JPH022705Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a wheel support device for a crawler traveling device in a work vehicle using a crawler, such as a combine harvester.

<Prior Art> Conventionally, the above-mentioned wheel support device for a working vehicle has a wheel shaft rotatably attached to a housing that is integrally welded to a running section frame, and a wheel shaft that is integrally or detachably attached to both ends of the housing. It is generally known that wheels can be attached to the wheels, and among these, the one with a structure that allows the wheels to be attached and removed is, for example, the Utility Model 57-5258.
As shown in Japanese Patent Application No. 56-29276, a structure is known in which bolts and nuts for fastening the wheels protrude from the sides of the wheels due to constraints on the width of the wheels.

<Problems to be solved by the invention> In the case of the above-mentioned conventional mounting devices, grain rods, grass, etc. may get caught on the bolts or nuts protruding from the side of the wheel during running, causing entanglement, or Combine harvesters and the like not only knock down or damage the grain rods that will be harvested next, but also pose problems such as danger to the clothes of workers near the machine and damage to their clothes.

In addition, in the above-mentioned conventional wheel support structure, the wheel and shaft fit closely together within a fixed width of fitting, so for example, the distance between the contact surface of the crawler wheel and the center of the wheel shaft depends on the road surface conditions. If the crawler has become narrow due to deformation, etc., or if the contact surface of the crawler's rolling wheels is inclined with respect to the axis, there is a problem that the rollers cannot be fitted in the direction along the axis, and the crawler's If it is difficult to align the axes completely due to inclination or misalignment of the guide protrusion to prevent detachment, or if the tightening bolt is in a position that does not protrude outward from the wheel hub, etc. It was necessary to move the crawler until the requirements were satisfied.

<Measures to improve the problem and unresolved problems> To solve this problem, a device with a mechanism as shown in Fig. 6 can be considered, but to briefly explain this device here, A wheel shaft 10 is rotatably supported in a housing 8 in which the tips of the front and rear support arms 4 are supported by a shaft 6 inside a partially open end.
2 and 12 are fitted together to rotate together with the shaft. The wheel 12 is divided into a plurality of pieces (in the drawing, two semicircular divided pieces 12a and 12b), and the boss portion 12c is held in the wheel fitting margin 10a, which is formed with a predetermined width. A collar-shaped ring 16 is attached to the stepped portion 14 at the outer end of the outer periphery of the wheel 12.
are fitted into two divided pieces 12a and 12b.
constitutes one roller 12, and has a structure that allows it to be attached to and detached from the shaft 10 without requiring sliding fitting in the axial direction. 1
8 is a C ring forming a stopper of the collar-shaped ring 16, and 20 is a C ring also attached to the boss portion 12c.

Of the above-mentioned wheels 12, 12, the wheel 1 on the outside of the aircraft body
2, for the purpose of maintaining stability by lowering the center of gravity of the aircraft, or by changing the center of gravity due to the installation of various working parts, storage parts, etc., or generally lowering the center of gravity of the aircraft,
A donut-shaped balance weight 22 made of cast iron or the like is fitted so that the left and right or front and rear balance can be adjusted, and is detachably attached to the wheel 12 with bolts 24.

The rollers 12, 12 are provided with a large number of guide protrusions 2 protruding from the center of the inner periphery of the crawler 26 in two rows.
8 and 28 and contact the inner surface of the crawler 26 to guide the crawler while preventing its lateral movement. Further, between the two rows of guide protrusions 28, 28, as shown in FIG. 5, a sled-shaped guide 30 that slides against the crawler and prevents the crawler from coming off is accommodated in the front-rear direction. The lower end of a guide rod 32, which is inserted into and supported by the support arm 4 so as to be able to rise and fall freely, is fixed to the front and rear ends of the guide 30.
A spring 34 is mounted on the guide rod 32 between the
The roller 26 is constantly pressed against the inner surface of the crawler 26 to prevent the crawler from coming off between the roller shafts. With this mechanism, the detachment prevention guide can be attached simply by providing a guide rod insertion hole in the wheel attachment portion of the support arm or the like.

In addition, a crawler 2 is placed at an appropriate position on the frame 2.
The upper roller 36, which is inscribed only in the inner circumferential surface of the guide projections 28, 28 on the inside of the body, is rotatably supported by a cantilever support structure via a bracket 38. Regardless of the installation position (see Figure 3), that is, the upper roller 3
The adjustment bolt 41 for adjusting the crawler tension can be freely adjusted using a spanner or the like without being hindered by the screws 6.

With the above mechanism, there are problems when the fastening bolts and nuts of the roller protrude greatly from the side of the roller, or when the roller shaft is slightly misaligned or tilted with respect to the inner surface of the crawler. However, if the inclination of the roller axis is large with respect to the inner surface of the crawler, it is difficult to install the roller, and there are other problems such as an increase in the number of parts of the roller. left behind.

<Means for Solving the Problems> The device of the present invention for solving the above problems has a housing 27 attached to the frame 23.
A wheel shaft 25 is rotatably supported within the wheel shaft 2.
In the structure in which the boss portion 47 of the roller wheel 9 is inserted into the bolt 45 protruding from the end of the wheel 5 and is fastened and fixed with the mounting nut 51, the insertion hole 49 of the boss portion 47 is made larger than the diameter of the bolt 45 to form the boss. The inner and outer surfaces of the boss portion 47 and the contact surface of the mounting nut 51 that contact the outer surface of the boss portion are tapered surfaces that widen toward the outer surface, and when the mounting nut 51 is tightened, The inner end surface of the boss portion 47 is positioned by contacting the end surface 26 of the wheel shaft 25, and furthermore, within the housing 27, a pressing portion 57a at the outer end is elastically attached to the inner surface of the boss portion 47. It is characterized by being fitted with a seal body 57 that is pressed into contact.

<Operation> When the bolt of the wheel axle is inserted into the boss of the wheel and the wheel is tightened with a nut, the tapered surface of the boss of the wheel is aligned with the tapered surface of the nut that is aligned with the axis of the wheel axle. The rollers are guided and fixed in such a way that they are always aligned with the axis of the roller shaft by tightening the nuts, and by setting the dimensions of the tightening bolts and nuts and the boss of the roller wheel. Bolts and nuts can always be housed within the outer surface of the wheel.

<Embodiment> To explain in detail the embodiment of the present invention shown below, FIG. 2 shows an overall perspective view of a combine harvester, which has a running section 3 at the bottom of the machine body 1, and the running section 3 is connected to drive wheels at the front and rear ends. 5. The crawler 11 is supported by the driven wheel 7 and the intermediate roller 9. There is a pre-processing section 13 at the front of the machine body 1, and from the front end of the lower part of the pre-processing section 13, the tips of left and right dividers 15, 15 and a middle divider 17 between them protrude. A bumper 19 is detachably attached to the vehicle to maintain safety when driving on the road.

The bumper 19 is made of a rod-shaped body or a plate-shaped body,
At both ends of the back side, there are hook-shaped attachment parts 19a, 19a whose tips are both bent in either the left or right direction.
Furthermore, an engagement hole 19b is provided at the end of the bumper 19 to fit into a bolt head or nut, and this engagement hole 19b can be used to rotate the bolt, for example, as shown in FIG. It has a structure that can be used as a wrench.

On the other hand, the mounting portions 19a, 19a are inserted from the sides into the tips of the dividers 15, 15, and the bumper 19
Attachment holes 21, 21 for attaching to the divider
are perforated in each case. Attachment part 1 of the bumper 19
At least one of the bumpers 9a is provided with a set hole 19c into which a pin or the like is inserted after the bumper 19 is attached to the dividers 15, 15 to prevent the bumper 19 from falling off (see FIG. 6).

In the traveling section 3, an endless belt crawler 11 is wound around a driving wheel 5 at one end and a driven wheel 7 at the other end of a frame 23 of the traveling section, which is integral with the frame of the aircraft body 1. The rolling wheels 9 are fitted and attached to both ends of housings 27 fixed to the frame 23 at predetermined intervals and a rolling shaft 25 rotatably supported by each housing 27.

The drive wheel 7 is pivotally supported by a movable bearing 29 provided at one end of the frame 23, and a plurality of parallel guide rods 31, 33 are protruded from inside the movable bearing 29 (on the drive wheel side). 3
1 and 33 are both slidably inserted into and supported by a support bracket 35 fixed to the frame 23. One guide rod 31 is attached to the support bracket 3
A female threaded portion 39 is provided at the tip of the sleeve 37, and an adjustment bolt 41 is screwed into this female threaded portion 39 from the outside, and the tip of the sleeve 37 is inserted into the sleeve 37 fixedly attached to the sleeve 3.
The mechanism is such that the distance between the axes of the driving wheel 5 and the driven wheel 7 (that is, the tension or loosening of the crawler 11) can be adjusted by adjusting the adjustment bolt 41. Reference numeral 36' denotes an upper roller wheel rotatably supported in a cantilever structure via a bracket 38' attached to the frame 23, which supports the upper side of the crawler 11 (the upper roller wheel in Fig. 6). Same as wheel mounting structure).

The wheel shaft 25 is rotatably supported within the housing 27 via a bearing 43 , and bolts 45 for mounting the wheel are protruding from both ends of the wheel shaft 25 . Install the wheel so that it is loosely inserted into the insertion hole 49 at the center of the
A mounting nut 51 is screwed and tightened from the outer end of the bolt 45. At this time, the inner end surface 48 of the boss portion 47 is positioned by coming into contact with the shaft end surface 26 of the rolling wheel shaft 25, and the mounting nut 51 and the tapered surface of the boss portion 47 contact and fit with each other, so that the rolling wheel 9 and the rolling wheel shaft 25 are aligned. The axes of the will automatically match.

That is, the inner surface of the boss portion 47 and the outer surface which is the contact surface with the nut 51 are both tapered surfaces 53a, 5.
3b or 51a, and when the nut 51 is tightened, the wheel 9 is always fixed to the bolt 45 and the wheel shaft 25 concentrically. Also, the mounting nut 5
1 is largely recessed into the boss portion 47, and the boss portion 47 is recessed into the sleeve 55 of the housing 27, so that a structure that does not protrude from the outer surface of the wheel 9 can be achieved.

Between the inner tapered surface 53a of the boss portion 47 in the sleeve 55 and the bearing 43, the outer circumferential surface fits into contact with the inner circumference of the sleeve 55, and the inner circumference is elastically pressed against the circumferential surface of the roller shaft 25. A seal body 57 made of an elastic member is fitted, and a ring-shaped pressing portion 57a that is resiliently pressed against the tapered surface 53a of the boss portion 47 projects on the outer end surface of the seal body 57. The diameter of the pressing portion 57a is expanded by invading the boss portion 47, and its sealing performance is improved, and the sealing body 57 is
Therefore, the structure has at least three seal portions.

Furthermore, as a result of the boss portion 47 being recessed into the sleeve 55, the tip of the sleeve 55 is covered with a groove-shaped recess 59 formed on the inner surface of the roller 9, and the gap between the grooves can be kept very small, so that no leakage from the outside can occur. The structure is designed to prevent the intrusion of coarse dust, stones, soil, etc.

The rollers 9, 9 are provided with guide protrusions 61, 6 integral with core metals 63 provided in two rows on the inner surface of the crawler 11.
A guide mounting portion 6 is installed inside the crawler 11 on the outside of the crawler 11 so as to sandwich the guide mounting portion 6 , and protrudes between the guide protrusions 61 at the lower end of the housing 27 .
5 is provided in a protruding manner, and the guide mounting portion 65
A mounting surface 67 that is a circular groove extending in the front and back direction is formed on the lower surface of the holder. A sled-shaped detachment prevention guide 69 made of a bar with a circular cross section and whose circumferential surface fits into the circular groove is attached to the mounting surface 67 by means of mounting bolts 71. Reference numeral 72 denotes a mounting bolt hole that penetrates into the housing from the guide mounting portion 65.

As shown in FIG. 3 or 4, the detachment prevention guide 69 is installed between the plurality of housings 27 and its both ends are fastened and fixed, and at that time, the bolt tightening part is connected to the detachment prevention guide. The recess 73 is formed so as not to protrude from the lower surface of the recess 69 . 75 are guide protrusions 69, 69 of the crawler 11
This is a spanner for attaching and detaching the mounting bolt 71 through the locking hole 77 of the drive wheel 5 bored therebetween.

The crawler 11 consists of a main body part 79 made of hard rubber on the inner circumferential side that covers the core bar 63, and lugs 83 and 85 that are protruded from the bottom surface (outer circumferential surface) of the main body part 79 to the left and right, leaving a central part 81. Then, the lag 8
3 and 85 have different structures on the inside and outside of the fuselage 1. That is, the lug 85 on the outside of the fuselage is connected to the main body 79.
The inner lug 83 has a medium hard layer 83a having a slightly soft elasticity on the outer peripheral surface of the main body part 79, and a soft layer 83b made of a softer elastic material on the outer peripheral surface. are successively laminated, and the entire lug 85 is made to protrude higher than the outer lug 85.

As a result, when the machine body 1 runs on a hard road surface such as asphalt, the inner lug 83 deforms due to the weight of the machine as shown by the imaginary line in FIG. 1, but its height is higher than the protruding height of the outer crawler 85. Since this prevents the grounding, the inside lug 8 should be rotated when the aircraft is running.
The small turning radius enables quick and tight turning.

Further, as shown in the figure, when the center side of the soft layer 83b is made higher while being inclined, the end portion thereof is inserted so as to flow into the center-to-center portion 81 due to pressure deformation.
This prevents solid objects such as stones and pieces of wood from being inserted into the center portion 81.

On the other hand, when the above-mentioned lug 83 travels in a soft field such as a field, the crawler itself digs deeply into the field, so the outer lug 83 also touches the ground, which does not impede the crawler's ability to prevent collapse, and reduces the ground pressure. The strong inner crawler 83 also maintains the effect of reducing the traveling radius.

<Effects of the invention> As a result of the above-mentioned structure of this invention, it is possible to eliminate the dangers and operational troubles caused by mounting bolts and nuts protruding from the side surfaces of the running wheels in various work vehicles, and also to eliminate Even if the lower circumferential surface of the roller is stuck on the inner surface of the crawler and is difficult to enter due to road surface conditions, etc., tilt the roller 9 as shown in Figure 1 and attach the bolt of the roller axle to the roller hub. It can be installed by inserting the wheel and tightening the nut, which has the advantage of automatically aligning the axes of the shaft and the wheel.

In addition, because the structure is such that almost the entire boss portion of the wheel is accommodated within the end surface of the housing, the end surface of the housing (sleeve) is covered with the inner surface of the wheel, and the
Since the gap can be made smaller, it has the effect of creating a structure that prevents the intrusion of coarse gravel, earth clods, etc.

Furthermore, by making the housing-side surface of the boss part a tapered surface, it is possible to increase the number of contact points with the seal body inside the housing and to obtain a complete sealing structure, which improves sealing performance such as dustproofing and waterproofing. This is accompanied by the effect of

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main parts of the device of the present invention, Fig. 2 is an overall perspective view of the combine, Fig. 3 is a side view of the running section, and Fig. 4 is a partial side view showing the crawler guide mechanism of the running section. 5 and 6 are a partial side view and a cross-sectional view of a running section of an example of a device conceived prior to the device of the present invention. 9: Roller, 11: Crawler, 23: Frame,
25: Roller shaft, 26: Shaft end surface, 27: Housing, 45: Bolt, 47: Boss portion, 48: Inner end surface, 49: Insertion hole, 51: Mounting nut, 51a,
53a, 53b: Tapered surface, 61: Guide protrusion, 65: Guide attachment portion, 69: Dislodgement prevention guide, 73: Recessed portion.

Claims (1)

[Scope of utility model registration request] A wheel shaft 25 is rotatably supported in a housing 27 attached to the frame 23.
The boss portion 4 of the wheel 9 is attached to the bolt 45 protruding from the end of the
In the structure in which the bolt 4 is inserted through the bolt 4 and fastened and fixed with the mounting nut 51, the insertion hole 49 of the boss portion 47 is inserted into the bolt 4.
The inner and outer surfaces of the boss portion 47 and the contact surface of the mounting nut 51 that contact the outer surface of the boss portion are tapered surfaces that widen toward the outer surface. , when the mounting nut 51 is tightened, the inner end surface of the boss portion 47 contacts the end surface 26 of the wheel shaft 25 and is positioned; A rolling wheel support device for a crawler traveling device, in which a seal body 57 that is elastically pressed against the inner surface of a portion 47 is fitted.