JP5578590B1 - Forklift suspension system - Google Patents

Abstract

A suspension device for a forklift capable of preventing the front wheel on the left side of a vehicle body from floating during a sudden left turn and lowering the position of a driver's seat is provided.
A suspension device (10) includes a drive unit (20) including a drive wheel (21), a caster unit (30) including a caster wheel (31), a vehicle body frame (70), and each unit (20, 30) suspended in a vertically swingable manner with respect to the vehicle body frame. And a cylinder device 50 that can be in a locked state and a buffered state. The link mechanism includes an upper link 41 having one end 41a and the other end 41b attached to the drive unit and the vehicle body frame, respectively, and one end. 42a is disposed below the upper link, and the other end portion 42b includes a caster link 42 attached to the caster unit, and an under link 43 that supports the caster link so as to swing up and down. It arrange | positions between an edge part and the one end part of a caster link.
[Selection] Figure 2

Description

  The present invention relates to a suspension device for a forklift, and more particularly to a suspension device for a rear wheel of a forklift in which a drive wheel and a caster wheel are provided at a rear portion of a vehicle body.

Conventionally, for example, as shown in Patent Document 1 (hereinafter described using the reference numerals in FIGS. 1 and 2 of Patent Document 1), a drive wheel (drive wheel) 51 and A suspension device (suspension device) 10 for a rear wheel of a forklift provided with caster wheels (auxiliary wheels) 56 is known.
The suspension apparatus 10 includes a drive unit 50 including a drive wheel 51, a caster unit 55 including a caster wheel 56, a vehicle body frame 54 that forms a driver's seat, and a drive unit 50 and a caster unit 55 that move up and down relative to the vehicle body frame 54. And a cylinder device 20 that can enter a locked state (off state) and a buffer state (on state).

The link mechanism 30 includes a first link 31, a second link 32, a third link 33, and a fourth link 34.
One end of the first link 31 is attached to the drive unit 50. The other end of the first link 31 is attached to the vehicle body frame 54 via a first fixed node 311.
One end of the second link 32 is disposed below the other end of the first link 31.
The third link 33 connects the other end of the first link 31 and one end of the second link 32.
One end of the fourth link 34 is attached to the vehicle body frame 54 via a third fixed node 341. The other end of the fourth link 34 is connected to the second link 32 via a caster spring 551 and attached to the caster unit 55.

A lower end 202 of the cylinder device 20 is attached to one end (extension 315) of the first link 31. An upper end 201 of the cylinder device 20 is attached to the vehicle body frame 54.
The cylinder device 20 includes an opening / closing valve 25. The on-off valve 25 can block or conduct the hydraulic oil passage of the cylinder 21 in accordance with a signal from an acceleration sensor 40 (controller) provided on the vehicle body.

According to the suspension device 10, when the forklift makes a sudden turn (when the acceleration sensor 40 detects an acceleration equal to or higher than a predetermined turning acceleration), the open / close valve 25 is closed to shut off the oil passage, and the cylinder device 20 is locked. Therefore, the stability of the vehicle body can be secured.
Further, according to the suspension device 10, the opening / closing valve 25 is opened and the oil passage is made conductive in the normal time when there is no sudden turn (when the acceleration sensor 40 does not detect an acceleration higher than a predetermined turning acceleration), the cylinder device 20 Since it is in a buffered state, the ride comfort can be secured.

By the way, in this forklift, in addition to the drive wheel 51 and the caster wheel 56, front wheels (road wheels) (not shown) are provided on the left and right sides of the front part of the vehicle body. In this forklift, the link length of the link mechanism 30 and the spring force of the caster spring 551 and the like are adjusted so that the vehicle weight is greater on the drive wheel 51 than on the caster wheel 56.
However, in this suspension device 10, the cylinder device 20 is locked during a sudden turn, and the stability of the vehicle body is secured to some extent. However, during a sudden left turn, due to the inertia of the vehicle body, the drive wheel 51 to the caster wheel 56. The center of gravity moves to the side, the caster spring 551 between the second link 32 and the fourth link 34 bends, the vehicle body is tilted by the amount of deflection of the caster spring 551, and the left front wheel floats off the ground. was there.

For example, as shown in Patent Document 2 (hereinafter described using the reference numerals in FIGS. 1 and 2 of Patent Document 2), the caster wheel 3 is locked, and the front wheel (not shown) on the left side of the vehicle body is locked. A forklift suspension device (travel stabilization device) that can prevent the floating) is also known.
This suspension device suspends a drive unit (drive device) 1 including a drive wheel (drive wheel) 1A and a caster unit including a caster wheel (auxiliary wheel) 3 so as to swing up and down with respect to a vehicle body frame (vehicle body) 7. And a cylinder device (cylinder) 11 that can enter a locked state (blocking state) and a buffered state (throttle state).

The link mechanism 6 includes a first link 6A, a second link 6B, a third link 6C, a fourth link 6D, and a caster spring (spring) 18.
One end of the fourth link 6D is attached to the vehicle body frame 7 via the first bracket B. The other end of the fourth link 6D is attached to the caster unit.
The drive unit 1 and the fourth link 6D are connected via a first link 6A, a third link 6C, a second link 6B, and a caster spring 18.
The caster spring 18 is provided between the third link 6C and the fourth link 6D.

The upper end portion of the cylinder device 11 is attached to the support body 10 (support cylinder 10A and connecting member 10B) provided on the upper end of the other end portion of the fourth link 6D. A lower end portion of the cylinder device 11 is attached to the vehicle body frame 7 via a third bracket 12.
The cylinder device 11 includes an opening / closing part (a hole part 11F and a ball 11G that can be enclosed in the hole part 11F). The open / close section can block or conduct the hydraulic oil passage of the cylinder, similarly to the above open / close valve.

  According to this suspension device, when the forklift with the caster wheel 3 in contact with the ground turns suddenly to the left, the opening / closing part closes and the oil passage is shut off, and the cylinder device 11 is locked and the support 10 is moved. Therefore, even if the caster spring 18 between the third link 6C and the fourth link 6D is bent, the left front wheel can be prevented from being lifted.

  However, in this suspension device, in order to prevent the left front wheel from floating, it is necessary to attach the support 10 and the like (including the upper end portion of the cylinder device 11) to the upper portion on the other end portion side of the fourth link 6D. The driver's seat formed by the vehicle body frame 7 is located directly above the caster wheel 3, the support body 10, and the cylinder device 11, so that the support body 10 between the vehicle body frame 7 and the other end of the fourth link 6D, etc. There is a problem that the position of the floor (bottom surface) of the driver's seat becomes higher by the amount of the installation space, which causes inconvenience in getting on and off the forklift.

JP-A-6-191251 Japanese Utility Model Publication No. 64-39116

  SUMMARY OF THE INVENTION An object of the present invention is to provide a suspension device for a forklift that can prevent the front wheel on the left side of the vehicle body from floating during a sudden left turn and can lower the position of the driver's seat.

  In order to solve the above-described problems, the present invention provides a drive unit including a drive wheel, a caster unit including a caster wheel, a vehicle body frame, and the drive unit and the caster unit that can swing up and down with respect to the vehicle body frame. A suspension device for a forklift comprising a suspension link mechanism and a cylinder device that is provided between the link mechanism and the vehicle body frame and can be in a locked state and a buffer state. An upper link attached to the drive unit and having the other end attached to the vehicle body frame, a caster link having one end disposed below the upper link and the other end attached to the caster unit, and the caster An underlink that supports the link so that it can swing up and down. The cylinder device is provided between the other end portion of the upper link attached to the body frame and one end portion of the caster link, or the body frame to which the other end portion of the upper link is attached. A forklift suspension device is provided between one end portion of the caster link.

  In the above configuration, the cylinder device enters the locked state when the forklift makes a left turn at a predetermined turning acceleration or higher, or when the fork lift has a predetermined height or higher, while the forklift has a predetermined turning acceleration. It is preferable to enter the buffer state when turning counterclockwise at less than or when the height of the fork is less than a predetermined height.

In the present invention, the cylinder device that can be in the locked state and the buffered state is disposed at the other end portion of the upper link attached to the vehicle body frame and below the upper link, and can swing up and down by the under link. It is provided between one end portion of the supported caster link or between a vehicle body frame to which the other end portion of the upper link is attached and one end portion of the caster link.
For this reason, the cylinder device in the locked state prevents the caster link from swinging up and down with respect to the vehicle body frame, so that the left front wheel is prevented from floating during sudden left turn, and the cylinder device is connected to the caster unit. The distance between the upper part of the other end of the caster link and the driver's seat formed by the vehicle body frame can be sufficiently reduced. Can be lowered.
In other words, according to the present invention, it is possible to provide a suspension device for a forklift that can prevent the front wheel on the left side of the vehicle body from floating during a sudden left turn and can lower the position of the driver's seat.

It is a perspective view of a reach type forklift. It is a perspective view of the forklift suspension device according to the present invention. It is a side view of the suspension apparatus of FIG. (A) is the upper perspective view of the caster link of the suspension apparatus of FIG. 2, (B) is the lower perspective view of (A). (A) is an upper perspective view of the under link of the suspension device of FIG. 2, and (B) is a lower perspective view of (A).

  Hereinafter, as a preferred embodiment of the present invention, a description will be given of a reach type forklift rear wheel suspension system in which a drive wheel and a caster wheel are provided at a rear portion of a vehicle body with reference to the drawings.

  As shown in FIG. 1, the forklift 1 stands on the vehicle body 2, a pair of left and right straddle legs 3 provided at the front of the vehicle body 2, and movable in the front-rear direction along each straddle leg 3. A mast 4 provided, a pair of forks 5 fixed to the front part of a bracket supported so as to be movable up and down along the mast 4, and a front wheel (road wheel) provided at a position below the front part of each straddle leg 3 ) 6, a driver's seat 7 provided to be opened rearward at the right rear portion of the vehicle body 2, and various types for operating the mast 4, fork 5, etc. An operation lever 8, a steering handle 9 for steering provided above the left side wall 7 b of the driver's seat 7, a suspension device 10 (see FIGS. 2 and 3) provided inside the vehicle body 2, It is provided at the lower left position of the rear part of the vehicle body 2, A drive wheel (drive wheel) 21 for moving the body 2 and a pair of caster wheels (rotated in the moving direction of the vehicle body 2) provided in the lower right position of the rear portion of the vehicle body 2 (below the floor portion 7a of the driver's seat 7) Auxiliary wheel) 31.

As shown in FIGS. 2 and 3, the suspension device 10 includes a vehicle body frame 70 that forms the driver's seat 7, a drive unit 20, a caster unit 30, and the drive unit 20 and the caster unit 30 with respect to the vehicle body frame 70. A link mechanism 40 suspended vertically so as to be swingable, a cylinder device 50, and an elastic member 60 are provided.
As shown in FIGS. 1 and 3, the vehicle body frame 70 includes a horizontal frame portion 70a and a vertical frame portion 70b that respectively form a floor portion (floor surface) 7a and a side wall portion (inner surface) 7b of the driver's seat 7. Yes.

  Further, the forklift 1 is connected to an urging means 80 for urging the drive unit 20 downward, a traveling motor 91, a torque detection unit (not shown) attached to the lower portion of the steering handle 9, and the torque detection unit. The electric power steering (EPS) motor 92 is further provided.

The drive unit 20 (drive wheel 21) is disposed in a side space of the driver's seat 7 (a space on the left side of the vertical frame portion 70b).
The drive unit 20 includes a drive wheel 21, a gear case 22 that supports the drive wheel 21 in a turnable manner, a drive support 23, and a turning gear portion 24.

The caster unit 30 (caster wheel 31) is disposed in a space below the driver's seat 7 (space below the horizontal frame portion 70a).
The caster unit 30 includes a pair of caster wheels 31 and a vertical shaft 32 that turns each caster wheel 31 in the horizontal direction.

  The link mechanism 40 includes a pair of upper links 41, caster links 42, and underlinks 43.

Each upper link 41 is arranged in a substantially horizontal (left-right) direction from the drive support 23 toward the vertical frame portion 70 b of the vehicle body frame 70.
One end 41 a of each upper link 41 is attached to the drive support 23 of the drive unit 20 via a fixing pin 44. The other end portion 41 b of each upper link 41 is attached to the vehicle body frame 70 (vertical frame portion 70 b) via a fixing pin 45.

The caster link 42 is disposed below the upper link 41.
One end portion 42 a of the caster link 42 is disposed above one end portion 43 a of the under link 43 in the side space of the driver's seat 7 and below the other end portion 41 b of the upper link 41. The other end 42 b of the caster link 42 is attached to the caster unit 30 (vertical shaft 32) in the space below the driver's seat 7.
The caster link 42 is fixed to the vehicle body frame 70 via a rotation pin 48.

  Further, as shown in FIGS. 4A and 4B, the caster link 42 is disposed substantially in parallel below the horizontal frame portion 70a of the vehicle body frame 70 and extends in the left-right direction, and the main body portion 42c. 42d that is erected in the substantially vertical direction on the left side (one end 42a side), a pin bearing portion 42e that is provided on the upper portion of the erected portion 42d in two front and rear portions, and each pin bearing portion It includes a flange portion 42f provided so as to extend from the lower portion of 42e toward the drive support 23, and two projecting portions 42g provided so as to extend vertically on the lower surface of the flange portion 42f.

A through-hole 42 i is provided in the front-rear direction in the middle part of the main body part 42 c of the caster link 42. A rotation pin 48 serving as a support shaft is inserted into the through hole 42i. Further, a through hole 42j is provided in the vertical direction in a portion of the main body 42c near the other end 42b. The vertical shaft 32 of the caster wheel 31 is inserted into the through hole 42j.
Each pin bearing portion 42e is provided with a through hole 42h in the front-rear direction. A rotation pin 46 is inserted in each through hole 42h.
The flange portion 42f is provided on the standing portion 42d so as to be inclined from the horizontal direction so that the angle formed by the left side surface of the standing portion 42d and the lower surface of the flange portion 42f becomes an obtuse angle.
Each protruding portion 42g is disposed in front of and behind the lower surface (inclined surface) of the flange portion 42f, and protrudes obliquely downward from the lower surface of the flange portion 42f.

The under link 43 is disposed below the upper link 41 and overlaps the main body portion 42c of the caster link 42 in a substantially horizontal direction (however, the standing portion 42d of the caster link 42, the pin bearing portion 42e, the flange portion 42f, and the The protrusions 42g are arranged so as not to overlap in the substantially horizontal direction.
One end portion 43 a of the under link 43 is disposed in a side space of the driver's seat 7 and is disposed below the other end portion 41 b of the upper link 41. The other end 43 b of the under link 43 is disposed closer to the one end 42 a (on the left side) than the other end 42 b of the caster link 42 in the space below the driver's seat 7.

  Further, as shown in FIGS. 5A and 5B, the under link 43 is disposed substantially in parallel below the horizontal frame portion 70a of the vehicle body frame 70, and has a main body portion 43c extending in the left-right direction, and a main body portion 43c. And a pair of pin bearing portions 43e provided on the left side of the main body portion 43c so as to sandwich the flange portion 43f therebetween. The under link 43 has a substantially square shape having an opening formed by one end portion 43a (the flange portion 43f and the pin bearing portion 43e), the other end portion 43b, and the main body portion 43c. The main body part 42c of the caster link 42 is inserted into the opening.

Each through hole 43 i corresponding to (overlapping with) the through hole 42 i of the caster link 42 is provided in the front-rear direction at an intermediate portion of the main body 43 c of the under link 43. A rotation pin 48 is inserted into each through-hole 43i in the same manner as each through-hole 42i. Further, the other end 43b of the under link 43 (main body part 43c) is arranged so as to straddle the upper part of the main body part 42c of the caster link 42. However, the other end part 42b (through hole 42j) of the caster link 42 is provided. It is not placed at the top. That is, no member is disposed between the other end portion 42 b of the caster link 42 and the horizontal frame portion 70 a of the vehicle body frame 70.
Each pin bearing portion 43e is provided with a through hole 43h in the front-rear direction. A fixing pin 47 is inserted into the through hole 43h.
The upper surface (inclined surface) 43g of the flange portion 43f faces the projecting portion 42g (the lower surface of the flange portion 42f) of the caster link 42 and is substantially perpendicular to the projecting direction of the projecting portion 42g (the flange portion 42f). Inclined from the horizontal direction so that it is substantially parallel to the lower surface. The flange portion 43f is provided with through holes 43d corresponding to (overlapping) the through holes 43h in the front-rear direction. A fixing pin 47 is inserted into each through-hole 43d in the same manner as each through-hole 43h.

The cylinder device 50 includes an arbitrary lock cylinder that can be in a locked state and a buffered state by opening and closing an opening / closing part (not shown) such as an opening / closing valve. The cylinder device 50 is disposed between the upper link 41 and the caster link 42 attached to the vehicle body frame 70 (vertical frame portion 70b). The cylinder device 50 may be disposed between the vehicle body frame 70 (the vertical frame portion 70b) to which the upper link 41 is attached and the caster link 42.
As shown in FIGS. 2 and 3, the upper end portion of the cylinder device 50 is attached to the other end portion 41 b of the upper link 41 via a fixing pin 45 between the upper links 41. Note that the upper end portion of the cylinder device 50 may be attached to the other end portion 41 b of the upper link 41 (the vertical frame portion 70 b of the vehicle body frame 70) via another pin different from the fixing pin 45. The lower end portion of the cylinder device 50 is attached to one end portion 42a of the caster link 42 via a rotation pin 46 between the two pin bearing portions 42e.

The elastic member 60 is disposed between the caster link 42 and the underlink 43. In addition, the elastic member 60 includes two caster springs 60 in this embodiment. One or three or more caster springs 60 may be used.
The upper end portion of each caster spring 60 is attached to each end portion 42a of the caster link 42 (more specifically, each protrusion 42g on the lower surface of the flange portion 42f). The lower end portion of each caster spring 60 is attached to one end portion 43a of the under link 43 (more specifically, the upper surface 43g of the flange portion 43f).
The caster spring 60 rotates with one of the caster link 42 (flange portion 42f) and the under link 43 (flange portion 43f) away from the other (more specifically, with the rotation pin 48 as a support shaft). The caster link 42 biases the caster wheel 31 in an oblique direction (pressing the caster wheel 31 against the ground). For this reason, the caster link 42 is supported by the under link 43 so as to be swingable up and down via the caster spring 60.
Further, since the caster spring 60 is positioned by the two protruding portions 42g, it is possible to stably absorb vibrations in various directions of the caster wheel 31.

  The urging means 80 urges the drive support 23 of the drive unit 20 downward (so as to press the drive wheel 21 against the ground), and is composed of a spring in this embodiment. The biasing means 80 is not limited to a spring, and may be composed of other biasable elements such as a cylinder.

The traveling motor 91 is supported by the drive support 23 and drives the drive wheel 21 via the turning gear portion 24.
The torque detector detects the steering torque applied to the steering handle 9 and outputs a torque signal.
The EPS motor 92 is supported by the drive support 23 and is rotationally driven in accordance with a torque signal output from the torque detector to reduce steering torque.

  Next, the operation and effect of the cylinder device 50 of the suspension device 10 will be described.

  When the forklift 1 makes a sudden left turn with a predetermined turning acceleration or more, or when the fork 5 has a height higher than a predetermined height (when the fork 5 is in a lifted state), an illustration provided on the vehicle body 2 is shown. The cylinder device 50 is locked by a signal from a controller (such as an arbitrary acceleration sensor that detects the turning acceleration of the forklift 1 or an arbitrary height detection sensor that detects the height of the fork 5). The left sudden turn of the forklift 1 includes not only the case where the forward forklift 1 turns leftward but also the case where the backward forklift 1 turns rightward.

  Therefore, according to the suspension device 10, the cylinder device 50 in the locked state prevents the caster link 42 from swinging up and down with respect to the vehicle body frame 70. Therefore, the left front wheel (load) caused by the deflection of the caster spring 60 is prevented. The wheel 6 is prevented from floating. In particular, when the front wheel on the left side of the vehicle body 2 floats when the forklift 1 suddenly turns to the left, the cylinder device 50 is locked to prevent the left front wheel from floating, The anxiety of the operator is eliminated, and safe cargo handling work with the forklift 1 becomes possible. Moreover, since the forklift 1 is unlikely to fall down in the lateral direction at the time of high elevation, safety can be further ensured.

Note that when the forklift 1 turns left at a predetermined turning acceleration or higher, for example, when an acceleration sensor (not shown) provided on the vehicle body 2 detects an acceleration higher than the predetermined left turning acceleration, the steering handle 9 suddenly turns. This means when there is a left turn.
Also, when the height of the fork 5 is greater than or equal to a predetermined height, for example, the height detection sensor of the fork 5 provided on the vehicle body 2 is higher than a predetermined height (the risk that the forklift 1 may fall sideways). The time when a certain height) is detected.

  Moreover, in this suspension apparatus 10, when the forklift 1 turns left with less than a predetermined turning acceleration (when not suddenly turning left), or when the height of the fork 5 is less than a predetermined height (when it is not in an elevated state) In addition, the cylinder device 50 enters a buffered state by a signal from a controller (acceleration sensor, height detection sensor, etc.).

  Therefore, according to the suspension device 10, the cylinder device 50 in the buffered state allows the caster link 42 to swing up and down with respect to the vehicle body frame 70, so that the riding comfort of the forklift 1 can be ensured.

Further, in the suspension device 10, the cylinder device 50 is disposed by the other end portion 41 b of the upper link 41 attached to the vehicle body frame 70 (vertical frame portion 70 b) and the under link 43. A body frame 70 (vertical frame portion 70b) to which the other end portion 41b of the upper link 41 is attached, and one end of the caster link 42, between the one end portion 42a of the caster link 42 supported so as to be swingable up and down. It is provided between the part 42a. In other words, the cylinder device 50 is disposed in the space between the vertical frame portion 70b of the vehicle body frame 70 and the drive support 23, and is located above the other end portion 42b of the caster link 42 to which the caster unit 30 is attached. Not provided.
Therefore, according to the suspension device 10, since there is no extra member at the upper part of the other end part 42b of the caster link 42 as in the prior art, the upper part of the other end part 42b and the vehicle body frame 70 (the horizontal frame part 70a). ) Can be sufficiently reduced, and the position of the driver seat 7 can be lowered.

  As mentioned above, although preferable embodiment of this invention was described, the structure of this invention is not limited to these embodiment.

  For example, the shapes, sizes, and the like of the upper link 41, the caster link 42, and the under link 43 of the link mechanism 40 are not limited to the above embodiment, and may be changed as appropriate.

  The cylinder device 50 may have any configuration as long as the cylinder device 50 can be in a locked state and a buffered state by opening and closing an opening / closing part (such as an opening / closing valve).

  Further, the elastic member 60 is not limited to the caster spring 60, and may be composed of other elastically deformable members such as a rubber member.

DESCRIPTION OF SYMBOLS 1 Forklift 2 Car body 3 Straddle leg 4 Mast 5 Fork 6 Front wheel 7 Driver's seat 7a Floor part 7b Side wall part 8 Operation lever 9 Steering handle 10 Suspension device 20 Drive unit 21 Drive wheel 22 Gear case 23 Drive support 24 Turning gear part 30 Caster unit 31 Caster Wheel 32 Vertical shaft 40 Link mechanism 41 Upper link 41a One end portion 41b Other end portion 42 Caster link 42a One end portion 42b Other end portion 42c Main body portion 42d Standing portion 42e Pin bearing portion 42f Flange portion 42g Protruding portions 42h, 42i, 42j Through Hole 43 Under link 43a One end portion 43b Other end portion 43c Main body portions 43d, 43h, 43i Through hole 43e Pin bearing portion 43f Flange portion 43g Upper surface 44, 45, 47 Fixed pin 46 Rotating pin 48 Support shaft (rotating pin)
50 Cylinder device 60 Elastic member 70 Body frame 70a Horizontal frame portion 70b Vertical frame portion 80 Energizing means 91 Motor 92 Traveling motor EPS motor

Claims (2)

A drive unit including a drive wheel; a caster unit including a caster wheel; a vehicle body frame; a link mechanism for swinging the drive unit and the caster unit up and down with respect to the vehicle body frame; the link mechanism; In the forklift suspension device provided with the cylinder device that is provided between the vehicle body frame and can be in a locked state and a buffered state,
The link mechanism is
An upper link having one end attached to the drive unit and the other end attached to the body frame;
A caster link having one end disposed below the upper link and the other end attached to the caster unit;
An under link that supports the caster link so as to be swingable up and down,
The cylinder device is
Between the other end portion of the upper link attached to the vehicle body frame and one end portion of the caster link, or between the vehicle body frame attached to the other end portion of the upper link and one end portion of the caster link. A suspension device for a forklift characterized by being provided in between.   The cylinder device enters the locked state when the forklift turns left at a predetermined turning acceleration or higher, or when the fork height is higher than a predetermined height, while the forklift turns left at a predetermined turning acceleration lower than the predetermined turning acceleration. 2. The suspension device according to claim 1, wherein the suspension state is established when the fork is less than a predetermined height.

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