JP6777005B2 - Industrial vehicle - Google Patents

Description

The present invention relates to an industrial vehicle, and more particularly to an industrial vehicle provided with a steering angle sensor that detects the steering angle of the steering wheel.

As a conventional technique for an industrial vehicle, for example, a mounting structure for a rotation amount detector disclosed in Patent Document 1 is known. In the mounting structure of the rotation amount detector disclosed in Patent Document 1, a kingpin is rotatably inserted and supported in the support cylinder of the rear axle beam via a needle bearing. A thrust bearing is inserted in the kingpin between the knuckle and the upper support cylinder. A steering angle sensor is attached to the upper surface of the upper support cylinder via a bracket. A marking brazing portion is formed on the lower end surface of the bracket, and an O-ring fitted in a fitting groove is interposed between the marking brazing portion and the kingpin. The O-ring prevents the grease filled in the space around the upper end of the kingpin from entering the wax marking part.

As another prior art, for example, there is an industrial vehicle shown in FIG. In the industrial vehicle shown in FIG. 8, the upper boss portion 91 provided in the rear axle 90 is provided with a pin hole 92 through which the kingpin 93 is inserted. A needle bearing 94 is interposed between the kingpin 93 and the upper boss portion 91. Grease is filled around the kingpin 93. A sensor bracket 95 is fixed on the upper boss portion 91, and a steering angle sensor 96 for detecting the steering angle of the steering wheel is fixed to the sensor bracket 95. The sensor bracket 95 is formed with an insertion hole 98 through which an input shaft 97 fixed to the upper end of the kingpin 93 is inserted. The upper end of the input shaft 97 is inserted into the steering angle sensor 96. A lip seal 99 is provided above the needle bearing 94 in the pin hole 92, and the lip seal 99 prevents grease from entering the insertion hole 98.

The upper boss portion 91 is formed with a communication passage 100 that communicates between the lip seal 99 and the needle bearing 94 in the pin hole 92 and the outside. The communication passage 100 is a passage for replenishing grease, and a grease nipple 101 is provided in the opening on the outer peripheral surface of the upper boss portion 91. An O-ring 102 is provided between the sensor bracket 95 and the upper boss portion 91. The O-ring 102 prevents water from entering the pin hole 92 from the outside. The lip seal 99 and the O-ring 102 are located substantially above and below. The sensor cover 103 is fixed to the sensor bracket 95 by bolts 104. Incidentally, since it is an industrial vehicle according to the normal specifications, the sensor bracket 95 and the sensor cover 103 are made of resin.

Japanese Unexamined Patent Publication No. 10-31738

By the way, explosion-proof specifications may be set for industrial vehicles. In the case of an explosion-proof industrial vehicle, it is necessary to satisfy the conditions of the explosion-proof specification, such as providing an iron sensor cover having a sufficient thickness for the steering angle sensor. However, when the industrial vehicle disclosed in Patent Document 1 has an explosion-proof specification, there is a problem that the length of the member in the axial direction of the kingpin becomes longer due to the protrusion of the sensor cover. A structure in which the length of the member in the axial direction of the kingpin is increased by the protrusion of the sensor cover may cause the sensor cover to interfere with the tire or wheel. Further, in Patent Document 1, since the O-ring is interposed between the outer peripheral surface of the kingpin and the inner peripheral surface of the bracket, the inner peripheral surface of the bracket and the outer peripheral surface of the kingpin need to be sufficiently opposed to each other. Therefore, it is necessary to lengthen the shaft length of the kingpin or lengthen the shaft length of the bracket so that the upper end of the kingpin approaches the steering angle sensor.

Further, in the configuration shown in FIG. 8, when an iron sensor cover covering the steering angle sensor is attached to the upper boss portion in order to make it explosion-proof, the upper part of the steering angle sensor protrudes by this sensor cover in the axial direction of the kingpin. .. A structure in which the length of the member in the axial direction of the kingpin is increased by the protrusion of the sensor cover may cause the sensor cover to interfere with the tire or wheel. Therefore, it is conceivable to shorten the length of the upper boss portion in the axial direction to avoid interference with the sensor cover. However, since the lip seal and the O-ring are located substantially above and below the upper boss portion and the grease passage is provided in the upper boss portion, it is impossible to shorten the length of the upper boss portion in the axial direction. ..

The present invention has been made in view of the above problems, and an object of the present invention is to provide an industrial vehicle in which the sensor cover does not interfere with tires or wheels even if a sensor cover for covering the steering angle sensor is provided. is there.

In order to solve the above problems, the present invention includes a support member provided on the axle beam and having a pin hole, and a king pin that is inserted through the pin hole and rotatably supported by the support member via a bearing. , A sensor bracket fixed to the upper part of the support member and having an insertion hole communicating with the pin hole, a steering angle sensor fixed to the sensor bracket and detecting a steering angle, and fixed to the upper end of the kingpin. In an industrial vehicle provided with an input shaft that is inserted into the insertion hole and connected to the steering angle sensor, the pin hole and the outside of the support member are interposed between the support member and the sensor bracket. A first O-ring that seals between the first O-ring and a second O-ring that is provided on the inner peripheral side of the first O-ring and is interposed between the input shaft and the sensor bracket in the insertion hole. It is characterized by having a ring.

In the present invention, the first O-ring prevents grease from leaking from the pin hole to the outside of the support member and water from entering the pin hole from the outside of the support member. The second O-ring prevents the grease in the pin holes from leaking to the steering angle sensor. The second O-ring is arranged on the inner peripheral side of the first O-ring and is not located above and below each other, so that the length of the support member in the axial direction can be shortened. Therefore, even if the explosion-proof sensor cover is provided, the sensor cover does not interfere with the tire or the wheel. In addition, since the axial length of the support member can be shortened, the axial length of the sensor bracket can be increased within the range where the cover does not interfere with the tire or wheel, and the sensor bracket with explosion-proof specifications can be increased. Will be easier to achieve.

Further, the above-mentioned industrial vehicle may have an annular groove formed on the outer peripheral surface of the input shaft and to which the second O-ring is mounted.
In this case, by mounting the second O-ring in the annular groove formed on the input shaft, the second O-ring will not be displaced in the axial direction. Further, since the second O-ring is mounted on the input shaft, the work of assembling the second O-ring is easy.

Further, the industrial vehicle may have an annular groove provided on the inner peripheral surface of the insertion hole of the sensor bracket and to which the second O-ring is mounted.
In this case, by mounting the second O-ring in the annular groove formed in the sensor bracket, the second O-ring will not be displaced in the axial direction of the kingpin. Further, even if the input shaft cannot be provided with the annular groove, the second O-ring can be provided without being displaced in the axial direction.

Further, in the above-mentioned industrial vehicle, the sensor bracket may be formed and may have a communication passage that communicates the outside of the sensor bracket with the pin hole.
In this case, it is not necessary to provide the support member with the communication passage by providing the communication passage in the sensor bracket.

According to the present invention, even if a sensor cover that covers the steering angle sensor is provided, it is possible to provide an industrial vehicle in which the sensor cover does not interfere with the tire or the wheel.

It is a schematic side view of the forklift which concerns on 1st Embodiment. It is a rear view of the main part of the forklift which concerns on 1st Embodiment. It is sectional drawing of the main part of the rear axle which concerns on 1st Embodiment. It is an enlarged sectional view around the steering angle sensor which concerns on 1st Embodiment. It is an enlarged cross-sectional view around the steering angle sensor which concerns on the modification of 1st Embodiment. It is an enlarged sectional view around the steering angle sensor which concerns on a reference example . It is an enlarged cross-sectional view around the steering angle sensor which concerns on the modification of the reference example . It is an enlarged cross-sectional view around the steering angle sensor of a conventional forklift.

(First Embodiment)
Hereinafter, a forklift as an industrial vehicle according to the first embodiment will be described with reference to the drawings. The "front-back", "left-right", and "up-down" directions for specifying the direction are shown based on the state in which the forklift operator sits on the driver's seat and faces the forward side of the forklift.

As shown in FIG. 1, the forklift as an industrial vehicle is provided with a cargo handling device 12 at the front portion of the vehicle body 11. A driver's seat 13 is provided near the center of the vehicle body 11, and a battery 14 is housed below the driver's seat 13 in the vehicle body 11. The forklift of this embodiment is a battery forklift that is explosion-proof and operates by the electric power of the battery 14.

The driver's seat 13 on the vehicle body 11 is provided with a driver's seat 15 on which an operator can be seated. A steering wheel 16 is provided at the front of the driver's seat 13. The steering wheel 16 is for steering the steering wheel 22, which will be described later. The cargo handling device 12 includes a mast 17, and a pair of left and right forks 19 are provided on the mast 17 via a lift bracket 18.

A drive wheel 20 as a front wheel is provided on the front portion of the vehicle body 11 via a front axle (not shown). The front axle is fixed to the vehicle body 11. The vehicle body 11 is provided with a traveling motor 21 that generates a traveling driving force. The traveling motor 21 is an electric motor and is driven by the electric power of the battery 14. The front axle is provided with a power transmission mechanism (not shown) that transmits the traveling driving force of the traveling motor 21 to the driving wheels 20.

As shown in FIG. 2, a steering wheel 22 as a rear wheel is provided at the rear portion of the vehicle body 11 via a rear axle 23. The rear axle 23 as an axle beam includes a substrate 24 extending in the left-right direction. An upper plate 25 is provided on the upper portion of the substrate 24, and a lower plate 26 is provided on the lower portion of the substrate 24. The upper plate 25 and the lower plate 26 are fixed to the substrate 24 by welding. A connection plate 27 for connecting the upper plate 25 and the lower plate 26 is provided at the rear portion of the substrate 24. The longitudinal direction of the rear axle 23 coincides with the width direction, and the center pin 28 is inserted in the center of the substrate 24 in the width direction. The rear axle 23 is connected to the vehicle body 11 by a center pin 28.

As shown in FIG. 2, a steering hydraulic cylinder 30 is housed in the rear axle 23. The hydraulic cylinder 30 is a double-acting hydraulic cylinder that operates by being supplied with hydraulic oil in a hydraulic circuit (not shown). The cylinder body 31 of the hydraulic cylinder 30 is fixed to the substrate 24 by bolts (not shown) or the like. The inside of the cylinder body 31 is divided into two chambers by a piston (not shown). Rods 32 and 32 extending left and right from the piston and projecting left and right from the cylinder body 31 are connected to the piston. The rod 32 is displaced in the left-right direction by the operation of the hydraulic cylinder 30. The tip of the rod 32 is pivotally attached to the inner end of the tie rod 33. The outer end of the tie rod 33 is rotatably connected to the steering knuckle 35 described below.

Steering knuckles 35 are rotatably supported at the left and right ends of the rear axle 23 via upper boss portions 43 and lower boss portions 44 as support members. The upper boss portion 43 and the lower boss portion 44 will be described later. The shapes of the pair of steering knuckles 35 are symmetrical with each other. As shown in FIG. 3, the steering knuckle 35 has a king pin 36 formed in the vertical direction and a wheel spindle 37 protruding from the king pin 36 to the outside in the left-right direction of the vehicle body 11. The upper end 38 of the kingpin 36 protrudes upward from the steering knuckle 35, and the lower end 39 of the kingpin 36 protrudes downward from the steering knuckle 35. The steering wheel 22 is rotatably supported by the wheel spindle 37 of the steering knuckle 35.

As shown in FIG. 4, the kingpin 36 has a concave portion 40 having a circular cross section formed downward from the end surface 38A of the upper end portion 38. A cylindrical wall portion 41 is formed on the outer circumference of the recess 40 as a part of the kingpin 36. Therefore, the end face 38A is not only the end face of the upper end portion 38 but also the end face of the wall portion 41. At the bottom of the kingpin 36 in the recess 40, a bottomed insertion hole 42 into which a part of the input shaft 62 described later is inserted is formed.

At the left and right ends of the rear axle 23, an upper boss portion 43 and a lower boss portion 44 as support members are provided so as to be paired vertically. The upper boss portion 43 is formed with a pin hole 45 having an axis in the vertical direction so as to be coaxial with the axis P of the kingpin 36, and the lower boss portion 44 is formed with a pin hole 46 coaxial with the pin hole 45. There is. The upper end 38 of the kingpin 36 is inserted through the pin hole 45, and the kingpin 36 is rotatable with respect to the upper boss 43 via a needle bearing 47 as a bearing. The lower end portion 39 of the kingpin 36 is inserted through the pin hole 46, and the kingpin 36 is rotatable with respect to the lower boss portion 44 via the needle bearing 47. Therefore, the steering knuckle 35 can rotate left and right with respect to the rear axle 23. A thrust bearing 48 is interposed between the steering knuckle 35 and the upper boss portion 43.

As shown in FIG. 4, the rear axle 23 is provided with a steering angle sensor 50 that detects the steering angle of the steering wheel 22. The steering angle sensor 50 is composed of a potentiometer. A sensor bracket 51 is fixed to the upper surface of the upper boss portion 43. The sensor bracket 51 is formed of an iron-based material so as to have a sufficient thickness to satisfy the conditions of explosion-proof specifications. The sensor bracket 51 is fixed to a plate-shaped bracket main body 52, a stepped portion 53 protruding downward from the bracket main body 52, a columnar insertion portion 54 protruding further downward from the stepped portion 53, and a steering angle sensor 50. It has a pedestal portion 55 and the like. Further, the sensor bracket 51 has an insertion hole 56 that penetrates the bracket main body 52, the step portion 53, and the insertion portion 54.

The step portion 53 and the needle bearing 47 are sufficiently close to each other in the axis P direction of the kingpin 36. The fact that the step portion 53 and the needle bearing 47 are sufficiently close to each other in the axis P direction makes it possible to shorten the upper boss portion 43 in the axis P direction. The shortening of the upper boss portion 43 in the axis P direction makes it possible to lengthen the sensor bracket 51 and the sensor cover 70, which will be described later, in the axis P direction by the shortened amount. Further, the step portion 53 faces the end surface 38A of the upper end portion 38 of the kingpin 36.

An annular groove 57 is formed on the surface of the bracket body 52 that comes into contact with the upper boss portion 43. A first O-ring 58 is attached to the annular groove 57. The first O-ring 58 is a sealing member that is interposed between the upper boss portion 43 and the sensor bracket 51 and seals between the pin hole 45 and the outside of the upper boss portion 43. Therefore, the first O-ring 58 prevents water from entering between the sensor bracket 51 and the upper boss portion 43. The bracket body 52 has a communication passage 59 that communicates with the pin hole 45 from the outside of the sensor bracket 51. The communication passage 59 is oriented downward from the first passage portion 59A extending from the outer circumference of the bracket main body 52 toward the center in the radial direction and the central end portion of the first passage portion 59A so as to face the needle bearing 47. It has a second passage portion 59B that opens into the step portion 53 and communicates with the pin hole 45. A grease nipple 60 is attached to the opening facing the outside of the communication passage 59. The communication passage 59 is a passage for supplying the grease injected from the grease nipple 60 to the needle bearing 47. In the present embodiment, the sensor bracket 51 is lengthened (thickened) in the axis P direction as the upper boss portion 43 is shortened in the axis P direction, so that the communication passage 59 can be provided.

The step portion 53 protruding downward from the bracket main body 52 is inserted into the pin hole 45 of the upper boss portion 43 and fits with the upper boss portion 43. The insertion portion 54 that projects further downward from the step portion 53 is inserted into the recess 40 of the kingpin 36. In the state where the insertion portion 54 is inserted into the recess 40, a gap G is formed between the sensor bracket 51 and the kingpin 36 in the recess 40. The steering angle sensor 50 is fixed to the pedestal portion 55 formed on the upper surface of the sensor bracket 51.

In a state where the sensor bracket 51 is fixed to the upper boss portion 43, the insertion hole 56 of the sensor bracket 51 communicates with the pin hole 45 through the gap G. The input shaft 62 is inserted into the insertion hole 56 via the metal bush 61. The input shaft 62 has a shaft main body portion 63, a protrusion 64, a flange portion 65, and a small diameter shaft portion 66.

Most of the shaft body 63 is held by the metal bush 61. The protrusion 64 protrudes from the end of the shaft body 63 and is inserted into the insertion hole 42 of the kingpin 36. The protrusion 64 engages with the kingpin 36 at the insertion hole 42, and the input shaft 62 can rotate integrally with the kingpin 36. The flange portion 65 is formed in the shaft body portion 63 with an enlarged diameter at the end opposite to the end having the protrusion 64. The small-diameter shaft portion 66 is formed so as to project in the axis P direction from the end portion of the shaft body portion 63 on the flange portion 65 side. The steering angle sensor 50 detects an angle based on a resistance value that changes with the rotation of the input shaft 62.

The outer peripheral surface of the shaft main body 63 is not held by the metal bush 61 and has an facing surface facing the insertion portion 54 of the sensor bracket 51 in the insertion hole 56. An annular groove 68 is formed on the facing surface in the circumferential direction. A second O-ring 69 is attached to the annular groove 68. The second O-ring 69 is interposed between the sensor bracket 51 and the shaft body 63 in the insertion hole 56 to prevent the grease that lubricates the needle bearing 47 from leaking to the steering angle sensor 50.

The second O-ring 69 has a smaller diameter than the first O-ring 58 and is provided on the inner peripheral side of the first O-ring 58. Therefore, the second O-ring 69 and the first O-ring 58 are not located above and below each other in the axis P direction of the kingpin 36. Since the second O-ring 69 faces the insertion portion 54, the second O-ring 69 is located in the recess 40 of the kingpin 36 and approaches the gap G between the kingpin 36 and the insertion portion 54 in the recess 40. It becomes the position.

As shown in FIG. 4, a sensor cover 70 is fixed to the upper surface of the sensor bracket 51 by bolts (not shown). The sensor cover 70 is a cover that protects the steering angle sensor 50, and is formed so as to have a sufficient thickness with an iron-based material in order to satisfy the conditions of explosion-proof specifications. The steering angle sensor 50 is housed in a space 71 formed between the sensor bracket 51 and the sensor cover 70. In the present embodiment, the sensor cover 70 is lengthened in the axis P direction as the upper boss portion 43 is shortened in the axis P direction.

Next, the operation of the forklift of the present embodiment will be described. When the steering wheel 16 is operated by the forklift operator during operation, the steering wheel 22 is steered by the operation of the hydraulic cylinder 30 in response to the operation of the steering wheel 16. The king pin 36 is rotated according to the steering of the steering wheel 22, and the input shaft 62 is rotated integrally with the king pin 36. The resistance value of the steering angle sensor 50 changes due to the rotation of the input shaft 62, and the steering angle is detected based on the resistance value of the steering angle sensor 50.

The needle bearing 47 is lubricated by the sealed grease, and this grease can be supplied from the grease nipple 60 to the needle bearing 47 through the communication passage 59. Grease is filled in the gap G between the king pin 36 and the insertion portion 54 of the sensor bracket 51 around the needle bearing 47 in the pin hole 45 and in the recess 40. The grease does not leak to the steering angle sensor 50 beyond the second O-ring 69. The first O-ring 58 prevents water from entering the pin hole 45 from between the upper boss portion 43 and the sensor bracket 51, and also prevents grease from entering between the upper boss portion 43 and the sensor bracket 51. Leakage to the outside is prevented.

According to the forklift of the present embodiment, the following effects are obtained.
(1) The first O-ring 58 prevents grease from leaking from the pin hole 45 to the outside of the upper boss portion 43 and moisture from entering the pin hole 45 from the outside of the upper boss portion 43. The second O-ring 69 prevents the grease in the pin hole 45 from leaking to the steering angle sensor 50. The second O-ring 69 is arranged on the inner peripheral side of the first O-ring 58 and is not located above and below each other, so that the length of the upper boss portion 43 in the axis P direction can be shortened. Therefore, even if the explosion-proof sensor cover 70 is provided, the sensor cover 70 does not interfere with the tire or the wheel. Further, since the length of the upper boss portion 43 in the axis P direction can be shortened, the length of the sensor bracket 51 in the axis P direction can be increased within a range in which the sensor cover 70 does not interfere with the tire or the wheel. This makes it easier to realize the sensor bracket 51 with explosion-proof specifications.

(2) By mounting the second O-ring 69 in the annular groove 68 formed in the input shaft 62, the second O-ring 69 does not shift in the axis P direction. Further, since the second O-ring 69 is mounted on the input shaft 62, the work of assembling the second O-ring 69 is easy.

(3) By providing the communication passage 59 in the sensor bracket 51, grease can be supplied to the needle bearing 47 through the communication passage 59. Therefore, it is not necessary to provide a communication passage for supplying grease to the upper boss portion 43.

(4) The second O-ring 69 faces the insertion portion 54 of the sensor bracket 51 inserted into the recess 40 of the kingpin 36. Therefore, the second O-ring 69 is located in the recess 40, and is located close to the gap G between the kingpin 36 and the insertion portion 54 in the recess 40. Therefore, the second O-ring 69 is provided at a position as far as possible from the steering angle sensor 50, and the leakage of grease to the steering angle sensor 50 can be further prevented.

(5) Since the second O-ring 69 is a small-diameter O-ring mounted on the annular groove 68 of the input shaft 62, it is compared with the case where the second O-ring or lip seal is provided on the outer periphery of the kingpin 36. The manufacturing cost can be reduced.

In the present embodiment, the input shaft 62 is provided with the annular groove 68, but as in the modified example shown in FIG. 5, the annular groove 72 is provided on the inner peripheral surface of the insertion hole 56 of the sensor bracket 51 to provide the annular groove. A second O-ring 69 may be attached to 72. In this case, even if the input shaft 62 cannot be provided with the annular groove, the second O-ring 69 can be provided without being displaced in the axial direction. In the modified example shown in FIG. 5, the other configurations are the same as those in the first embodiment except that the annular groove 72 is provided in the sensor bracket 51 and the annular groove 68 is not provided in the input shaft 62. ..

( Reference example )
Next, the forklift according to the reference example will be described. This reference example differs from the first embodiment in that the second O-ring is interposed between the kingpin and the insertion portion in the recess. In this reference example , the description of the first embodiment is incorporated for the same configuration as that of the first embodiment, and a common reference numeral is used.

As shown in FIG. 6, an annular groove 81 is formed on the outer peripheral surface of the insertion portion 54 of the sensor bracket 51 to be inserted into the recess 40 of the kingpin 36. A second O-ring 82 is mounted on the annular groove 81. The second O-ring 82 is interposed between the inner peripheral surface of the wall portion 41 of the kingpin 36 and the outer peripheral surface of the insertion portion 54 of the sensor bracket 51. The grease that lubricates the needle bearing 47 is blocked by the second O-ring 82 and does not leak to the input shaft 62 on the inner peripheral side of the second O-ring 82. Therefore, leakage of grease to the steering angle sensor 50 is prevented.

According to this reference example , the effects equivalent to those of the first embodiment (1), (3), and (4) are exhibited. Since the second O-ring 82 is a small-diameter O-ring mounted on the annular groove 81 formed on the outer peripheral surface of the insertion portion 54, there is a case where the second O-ring or lip seal is provided on the outer periphery of the kingpin 36. By comparison, the manufacturing cost can be reduced.

In this reference example , an annular groove 81 is formed on the outer peripheral surface of the insertion portion 54, and a second O-ring 82 is attached to the annular groove 81, but the insertion is performed as in the modified example shown in FIG. An annular groove 83 may be formed on the end surface of the portion 54, and a second O-ring 84 may be attached to the annular groove 83. In this case, a second O-ring 84 is interposed between the kingpin 36 in the recess 40 and the insertion portion 54 of the sensor bracket 51. Therefore, since the grease lubricating the needle bearing 47 is blocked by the second O-ring 82, it is possible to prevent the grease from leaking to the input shaft 62 on the inner peripheral side of the second O-ring 84.

The present invention is not limited to the above-described embodiment (including modifications), and various modifications can be made within the scope of the gist of the invention. For example, the present invention may be modified as follows.

-In the above embodiment (including a modification), an explosion-proof forklift has been described as an industrial vehicle, but the industrial vehicle is not limited to the explosion-proof specification, and the present invention may be applied to an industrial vehicle having normal specifications.
○ In the above embodiment (including a modified example), an annular groove to which the second O-ring is mounted is provided, but the annular groove is not an essential configuration. When the annular groove is not provided, it is preferable to position the second O-ring by providing a step at the mounting destination.
○ In the above embodiment (including a modified example), a communication path for supplying grease is formed in the sensor bracket, but this is not the case. The communication passage for supplying grease may be formed in the support member so as to be supplied to the bearing (needle bearing), for example .

11 Body 12 Cargo handling device 20 Drive wheels 22 Steering wheels 23 Rear axle (as axle beam)
36, 93 Kingpin 38 Upper end 38A End face 40 Recess 42 Insertion hole 43 Upper boss (as a support member)
45, 46, 92 Pin holes 47, 94 Needle bearings (as bearings)
50, 96 Steering angle sensor 51, 95 Sensor bracket 54 Insertion part 56, 98 Insertion hole 57, 68, 72, 81, 83 Circular groove 58 First O-ring 59, 100 Communication passage 62, 97 Input shaft 69, 82, 84 Second O-ring 70, 103 Sensor cover 71 Space 90 Rear axle 91 Upper boss 99 Lip seal 102 O-ring G Gap P Axle

Claims (4)

A support member provided on the axle beam and having a pin hole,
A king pin that is inserted through the pin hole and rotatably supported by the support member via a bearing.
A sensor bracket that is fixed to the upper part of the support member and has an insertion hole that communicates with the pin hole.
A steering angle sensor fixed to the sensor bracket to detect the steering angle,
In an industrial vehicle provided with an input shaft fixed to the upper end of the kingpin, inserted into the insertion hole, and connected to the steering angle sensor.
A first O-ring interposed between the support member and the sensor bracket and sealing between the pin hole and the outside of the support member.
An industrial vehicle provided with a second O-ring provided on the inner peripheral side of the first O-ring and interposed between the input shaft and the sensor bracket in the insertion hole. The industrial vehicle according to claim 1, further comprising an annular groove formed on the outer peripheral surface of the input shaft and to which the second O-ring is mounted. The industrial vehicle according to claim 1 , further comprising an annular groove provided on the inner peripheral surface of the insertion hole of the sensor bracket and to which the second O-ring is mounted . The industrial vehicle according to any one of claims 1 to 3, which is formed on the sensor bracket and has a communication passage that communicates the outside of the sensor bracket with the pin hole .

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