in the locking direction about the pivot 48.

  When the bonnet 25 is closed in this manner, the engaging pin 51 (see FIG. 1) suspended from the front of the bonnet 25 is pushed down between the fixed side lock piece 46 and the movable side lock piece 47. The movable side lock piece 47 is rotated against the elastic biasing force of the tension spring 49 in the direction opposite to the lock direction so as to be locked between the lock pieces 46 and 47.

  An unlocking piece 50 is interlocked and connected to the movable side lock piece 47. By rotating the lock release piece 50 upward, the movable side lock piece 47 is locked around the pivot 48. It is rotated in the opposite direction so that it can be unlocked.

  At this time, since the bonnet lock body 43 for locking the bonnet 25 in the closed state is provided on the support body 30, the bonnet lock body 43 is arranged at a predetermined position simply by attaching the support body 30 to the body frame 1. Therefore, the bonnet lock body 43 can be easily disposed, and the bonnet lock body 43 can be compactly disposed in the motor unit 2 together with the radiator 22 and the battery 23.

  As a result, in this case as well, the prime mover unit 2 can be made more compact, and further, the machine body can be made more compact.

  As shown in FIGS. 2 to 7, a pair of left and right receiving seats 55, 55 are provided on the left and right front portions of the support main piece 31, and the front and rear sides formed on the upper surface of each receiving seat 55, 55 are provided. The lower ends of compression springs 56 and 56 as shock absorbers for bonnet cushioning are attached to the high inclined surfaces 55a and 55a, and the upper ends of both compression springs 56 and 56 are arranged facing forward and upward.

  In this way, the lower end portion of the closed bonnet 25 is received and buffered by the compression springs 56 and 56, and the backlash of the bonnet 25 locked by the bonnet lock body 43 can be prevented. ing.

  At this time, since the support 30 is provided with receiving seats 55 and 55 for receiving the compression springs 56 and 56 for cushioning the bonnet, the support seats 55 and 55 can be mounted only by attaching the support 30 to the body frame 1. It is possible to arrange the receiving seats 55 and 55 easily in a predetermined position, and to arrange the receiving seats 55 and 55 together with the radiator 22 and the battery 23 in the motor unit 2 in a compact manner. can do.

  As a result, the prime mover unit 2 can be made more compact and the machine body can be made more compact in this respect as well.

  Further, as shown in FIGS. 1, 2, 8 and 9, a support frame 60 is disposed at the rear of the prime mover unit 2, and the fuel is disposed on the support frame at a position immediately behind the engine E. The tank 24 and a dashboard 61 described later are integrally supported.

  As shown in FIGS. 10 and 11, the support frame body 60 is raised upward in front of the fuel tank 24 from the support frame main piece 63 that supports the fuel tank 24 and the support frame main piece 63. The formed partition wall forming piece 64, the dashboard support piece 65 formed by raising upward from the support frame main piece 63 behind the fuel tank 24, and the support frame main piece 63 straddling the rear portion of the fuel tank 24 A bonnet support piece 66 is provided.

  The support frame main piece 63 is formed in a quadrangular plate shape extending in the left-right direction, and the center portion 63a is formed in a stepped concave shape, and a pair of left and right clutch portion connecting pieces 67 is provided at the rear portions of the left and right side portions 63b, 63b. , 67 are suspended downward, and a pair of left and right lower dashboard lower connection pieces 68, 68 are suspended downward at the front of the left and right side parts 63b, 63b. Connection holes 94, 94, 94, 94 that open in the left-right direction are formed in the board lower connection pieces 68, 68.

  In this way, the support frame main piece 63 is connected to the side wall of the clutch portion 3 via the pair of left and right clutch portion connecting pieces 67, 67 and is disposed at a position directly above the clutch portion 3.

  The partition wall forming piece 64 is formed by being raised toward the front upper side substantially along the rear wall of the engine E mounted immediately before the front edge of the support frame main piece 63. On the rear surface (rear surface), a reinforcing piece 69 that is formed in a rear-view portal shape and is formed along the rear surface of the partition wall forming piece 64 is connected, and the partition wall forming piece 64 is reinforced by the reinforcing piece 69. Yes.

  Here, the left and right lower end portions 69a and 69a of the reinforcing piece 69 are fixed to the upper surfaces of the left and right side portions 63b and 63b of the support frame main piece 63, respectively.

  Further, as shown in FIGS. 1 and 8, a bonnet side connection bracket 127 is attached to the middle portion of the bonnet 25, while a support frame body side connection bracket 128 is attached to the center of the upper end of the partition wall forming piece 64. A bonnet opening holding stand 129 for holding the bonnet 25 in an open state is interposed therebetween.

  The dashboard support piece 65 is formed in a rear view portal type, and the left and right side lower end portions 65a and 65a are fixed to the upper surfaces of the left and right side portions 63b and 63b of the support frame main piece 63, and both left and right side lower end portions 65a and 65a are fixed. Further, left and right side portions 65b, 65b are formed to rise rearward and upward, and an upper portion 65c extending in the left-right direction is disposed at a rear position of the fuel tank 24. Dashboard upper connection pieces 65d, 65d are formed, and connection holes 65e, 65e that open in the front-rear direction are formed in the lower half dashboard upper connection pieces 65d, 65d. Is supported from the inside.

  The bonnet support piece 66 is formed in a rear-view portal type, and the left and right side lower end portions 66a and 66a are fixed to the upper surfaces of the left and right side portions 63b and 63b of the support frame main piece 63. The left and right side portions 66b, 66b are formed to rise upward, and an upper portion 66c extending in the left-right direction is disposed at a position directly above the fuel tank 24. The pin support arms 70, 70 are projected forward, and a bonnet pivot pin 71 extending in the left-right direction is installed between the pivot support pin support arms 70, 70, and the bonnet pivot pin 71 is connected to the bonnet pivot pin 71. The bonnet 25 is pivotally supported and connected via a support / connector 72 so as to be detachable and turnable up and down, and the prime mover 2 and the fuel tank 24 are covered with the bonnet 25 so as to be opened and closed.

  In addition, upper and lower dashboard upper connection pieces 74 and 74 are formed on the left and right sides of the upper portion 66c, and connection holes 75 and 75 are formed in the upper half dashboard upper connection pieces 74 and 74 to open in the vertical direction. Further, between the upper surfaces of the left and right side portions 63b, 63b of the support frame main piece 63 and the left and right side lower end portions 66a, 66a of the bonnet support piece 66, the upper half dashboard lower connection piece 76 , 76 is formed, and connecting holes 77, 77 that open in the left-right direction are formed in the upper lower dashboard connecting pieces 76, 76 so that the dashboard 61 is supported from the inside by the bonnet support piece 66. I have to.

  Here, as shown in FIGS. 8 and 9, the dashboard 61 is divided into an upper half dashboard forming body 78 and a lower half dashboard forming body 79 in the vertical direction.

  The upper half dashboard forming body 78 includes left and right side wall forming pieces 80, 80, a ceiling portion forming piece 81, a rear wall forming piece 82, and an operation panel portion forming piece 136. 80 and the front edge part of the ceiling part forming piece 81 are formed along the front edge type joint edge 83, and the connecting hole 84 opened in the vertical direction on the upper left and right sides of the joint edge 83, 84, and connecting holes 85, 85 that open in the left-right direction at the left and right side lower portions, while fitting grooves along the lower edge of the left and right side wall forming pieces 80, 80 and the rear wall forming piece 82. An edge 86 is formed.

  In this way, the connecting holes 75, 75 formed in the upper half dashboard upper connecting pieces 74, 74 are aligned with the connecting holes 84, 84 formed in the joining edge 83, and screwed together. By connecting the connecting holes 85, 85 formed in the joining edge 83 to the connecting holes 77, 77 formed in the lower dashboard connecting pieces 76, 76 and screwing, the upper half of the support frame 60 The dashboard forming body 78 can be detachably attached.

  Further, the lower half dashboard forming body 79 includes left and right side wall forming pieces 87, 87 and a rear wall forming piece 88, and is provided at the upper edge of the left and right side wall forming pieces 87, 87 and the rear wall forming piece 88. The protrusions 89 for fitting are formed along the edges, and the connecting protrusions 90, 90 are formed on the left and right sides of the upper edge of the rear wall forming piece 88, and the connecting protrusions 90, 90 are arranged in the front-rear direction. While forming the connecting holes 91, 91 that open, cylindrical connecting pieces 92, 92, 92, 92 are formed on the front inner surface of the left and right side wall forming pieces 87, 87, and each connecting piece 92, 92, 92, Connection holes 93, 93, 93, 93 that open in the left-right direction are formed in 92.

  In this way, the connecting holes 65e, 65e formed in the lower half dashboard upper connecting pieces 65d, 65d are aligned with the connecting holes 91, 91 formed in the connecting protrusions 90, 90 and screwed, The connecting holes 94, 94, 94, 94 formed in the lower half dashboard lower connecting pieces 68, 68 are aligned with the connecting holes 93, 93, 93, 93 formed in the connecting pieces 92, 92, 92, 92. The lower half dashboard forming body 79 can be detachably attached to the support frame 60 by screwing.

  At this time, the fitting convex strip edge 89 formed on the upper end edge of the lower half dashboard forming body 79 is fitted to the fitting concave strip edge 86 formed on the lower end edge of the upper half dashboard forming body 78. Are fitted and joined from above.

  Thus, since the fuel tank 24 and the dashboard 61 are integrally supported by the support frame 60 disposed at the rear part of the prime mover unit 2, the number of parts can be reduced, and the fuel tank 24 and The labor for mounting the dashboard 61 can be reduced.

  Moreover, since the fuel tank 24 and the dashboard 61 are integrally supported by the support frame 60, the fuel tank 24 and the dashboard 61 can be arranged in a compact manner, and the airframe can be made compact. it can.

  Further, the fuel tank 24 can be reliably supported by the support frame main piece 63, and the hot air of the engine E disposed in the prime mover section 2 can be reliably cut off from the fuel tank 24 by the partition wall forming piece 64. In addition, the dashboard 61 can be reliably supported by the dashboard support piece 65.

  At this time, since the dashboard support piece 65 supports the dashboard 61 from the inside, the structure can be simplified without exposing the dashboard 61 to the outside, and the aesthetic appearance of the aircraft is enhanced. be able to.

  The bonnet support piece 66 provided on the support frame 60 is detachably pivotally connected to the bonnet 25 so that the bonnet 25, the fuel tank 24, and the dashboard 61 are arranged in a compact manner. The airframe can be supported and the airframe can be made compact.

  The bonnet 25 is formed so as to be adapted to the short width specification as shown in FIGS. 12 to 15, and an extension extension body 95 is detachably attached to the rear end edge portion to adapt to the long width specification. It can be changed freely.

  That is, the bonnet 25 includes left and right side wall forming pieces 96, 96, a ceiling portion forming piece 97, and a front grill forming piece 98, and a rear end edge portion of the left and right side wall forming pieces 96, 96 and the ceiling portion forming piece 97. The engagement piece 99 is bent inward at a substantially right angle, and the support / reinforcing body 100 is attached along the front surface of the engagement piece 99.

  As shown in FIG. 12, the ceiling-forming piece 97 is formed such that the left and right width Wb of the rear portion is narrower than the left and right width Wa of the front portion, and the front wheels 7 by an operator seated on the driving portion 5 described later are formed. , 7 has good visibility to the ground contact surface.

  Further, as shown in FIGS. 8 and 13 to 16, the support / reinforcement body 100 is arranged along the front and rear wall forming pieces 101 and 102 formed in a rear view portal type, and the lower edge of the front and rear wall forming pieces 101 and 102. It is formed in a rear view portal shape and is formed in a U-shaped cross section from a bottom forming piece 103 interposed between both front and rear wall forming pieces 101 and 102, and the extending direction of the front and rear wall forming pieces 101 and 102 and the engaging piece 99 The end surfaces of the front and rear wall forming pieces 101 and 102 are brought into contact with the inner surfaces of the left and right side wall forming pieces 96 and 96 of the bonnet 25 and the ceiling portion forming piece 97, and the rear wall forming piece 102 is formed. The rear surface is attached in contact with the front surface of the engagement piece 99.

  In addition, a plurality of (six in this embodiment) nuts 104 are attached to the bottom forming piece 103 of the support / reinforcing body 100 at intervals in the extending direction, and the bottoms coincide with the nuts 104. A communication hole 105 is formed in the formation piece 103.

  Further, a left / right extension support piece 106 extending in the left / right direction is installed between the left and right side portions of the front wall forming body 101 of the support / reinforcement body 100, and the bonnet pivot is supported at the center of the left / right extension support piece 106.・ A coupling body 72 is attached.

  The bonnet pivot support / connector 72 includes a mounting piece 107 formed by extending in the left-right direction, arm pieces 108, 108 formed by extending rearward from the left and right end portions of the mounting piece 107, and both arm pieces 108, 108. Reinforcing piece 109 laid horizontally between the bent parts formed at the rear part, and connecting pieces 110, 110 formed at the rear end part of each arm piece 108, 108, each connecting piece 110, 110 has a notch groove 111, 111, Pivot support / connection holes 112 and 112 communicating with the respective notch grooves 111 and 111 are formed.

  In this manner, the attachment piece 107 is brought into contact with the left and right extension support pieces 106 installed on the support / reinforcement body 100 in the front-rear superposed state and attached with the attachment bolts 113 and 113.

  As described above, the support / reinforcement body 100 supports the bonnet pivot support / connector 72 and the extension extension body 95 described later, and reinforces the rear edge of the bonnet 25.

  As shown in FIGS. 12 to 16, the extension extension 95 is formed in a rear view portal shape along the rear edge of the bonnet 25 and has a predetermined extension extension width W in the front-rear direction. A main piece 115, a mounting piece 116 that protrudes forward from the front end edge of the extension extension main piece 115 and is formed in a stepped concave shape, and a protrusion that protrudes inward from the rear end edge of the extension extension main piece 115. The mounting piece 116 is supported by an inward protruding piece 118 that comes into contact with the engaging piece 99 from the rear and an inner end edge of the inward protruding piece 118. A front projecting piece 119 that abuts the bottom forming piece 103 of the reinforcing body 100 from the inside is formed, and a bolt insertion hole 120 that coincides with the communication hole 105 is formed in the front projecting piece 119.

  In this manner, the extension bolt 95 is attached to the bonnet 25 by inserting the mounting bolt 121 into the corresponding bolt insertion hole 120 and the communication hole 105 and screwing the tip of the mounting bolt 121 to the nut 104. be able to.

  In this way, it is possible to change the bonnet 25 that is adapted to the short width specification and the bonnet 25 that is adapted to the long width specification by attaching the extension 95 to the rear edge of the bonnet 25. The bonnet 25 itself can be shared in both the short width and long width specifications, and the types of bonnet molds can be reduced. As a result, the manufacturing cost of the bonnet 25 can be greatly reduced. Can do.

  At this time, the front protruding piece 119, which is the tip of the mounting piece 116 formed on the front end edge of the extension extension body 95, is applied to the inner and outer overlapping state on the nut 104 provided on the inner peripheral surface of the rear end edge of the bonnet 25. Since the extension bolts 95 are attached to the bonnet 25 in a simple and reliable manner, it is possible to easily change the form from the short width specification to the long width specification.

  Next, with reference to FIGS. 15 to 17, a structure for mounting the bonnet pivot support / connector 72 provided on the bonnet 25 to the bonnet pivot pin 71 will be described.

  That is, as shown in FIGS. 15 to 17, the bonnet pivot pin 71 has constricted diameter-reduced portions 122 and 123 on the left and right sides, and has substantially the same interval as the interval between the connection pieces 110 and 110 of the bonnet pivot / connector 72. An opening piece 124 is formed at the right end.

  Pin insertion holes 125 and 125 are formed in a pair of left and right pivot support arms 70 projecting forward from the central portion of the upper portion 66c of the bonnet support piece 66 described above.

  In this way, as shown in FIG. 17 (a), the bonnet pivot pin 71 is inserted into the pin insertion holes 125, 125 from the right side to the left side, and the left and right sides formed on the bonnet pivot pin 71 are inserted. The reduced diameter portions 122 and 123 are positioned inside the pivot pin support arms 70 and 70.

  Then, the notch grooves 111 and 111 formed in the connecting pieces 110 and 110 of the bonnet pivot support / connecting body 72 are arranged in an opposed state at positions immediately before the both reduced diameter portions 122 and 123.

  In this state, by moving the bonnet pivot support / connector 72 rearward, as shown in FIG. 17B, the pivot support / connecting hole is passed through the notched grooves 111, 111 in the reduced diameter portions 122, 123 of the bonnet pivot pin 71. 112,112 are arranged.

  Subsequently, as shown in FIG. 17 (c), the bonnet pivot pin 71 is slid leftward to bring the retaining piece 124 into contact with the right pivot pin support arm 70, and the bonnet pivot A bonnet pivot pin 71 is disposed in the pivot / connection holes 112, 112 of the coupling body 72.

  At this time, the cutout groove 111 is formed to be slightly wider than the outer diameter of the reduced diameter portions 122 and 133 and narrower than the outer diameter of the bonnet pivot pin 71, while the pivot / connection hole 112 is formed to the bonnet. The diameter is larger than the outer diameter of the pivot pin 71.

  Therefore, the bonnet pivot support / connector 72 is pivoted / coupled to the bonnet pivot support pin 71 via the pivot support / connection holes 112, 112, and does not come out forward.

  Further, in this state, as shown in FIGS. 15 and 17C, a retaining pin 126 is attached to the left end portion of the bonnet pivot pin 71, and the bonnet pivot pin 71 is pulled out to the right. To prevent.

  In this way, the bonnet 25 can be pivotally supported and connected to the bonnet pivot pin 71 via the bonnet pivot / connector 72 so as to be pivotable up and down.

  Further, the bonnet 25 can be easily removed by following the procedure opposite to the pivoting / connecting procedure of the bonnet 25 described above.

  In this embodiment, the bonnet pivot / connector 72 for pivotally connecting / connecting the long-width bonnet 25 attached with the extension extension 95 has been described, but the short-width specification with the extension extension 95 removed. When the bonnet 25 is used, the arm piece 108 is replaced with the bonnet pivot / connector 72 formed by shortening the length of the arm piece 108 by the extension extension width W of the extension extension body 95.

  FIG. 18 shows a modification example of the bonnet pivot / connector 72. The bonnet pivot / connector 72 is provided with an expansion / contraction adjustment section 150 such as a turnbuckle in the middle of the arm piece 108. .

  That is, the expansion / contraction adjustment part 150 includes lock nuts 153 and 154 that are screwed and fitted to the peripheral surfaces of the base end side male thread part forming piece 151, the front end side male thread part forming piece 152, and the male thread part forming pieces 151 and 152. And a cylindrical expansion / contraction adjustment female screw part forming piece 155 that is screwed and fitted so as to straddle between the peripheral surfaces of both male screw part forming pieces 151 and 152, and includes a base end side male screw part forming piece The male threads of 151 and the distal male thread forming piece 152 are formed in opposite directions to each other, and the proximal half and the distal half of the female thread forming section 155 for expansion / contraction adjustment are mutually It is formed in the opposite direction.

  In this manner, by rotating the expansion / contraction adjustment female screw portion forming piece 155 in the forward direction, the base end side male screw portion forming piece 151 and the distal end side male screw portion forming piece 152 are separated from each other, and the arm piece 108 is separated. The base end side male screw portion forming piece 151 and the distal end side male screw portion forming piece 152 are brought close to each other by reversely rotating the expansion / contraction adjustment female screw portion forming piece 155. The arm piece 108 can be shortened and adjusted.

  When the expansion / contraction adjustment female thread portion forming piece 155 is rotated forward / reversely, the lock nuts 153 and 154 are appropriately rotated to finally lock the expansion / contraction adjustment female thread portion forming piece 155. Yes.

  As a result, the length of the arm piece 108 of the bonnet pivot support / connector 72 can be adapted to the extension extension width W of the extension extension 95, and the bonnet 25 can be pivotally supported and connected satisfactorily.

  In addition, the bonnet pivot / connector 72 has a short width specification in which the expansion adjustment part 150 is expanded and adjusted by setting the expansion adjustment width of the expansion adjustment part 150 large, and the extension extension body 95 is removed. It can be applied to both the bonnet 25 and the long-width bonnet 25 to which the extension extension 95 is attached.

  As shown in FIGS. 1, 8, and 12, the operation unit 5 is formed with a wheel support shaft insertion hole 130 in the rear center portion of the operation panel unit formation piece 136 of the dashboard 61, and the wheel support shaft insertion The upper end of the steering wheel support 131 protrudes from the hole 130, the steering wheel 132 is attached to the upper end of the steering wheel support 131, the driver's seat 133 is disposed at the rear of the steering wheel 132, and the driver's seat 133 Various control levers are arranged on the left and right sides of the.

  Then, step portions 134 and 134 are formed so as to project to the left and right outer sides at the left and right side positions of the mission portion 4 located between the steering wheel 132 and the driver's seat 133, and the rear wheels 10 are formed from the rear end portions of the respective step portions 134 and 134. , 10 rear wheel fenders 135, 135 are formed along the front upper peripheral surface of the vehicle.

  Further, as shown in FIG. 12, the operation panel portion forming piece 136 has one side of the virtual left and right center line C (right side in this embodiment) perpendicular to the axis of the steering wheel support shaft 131 and the front-rear direction. While the fuel gauge 140 as the instrument panel and the work system operation means 141 are centrally arranged, the steering system operation means 142 is concentrated on the other side of the virtual left and right center line C (left side in this embodiment). Yes.

  Here, as the work system operation means 141, an accelerator lever 143 for performing an acceleration / deceleration operation and a PTO switch 144 for performing a drive on / off operation of a PTO shaft (not shown) are provided on the right side of the virtual left-right center line C. It is concentrated in the direction.

  The steering system operating means 142 includes a direction indicator operation switch 145 for operating a direction indicator (not shown) and a headlight for turning on / off the headlight 146 (see FIG. 1). An operation switch 147 and an alarm operation switch 148 for operating an alarm device (not shown) are centrally arranged on the left side of the virtual left and right center line C.

  In this way, the fuel gauge 140 and the work system operating means 141 are centrally arranged on the right side of the virtual left and right center line C orthogonal to the longitudinal axis of the steering wheel support shaft 131. Thus, the operator who performs the steering operation can operate the work system operation means 141 with the right hand while holding the steering wheel 132 attached to the steering wheel support shaft 131 with the left hand.

  At this time, since the fuel gauge 140 and the work system operation means 141 are centrally arranged, the work system operation means 141 can be operated efficiently and appropriately, and the operability can be improved. When operating the means 141, the fuel gauge 140 can be easily viewed with the field of view in mind.

  In particular, the operability can be further improved by concentrating the accelerator lever 143 and the PTO switch 144 as the work system operation means 141 having relatively high operation frequency on the right hand side which is the dominant hand of the operator. A work implement lifting lever (not shown) is also arranged on the right hand side behind the driver's seat 133.

  Further, since the steering system operating means 142 is centrally arranged on the left side of the virtual left and right center line C, an operator who sits on the driving unit 5 and performs the steering operation attaches to the steering wheel spindle 131 with the right hand. The steering system operating means 142 can be operated with the left hand while the steering wheel 132 is held.

  At this time, since the direction indicator operation switch 145, the headlight operation switch 147, and the alarm operation switch 148 are centrally arranged as the steering system operation means 142 with relatively low operation frequency, these switches 145, 147, and 148 are efficiently and appropriately disposed. It can be operated and operability can be improved.

Side surface explanatory drawing of the tractor which concerns on this invention. The side view of a motor part. The perspective view from the front of a support body. The front view of a support body. The perspective view from the back of a support body. The battery installation explanatory perspective view. Battery installation side view. Side surface explanatory drawing of a support frame. The dashboard explanatory drawing to a support frame. The top view of a support frame. The perspective view of a support frame. The rear perspective view of a bonnet and a dashboard. Side surface explanatory drawing which shows the attachment structure of a bonnet and an extension extension body. Exploded perspective view showing the attachment structure of the bonnet and the extension extension. Sectional side explanatory drawing which shows the pivot support and connection structure of a bonnet. Cross-sectional plane explanatory drawing which shows the pivot and connection structure of a bonnet. Explanatory drawing which shows the pivot and connection procedure of a bonnet. Side surface explanatory drawing which shows the modification example of a bonnet pivot support and a coupling body.

Explanation of symbols

A Tractor 1 Airframe Frame 2 Motor part 3 Clutch part 4 Mission part 5 Driving part

Claims (2)

In the tractor in which the base end of the bonnet (25) covering the prime mover part (2) is removably pivoted and connected to the upper part of the bonnet support piece (66) formed in the rear portal structure .
A tractor that can be changed to a bonnet adapted to the long width specification by detachably attaching an extension extension (95) to the rear edge of the bonnet (25) formed to adapt to the short width specification,
Attach support / reinforcement body (100) formed in a rear view portal shape along the rear edge of the left and right side wall forming pieces (96, 96) and the ceiling part forming piece (97) of the bonnet (25). ,
A bonnet pivot support / connector comprising an arm piece (108) formed to extend backward to connect and support the bonnet support piece (66) to the bonnet support piece (66). Removably attach the body (72) and the extension extension body (95) formed along the rear edge of the bonnet (25),
The support / reinforcement body (100) supports the bonnet pivot / linkage body (72) and the extension extension body (95), and the rear edge of the bonnet (25) is reinforced. To tractor. Increasing設延length body (95) bonnet pivotally-connected body of the short-width specification was removed (72), additional extended body length of SL ago formed by distracted rearward arm pieces (108) (95) Make it shorter by the amplification extension width (W),
The tractor according to claim 1, wherein the bonnet pivot support / connector (72) and the extension extension (95) can be changed to change between the long width specification and the short width specification.

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