JP2020079049A - Mounting fixture for auxiliary wheel of auxiliary wheel for farm tractor - Google Patents

Abstract

To solve the problem that a conventional tractor is configured so that an engagement hook provided at an auxiliary wheel side is moved along a shaft center direction of a tractor wheel to be engaged to and disengaged from an engagement beetle at the tractor wheel side, so that engagement of the engagement hook with the engagement beetle is loosened during work using the tractor.SOLUTION: A mounting fixture G for an auxiliary wheel of an auxiliary wheel for a farm tractor, which mounts an auxiliary wheel S on a tractor wheel 1, is constituted of an inner mounting fitting A having an engagement beetle 6 to be mounted on outside of a wheel 1 made of rubber of a farm tractor and an outer mounting fitting B that has an engagement hook 29 that engages with the engagement beetle 6 of the inner mounting fitting A and is detachably attached to the auxiliary wheel S made of metal. The engagement hook 29 is configured to be moved with a round handle 28 to the engagement beetle 6. The mounting fixture G for an auxiliary wheel is provided with an auxiliary wheel loosening prevention mechanism 35 that prevents the round handle 28 from rotating so as to prevent the engagement of the engagement hook 29 with the engagement beetle 6 from loosening.SELECTED DRAWING: Figure 3

Description

The present invention relates to an auxiliary wheel mounting tool for an agricultural tractor auxiliary wheel.

Conventionally, a tractor has auxiliary wheels mounted on the outside of wheels for traveling on a road and travels in a paddy field to cultivate.
This auxiliary wheel is configured to have an inner mounting bracket that is mounted on the outside of the wheel of the agricultural tractor wheel, a metal auxiliary wheel, and an outer mounting bracket that is mounted on the inner mounting bracket. The engaging hooks of the outer mounting brackets fixed to the inside and the auxiliary wheels are engaged with the engaging rods of the mounting brackets, and the engaged engaging hooks are moved to the outside by the handle so that the outer mounting brackets and the auxiliary wheels. And the wheel are integrally fixed to the inner mounting member in a fixed state (see Patent Document 1).

JP-A-59-23701

In the above-mentioned known example, by rotating the round handle, the engagement hook provided on the auxiliary wheel side is moved along the axial direction of the tractor wheel to engage/disengage with the engagement rod on the tractor wheel side. Therefore, there is a problem that the engagement between the engagement hook and the engagement rod is loosened during the tractor work.
The present invention has a simple structure and prevents the auxiliary wheels from being loosened.

According to the invention of claim 1, an inner mounting bracket A having an engaging rod 6 mounted on the outer side of a rubber wheel 1 of an agricultural tractor, and an engaging hook 29 engaging with the engaging rod 6 of the inner mounting bracket A. And an outer mounting bracket B which is detachably attached to the auxiliary wheel S made of metal and constitutes an auxiliary wheel mounting tool G for attaching the auxiliary wheel S to the tractor wheel 1, and the engaging hook 29 has a round handle 28. To move with respect to the engaging rod 6 and prevent the round handle 28 from rotating on the auxiliary wheel mounting device G, so that the engagement between the engaging hook 29 and the engaging rod 6 is loosened. The auxiliary wheel loosening prevention mechanism 35 for preventing the above is provided as an auxiliary wheel attachment for an auxiliary wheel for an agricultural tractor.
According to a second aspect of the invention, the auxiliary wheel loosening prevention mechanism 35 is configured such that the pair of leg portions 36 inserted into the advancing/retreating rod 27 to which the round handle 28 is attached and the shaft cylinder 37 provided on the leg portion 36, Auxiliary wheel mounting of an auxiliary wheel for an agricultural tractor, which is configured by an engaging position that engages with the spoke portion 39 of the round handle 28 and an engaging body 38 that is movably provided between a retracted position that does not contact the spoke portion 39. It is a tool.
According to a third aspect of the present invention, a stopper 48 for retaining is formed at one end of the engaging body 38, and a stopper pin 49 for retaining is detachably attached to the other end of the engaging body 38, and the stopper 37 of the shaft cylinder 37 is attached. An engaging insertion hole 46 is formed on the round handle 28 side for engaging with an engaging pin 40 for holding the engaging body 38 at an engaging position for engaging the spoke portion 39, and the shaft cylinder 37 is provided on the tractor wheel 1 side. Is an auxiliary wheel mounting device for an auxiliary wheel for an agricultural tractor in which an evacuation insertion hole 47 with which an engagement pin 40 for holding the engagement body 38 in a non-contact state with the spoke portion 39 is formed.

In the invention of claim 1, the auxiliary wheel loosening prevention mechanism prevents the engagement of the engagement hook 29 and the engagement rod 6 from being loosened by preventing the round handle 28 from rotating on the auxiliary wheel attachment G. Since the auxiliary wheel loosening prevention mechanism 35 prevents the round handle 28 from rotating, the engagement between the engagement hook 29 and the engagement rod 6 can be prevented from loosening.
According to the second aspect of the invention, the auxiliary wheel loosening prevention mechanism 35 is provided with respect to the pair of leg portions 36 that are inserted into the advancing/retreating rod 27 to which the round handle 28 is attached, and the shaft cylinder 37 provided on the leg portions 36. The auxiliary wheel is configured to be movable between the engagement position of the handle 28 that engages with the spoke portion 39 and the retracted position that is in a non-contact state with the spoke portion 39, so that the auxiliary wheel is simple and inexpensive. Since the slack prevention mechanism 35 can be configured and the auxiliary wheel slack prevention mechanism 35 can be provided in the auxiliary wheel mounting tool G before the auxiliary wheel S is mounted on the tractor wheel 1, the auxiliary wheel slack prevention mechanism 35 can be provided. It is not necessary to prepare it separately from the auxiliary wheel mounting tool G, and it suffices to move the engagement body 38 with respect to the shaft cylinder 37, and operability and workability can be improved.
According to the invention of claim 3, since the retaining stopper 48 is formed at one end of the engaging body 38 and the retaining stopper pin 49 is detachably attached to the other end of the engaging body 38, the retaining stopper is provided. The engaging stopper 38 and the stopper pin 49 for preventing the stopper can prevent the engaging body 38 from coming off, and the engaging body 38 can be easily prevented from coming off. Further, the engaging body 38 is spoked on the round handle 28 side of the shaft cylinder 37. An engaging insertion hole 46 that engages with an engaging pin 40 that is held at an engaging position that engages with the portion 39 is formed, and an engaging body 38 is formed on the tractor wheel 1 side of the shaft cylinder 37 with respect to the spoke portion 39. Since the retracting insertion hole 47 with which the engaging pin 40 held in the non-contact state is engaged is formed, the engaging pin 40 is selectively engaged with the engaging insertion hole 46 and the retracting insertion hole 47. The engaging body 38 can be engaged and retracted by only this, and the operability can be facilitated. Further, when the engaging pin 40 is engaged with the retracting insertion hole 47, the engaging body 38 is attached to the barrel 37. Since the state can be maintained, loss of the engagement body 38 can be prevented, and operability can be improved in this respect as well.

FIG. 3 is a vertical sectional front view of a tractor wheel equipped with auxiliary wheels. The same assembly drawing. The partial vertical front view of the mounting tool for auxiliary wheels. The perspective view of the mounting tool for auxiliary wheels. FIG. 6 is a partially transverse plan view, a side view, and a front view of the auxiliary wheel loosening prevention mechanism. The partial longitudinal front view of other embodiment of the inner side mounting metal fittings of a mounting tool for auxiliary wheels. The same side view. The partial side view of the auxiliary wheel and an outer side mounting metal fitting. The partial front view of the same auxiliary wheel and an outer side mounting metal fitting. The front view of the same round handle part.

An embodiment of the present invention will be described with reference to the drawings. 1 is a wheel (rubber tire) of an agricultural tractor, 2 is a metal wheel thereof, and an auxiliary wheel S having a lug 3 is provided on the tractor wheel 1 as an auxiliary wheel mounting device. Attach via G.
That is, most of the conventional auxiliary wheels are manufactured by the auxiliary wheel manufacturers upon receiving an order from the tractor manufacturer, but since the auxiliary wheels are manufactured to match the tractor of each company's unique structure, Even though the wheels have the same outer diameter, the positions of the mounting holes and the number of the mounting holes have a unique structure. For example, the auxiliary wheel manufactured for the tractor of company X cannot be mounted on the tractor of company Y. However, if the auxiliary wheel mounting device G is used to mount the auxiliary wheels, the auxiliary wheel manufacturer can produce a large number of auxiliary wheels S without limiting the number of the auxiliary wheels, and when an order is received from the tractor manufacturer for the auxiliary wheels, the manufacturer of the auxiliary wheels will receive the order. From the specification table of the tractor to be manufactured, it is sufficient to produce only the auxiliary wheel mounting tool G that matches the specification table and ship it together with the auxiliary wheel S that has already been produced.

The configuration of the auxiliary wheel mounting tool G is arbitrary, but as an example, the auxiliary wheel mounting tool G is an inner mounting bracket A that is mounted on the outside of the wheel 2 of the agricultural tractor wheel 1, and a metallic auxiliary wheel S. And an outer mounting bracket B mounted on the side.
The inner mounting member A has, for example, six engaging protrusions 4 horizontally projected outward, a large round hole 5 is formed in the center of the inner mounting member A, and the inner mounting member A has a shaft rod shape so as to straddle the hole 5. Both ends of the engaging rod 6 are provided in a fixed state.
The inner mounting bracket A has a mounting screw 7 protruding outward from the wheel 2 inserted through a through hole 8 and fixed by a nut 9.
The auxiliary wheel S has an iron basket shape and includes a plurality of lugs 3 at predetermined intervals.

An engaging hole 15 of a vertical plate 16 of the outer mounting member B is inserted and fitted into the engaging protrusion 4 of the inner mounting member A, and an auxiliary wheel S is attached to the vertical plate 16 via an arm portion 17.
The base portion 18 of the arm portion 17 is welded to the outer surface of the vertical plate 16, the free end of the arm portion 17 is left, and the free end portion 19 of the arm portion 17 is superposed on the mounting protrusion 20 of the auxiliary wheel S. The portion 19 and the attachment protrusion 20 are detachably attached with screws 21.
The base portion of the mounting frame 25 (FIG. 8) is attached to the vertical plate 16 of the outer mounting bracket B (FIGS. 1 to 3 ), and the advancing/retreating rod 27 is screwed to the mounting frame 25 so that the advancing/retreating rod 27 can be moved back and forth. A round handle 28 is fixedly attached to the end, and an engaging hook 29 that engages with the engaging rod 6 of the inner fitting A is provided at the inner end of the advancing/retreating rod 27. The engaging hook 29 is screwed onto the screw portion 30 provided at the base of the engaging hook 29, and the advancing/retreating rod 27 is screwed. When the round handle 28 is rotated, the engaging hook 29 is moved in the longitudinal direction of the advancing/retreating rod 27. , The engaging rod 6 is disengaged.

Reference numeral 31 is a spring for pulling the engagement hook 29 outward.
The outer mounting bracket B is provided with an auxiliary wheel loosening prevention mechanism 35 for preventing the engagement hook 29 from loosening with respect to the engagement rod 6 due to the outward movement of the advancing/retreating rod 27.
The auxiliary wheel loosening prevention mechanism 35 connects the pair of left and right leg portions 36 with a shaft cylinder 37, and an engagement body 38 is slidably inserted into the shaft cylinder 37. The engagement body 38 engages with a spoke portion 39 of the round handle 28. It is movably provided between the engaging position and the retracted position where it does not come into contact with the spoke portion 39, and the movement of the engaging body 38 is stopped by the engaging pin 40.

Therefore, the auxiliary wheel S is attached to the tractor wheel 1 via the auxiliary wheel mounting tool G,
The engaging hook 29 on the side of the auxiliary wheel S of G is engaged with the engaging rod 6 of the inner mounting bracket A attached to the side of the tractor wheel 1, and the advancing/retreating rod 27 is moved to the outside by the handle 18, so that the tractor wheel 1 is engaged. When the attachment of the auxiliary wheel S is completed and the engaging body 38 is positioned inside the round handle 28 in this state and the movement of the engaging body 38 is stopped by the engaging pin 40, the round handle 28 is caused by vibration or the like. Even if the engagement hook 29 tries to rotate in the loosening direction, the engagement body 38 engages with the spoke portion 39 of the round handle 28 to prevent the round handle 28 from rotating.

Therefore, since the round handle 28 and the advancing/retreating rod 27 do not rotate with respect to the mounting frame 25, the movement of the engaging engagement hook 29 screwed to the advancing/retreating rod 27 is prevented and the engaging handle 6 is prevented from coming off. To do.
Reference numeral 46 denotes an engagement insertion hole formed in the shaft cylinder 37 for engaging the engagement pin 40 when the engagement body 38 is located at the engagement position for engaging the spoke portion 39 of the round handle 28, and 47 denotes the engagement body 38. A withdrawal insertion hole formed in the shaft cylinder 37 with which the engagement pin 40 is engaged when it is positioned at the retracted position where it does not come into contact with the spoke portion 39, and 48 is a stopper for retaining that is provided at one end of the engagement body 38. Reference numeral 49 is a stopper pin provided at one end of the engaging body 38 for preventing slipping out.

FIG. 6 shows another embodiment of the auxiliary wheel mounting tool G, in which the inner mounting bracket A is formed in a ring plate shape, and the center of the inner mounting bracket A is passed to one side and the other side of the ring plate shape. Both ends of the engaging rod 6 are fixedly provided.
The inner fitting A is provided with a pin-shaped engaging protrusion 4 protruding toward the auxiliary wheel S, and a through hole 51 into which the retaining pin 50 is inserted and engaged is formed in the head of the engaging protrusion 4 at a predetermined portion. (Fig. 6).
The inner mounting bracket A has a mounting screw 7 protruding outward from the wheel 2 inserted through a through hole 8 and fixed by a nut 9. However, in order to match each manufacturer, the through hole 8 through which the mounting screw 7 is inserted is a radial direction. It has a long hole (Fig. 7).

  The auxiliary wheels S are attached to the pair of inner and outer (right and left) circular bodies 53 with both ends of the lug 3 in the left and right direction fixed (FIG. 9). Of the inner ring body 53 of the auxiliary wheel S, the inner ring body 53 on the inner side is formed in a pipe shape, and the inner ring body 53 on the outer side is formed in a plate shape. The tip of the arm portion 17 of the outer mounting bracket B is welded and fixed to the inner ring body 53 of the auxiliary wheel S, and the base of the arm portion 17 is detachable from the outer ring body (vertical plate 16) 55 of the outer mounting bracket B. To fix it. A through hole 56 is formed in the base portion of the arm portion 17, the engaging protrusion 4 of the inner fitting A is inserted into the through hole 56, and a predetermined portion of the engaging protrusion 4 protruding from the through hole 56 is engaged. The retaining pin 50 is inserted and engaged with the through hole 51 in the head of the projection 4 (FIG. 10).

  The base of the mounting frame 25 is attached to the outer ring body 55 of the outer mounting bracket B, the advancing/retreating rod 27 is inserted into the mounting frame 25 so that the advancing/retreating rod 27 can freely move, and the round handle 28 is fixedly attached to the outer end of the advancing/retreating rod 27. A base portion of an engaging hook 29 that engages with the engaging rod 6 of the inner mounting bracket A is screwed to the inner end of the advancing/retreating rod 27, and the auxiliary wheel loosening prevention mechanism 35 is attached to the advancing/retreating rod 27 of the outer mounting bracket B. Is inserted through the through holes 36A of the pair of left and right leg portions 36, the shaft cylinder 37 is fixed to the leg portions 36, and the engaging body 38 is slidably inserted into the shaft cylinder 37. It is provided so as to be movable between an engaging position for engaging with the spoke portion 39 and a retracted position for not being in contact with the spoke portion 39, and the movement of the engaging body 38 is stopped by the engaging pin 40.

(Operation of Embodiment)
The present invention has the above-mentioned configuration, and the auxiliary wheel manufacturer does not limit the number of auxiliary wheels S and produces a large number of auxiliary wheels S in advance. When an order for auxiliary wheels is received from a tractor maker, only the inner fittings A and outer fittings B of the fittings G for auxiliary wheels that match the order are produced from the specifications of the tractor manufacturer, and they are already produced. The farmer who shipped the auxiliary wheel S and the auxiliary wheel mounting tool G together, and obtained the farmer fastened the inside mounting bracket A of the auxiliary wheel mounting tool G to the wheel 2 of the tractor wheel 1 with the mounting screw 7. The auxiliary wheel S is attached to the outer side of the tractor wheel 1 via the outer side attachment B on the attachment A.

Thus, the auxiliary wheel S can be attached to the tractor wheel 1 of the tractor of each tractor manufacturer through the auxiliary wheel mounting tool G, but the engaging engagement hook 29 of the auxiliary wheel mounting tool G is provided. Is inserted into the advancing and retracting rod 27, and the engaging and engaging hook 29 is biased by a spring 31 so as to be pulled outward, so that the round handle 28 is rotated by vibration or the like, whereby the engaging and engaging hook 29 is pulled. Rattling may occur at the engaging portion between the engaging rod 6 and the engaging rod 6.
According to the present invention, the auxiliary wheel loosening prevention mechanism 35 is provided in the auxiliary wheel attachment G because the auxiliary wheel loosening prevention mechanism 35 is provided for preventing the engagement of the engagement hook 29 from loosening with respect to the engagement rod 6. It is possible to prevent the round handle 28 from rotating and prevent the engagement hook 29 from being loosened from the engagement rod 6, so that the tractor work in the field can be performed smoothly.

  The auxiliary wheel loosening prevention mechanism 35 inserts the through holes 36A of the pair of left and right leg portions 36 into the advancing and retracting rod 27, engages the engaging body 38 with the shaft cylinder 37 provided with the leg portions 36, and the spoke portions 39 of the round handle 28. Since it is movably provided between the engaging position and the retracted position where the spoke portion 39 is in the non-contact state, in the state where the engaging body 38 is located in the retracted position where the spoke portion 39 is in the non-contact state, The outer mounting bracket B (auxiliary wheel S) of the auxiliary wheel mounting tool G is mounted on the inner mounting bracket A of the tractor wheel 1, and the circular handle 28 is rotated to engage the engaging hook 29 with the engaging rod 6. After the mounting is completed, the engagement pin 40 is removed from the engagement body 38, the engagement body 38 is made movable with respect to the shaft cylinder 37, and the engagement body 38 is engaged with the spoke portion 39 of the round handle 28. When the auxiliary wheel loosening prevention mechanism 35 locks the auxiliary wheels S, the auxiliary wheels S are completely attached, and the tractor work is performed in the field.

Even if the auxiliary wheel S vibrates during work, the engagement body 38 of the auxiliary wheel loosening prevention mechanism 35 is in contact with the spoke portion 39, so that the round handle 28 is prevented from rotating due to vibration or the like. To do.
Therefore, the engagement between the engagement rod 6 and the engagement hook 29 can be prevented from loosening during the work in the field, and the work can be efficiently and smoothly performed.
Since the engagement body 38 is slidably attached to the shaft cylinder 37, the rotation of the round handle 28 can be prevented by bringing the engagement body 38 into contact with the side surface of the spoke portion 39 of the round handle 28 in the loosening direction. ..

A stopper 48 for retaining is formed on one end of the engaging body 38, and a stopper pin 49 for retaining is detachably attached to the other end of the engaging body 38, so that the stopper pin 49 for retaining is removed. When the stopper pin 49 for retaining is inserted into the barrel 37 in this state and the end of the engaging body 38 is engaged in this state, the stopper pin 49 is prevented from coming off the barrel 37.
Next, on the round handle 28 side of the shaft cylinder 37, since the engagement insertion hole 46 located at the engagement position for engaging the spoke portion 39 is formed, the engagement hook 29 is engaged with the engagement rod 6. Then, when the attachment of the auxiliary wheel forest S is completed, the engagement pin 40 is engaged with the engagement insertion hole 46, the engagement body 38 is brought into contact with the spoke portion 39, and the rotation of the round handle 28 is blocked to perform the work in the field. The looseness of the engagement between the engagement rod 6 and the engagement hook 29 therein is prevented.

  Next, on the tractor wheel 1 side of the shaft tube 37, since the retracting insertion hole 47 for holding the engaging body 38 in a non-contact state with the spoke portion 39 is formed, the engaging pin 40 is used for the engaging insertion hole 46. And the engaging body 38 is moved to the tractor wheel 1 side, the engaging body 38 is brought into a non-contact state with the spoke portion 39, and when the engaging pin 40 is inserted into the retracting insertion hole 47, the engaging body 38 is removed. When the non-contact state is maintained, the round handle 28 is rotated in the unlocking direction, and the engaging hook 29 is removed from the engaging rod 6, the auxiliary wheel S and the outer mounting bracket B are fixed to the tractor wheel 1 inside mounting. The scent of the metal fitting A can be removed, and maintenance of the auxiliary wheel S is performed.

Since the auxiliary wheel loosening prevention mechanism 35 is inserted through the through hole 36A of the leg portion 36 in the advancing/retreating rod 27, the auxiliary wheel loosening preventing mechanism 35 is to be transported integrally with the outer mounting bracket B of the auxiliary wheel mounting device G. It is possible to prevent the engagement body 38 of the auxiliary wheel loosening prevention mechanism 35 from being lost, and it is not necessary to carry the engagement body 38 one by one and attach it to the outer mounting bracket B of the auxiliary wheel attachment G, thereby improving workability.
Since the auxiliary wheel mounting device G is composed of the pair of leg portions 36, the shaft cylinder 37, the engaging body 38, and the engaging pin 40, it can be manufactured at low cost.

  DESCRIPTION OF SYMBOLS 1... Tractor wheel, 2... Wheel, 3... Lug, 4... Engagement protrusion, 5... Hole, 6... Engagement rod, 8... Through hole, 9... Nut, 16... Vertical plate, 17... Arm part, 19... Free end portion, 20... Mounting protrusion, 25... Mounting frame, 27... Advance/retract rod, 28... Round handle, 29... Engaging hook, 31... Spring, 35... Auxiliary wheel loosening prevention mechanism, 36... Leg portion, 36A... Transparent Holes, 37... Shaft cylinders, 38... Engaging bodies, 39... Spoke portions, 40... Engaging pins, 46... Engaging insertion holes, 47... Retracting insertion holes, 48... Retaining stoppers, 49... Retaining stoppers Pins, 50... retaining pins, 51... through hole, 53... ring body, 55... outer ring body, 56... through hole, A... inner fitting, B... outer fitting, G... auxiliary wheel fitting.

Claims (3)

  A metal auxiliary having an inner mounting bracket A having an engaging rod 6 mounted on the outer side of the rubber wheel 1 of the agricultural tractor, and an engaging hook 29 engaging the engaging rod 6 of the inner mounting bracket A. An auxiliary wheel mounting tool G for mounting the auxiliary wheel S on the tractor wheel 1 is constituted by the outer mounting bracket B detachably attached to the wheel S, and the engaging hook 29 is attached to the engaging rod 6 by the round handle 28. The auxiliary wheel slack that prevents the engagement of the engagement hook 29 and the engagement rod 6 from being loosened by preventing the round handle 28 from rotating in the auxiliary wheel mounting tool G. Auxiliary wheel mounting device for agricultural tractor auxiliary wheels provided with a prevention mechanism 35.   The auxiliary wheel loosening preventing mechanism 35 according to claim 1, wherein the pair of leg portions 36 inserted into the advancing/retreating rod 27 to which the round handle 28 is attached, and the shaft cylinder 37 provided in the leg portion 36 are provided with the round handle. An auxiliary wheel mounting device for an auxiliary wheel for an agricultural tractor, which is composed of an engaging body 38 that is movable between an engaging position of engaging with the spoke portion 39 of 28 and a retracted position that is in a non-contact state with the spoke portion 39.   The round handle of the shaft cylinder 37 according to claim 2, wherein a stopper 48 for retaining is formed at one end of the engaging body 38, and a stopper pin 49 for retaining is detachably attached to the other end of the engaging body 38. An engagement insertion hole 46 is formed on the 28 side for engagement with an engagement pin 40 for holding the engagement body 38 at the engagement position for engaging the spoke portion 39. An auxiliary wheel mounting device for an auxiliary wheel for an agricultural tractor, which has a retracting insertion hole 47 with which an engagement pin 40 for holding the united body 38 in a non-contact state with the spoke portion 39 is formed.

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