JP4689071B2 - Bonnet structure of tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a hood structure of a tractor.
[0002]
[Prior art]
Conventionally, there has been a publicly known technique for providing a bonnet at the front of the tractor body, storing an engine, a radiator, etc. inside to prevent and protect these devices from being exposed to the outside, and reducing noise. ing. The bonnet is configured to be openable and closable on the front side or the rear side of the machine body. By opening the bonnet, the above-described device housed inside can be inspected.
[0003]
A conventional bonnet structure will be described with reference to FIG. 6. The bonnet hood 108 is streamlined and formed in a gate shape in a rear sectional view, and its rear edge has a predetermined width. It is folded inward. Left and right hinge arm attachment pieces 108a and 108a are formed in the folded portion, and the hinge arms 138 and 138 can be fixed to the attachment pieces 108a and 108a by bolts or welding. On the other hand, a dashboard frame 136 having a front view portal shape is erected on an airframe frame (not shown), and hinge pins 139 are projected horizontally in advance on the left and right inner surfaces of the dashboard frame 136 so that the hinge arm The hinge pins 139 and 139 are inserted into the holes 138a at the tips of 138 and 138 so that the hood hood 108 can be rotated and opened around the hinge pins 139 and 139. The contour of the upper surface and the left and right side surfaces of the dashboard frame 136 is configured to be substantially continuous with the contour of the hood hood 108, thereby giving the viewer the impression of continuity and smartness at the front of the tractor. Is also widely practiced.
[0004]
[Problems to be solved by the invention]
However, in the conventional mounting configuration as described above, when the hood hood 108 is assembled to the dashboard frame 136, first, only one of the left and right hinge arms 138 and 138 is inserted into the corresponding hinge pin 139, and further, Two-stage assembly work is required, such as fixing the hinge arm 138 inserted through the other hinge pin 139 in advance to the hinge arm mounting piece 108a of the hood hood 108 by welding or the like. In addition, there are many parts such as fuel tanks arranged in the dashboard frame 136, and the assembly work such as passing the hole 138a of the hinge arm 138 through the pin on the inner surface of the dashboard frame 136, Such parts were in the way and were extremely difficult.
[0005]
Further, because the hood hood 108 must be opened and closed, the upper rear portion of the hood hood 108 cannot be made higher than the position of the hinge pin 139 as the pivot point. That is, if the rear surface of the upper surface of the hood 108 is made higher than the position of the hinge pin 139, the rear edge of the upper surface of the hood hood 108 will hit the dashboard frame 136 when the hood hood 108 is opened. It will not be possible. Because of such a limitation, in the configuration in which the hinge pin 139 as a pivot fulcrum is provided inside the dashboard frame 136 as shown in FIG. 6, the height of the rear upper surface of the hood hood 108 is too low because the position of the hinge pin 139 is low. As a result, the capacity of the hood hood 108 is limited.
[0006]
In addition, the tractor manufacturer may want to configure a lineup of various tractor models with different wheel bases (distance between front and rear axles). For example, in the case of a mid-mount mower type tractor having a mower in the abdomen, the wheel base must be enlarged in order to be able to mount a large mower. A simple tractor model group. In this case, conventionally, the entire bonnet structure including the hood is designed and manufactured for each tractor model in accordance with the wheel base, which increases the man-hours and costs for management.
[0007]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0008]
In claim 1, a gate-shaped dashboard frame (36) is fixed to an airframe frame (1) having a mounting portion for an engine (4), and the support body (53) fixed on the dashboard frame (36). ) Is provided with a hinge pin (39), and a bonnet hood (8) covering the engine (4) is provided in a tractor bonnet structure in which the front side of the machine body is freely opened and closed around the hinge pin (39). (53) is configured to be bilaterally symmetric in rear view, and has a flat base (54), and left and right pin supports (55, 55) and a decorative cover mounting body (projected from the upper surface of the base (54)). 56, 56) are extended upward, and the pin support (55, 55) supports the hinge pin (39, 39) at the upper end in the horizontal direction, with respect to the pin support (55, 55). The bonnet A hinge arm (38, 38) protruding rearward from the card (8) is made to extend along the upper side from the lower side, and the hinge arm (38, 38) is extended upward while being curved. A hole is formed in the tip, the hinge pin (39) is inserted into the hole in the tip of the hinge arm (38, 38) , a nut (60) is inserted in the decorative cover mounting body (56, 56) in the front-rear direction. The decorative cover (37) is configured to cover at least the upper side of the hinge pin (39) and open the front surface, and to cover the left and right side surfaces and the rear surface, and is suspended from the ceiling surface of the decorative cover (37). Jo to form a stay (58, 58), said stays (58, 58), by assembling bolt (59) from a substantially front to said nut (60), to the decorative cover mounting member (56, 56) Can be mounted It is.
[0009]
In claim 2, in the bonnet structure of the tractor according to claim 1, the decorative cover (37) has a lateral contour at a position where the decorative cover (37) is fixed on the dashboard frame (36). Is continuous with the side profile of the dashboard frame (36).
[0010]
The bonnet structure of the tractor according to claim 1, wherein the dashboard frame (36) includes a plurality of types of dashboard frames (36) having different front and rear widths, and the plurality of types of dashboards. By selecting one of the frames (36), it can be assembled into different foil-based tractors.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the invention will be described.
[0012]
FIG. 1 is an overall side view of a tractor having a bonnet structure of the present invention, and FIG. 2 is a partial cross-sectional view showing a configuration inside the bonnet. FIG. 3 is a rear sectional view of the front portion of the tractor. FIG. 4 is a partial cross-sectional view showing a state in which the hood hood is rotated and opened from the state of FIG. FIG. 5 is a partially enlarged sectional view showing a support structure of the hood hood.
[0013]
With reference to FIG.1 and FIG.2, the whole structure of the tractor provided with the mower in the lower abdominal part as an Example to which this invention is applied is demonstrated. As shown in FIG. 1, the tractor includes a body frame 1 arranged in the longitudinal direction of the body. As shown in FIG. 2, which is a partial cross-sectional view of the front part of the tractor, a stay 2. -The engine 4 is supported via 3 and the engine mounting part is comprised. A radiator 5 and a battery 6 (FIG. 2) are disposed in front of the engine 4, and a muffler 7 is disposed above the engine 4. As shown in FIG. 1, the front surface of these devices including the engine 4 is covered with a front cover 43, the lower side surface is covered with a side cover 44, and the upper and upper side surfaces are bonnet hoods 8 according to the bonnet structure of the present invention. Covered with
[0014]
As shown in FIG. 2, a flywheel 9 is fixed to the crankshaft of the engine 4, and the flywheel 9 rotates via the universal joint 10 and the connecting shaft 11 as shown in FIG. 1. Is transmitted to the transmission 12 fixed to the rear end. As shown in FIG. 1, a rear axle 13, a front wheel output shaft 14, and a rear PTO shaft 15 are supported by the transmission 12, and the power of the engine 4 is shifted and then transmitted to these shafts. A rear wheel 16 is provided at the outer end of the rear axle 13.
[0015]
As shown in FIG. 1, a bracket 24 is disposed at the front of the body frame 1, and a front axle case 17 is suspended from the bracket 24. The front axle case 17 supports a front axle 23, and a front wheel 18 is fixed to the outer end of the front axle 23. The rotation of the front wheel output shaft 14 of the transmission 12 is input to the front axle case 17 through the universal joints 19 and 19 and the propeller shaft 20 to drive the front wheel 18.
[0016]
The fuselage frame 1 has a configuration in which plate-shaped left and right side plates are connected by a plurality of crossbars 25. Further, as shown in FIG. It is installed. A steering column 27 is erected on the upper surface of the steering column mounting frame 26, and a steering handle 28 is attached to the upper end of the steering column 27. Steps 21 for getting on and off are arranged on the left and right of the middle part of the machine body frame 1.
[0017]
A three-point link mechanism 29 is provided at the rear of the tractor so that the work machine can be connected. A hydraulic lift device 30 is provided on the upper surface of the transmission 12, and the height of the work implement can be changed by driving the lift arm 31 up and down. An operator seat 22 is provided on the upper surface of the hydraulic lift device 30. The abdomen of the tractor is provided with a mower 32 and is driven by the power of the mower drive take-out shaft 33 provided on the lower surface of the transmission 12.
[0018]
As shown in FIG. 1, an HST (hydrostatic transmission) 34 as a main transmission mechanism is disposed on the front side of the transmission 12, and its input shaft 35 protrudes horizontally toward the front. The tip of the input shaft 35 is linked to the flywheel 9 of the engine 4 via the universal joints 10 and 10 and the connecting shaft 11 as described above. The rotation of the flywheel 9 is continuously variable by the HST 34, further shifted through the auxiliary transmission mechanism of the transmission 12, and transmitted to the rear axle 13, the rear PTO shaft 15, and the like.
[0019]
As shown in FIG. 2, a dashboard frame 36 is erected on the airframe frame 1 so as to stand upright in a side view, and a dashboard 42 is attached to a rear edge of the dashboard frame 36, so that the steering column described above is provided. The mounting frame 26 and the steering column 27 are covered. As shown in FIG. 3, the dashboard frame 36 is configured in a rear view, and a parking brake lever 45 and a cruise control lever 46 are provided on the rear surface of the dashboard 42 (the surface facing the operator seated on the seat 22). They are arranged side by side. As shown in FIG. 2, a fuel tank 52 is supported in a non-movable manner in the rear upper part of the internal space covered by the hood hood 8 and the dashboard frame 36. A protruding fuel filler port is formed on the upper surface of the fuel tank 52, and the fuel filler port is closed by a cap 51.
[0020]
From the rear inner surface (ceiling surface) of the bonnet hood 8, screw bosses 8a and 8a are formed in a hanging shape, and a substantially rectangular plate-like substrate 47 is screwed to the screw boss 8a. A hinge arm 38 is integrally formed at the rear end of the substrate 47. The hinge arm 38 is pivotally supported by a hinge pin 39, which will be described later, so that the hood hood 8 can be rotated and opened around the hinge pin 39. Yes. A hole 47a is formed in the substrate 47, and as shown in FIG. 2, the fuel supply port of the fuel tank 52 is positioned in the hole 47a with the hood hood 8 closed. A rod mounting stay 48 is formed at an appropriate position of the substrate 47, and one end of a stand rod 49 is pivotally supported on the rod mounting stay 48. On the other hand, a vertical and inclined rail 50 is fixed at an appropriate position inside the bonnet. A substantially inverted “J” -shaped guide groove is cut out on the rail 50, and the other end of the stand rod 49 is connected to the rail 50. It is attached so as to be slidable along the guide groove.
[0021]
In such a configuration, when the front end of the hood hood 8 is lifted by hand, the stand rod 49 is pulled upward via the rod mounting stay 48, and the lower end of the stand rod 49 extends in the guide groove of the rail 50. The operator slides upward, and at the most open position, the operator pulls the middle part of the stand rod 49 toward the front and causes the lower end of the operator to enter the bent portion of the upper end of the guide groove. It is locked in the open state shown in FIG. On the other hand, in order to release the locked state, the hood hood 8 is lifted by a small amount, the stand rod 49 is pushed backward, and its lower end is allowed to escape from the bent portion of the guide groove. When the hood hood 8 is lowered from this state, the stand rod 49 does not stretch, and the lower end of the stand rod 49 slides down the guide groove, and the hood hood 8 is closed.
[0022]
However, it is not restricted to the above structure, For example, it can also comprise as follows. That is, the rail 50 is omitted, and a biasing spring is attached to the upper end of the stand rod 49 so that a counterclockwise biasing force in FIG. On the other hand, on the front surface of the slanted hot air shielding plate covering the front surface of the fuel tank 52, a stand is separately fixed (not shown), and the middle portion of the stand rod 49 is inserted into the opening of the stand. To do. With this configuration, the urging force in the right direction in FIG. 2 is applied to the stand rod 49, and when the hood hood 8 is opened and closed, the stand rod 49 moves up and down while being guided by the edge of the opening of the strut base. . In addition to the opening, a groove is provided on the projecting base so that the lower end of the stand rod 49 can be engaged with and disengaged from the groove. Therefore, when the bonnet hood 8 is opened, the stand rod 49 can be stretched by being locked by engaging the lower end of the stand rod 49 with the groove of the projecting base, and can be locked in the opened state. When the hood 8 is closed, the lower end of the stand rod 49 may be removed from the groove. Since this structure can omit the rail 50, there is an advantage that it can contribute to the reduction of the manufacturing cost.
[0023]
A configuration for supporting the bonnet hood 8 so as to be freely pivotable will be described. A support 53 as a support portion is fixed on the upper surface of the dashboard frame 36, and the support 53 is configured symmetrically in a back view as shown in FIG. 3, and includes a flat base 54 and the base Pin support bodies 55 and 55 projecting on the upper surface of 54 and decorative cover mounting bodies 56 and 56 are provided. The pin supports 55 and 55 extend upward along the hinge arms 38 and 38, and support the hinge pins 39 and 39 horizontally on the upper ends thereof. As shown in FIG. 4 and FIG. 5, each of the hinge arms 38 extends upward while being curved, and a hole is formed at the tip thereof, and the hinge pin 39 is inserted into the hole, so that the hood hood 8 Is supported around the hinge pin 39 so as to be freely rotatable. As described above, since the hinge pin 39 is disposed above the dashboard frame 36, the operation of assembling the hinge arm 38 of the bonnet hood 8 to the hinge pin 39 is easy. Furthermore, since the height of the hinge pin 39 can be made higher than the position of the upper surface of the dashboard frame 36, the height of the rear portion of the upper surface of the bonnet hood 8 can be increased. As a result, the capacity of the bonnet can be increased.
[0024]
Then, in order to improve the appearance by covering the hinge arms 38 and 38 and the hinge pins 39 and 39, the decorative cover 37 is provided on the dashboard frame 36 so as to cover the upper sides of the pin supports 55 and 55. It is attached. The decorative cover 37 is formed by molding a synthetic resin. The shape of the decorative cover 37 is substantially arched when viewed from the back, and the front surface is opened, while the left and right side surfaces and the rear surface are covered. The contour line of the front end of the decorative cover 37 is configured to match the contour line of the rear end of the hood hood 8 in the closed state, and the seam between the bonnet hood 8 and the decorative cover 37 is not stepped. Is secured. Further, as shown in FIG. 3, the decorative cover 37 is configured such that the side contour thereof is continuous with the side contour of the dashboard frame 36, and the joint between the decorative cover 37 and the dashboard frame 36 is formed. It is stepped so as not to stand out.
[0025]
From the ceiling surface of the decorative cover 37, stays 58 and 58 are formed in a hanging shape, while a nut 60 is welded to the rear surfaces of the decorative cover mounting bodies 56 and 56. Then, the lower portions of the stays 58 and 58 are attached to the upper portions of the decorative cover attachment bodies 56 and 56 by screwing bolts 59 as fasteners to the nut 60, respectively.
[0026]
As shown in FIG. 5, the bolt 59 is attached so that its head is on the front side, and the stay 58 is fastened to the decorative cover attaching body 56 by assembling the bolt 59 from the front, and the decorative cover 37 is attached. It can be assembled. Therefore, in order to assemble the decorative cover 37 in the configuration of the present embodiment, after the hood hood 8 is attached, the hood hood 8 is rotated as described above and locked in the open state, and the bolt 59 is assembled from the front in this state. It can be done and is easy to assemble. In the present specification, the “fastener” broadly means a part having a function capable of attaching and fixing a certain member to another member. Therefore, not only the bolt 59 of the present embodiment but also various things such as screws and pins are included in the “fastener”.
[0027]
The dashboard frame 36 (and the decorative cover 37) are manufactured with various front and rear widths corresponding to the tractor specification lineup with different wheel bases. And a dashboard frame 36 having various front and rear widths can be used in combination to meet the specifications of a plurality of tractors. The tractor shown in FIG. 7 has a wheel base W ′ larger than the wheel base W of the tractor shown in FIG. 1 so that a larger mower 32 ′ than the mower 32 shown in FIG. 1 can be mounted (W ′>). W). In this case, as the bonnet structure, a dashboard frame 36 ′ having a front / rear width L ′ larger than the front / rear width L ′ of the dashboard frame 36 of FIG. By attaching the same hood hood 8 and attaching the decorative cover 37 ′ having the front and rear width L ′, it is possible to cope with the expansion of the wheel base (from W to W ′).
[0028]
Although the embodiments have been described above, the technical scope of the present invention is not limited to the above-described embodiments, and the technical idea that the present invention is truly intended to be clarified from the matters described in this specification and the drawings. It extends over the entire range.
[0029]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0030]
As shown in claim 1, a gate-shaped dashboard frame (36) is fixed to an airframe frame (1) provided with a mounting portion for an engine (4), and a support body fixed on the dashboard frame (36) ( 53) provided with a hinge pin (39), and a hood structure of a tractor in which a hood hood (8) covering the engine (4) is provided around the hinge pin (39) so that the front side of the machine body can be opened and closed. The body (53) is configured to be bilaterally symmetric when viewed from the back, and has a flat base (54), and left and right pin supports (55, 55) and a decorative cover mounting body projecting from the upper surface of the base (54). (56, 56) is extended upward, and the pin support (55, 55) supports a hinge pin (39, 39) at the upper end in the horizontal direction, with respect to the pin support (55, 55). The bonnet A hinge arm (38, 38) protruding rearward from the card (8) is made to extend along the upper side from the lower side, and the hinge arm (38, 38) is extended upward while being curved. Since a hole is formed at the tip and the hinge pin (39) is inserted into the hole at the tip of the hinge arm (38, 38), the hinge pin is disposed above the dashboard frame. Is easy to assemble so that it can be opened and closed around the hinge pin.
Furthermore, since the height of the hinge pin can be increased, the height of the rear portion of the upper surface of the bonnet hood can also be increased, and as a result, the accommodation volume can be increased.
[0031]
Further , a nut (60) is erected in the front-rear direction on the decorative cover mounting body (56, 56) , and the decorative cover (37) covers at least the upper side of the hinge pin (39) and opens the front surface, It is configured to cover the left and right side surfaces and the rear surface, and the stays (58, 58) are formed in a hanging manner from the ceiling surface of the decorative cover (37) , and the stays (58, 58) are bolted to the nut (60). (59) by the assembled substantially from the front, since the attachable to said decorative cover mounting member (56, 56), because it is fitted with a decorative cover by mounting the fastener from the front of the space, labor of assembling Less work is required and man-hours can be reduced.
[0032]
As shown in claim 2, in the bonnet structure of the tractor according to claim 1, the decorative cover (37) has a side portion at a position where the decorative cover (37) is fixed on the dashboard frame (36). Since the contour is continuous with the side contour of the dashboard frame (36), the support portion including the hinge pin can be concealed so as not to be exposed to the outside, and the appearance is beautiful. Furthermore, since the side contour of the decorative cover is continuous with the side contour of the dashboard frame, the joint between the decorative cover and the dashboard frame is inconspicuous in a side view, and the appearance is hardly impaired.
[0033]
As shown in claim 3, in the bonnet structure of the tractor according to claim 1, the dashboard frame (36) is provided with a plurality of types of dashboard frames (36) having different front and rear widths, and the plurality of types of dashboard frames (36). By selecting one of the board frames (36), it is possible to assemble the tractors with different foil bases, so that the wheel base can be changed only by varying the width of the dashboard frame. There is no need to design and manufacture each hood, which can contribute to management man-hours and cost reduction.
[Brief description of the drawings]
FIG. 1 is an overall side view of a tractor having a bonnet structure according to the present invention.
FIG. 2 is a partial cross-sectional view showing a configuration inside a bonnet.
FIG. 3 is a rear sectional view of the front part of the tractor.
4 is a partial cross-sectional view showing a state in which a hood hood is rotated and opened from the state of FIG.
FIG. 5 is a partially enlarged sectional view showing a support structure of the hood hood.
FIG. 6 is a perspective view showing a state of assembling a conventional bonnet hood.
FIG. 7 is a diagram in which the bonnet structure of the present invention is applied to a tractor having a large wheel base.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Airframe frame 4 Engine 8 Bonnet food 36 Dashboard frame 37 Cosmetic cover 39 Hinge pin 53 Support part

Claims (3)

A gate-shaped dashboard frame (36) is fixed to an airframe frame (1) having an engine (4) mounting portion, and a hinge pin (39) is fixed to a support (53) fixed on the dashboard frame (36). A hood structure of a tractor in which a hood hood (8) covering the engine (4) is provided to be openable and closable around the hinge pin (39), and the support body (53) is rear view The left and right pin support bodies (55, 55) and the decorative cover mounting body (56, 56) projecting upward from the upper surface of the base section (54) The pin support (55, 55) supports a hinge pin (39, 39) at the upper end in the horizontal direction, and the hood hood (8) is supported with respect to the pin support (55, 55). ) From the back The protruding hinge arms (38, 38) are made to extend upward from below, and the hinge arms (38, 38) are extended upward while being curved, forming a hole at the tip thereof, the hole of the tip of the hinge arm (38, 38), said inserting the hinge pin (39), the decorative cover mounting body (56, 56) the nut (60), erected toward the front-face cover (37) covers at least the upper part of the hinge pin (39), opens the front surface, and covers the left and right side surfaces and the rear surface. The stay (58, 58) is suspended from the ceiling surface of the decorative cover (37 ). is formed and the stays (58, 58), by assembling bolts (59) the the nut (60) from substantially the front, and characterized in that a attachable to said decorative cover mounting member (56, 56) Torak Bonnet structure of.   The hood structure of the tractor according to claim 1, wherein the decorative cover (37) has a side profile thereof in the dashboard frame (37) at a position where the decorative cover (37) is fixed on the dashboard frame (36). 36) A bonnet structure of a tractor characterized by being continuous with the side contour of   The bonnet structure of a tractor according to claim 1, wherein the dashboard frame (36) includes a plurality of types of dashboard frames (36) having different front and rear widths, and one of the plurality of types of dashboard frames (36). The bonnet structure of the tractor, which can be assembled into different foil-based tractors by selecting one.

Images