JP2004074847A - Telescopic axle - Google Patents

Abstract

A telescopic axle having a lock mechanism that has a very simple structure and can significantly reduce the labor and cost required for manufacturing and maintenance.
A movable shaft (12) is axially movable on a guide shaft (11), a hydraulic cylinder (13) moves the movable shaft (12) relative to the guide shaft (11), and a movable shaft (12) relative to the guide shaft (11). In a telescopic axle provided with a lock mechanism for fixing the position of the shaft 12 in the axial direction, the lock mechanism is provided by projecting from a lock lever 14 fixed to the guide shaft 11 and a connecting member 15 fixed to the movable shaft 12. A lock pin 15a for locking the lock lever 14 when the hydraulic cylinder 13 is not extended, and one end of the hydraulic cylinder 13 is pivotally attached to the connecting member 15 at an intermediate portion, A lock release lever 16 for rotating the lock lever 14 on the end side to release the locked state between the lock lever 14 and the lock pin 15a is provided.
[Selection diagram] Fig. 3

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a telescopic axle, and more particularly to a telescopic axle provided with a lock mechanism for axially fixing an inner axle to an outer axle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, vehicle carriers for land transport of automobiles and the like have been used. At present, a vehicle carrier equipped with a telescopic axle, which facilitates the loading / unloading operation of a wide vehicle by extending the axle of the wheel outward to increase the wheel interval (tread), has been proposed and put into practical use.
[0003]
The vehicle carrier equipped with such a telescopic axle, when loading and unloading a car, extends the telescopic axle after jacking up the car body and moves the wheels to the outside of the car body, thereby causing interference between the car to be unloaded and the wheels. It is to prevent. Further, during traveling, the telescopic axle can be shortened and returned to the original wheel interval.
[0004]
In recent years, a lock mechanism for maintaining the telescopic axle in a non-extended state (or an extended state) has been proposed. For example, a mechanism for fixing a telescopic axle composed of an outer axle having a cylindrical section with an irregular cross-section and an inner axle slidably disposed inside thereof at a predetermined lock position by a lock pin driven by a hydraulic cylinder. (See Japanese Patent No. 2727511).
[0005]
[Problems to be solved by the invention]
However, when the above-described lock mechanism is adopted, it is necessary to prepare a hydraulic cylinder for driving the lock pin, and accordingly, it is necessary to provide an electric circuit or the like for driving the hydraulic cylinder for driving the lock pin. there were. Therefore, the number of components of the lock mechanism increases, and the structure becomes complicated.
[0006]
An object of the present invention is to provide a telescopic axle having a lock mechanism that is extremely simple in structure and can significantly reduce the labor and cost required for manufacturing and maintenance.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is characterized in that a cylindrical outer axle, an inner axle inserted axially movably at both axial ends of the outer axle, and a telescopic operation. A telescopic axle comprising: a telescopic cylinder that moves the inner axle in the axial direction with respect to the outer axle; and a lock mechanism that fixes the inner axle in the axial direction with respect to the outer axle. A locking member pivotally mounted on the outer axle; a locked portion provided on the inner axle for locking the locking member when the telescopic cylinder is not extended; And an intermediate portion is pivotally attached to the inner axle, and is rotated in accordance with the extension operation of the telescopic cylinder, whereby the locking member is rotated at the other end to engage with the locked portion. A rotating member for releasing the stop state; Characterized in that it obtain.
[0008]
According to the first aspect of the present invention, the locking mechanism includes a locking member pivotally mounted on the outer axle and a locked member provided on the inner axle and locking the locking member when the telescopic cylinder is not extended. The inner axle can be axially fixed to the outer axle when the telescopic cylinder is not extended (ie, when the telescopic axle is not extended).
[0009]
Therefore, the lock effect can be obtained without providing a conventionally used hydraulic cylinder for driving the lock pin and an electric circuit for driving the lock cylinder. As a result, the number of parts can be significantly reduced, the structure of the lock mechanism can be significantly simplified, and the labor and cost required for manufacturing the lock mechanism can be significantly reduced. In addition, since the structure is simple, it is excellent in maintainability.
[0010]
According to the first aspect of the present invention, since the lock mechanism includes the specific rotating member having one end pivotally attached to the telescopic cylinder, the locking member is rotated with the extension operation of the telescopic cylinder. By rotating the locking member in a predetermined direction at the other end of the rotating member, the locked state between the locking member and the locked portion can be easily released. That is, the lock release function can be easily realized by effectively using the initial stroke of the telescopic cylinder.
[0011]
According to a second aspect of the present invention, in the telescopic axle according to the first aspect, the rotating member is rotated with an extension operation of the telescopic cylinder to rotate the locking member and the locked portion. After releasing the locked state, the extension operation of the telescopic cylinder is changed to the axial movement of the inner axle by abutting on the first fixing portion provided on the inner axle to prevent its rotation operation. It is characterized by making it.
[0012]
According to the second aspect of the present invention, the rotating member is provided on the inner axle after being rotated with the extension operation of the telescopic cylinder to release the locked state between the locking member and the locked portion. The extension operation of the telescopic cylinder can be changed to the axial movement of the inner axle by contacting the first fixed portion and preventing its rotation. That is, the force (pressing force) resulting from the extension operation of the telescopic cylinder can be transmitted to the inner axle. Accordingly, the inner axle can be moved in a direction (outward) away from the outer axle.
[0013]
According to a third aspect of the present invention, in the telescopic axle according to the first or second aspect, the rotary member is provided on the inner axle when the rotary member is rotated in accordance with a shortening operation of the telescopic cylinder. The rotation of the telescopic cylinder is changed to the axial movement of the inner axle by abutting the fixed portion to prevent the rotation thereof.
[0014]
According to the third aspect of the present invention, the turning member abuts on the second fixed portion when the turning member is turned in accordance with the shortening operation of the telescopic cylinder, and the turning operation is prevented, whereby the telescopic cylinder is moved. Can be changed to the axial movement of the inner axle. That is, the force (tensile force) resulting from the shortening operation of the telescopic cylinder can be transmitted to the inner axle. Therefore, the inner axle can be moved in a direction (inward) to approach the outer axle.
[0015]
According to a fourth aspect of the present invention, in the telescopic axle according to any one of the first to third aspects, the locking member is urged in a direction to continue the locked state with the locked portion. The turning member holds the unlocked state between the locking member and the locked portion until the inner axle moves left and right outward by a predetermined distance.
[0016]
According to the fourth aspect of the present invention, since the locking member is urged in a direction to continue the locked state with the locked portion, the engagement between the locking member and the locked portion is maintained. Stability can be stabilized and reliability can be improved. Further, the rotating member keeps the unlocking state between the locking member and the locked portion until the inner axle moves left and right outward by a predetermined distance, so that the width of the wheel interval (tread) is surely increased. It can be carried out.
[0017]
According to a fifth aspect of the present invention, in the telescopic axle according to the fourth aspect, the locking member has inclined end surfaces at left and right outer ends, and the inner axle is moved inward by a shortening operation of the telescopic cylinder. When the locked portion contacts the inclined end surface when moving in the direction, the locking member is rotated against the bias.
[0018]
According to the fifth aspect of the present invention, the locking member has inclined end surfaces at the left and right outer ends, and is locked when the inner axle moves inward by the shortening operation of the telescopic cylinder. Since the portion abuts on the inclined end surface, the locking member can be rotated against the above-described bias, so that the locking member does not hinder shortening of the wheel interval (tread).
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
First, a schematic configuration of a suspension device including a telescopic axle 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view (a view from above) of a suspension device including a telescopic axle 10 according to the present embodiment, and FIG. 2 is a view of the suspension device shown in FIG. 1 as viewed from the direction of arrow II. It is. In the following description, the direction of arrow A in FIG. 1 will be referred to as “front”, the direction of arrow B as “rear”, the direction of arrow C as “right”, and the direction of arrow D as “left”. Since the suspension system including the telescopic axle 10 has a substantially symmetric structure, only the left structure will be described in the present embodiment.
[0021]
As shown in FIGS. 1 and 2, the telescopic axle 10 according to the present embodiment includes a guide shaft 11, a movable shaft 12, a telescopic cylinder 13, a lock mechanism, and the like.
[0022]
The guide shaft 11 is a square tube arranged in a state extending in the left-right direction above a leaf spring 30 described later, and is an outer axle in the present invention. A lock lever 14, which constitutes a lock mechanism described later, is attached to a part of the outer periphery of the guide shaft 11 so as to be rotatable about a rotation shaft 14a.
[0023]
The movable shaft 12 is a cylindrical body movably inserted in the left and right ends of the guide shaft 11 so as to be movable in the axial direction, and is an inner axle in the present invention. A movable shaft extending / contracting arm 15 for connecting the movable shaft 12 and the hydraulic cylinder 13 is attached to a part of the outer periphery of the movable shaft 12. An arm 12a is fixed upward at the left end of the movable shaft 12, and a wheel support shaft 12b projects from the upper portion of the arm 12a to the left outside.
[0024]
The hydraulic cylinder 13 is connected to the movable shaft 12 via a lock release lever 16 and a movable shaft extending / contracting arm 15 which constitute a lock mechanism described later, and moves the movable shaft 12 in the axial direction with respect to the guide shaft 11 by the extension / contraction operation. Performs the function of causing That is, the hydraulic cylinder 13 is the telescopic cylinder in the present invention.
[0025]
The lock mechanism is a main part of the present invention and has a function of fixing the position of the movable shaft 12 in the axial direction with respect to the guide shaft 11. Hereinafter, the configuration of the lock mechanism will be described with reference to FIGS. FIG. 3 is an enlarged view of a portion near the lock mechanism (a portion III in FIG. 1), and FIG. 4 is a cross-sectional view along a line IV-IV in FIG.
[0026]
The lock mechanism includes a lock lever 14, a lock pin 15a, a lock release lever 16, and the like.
[0027]
The lock lever 14 is a locking member according to the present invention that is rotatably attached to a part of the guide shaft 11 by a rotation shaft 14a. The lock lever 14 has a hook portion 14b which is locked to a lock pin 15a of the arm 15 for movable shaft expansion and contraction. The hook portion 14b is urged in the counterclockwise direction in FIG. 3 by the coil spring 14c. Further, the lock lever 14 includes a pin 14d which is pressed forward (upward on the plane of FIG. 3) by the pressing portion 16c when the lock release lever 16 rotates counterclockwise in FIG.
[0028]
The lock pin 15a is a locked portion of the present invention protruding from a part of the arm 15 for movable shaft expansion and contraction. The lock pin 15a functions to lock the hook portion 14b of the lock lever 14 when the hydraulic cylinder 13 is not extended. In addition to the lock pin 15a described above, the movable shaft extending / contracting arm 15 includes a first fixing portion 15b that makes contact with a first contact portion 16d (described later) of the lock release lever 16, and a lock release lever 16 And a second fixing portion 15c for making the second contact portion 16e (to be described later) come into contact therewith.
[0029]
One end of the lock release lever 16 is rotatably attached to a movable shaft side end 13 a of the hydraulic cylinder 13 by a rotation shaft 16 a, and an intermediate portion thereof is connected to a part of the arm 15 for movable shaft expansion and contraction by a rotation shaft. 16b is a rotation member according to the present invention rotatably mounted at 16b. The lock release lever 16 rotates in the counterclockwise direction in FIG. 3 with the extension operation of the hydraulic cylinder 13, thereby rotating the lock lever 14 in the clockwise direction in FIG. The function of releasing the locked state between the hook portion 14b and the lock pin 15a is achieved.
[0030]
When the lock release lever 16 rotates counterclockwise in FIG. 3 around the rotation shaft 16b with the extension operation of the hydraulic cylinder 13, the pin 14d of the lock lever 14 moves forward (upward in FIG. 3). ) Is provided. The lock release lever 16 is rotated in the counterclockwise direction in FIG. 3, and the pin 14 d of the lock lever 14 is pressed forward (upward on the plane of FIG. 3) by the pressing portion 16 c, so that the lock lever 14 is rotated in the clock of FIG. By rotating in the circumferential direction, the locked state of the hook portion 14b of the lock lever 14 and the lock pin 15a can be released.
[0031]
Further, the lock release lever 16 rotates counterclockwise in FIG. 3 around the rotation shaft 16b with the extension operation of the hydraulic cylinder 13 to lock the hook portion 14b of the lock lever 14 with the lock pin 15a. After the state is released, a first contact portion 16d that comes into contact with the first fixed portion 15b of the arm 15 for movable shaft expansion and contraction is provided. By pressing the first contact portion 16d of the lock release lever 16 against the first fixed portion 15b of the movable shaft extending / contracting arm 15, the pressing force due to the extension operation of the hydraulic cylinder 13 can be transmitted to the movable shaft 12. it can. As a result, the movable shaft 12 can be moved outward (in a direction away from the guide shaft 11).
[0032]
Further, when the lock release lever 16 is rotated clockwise in FIG. 3 around the rotation shaft 16b with the shortening operation of the hydraulic cylinder 13, the lock release lever 16 contacts the second fixed portion 15c of the movable shaft extending / contracting arm 15. A second contact portion 16e is provided in contact with the second contact portion 16e. By bringing the second contact portion 16e of the lock release lever 16 into contact with the second fixing portion 15c of the movable shaft extending / contracting arm 15, the pulling force due to the shortening operation of the hydraulic cylinder 13 can be transmitted to the movable shaft 12. it can. As a result, the movable shaft 12 can be moved inward (in a direction approaching the guide shaft 11).
[0033]
The lock mechanism of the telescopic axle 10 according to the present embodiment is provided with an axle storage detection limit switch 17. The axle storage detecting limit switch 17 is provided on the vehicle (not shown) when the limit lever 17a detects whether or not the telescopic axle 10 is in the extended state and determines that the telescopic axle 10 is in the extended state. This limits the shortening of the outrigger. That is, the axle storage detection limit switch 17 functions to limit the shortening of the outrigger when the telescopic axle 10 is in the extended state, thereby preventing the vehicle from erroneously starting.
[0034]
In the present embodiment, as shown in FIG. 3, the axle storage detection limit switch 17 is attached to a part of the lock lever 14, and the tip of the limit lever 17a contacts the part of the movable shaft telescopic arm 15. In contact. In the state shown in FIG. 3, since the telescopic axle 10 is in the non-extended state and the hook portion 14b of the lock lever 14 and the lock pin 15a are in the engaged state, the outrigger is shortened by the axle storage detection limit switch 17. Is not restricted.
[0035]
On the other hand, when the lock release lever 16 and the lock lever 14 rotate with the extension of the hydraulic cylinder 13 and the engagement between the hook portion 14b of the lock lever 14 and the lock pin 15a is released, the tip of the limit lever 17a is released. Is separated from a part of the movable shaft extending / contracting arm 15. The axle storage detection limit switch 17 detects that the limit lever 17a has been separated from the movable shaft telescopic arm 15, determines that the telescopic axle 10 is in the extended state, and limits the shortening of the outrigger.
[0036]
As shown in FIGS. 1 and 2, the wheel 20, the leaf spring 30, the front cross member 41, the rear cross member 42, the air spring 50 and the like are arranged around the telescopic axle 10 described above. Is configured.
[0037]
The wheel 20 is rotatably supported by a wheel support shaft 12b of the telescopic axle 10. The wheels 20 move in the same direction as the movable shaft 12 moves outward and inward.
[0038]
The leaf spring 30 is made of a long steel plate as shown in FIGS. 1 and 2, and the upper part near the center in the front-rear direction is fixed to the lower part of the movable shaft 12 and is transmitted to the vehicle body by elastic deformation. Performs the function of cushioning impact. The front end 31 of the leaf spring 30 is supported by a leaf spring supporting portion 41a of a front cross member 41 described later. An air spring 50 is connected to an upper portion of the rear end portion 32 of the leaf spring 30, and the upper portion of the air spring 50 is supported by an air spring upper support arm 42a of a rear cross member 42 described later.
[0039]
The front cross member 41 and the rear cross member 42 are long members extending in the left-right direction, and are arranged parallel to each other on the outer side in the front-rear direction of the wheel 20 to constitute a part of the vehicle body. The front cross member 41 and the rear cross member 42 are connected by a frame (not shown) extending in the front-rear direction.
[0040]
The front cross member 41 is provided with a leaf spring supporting portion 41 a that supports the front end 31 of the leaf spring 30. Further, the rear cross member 42 is provided with an air spring upper support arm 42a that supports the upper part of the air spring 50 connected to the upper part of the leaf spring 30 from above.
[0041]
The air spring 50 is connected to the upper part of the leaf spring 30 and the upper part is supported by the air spring upper support arm 42a of the rear cross member 42, so that the impact transmitted to the vehicle body by the elastic deformation is reduced. Perform the function of doing.
[0042]
Next, the operation of the lock mechanism of the telescopic axle 10 according to the present embodiment will be described with reference to FIG. FIG. 5 is an explanatory diagram for explaining the operation of the lock mechanism. FIG. 5A shows a state (locked state) of the lock mechanism when the hydraulic cylinder 13 is not extended. FIG. 5B shows a state in which the hydraulic cylinder 13 is slightly extended and the hook of the lock lever 14 is hooked. (C) shows a state in which the movable cylinder 12 is moved by further extending the hydraulic cylinder 13 from the state shown in (b), in which the locked state between the portion 14b and the lock pin 15a is released. It is shown.
[0043]
First, when the hydraulic cylinder 13 is in the non-extended state, as shown in FIGS. 3 and 5A, the hook portion 14b of the lock lever 14 attached to the guide shaft 11 is It is locked to a lock pin 15a protruding from the shaft extending / contracting arm 15. Therefore, the movable shaft 12 is axially fixed to the guide shaft 11 (locked state).
[0044]
From the state of FIG. ₁ 5B, the lock release lever 16 attached to the movable shaft side end 13a of the hydraulic cylinder 13 so as to be rotatable about the rotation shaft 16a as shown in FIG. In the counterclockwise direction of FIG. ₁ Direction). Then, the pin 14d of the lock lever 14 is pressed upward in the drawing of FIG. 5B by the pressing portion 16c of the lock release lever 16, and the lock lever 14 moves the rotating shaft 14a against the urging force of the coil spring 14c. In the center, the clockwise direction of FIG. ₂ Direction).
[0045]
As a result, the locked state between the hook portion 14b of the lock lever 14 and the lock pin 15a is released, and the locked state of the guide shaft 11 with respect to the movable shaft 12 is released (unlocked state). That is, the initial stroke h of the hydraulic cylinder 13 in the present embodiment ₁ Is used not to move the movable shaft 12, but to shift from the locked state shown in FIG. 5A to the unlocked state shown in FIG. 5B.
[0046]
When the unlocked state shown in FIG. 5B is reached, the first abutting portion 16d of the unlocking lever 16 abuts on the first fixed portion 15b of the arm 15 for movable shaft expansion and contraction. For this reason, when the hydraulic cylinder 13 is further extended from the unlocked state shown in FIG. 5B, the pressing force due to the extension operation of the hydraulic cylinder 13 (moves the movable shaft 12 to the left in FIG. 5B on the paper surface). Force) can be transmitted to the movable shaft 12 via the movable shaft telescopic arm 15. As a result, the movable shaft 12 can be moved relatively to the guide shaft 11.
[0047]
Further, when the state changes from the locked state shown in FIG. 5A to the unlocked state shown in FIG. 5B, the tip of the limit lever 17a is separated from a part of the arm 15 for movable shaft expansion and contraction. As a result, the function of the axle storage detection limit switch 17 limits the shortening of the outrigger.
[0048]
FIG. 5C shows that the hydraulic cylinder 13 is further moved from the state of FIG. ₂ FIG. 5C illustrates a state in which the hydraulic cylinder 13, the lock release lever 16, and the movable shaft extending / contracting arm 15 are integrally moved to the left in FIG. 5C.
[0049]
When the lock release lever 16 moves to the left in FIG. 5C, the pressing portion 16 c holds the pin 14 d of the lock lever 14 by a predetermined dimension, so that the lock pin of the arm 15 15a can pass through the side of the hook portion 14b of the lock lever 14. That is, the pressing portion 16c of the lock release lever 16 also functions as a lock pin passage holding portion.
[0050]
When the hydraulic cylinder 13 is further extended from the state shown in FIG. 5C, the pin 14d of the lock lever 14 is disengaged from the pressing portion 16c of the lock release lever 16, and the lock lever 14 is moved by the urging force of the coil spring 14c as shown in FIG. Rotate counterclockwise in c). At this time, the lock pin 15a has already moved to the left side in FIG. 5C with respect to the hook portion 14b of the lock lever 14.
[0051]
Conversely, when the hydraulic cylinder 13 is shortened from the state shown in FIG. 5C, the lock release lever 16 rotates clockwise in FIG. The second contact portion 16e of the lock release lever 16 abuts on the second fixed portion 15c. For this reason, the pulling force (the force for moving the movable shaft 12 rightward on the paper surface of FIG. 5C) due to the shortening operation of the hydraulic cylinder 13 can be transmitted to the movable shaft 12 via the movable shaft telescopic arm 15. it can. As a result, the movable shaft 12 can be moved relative to the guide shaft 11.
[0052]
The pulling force due to the shortening operation of the hydraulic cylinder 13 is transmitted to the movable shaft 12, and when the hydraulic cylinder 13, the lock release lever 16 and the movable shaft extending / contracting arm 15 move integrally to the right in the drawing of FIG. By the lock pin 15a of the arm 15 for extending and retracting the shaft, the inclined end surface of the hook portion 14b of the lock lever 14 is pressed from the left side of the paper of FIG. 5C and pushed up, and the lock lever 14 is drawn around the rotation shaft 14a. It turns clockwise in 5 (c). Then, the lock pin 15a is engaged with the hook portion 14b of the lock lever 14 that has been pushed up, and the lock state shown in FIG.
[0053]
In the telescopic axle 10 according to the present embodiment, the lock mechanism includes a lock lever 14 mounted on the guide shaft 11, and a movable shaft telescopic arm 15 fixed to the movable shaft 12. And a lock pin 15a for locking the lock lever 14 when the lock lever 14 is not extended. For this reason, when the hydraulic cylinder 13 is not extended (ie, when the telescopic axle 10 is not extended), the lock lever 14 of the guide shaft 11 is locked to the lock pin 15 a of the arm 15 for movable shaft extension and contraction, and In contrast, the position of the movable shaft 12 can be fixed in the axial direction.
[0054]
Therefore, the lock effect can be obtained without providing a conventionally used hydraulic cylinder for driving the lock pin and an electric circuit for driving the lock cylinder. As a result, the number of parts can be significantly reduced, the structure of the lock mechanism can be significantly simplified, and the labor and cost required for manufacturing the lock mechanism can be significantly reduced. In addition, since the structure is simple, it is excellent in maintainability.
[0055]
Further, in the telescopic axle 10 according to the present embodiment, the lock mechanism includes a lock release lever 16 pivotally mounted on the movable shaft side end 13 a of the hydraulic cylinder 13 and the movable shaft telescopic arm 12. Therefore, the lock lever 14 is rotated in a predetermined direction (counterclockwise in FIG. 3) by rotating the lock release lever 16 in accordance with the extension operation of the hydraulic cylinder 13, and the hook portion 14 b of the lock lever 14 is rotated. The lock state between the lock pin 15a and the lock pin 15a can be released. That is, the initial stroke h of the hydraulic cylinder 13 ₁ Can be used effectively to easily realize the lock release function.
[0056]
In the telescopic axle 10 according to the present embodiment, the movable shaft telescopic arm 15 has the first fixing portion 15b, and the lock release lever 16 rotates and locks with the extension operation of the hydraulic cylinder 13. The lever 14 has a first contact portion 16d that comes into contact with the first fixing portion 15b after releasing the locked state between the hook portion 14b of the lever 14 and the lock pin 15a. Therefore, by pressing the first contact portion 16d of the lock release lever 16 against the first fixed portion 15b of the movable shaft extending / contracting arm 15, the pressing force accompanying the extension operation of the hydraulic cylinder 13 is transmitted to the movable shaft 12. The movable shaft 12 can be moved in a direction to separate from the guide shaft 11.
[0057]
Also, in the telescopic axle 10 according to the present embodiment, the movable shaft telescopic arm 15 has the second fixing portion 15c, and the lock release lever 16 is rotated when the hydraulic cylinder 13 is shortened by the shortening operation. It has a second contact portion 16e that contacts the second fixing portion 15c. Therefore, the pulling force accompanying the shortening operation of the hydraulic cylinder 13 is transmitted to the movable shaft 12 by bringing the second contact portion 16 e of the lock release lever 16 into contact with the second fixed portion 15 c of the arm 15 for extending and retracting the movable shaft. The movable shaft 12 can be moved in a direction to approach the guide shaft 11.
[0058]
【The invention's effect】
According to the first aspect of the present invention, the lock mechanism includes the locking member pivotally mounted on the outer axle, and the locked portion that locks the locking member when the telescopic cylinder is not extended. Therefore, a predetermined locking effect can be obtained without providing a conventionally used hydraulic cylinder for driving a lock pin or the like. Therefore, the number of parts can be greatly reduced, and the structure of the lock mechanism can be significantly simplified, and the labor and cost required for manufacturing the lock mechanism can be significantly reduced. In addition, since the lock mechanism includes a specific rotating member that is pivotally mounted on the telescopic cylinder, the lock release function can be easily realized by effectively using the initial stroke of the telescopic cylinder.
[0059]
According to the invention described in claim 2, the rotating member is rotated with the extension operation of the telescopic cylinder to release the locked state between the locking member and the locked portion, and then to the inner axle. By contacting the first fixed portion provided, the pressing force generated by the extension operation of the telescopic cylinder is transmitted to the inner axle, and the inner axle can be moved in a direction to be separated from the outer axle.
[0060]
According to the third aspect of the present invention, when the rotating member is rotated in accordance with the shortening operation of the telescopic cylinder, it contacts the second fixing portion provided on the inner axle, thereby shortening the telescopic cylinder. The tensile force from the operation can be transmitted to the inner axle to move the inner axle closer to the outer axle.
[0061]
According to the fourth aspect of the present invention, since the locking member is urged in a direction in which the locked state with the locked portion is continued, the locked state is stabilized to enhance reliability. be able to. Further, the rotating member keeps the unlocking state between the locking member and the locked portion until the inner axle moves left and right outward by a predetermined distance, so that the width of the wheel interval (tread) is surely increased. It can be carried out.
[0062]
According to the fifth aspect of the present invention, the locking member has inclined end surfaces at the left and right outer ends, and the locked portion contacts the inclined end surface when the inner axle moves inward. The contact makes it possible to rotate the locking member against the bias, so that the locking member does not hinder shortening of the wheel interval (tread).
[Brief description of the drawings]
FIG. 1 is a plan view (a view from above) of a suspension device including a telescopic axle according to the present embodiment.
FIG. 2 is a view of the suspension device shown in FIG. 1 as viewed from a direction of an arrow II.
FIG. 3 is an enlarged view of a portion III in FIG. 1;
FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;
5A and 5B are diagrams for explaining the operation of the lock mechanism of the telescopic axle according to the present embodiment, wherein FIG. 5A is an explanatory view showing a locked state by the lock mechanism, and FIG. 5B is a view shown in FIG. Explanatory view showing a state in which the hydraulic cylinder is slightly extended from the locked state and shifted to an unlocked state, and FIG. 3C is an explanatory view showing a state in which the hydraulic cylinder is further extended from the unlocked state shown in FIG. It is.
[Explanation of symbols]
10 Telescopic axle
11 Guide shaft
12 Movable axis
12a arm
12b Wheel support shaft
13 Hydraulic cylinder
14 Lock lever
14a Rotating axis
14b hook
14c coil spring
14d pin
15 Moving shaft telescopic arm
15a Lock pin
15b 1st fixing part
15c 2nd fixed part
16 Lock release lever
16a Rotating axis
16b Rotation axis
16c pressing part
16d first contact part
16e 2nd contact part
17 Axle storage detection limit switch
17a Limit lever
20 wheels
30 leaf spring
31 Front end
32 rear end
41 Front cross member
41a leaf spring support
42 Rear cross member
42a Air spring upper support arm
50 air spring

Claims (5)

A tubular outer axle, an inner axle axially movably inserted at both axial ends of the outer axle, and a telescopic cylinder for axially moving the inner axle relative to the outer axle by a telescopic operation. A locking mechanism that axially fixes the inner axle relative to the outer axle,
The lock mechanism,
A locking member pivotally mounted on the outer axle;
A locked portion provided on the inner axle for locking the locking member when the telescopic cylinder is not extended,
One end of the telescopic cylinder is axially mounted, and an intermediate part is axially mounted on the inner axle. By rotating with the extension operation of the telescopic cylinder, the locking member is rotated at the other end. A rotating member for releasing a locked state with the locked portion;
A telescopic axle comprising: The rotating member,
After the telescopic cylinder is rotated in accordance with the extension operation of the telescopic cylinder to release the locked state of the locking member and the locked part, the telescopic cylinder comes into contact with a first fixing part provided on the inner axle to rotate the locking part. The telescopic axle according to claim 1, wherein the movement operation is prevented, whereby the extension operation of the telescopic cylinder is changed to the axial movement of the inner axle. The rotating member,
When the telescopic cylinder rotates along with the shortening operation, the telescopic cylinder comes into contact with a second fixing portion provided on the inner axle to prevent the turning operation, thereby shortening the telescopic cylinder. The telescopic axle according to claim 1 or 2, wherein the movement is changed to the axial movement. The locking member,
Biased in a direction to continue the locked state with the locked portion,
The rotating member,
The lock release state between the locking member and the locked portion is maintained until the inner axle moves left and right outward by a predetermined distance, according to any one of claims 1 to 3, wherein The telescopic axle as described. The locking member,
It has an inclined end face at its left and right outer ends,
When the inside axle moves inward due to the shortening operation of the telescopic cylinder, the locked portion comes into contact with the inclined end surface, thereby rotating the locking member against the bias. The telescopic axle according to claim 4, characterized in that:

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