Suspension device

Patent metadata

Field	Value
Publication number	US-9688345-B2
Application number	US-201314384307-A
Country	US
Kind code	B2
Filing date	Mar 11, 2013
Priority date	Mar 21, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A suspension device includes a main body, and a stroke locking mechanism that locks expansion/contraction of the main body. The stroke locking mechanism includes: a tube member coupled to one of a vehicle body and a vehicle wheel; a partition wall body fixed inside the tube member so as to divide an interior of the tube member into a first chamber and a second chamber; a flow passage that connects the first chamber to the second chamber; a valve that cuts off the flow passage during stroke locking; and a shaft member coupled to the other of the vehicle body and the vehicle wheel and inserted into the first chamber to be capable of advancing and retreating. The first chamber is filled with a working fluid, and the working fluid is stored in the second chamber so as to form a reservoir portion.

First claim

The embodiments of this invention in which an exclusive property or privilege is claimed are defined as follows:

1. A suspension device having a suspension device main body interposed between a vehicle body and a vehicle wheel, and a stroke locking mechanism capable of locking expansion/contraction of the suspension device main body, the stroke locking mechanism comprising:
a tube member coupled to one of the vehicle body and the vehicle wheel;
a partition wall body fixed inside the tube member to divide an interior of the tube member into
a first chamber; and
a second chamber including a reservoir portion;

a flow passage that connects the first chamber to the second chamber;
a valve that is configured to cut off the flow passage during stroke locking;
a shaft member coupled to another of the vehicle body and the vehicle wheel and inserted into the first chamber to be capable of advancing and retreating; and
a piston held on a tip end of the shaft member to divide the first chamber into two chambers including a piston-side chamber and a shaft member-side chamber,
wherein the first chamber is filled with working fluid, and working fluid is stored in the reservoir portion of the second chamber,
wherein the flow passage includes
a first flow passage that connects the piston-side chamber to the reservoir portion of the second chamber; and
a second flow passage that connects the shaft member-side chamber to the reservoir portion of the second chamber, and

wherein when the stroke locking mechanism permits the expansion/contraction of the suspension device main body and the shaft member advances into the tube member, working fluid having a volume corresponding to a movement of the piston relative to the tube member flows from the piston side chamber into the reservoir portion through the first flow passage, and working fluid in the reservoir portion flows into the shaft member side chamber through the second flow passage,
when the stroke locking mechanism permits the expansion/contraction of the suspension device main body and the shaft member retreats from the tube member, working fluid having a volume corresponding to a movement of the piston relative to the tube member flows from the shaft member side chamber into the reservoir portion through the second flow passage, and working fluid in the reservoir portion flows into the piston side chamber through the first flow passage, and
when the stroke locking mechanism restricts the expansion/contraction of the suspension device main body, the valve cuts off the first flow passage and the second flow passage.

2. The suspension device as defined in claim 1 , wherein the stroke locking mechanism further comprises:
a cylinder that stands upright inside the tube member such that the piston slides against an inner peripheral surface thereof; and
a cylinder exterior passage formed between the cylinder and the tube member, the two chambers being formed inside the cylinder,
the first flow passage being constituted by an inner peripheral side connecting passage penetrating an axial center portion of the partition wall body, and
the second flow passage being constituted by an outer peripheral side connecting passage penetrating an outer peripheral portion of the partition wall body, the cylinder exterior passage, and a hole formed in the cylinder to connect the shaft member-side chamber to the cylinder exterior passage.

3. The suspension device as defined in claim 1 , wherein the tube member is coupled to the vehicle body, the shaft member is coupled to the vehicle wheel, and the stroke locking mechanism further comprises
an annular cap member blocking a vehicle body side opening of the tube member; and
an adjuster screwed to an inner periphery of the cap member, and the valve being held by a tip end of the adjuster.

4. The suspension device as defined in claim 3 , wherein the stroke locking mechanism further comprises:
a cylinder that stands upright inside the tube member such that the piston slides against an inner peripheral surface thereof; and
an annular rod guide that blocks a vehicle wheel side opening of the tube member, the shaft member penetrating the rod guide to be free to move in an axial direction, the cap member and the rod guide being screwed to inner peripheries of respective end portions of the tube member, and the cylinder and the partition wall body being sandwiched between the cap member and the rod guide.

5. The suspension device as defined in claim 1 , wherein
the valve always cuts off the second flow passage when the valve cuts off the first flow passage, and
the valve always cuts off the first flow passage when the valve cuts off the second flow passage.

6. The suspension device as defined in claim 1 , wherein
the valve always opens the second flow passage when the valve opens the first flow passage, and
the valve always opens the first flow passage when the valve opens the second flow passage.

7. The suspension device as defined in claim 1 , wherein when the stroke locking mechanism permits the expansion/contraction of the suspension device main body, and the piston moves relative to the tube member,
working fluid is communicated from the first flow passage to the second flow passage, or
working fluid is communicated from the second flow passage to the first flow passage.

Assignees

• Kyb Corp

Inventors

• Yoshimoto Tsutomu
• Shibuya Yu

Classifications

• B62K25/08 Primary

  for front wheel · CPC title

• B60G2204/46

  Means for locking the suspension · CPC title

• B60G3/01

  the wheel being mounted for sliding movement, e.g. in or on a vertical guide (camber maintaining means B60G3/26) · CPC title

• B60G17/005

  Suspension locking arrangements {(for retractable wheels B62D61/12)} · CPC title

• F16F9/56

  Means for adjusting the length of, or for locking, the spring or damper, e.g. at the end of the stroke {(F16F9/50 takes precedence; for telescopic gas springs or dampers F16F9/0245; vehicle suspension locking arrangements B60G17/005)} · CPC title