JP6183781B2 - Steering front wheel of riding mower - Google Patents

Description

  The present invention relates to a steering front wheel of a riding-type grass mower that performs a grass cutting operation while traveling by rotating the front steering wheel, and prevents the grass from being wound around the front wheel.

  In order to prevent grass from being wrapped around the steering front wheel, a technique is known in which a disk-shaped plate cover is attached to the front wheel axle to cover the inner side surface of the front wheel tire (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-112613

  In a front mower where a mower deck is attached to the car body and mowing the front wheel, or in a mid mower, where the front wheels can be steered, long grass comes into contact with the steer case or front steered wheel and the front wheel axle It is known that it becomes easy to be caught. In the form of covering the entire inner surface of the tire with a plate cover as in Patent Document 1, foreign matters such as grass and stones are bitten between the contact-facing surfaces of the fixed plate cover and the tire, and both contact with each other. The distance between the surfaces is gradually increased, so that the winding of the grass axle is facilitated. Especially in the front-wheel drive mode or the four-wheel drive mode for driving the front wheels, the front wheel steering case is large, and there are projections such as bolts on the outer side of the steering case, and grass is on these projections. There is a problem of being caught and wound around the front wheel.

According to the first aspect of the present invention, the outer peripheral surface of the steering case 3 and the wheel rim of the steering front wheel 1 are mounted on the outer side surface of the steering case 3 for mounting the axle 2 of the steering front wheel 1 to be transmitted and rotated. 4, a foil cover 5 is provided to cover the inner peripheral edge of the cover 4. The wheel cover 5 has a cylindrical outer peripheral surface 16, and a cover hole 13 fitted to the outer surface of the steering case 3 at the center. The cover hole 13 is fitted and attached to the outer surface of the steering case 3, and the outer surface of the mounting plate 14 formed along the outer surface of the wheel cover 5 is made of a rubber material or the like. An operation of a riding mower characterized in that a seal mat 15 is attached and a cover edge 6 which is an outer peripheral edge of the wheel cover 5 is brought close to a curved inner peripheral surface 8 of a rim edge 7 which is curved outwardly of the wheel rim 4. The front wheel configuration.

  The body of a mid-mower mower with a mower deck attached to the abdomen travels while the front wheel 1 is driven to rotate by the axle 2 of the steering case 3, and the steering case 3 is steered by operating the steering wheel. The turf grass on the traveling ground in the mower deck is cut. During this mowing operation, even if uncut grass or turf grass that has already been cut by the blades of the mower deck is about to enter or penetrate into the inner side of the axle chamber A of the steering front wheel 1, the curved inner periphery of the wheel rim 4 will be described. There is a case cover 5 formed so as to cover the space between the surface 8 and the outer peripheral edge portion 19 of the steering case 3, and is closed by the outer peripheral surface of the wheel cover 5 to rotate the axle 2. Intrusion into the axle chamber A formed between the steering case 3 and the wheel rim 4 is prevented. Moreover, it is the form which covers the protrusion part of the outer side part of the steering case 3 with the foil cover 5, and grass does not get caught in these protrusion parts, and the winding of the grass to the inner part of the front wheel 1 can be prevented.

  When the steering case 3 is rotated in the left-right direction around the steering shaft 33, the wheel cover 5 integrally formed with the steering case 3 is also rotated, and the cover edge 6 of the wheel cover 5 is rotated. Between the wheel rim 4 and the curved inner peripheral surface 8 on the wheel rim 4 side, or the gap B is difficult to change or expand. Prevent foreign objects from entering.

  Further, the cover edge 6 protruding as the outer peripheral edge of the foil cover 5 is positioned inside the rotation area of the rim edge 7 so as to be fitted to the curved inner peripheral surface 8 of the wheel rim 4. Since this is a form, the gap position of the approaching rotation between the cover edge 6 and the rim edge 7 is in the retracted position form retracted to the inner side of the inner edge width side edge of the front wheel 1 tire 9 width, It effectively prevents foreign matter from contacting or biting the gap B between the fixed side cover edge 6 and the rotating side rim edge 7 and maintains its effect.

  Moreover, since the facing approach gap B between the cover edge 6 and the curved inner peripheral surface 8 forming the rim edge 7 is configured to be located at the wheel rim 4 portion on the center side of the rotation diameter of the tire 9, Even if the mowing ground is in a soft state, it is easy to prevent intrusion, interruption and intrusion of mud and stones.

  The foil cover 5 has an outer peripheral surface 16 formed in a cylindrical shape, a cover hole 13 to be fitted to the outer surface of the steering case 3 is formed in the central portion, and a seal mat 15 is overlapped and attached to the outer portion. The holding plate 14 to be held is formed, and the outer peripheral edge portion of the mounting plate 14 and the seal mat 15 is formed as the cover edge 6, and the inner surface of the rim edge 7 of the wheel rim 4, that is, the curved inner peripheral surface 8. They are facing each other. For this reason, since the outer peripheral edge of the mounting plate 14 and the outer peripheral edge of the seal mat 15 approach the curved inner peripheral surface 8 of the rim edge 7 as the cover edge 6 on the foil cover 5 side in a superposed form, The sealing effect in the gap portion B between the rim edge 7 and the curved inner peripheral surface 8 is maintained high, and the penetration of grass, mud, etc. is favorably performed. Further, the seal mat 15 is formed with a mat hole 17 having substantially the same shape as the cover hole 13 at the center, and the steering case for extending the cover hole 13 and the mat hole 17 in the protruding direction of the axle 2. 3, and can be detachably attached to the mounting case 3 mounting seat 19 of the steering case 3 by tightening the bolt 18. The seal mat 15 is attached to the attachment plate 14 so as to be detachable by bolts 64 and nuts 65. The inner peripheral edge of the mat hole 17 of the seal mat 15 is formed so that grass, mud, or the like does not enter the axle chamber A by approaching or contacting the outer peripheral surface of the steering case 3.

  Further, by attaching the seal mat 15 to the outer surface of the attachment plate 14 of the foil cover 5 and attaching it, the attachment and holding of the seal mat 15 can be stabilized, and the seal is maintained for a long period of time. be able to.

  Thus, since the wheel cover 5 is adapted to the shape of the steering case 3 and is attached to the mounting seat 19, the thickness of the wheel cover 5, the outer diameter, the thickness of the seal mat 15, the outer The diameter, etc. is set as a simple part form corresponding to the shaft mounting position of the wheel rim 4 of the front wheel 1 and the rim edge 5 diameter, etc., the configuration can be simplified, and attachment / detachment and maintenance are easy The production cost can be reduced.

According to the second aspect of the present invention, the outer peripheral edge of the mounting plate 14 and the outer peripheral edge of the seal mat 15 are formed to have substantially the same diameter, and the inner peripheral edge of the seal mat 15 approaches the outer surface of the steering case 3. Or make sliding contact.

  As described above, the cover edge 6 on the outer peripheral edge of the attachment plate 14 of the wheel cover 5 and the outer peripheral edge of the seal mat 15 attached to the attachment plate 14 of the foil cover 5 are overlapped at substantially the same edge position, so that the wheel rim 4 is closer to the inner side of the rim edge 7, the opposing area between the outer peripheral edge of the seal mat 15 and the curved inner peripheral surface 8 of the wheel rim 4 is wider than the opposing area of the cover edge 6. In addition, due to the good sealing property of the seal mat 15 itself, the gap B between the curved inner peripheral surface 8 of the wheel rim 4 and the outer peripheral edge of the cover edge 6 and the seal mat 15 leads to the axle chamber A. Prevent foreign material such as grass and mud from entering.

  According to the first aspect of the present invention, in order to make the cover edge 6 at the outer peripheral edge of the wheel cover 5 fixed to the steering case 3 approach the curved inner peripheral surface 8 of the rotating rim edge 7 on the wheel rim 4, The cover edge 6, which is the outer peripheral edge of the rim 5, is located on the inner side of the rim edge 7 located at the outer end of the wheel rim 4, and is obscured inside the curved inner peripheral surface 8 of the rim edge 7. The rim edge 7 is brought close to the curved inner peripheral surface 8, the gap B is hardly exposed to the outer peripheral surface side, and it is easy to prevent intrusion of grass or mud.

  In addition, the gap B between the outer peripheral edge of the wheel cover 5 and the curved inner peripheral surface 8 of the wheel rim 4 can be easily maintained substantially constant, and frictional resistance, frictional damage, and the like are reduced.

  The tire 9 fitted to the outer periphery of the wheel rim 4 is easily deformed by a tire rubber material. The rim edge 7 of the small-diameter wheel rim 4 for fitting the tire to the outer peripheral portion has the cover edge 6 portion. The deformation of the gap B is small, and the effect of preventing insertion of turfgrass or the like can be enhanced. By bringing the cover edge 6 of the outer peripheral edge of the wheel cover 5 closer to the curved inner peripheral surface 8 of the wheel rim 4, even if grass comes into contact with the cover edge 6 or the front wheel 1 sinks to the running ground. In addition, contact with grass, mud, etc. can be prevented, and these entrainment can be effectively prevented.

Further, since the wheel cover 5 is formed by forming the outer peripheral surface 16 of the ring cover 59 in a cylindrical shape, the configuration can be simplified, and even if grass contacts the outer peripheral surface 16 of the foil cover 5, The mounting plate 14 and the seal mat 15 that are easily escaped from resistance and are formed on the inner side of the foil cover 5 are configured so that the outer peripheral cover edge 6 is fitted to the curved inner peripheral surface 8 of the rim edge 7. Since the edge 6 is attached so as to cover it, the contact of grass is effectively prevented, and it is difficult to open a gap between the cover edge 6 and the curved inner peripheral surface 8 of the rim edge 7.

  Further, the seal mat 15 is formed into a mat shape from a rubber material or a synthetic resin material and has an elastic strain characteristic. However, since the seal mat 15 is superposed and fixed on the mounting plate 14 surface in the form of a flat plate, The position of the cover edge 6 and the gap B with the cover edge 6 are made difficult to open to prevent the grass from being pushed into or into the axle chamber A side.

  In attaching / detaching the foil cover 5 and the seal mat 15, the cover hole 13 can be attached to and detached from the outer periphery of the steering case 3 from the outside, so that the configuration and operation can be simplified and the production cost can be reduced. Can be reduced.

In the invention according to claim 2 , as described above, the seal mat 15 has a suitable elasticity like a synthetic resin material or a rubber material and is easily distorted. Therefore, the gap B between the outer peripheral edge of the seal mat 15 and the one-curved inner peripheral surface 8 of the rim edge 7 can be maintained constant. In addition, the cover edge 6 corresponding to the outer peripheral edge portion of the mounting plate 14 and the outer peripheral edge of the seal mat 15 are formed in substantially the same diameter, so that the cover edge 6 of the mounting plate 14 and the outer surface of the seal mat 15 are removed. The outer peripheral edge of the thick layer in the form of polymerization with the peripheral edge is opposed to the rim edge 7 surface of the curved inner peripheral edge 8, and the side surface of the outer peripheral edge portion of the seal mat 15 is opposed to the outer surface 12 of the curved inner peripheral face 8 By approaching or slidingly contacting, the seal mat 15 is less deformed, and the effect of preventing foreign matter from entering the gap B can be increased.

The front view of a front wheel part. The enlarged front view of a wheel cover part. The exploded front view of a wheel cover part. The disassembled perspective view of a wheel cover part. A side view of the mower. A top view of the mower. Front view of mower. The layout of a wheel transmission mechanism.

  On the basis of the drawings, the mower mounts a mower deck 23 that can be lifted and lowered via a lift link 22 on the abdomen of a four-wheeled vehicle body 21 in which the front steering wheel 1 and the rear wheel 20 are arranged, and behind the driver seat 24. The mounted engine 25 can drive the front wheel 1 and the rear wheel 20 in conjunction with each other, and the blade 26 and the blade shaft 27 of the mower deck 23 can be rotated in conjunction to cut grass. A handle 29, a handle post 30, and an operation board 31 are disposed in front of the driver seat 24 via the floor 28, and the steering case 3 at both ends of the front axle housing 32 is operated by rotating the handle 29. Can be steered by rotating around the steering shaft 33. Sideboards 34 and 35 are disposed on the left and right sides of the driver's seat 24, and an engine cover 36 that covers the engine room, a fender 37 that covers the upper portion of the rear wheel 20, and the like are provided on the rear side. Further, an accelerator pedal 38, a brake pedal 39, and the like are disposed at the base portion and the foot portion of the handle post 30 at the front end portion of the floor 28, and the front end edge portion is curved upward in a sled shape.

  The front wheel 1 and the rear wheel 20 are linked by a transmission mechanism of the transmission case 41 and an HST (hydraulic continuously variable transmission) 44 by the engine 25, and the rear axle housing 42 extending from the transmission case 41 to the left and right rear wheels 20. The inner rear wheel shaft 43 is driven to rotate. Further, by driving the HST 44, the hydraulic motor 46 of the front axle housing 32 is driven by the hydraulic pressure of the hydraulic circuit (hose) 45, and the front wheel shaft 47 of the shaft mounting is transmitted and rotated in the front axle housing 32. it can. Reference numeral 70 denotes an oil tank for HST44.

  Steering cases 3 for mounting the axle 2 linked to the front wheel shaft 47 inside the front axle housing 32 at the left and right ends of the front axle housing 32 can be rotated around the steering shaft 33 by a predetermined angle range. The steering handle 29 is rotated by the handle 29 via the interlocking tie rod 48, the steering arm 49, and the like. The axle 2 rotates a gear mechanism disposed around the steering shaft 33 from the front wheel shaft 47 of the front axle housing 32 to transmit and rotate the axle 2 supported by the steering case 3. A rubber plate 66 is suspended on the front side of the operation case 3 to guide the grass to a certain cutting posture so as to push the turf grass forward at an appropriate angle.

  On the outer surface of the steering case 3, a side case 52 is attached by tightening a bolt 53 so that the axle 2 can be rotatably inserted into the shaft hole 51 in the center portion and supported. The outer surface of the side case 52 is formed in a substantially conical shape in which the central shaft hole 51 is projected, and radial case ribs 54 are arranged and formed at appropriate angular intervals. On the outer side surface of the side case 52, a flat ring-shaped mounting seat 19 surface is formed on the outer peripheral side surface along the circumferential direction, and bolt holes 56 and 57 are formed at a plurality of equiangular positions on the mounting seat 19 surface. Then, the side case 52 is integrally attached to the steering case 3 by inserting the bolt 53, or the bolt 18 is inserted from the bolt hole 58 of the wheel cover 5 to the bolt hole 56 of the side case 52. This foil cover 5 can be attached to the outside of the side case 52 by screwing. The bolt hole 58 is formed in the mounting plate 14 and the ring cover 59, and the ring cover 59 can be attached to the mounting seat 19 by being fastened.

  The wheel boss 50 of the front wheel 1 is fitted and attached to the outer side of the axle 2 that is mounted on the steering case 3. The wheel rim 4 having the wheel boss 50 is fitted with a tire 9 with lugs 67 on the outer peripheral portion. The outer peripheral edge of the wheel rim 4 is curved outward from the ear receiving portion 11 that receives the ear portion 10 of the tire 9. A rim edge 7 is formed to project. A curved inner peripheral surface 8 that curves from the outer surface 12 of the ear receiving portion 11 to the rim edge 7 portion is formed. The wheel cover 5 is attached to the outer side of the steering case 3 so as to cover the space (axle chamber A) between the steering case 3 and the wheel rim 4 of the front wheel 1.

  Here, an outer peripheral surface of the steering case 3 and an inner peripheral portion of the wheel rim 4 of the steering front wheel 1 are provided on the outer surface of the steering case 3 that axially mounts the axle 2 of the steering front wheel 1 to be transmitted and rotated. The wheel cover 5 is provided so as to cover the outer edge of the wheel cover 5, and the cover edge 6, which is the outer peripheral edge of the wheel cover 5, is made to approach the curved inner peripheral surface 8 of the rim edge 7 that is curved outward of the wheel rim 4.

  The body of a mower having a mower with a mower 4 attached to the abdomen travels while the front wheel 1 is driven to rotate by the axle 2 of the steering case 3, and the steering case 3 is steered by operating the steering wheel. The turf grass on the running ground in the mower deck is cut. During this mowing operation, even if uncut grass or turf grass that has already been cut by the blades of the mower deck is about to enter or penetrate into the inner side of the axle chamber A of the steering front wheel 1, the curved inner periphery of the wheel rim 4 will be described. There is a case cover 5 formed so as to cover the space between the surface 8 and the outer peripheral edge portion 19 of the steering case 3, and is closed by the outer peripheral surface of the wheel cover 5 to rotate the axle 2. Intrusion into the axle chamber A formed between the steering case 3 and the wheel rim 4 is prevented. Moreover, it is the form which covers the protrusion part of the outer side part of the steering case 3 with the foil cover 5, and grass does not get caught in these protrusion parts, and the winding of the grass to the inner part of the front wheel 1 can be prevented.

  When the steering case 3 is rotated in the left-right direction around the steering shaft 33, the wheel cover 5 integrally formed with the steering case 3 is also rotated, and the cover edge 6 of the wheel cover 5 is rotated. Between the wheel rim 4 and the curved inner peripheral surface 8 on the wheel rim 4 side, or the gap B is difficult to change or expand. Prevent foreign objects from entering.

  Further, the cover edge 6 protruding as the outer peripheral edge of the foil cover 5 is positioned inside the rotation area of the rim edge 7 so as to be fitted to the curved inner peripheral surface 8 of the wheel rim 4. Since this is a form, the gap position of the approaching rotation between the cover edge 6 and the rim edge 7 is in the retracted position form retracted to the inner side of the inner edge width side edge of the front wheel 1 tire 9 width, It effectively prevents foreign matter from contacting or biting the gap B between the fixed side cover edge 6 and the rotating side rim edge 7 and maintains its effect.

  Moreover, since the facing approach gap B between the cover edge 6 and the curved inner peripheral surface 8 forming the rim edge 7 is configured to be located at the wheel rim 4 portion on the center side of the rotation diameter of the tire 9, Even if the mowing ground is in a soft state, it is easy to prevent intrusion, interruption and intrusion of mud and stones.

  Further, the curved inner peripheral surface 8 is formed between the outer surface 12 of the ear receiving portion 11 for fitting and supporting the tire 9 ear portion 10 of the wheel rim 4 and the rim edge 7 of the outer peripheral edge portion. The cover edge 6 is brought close to the curved inner peripheral surface 8.

  The wheel rim 4 of the front wheel 1 forms an ear receiving portion 11 that fits and supports the ear portion 10 of the tire 9 in order to pierce the tire 9 on the outer peripheral portion, but this ear receiving portion 11 located on the inner side of the wheel rim 4. The outer rim edge 12 of the outer peripheral edge of the outer peripheral surface 12 is curved outward to form a curved inner peripheral surface 8, and the cover edge 6 is brought close to the curved inner peripheral surface 8. The rim edge 7 on the 4 side is exposed on the outer peripheral portion of the foil cover 5, but the cover edge 6 of the fixed side wheel cover 5 is positioned inside the curved inner peripheral surface 8, and the outer countersunk portion of the foil cover 5 is The wheel rim 4 is covered and fitted with the dish lid portion, and the front wheel 1 is rotated for grass cutting. The cover edge 6 portion, the curved inner peripheral surface 8 and the outer surface 12 are opposed to each other. To prevent grass entrainment Can.

  Even if there is grass or mud around the rim edge 7 of the wheel rim 4, a cover edge 6 having an enlarged diameter is formed on the outer peripheral surface of the foil cover 5 so as to face the rotating inner peripheral surface of the rim edge 7. Therefore, even if long grass is wrapped around the outer peripheral surface of the foil cover 5, the rim edge 7 is unlikely to enter the curved inner peripheral surface 8 side.

  Further, the wheel cover 5 has a cylindrical outer peripheral surface 16, and a cover hole 13 is formed in the center portion to be fitted to the outer surface of the steering case 3, and this cover hole 13 portion is formed in the steering case. 3, the seal mat 15 made of a rubber material or the like is attached to the outer surface of the mounting plate 14 formed along the outer surface of the wheel cover 5.

  The foil cover 5 has an outer peripheral surface 16 formed in a cylindrical shape, a cover hole 13 to be fitted to the outer surface of the steering case 3 is formed in the central portion, and a seal mat 15 is overlapped and attached to the outer portion. The holding plate 14 to be held is formed, and the outer peripheral edge of the mounting plate 14 and the seal mat 15 is formed as the cover edge 6, and the inner surface of the rim edge 7 of the wheel rim 4, that is, the curved inner peripheral surface 8. They are facing each other. For this reason, since the outer peripheral edge of the mounting plate 14 and the outer peripheral edge of the seal mat 15 approach the curved inner peripheral surface 8 of the rim edge 7 as the cover edge 6 on the foil cover 5 side in a superposed form, The sealing effect in the gap portion B between the rim edge 7 and the curved inner peripheral surface 8 is maintained high, and the penetration of grass, mud, etc. is favorably performed. Further, the seal mat 15 is formed with a mat hole 17 having substantially the same shape as the cover hole 13 at the center, and the steering case for extending the cover hole 13 and the mat hole 17 in the protruding direction of the axle 2. 3, and can be detachably attached to the mounting case 3 mounting seat 19 of the steering case 3 by tightening the bolt 18. The seal mat 15 is attached to the attachment plate 14 so as to be detachable by bolts 64 and nuts 65. The inner peripheral edge of the mat hole 17 of the seal mat 15 is formed so that grass, mud, or the like does not enter the axle chamber A by approaching or contacting the outer peripheral surface of the steering case 3.

  Further, by attaching the seal mat 15 to the outer surface of the attachment plate 14 of the foil cover 5 and attaching it, the attachment and holding of the seal mat 15 can be stabilized, and the seal is maintained for a long period of time. be able to.

  Thus, since the wheel cover 5 is adapted to the shape of the steering case 3 and is attached to the mounting seat 19, the thickness of the wheel cover 5, the outer diameter, the thickness of the seal mat 15, the outer The diameter is set as a simple part configuration corresponding to the shaft mounting position of the wheel rim 4 of the front wheel 1 and the diameter of the rim edge 7, etc. This can be facilitated and the production cost can be reduced.

  Further, the outer peripheral edge of the mounting plate 14 and the outer peripheral edge of the seal mat 15 are formed to have substantially the same edge shape, and the inner peripheral edge of the seal mat 15 approaches or slides on the outer surface of the steering case 3.

  As described above, the cover edge 6 on the outer peripheral edge of the attachment plate 14 of the wheel cover 5 and the outer peripheral edge of the seal mat 15 attached to the attachment plate 14 of the foil cover 5 are overlapped at substantially the same edge position, so that the wheel rim 4 is closer to the inner side of the rim edge 7, the facing area between the outer peripheral edge portion of the seal mat 15 and the curved inner peripheral surface 8 portion of the wheel rim 4 becomes wider. Due to the good sealing property, foreign matter such as grass or mud is allowed to enter the axle chamber A from the gap B between the curved inner peripheral surface 8 of the wheel rim 4 and the outer peripheral edge of the cover edge 6 and the seal mat 15. To prevent.

  The wheel cover 5 attached so as to be fitted to the outer surface of the side case 52 of the steering case 3 is a sheet metal ring cover 59 formed in a circular ring shape around the axle 2 and integrated with this. The mounting plate 14 is configured, and a rubber or synthetic resin seal mat 15 is mounted on the outer surface of the mounting plate 14. The cross-sectional form of the ring cover 59 is formed by forming a cover hole 13 at the center, a side surface 60 on the outer periphery of the cover hole 13, and an outer peripheral surface 16 that forms the outer periphery in a cylindrical surface. . The side surface portion 60 of the wheel cover 5 is joined to the mounting seat 19 in the form of a ring surface of the side case 52 and attached by tightening bolts 18. In this mounted state, the side surface portion 60 of the wheel cover 5 is in close contact with the surface of the mounting seat 19, so that it is difficult to form a bonding gap, and foreign matter can be prevented from entering from this bonding portion. The mounting plate 14 that is integrally welded and joined along the outer edge of the outer peripheral surface 16 of the ring cover 59 has a flat ring shape, and the cover hole 13 that faces the cover hole 13 is formed at the center. The outer peripheral edge is formed with a cover edge 6 that protrudes appropriately from the outer peripheral surface 16 to the radially outer side. The outer diameter of the cover edge 6 is formed to be slightly smaller than the inner diameter of the rim edge 7 of the wheel rim 4, and the wheel rim 4 is rotated with the outer periphery of the cover edge 6 approaching the rim edge 7. Configure.

  The seal mat 15 to be attached to the outer surface of the attachment plate 14 is formed in a circular shape with the outer peripheral edge diameter being substantially the same as the outer peripheral edge diameter of the cover edge 6. A mat hole 17 having a smaller diameter than that of the cover hole 13 such as the plate 14 and capable of being polymerized is formed, and a radial cut 62 is formed in the outer peripheral portion of the mat hole 17, and a side case around the mat hole 17 is formed. 52 The closeness to the outer surface is improved. A bolt hole 63 formed in the seal mat 15 is fitted into a bolt 64 fitted in a bolt hole formed in the mounting plate 14 of the wheel cover 5, and is tightened and fixed by a nut 65 from the outside. Can do. Thus, in the form in which the seal mat 15 is attached, it is also possible to adopt a form in which the outer surface of the outer peripheral edge is brought into sliding contact with the curved inner peripheral surface 8 located inside the opposing rim edge 7.

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Axle 3 Steering case 4 Wheel rim 5 Wheel cover 6 Cover edge 7 Rim edge 8 Curved inner peripheral surface 9 Tire 10 Ear part 11 Ear receiving part 12 Outer side surface 13 Cover hole 14 Mounting plate 15 Seal mat

Claims (2)

On the outer surface of the steering case (3) for mounting the axle (2) of the steering front wheel (1) to be transmitted and rotated, the outer peripheral edge (19) of the steering case (3 ) and the steering front wheel A foil cover (5) is provided to cover the inner periphery of the wheel rim (4) of (1). The foil cover (5) has an outer peripheral surface (16) in a cylindrical shape, and has a central portion. A cover hole (13) to be fitted to the outer side surface of the steering case (3) is formed, and this cover hole (13) portion is fitted and attached to the outer side surface portion of the steering case (3). A seal mat (15) made of a rubber material or the like is attached to the outer surface of the mounting plate (14) formed along the outer surface of the cover (5), and a cover edge (6) which is the outer peripheral edge of the foil cover (5). ) In contact with the curved inner peripheral surface (8) of the rim edge (7) that is curved outwardly of the wheel rim (4). Steering wheel riding mower, characterized in that to. The outer peripheral edge of the mounting plate (14) and the outer peripheral edge of the seal mat (15) are formed in substantially the same edge shape, and the inner peripheral edge of the seal mat (15) approaches the outer surface of the steering case (3). The steering front wheel of the riding mower according to claim 1, wherein the steering front wheel is in sliding contact.

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