Vehicle suspension linkage
Disclosed herein is a two-wheel vehicle suspension linkage. The suspension linkage includes a suspended body- 1 , a seatstay body- 2 , a link body- 3 , a chainstay body- 4 , a link body- 5 , and a link body- 6 operatively coupled with one another. The link body- 3 includes jointed connections with the suspended body- 1 defining an IVC[ 1][3 ], the chainstay body- 4 defining an IVC[ 3][4 ], and the link body- 6 defining an IVC[ 3][6 ]. The chainstay body- 4 includes an additional jointed connection with the seatstay body- 2 defining an IVC[ 2][4 ]. The link body- 5 includes additional jointed connections with suspended body- 1 defining an IVC[ 1][5 ], seatstay body- 2 defining an IVC[ 2][5 ], and the link body- 6 defining an IVC[ 5][6 ]. A lower base line is defined by IVC[ 1][3 ] and IVC[ 3][4 ]. An upper base line is defined by IVC[ 1][5 ] and IVC[ 2][5 ]. The IVC[ 5][6 ] is located outside the upper and lower base lines. The suspension linkage includes a damper unit configured to resist movement between two or more of the suspended body- 1 , seatstay body- 2 , link body- 3 , chainstay body- 4 , link body- 5 , or link body- 6.
1 . A suspension linkage for two wheeled vehicles comprising:
a plurality of linkage bodies including:
a suspended body, a wheel carrier body, a third body, a fourth body, a fifth body, and a sixth body operatively coupled, wherein:
the fourth body is a chainstay body that includes a jointed connection to the wheel carrier body, and is pivotally connected at a concentric pivot to two others of the plurality of linkage bodies; and
a shock assembly configured to resist movement between the suspended body and at least one of the wheel carrier body, the third body, the fourth body, the fifth body, or the sixth body, wherein:
as the shock assembly moves in one direction between an extended state and a compressed state, a migration path of an instantaneous velocity center (IVC) of the concentric pivot reverses at an inflection point and a migration path of an IVC formed between the suspended body and the fourth body intersects the migration path of the IVC of the concentric pivot at the inflection point.
2 . The suspension linkage of claim 1 , wherein the fourth body is pivotally connected concentrically to the third body and the sixth body at the concentric pivot.
3 . The suspension linkage of claim 1 , wherein the wheel carrier body is a brake carrier body.
4 . The suspension linkage of claim 1 , wherein:
the third body ( 121 ) includes:
a jointed connection with the suspended body ( 119 ) defining an instantaneous velocity center (IVC) IVC[ 119 ][ 121 ] ( 126 ),
a jointed connection with the fourth body ( 122 ) defining an IVC[ 121 ][ 122 ] ( 130 );
the fourth body ( 122 ) includes:
a jointed connection with the wheel carrier body ( 120 ) defining an IVC[ 120 ][ 122 ] ( 128 );
the fifth body includes:
a jointed connection with the suspended body ( 119 ) defining an IVC[ 119 ][ 123 ] ( 127 ),
a jointed connection with the wheel carrier body defining an IVC[ 120 ][ 123 ] ( 129 ), and
a jointed connection with the sixth body defining an IVC[ 123 ][ 124 ] ( 131 ).
5 . The suspension linkage of claim 4 , wherein the wheel carrier body is a brake carrier body.
6 . The suspension linkage of claim 1 , wherein the jointed connection of the fourth body and the wheel carrier body is at a first end portion of the fourth body, and the concentric pivot is at a second end portion of the fourth body opposite the first end portion.
7 . A suspension linkage for two wheeled vehicles comprising:
a plurality of operably coupled link bodies including a suspended body, a chainstay body, and a seatstay body, wherein the chainstay body includes a concentric pivot connection with at least two others of the plurality of link bodies, and wherein the chainstay body includes a jointed connection to the seatstay body; and
a shock assembly configured to resist a relative movement between the suspended body, and the chainstay body, wherein:
as the suspension linkage moves in one direction from an at least partially extended state to an at least partially compressed state, an axis at the concentric pivot connection follows a migration path that reverses at an inflection point and a migration path of an instantaneous velocity center formed between the suspended body and the chainstay body intersects the migration path of the axis of the concentric pivot at the inflection point.
8 . The suspension linkage of claim 7 , wherein the plurality of link bodies further includes a third link body and a fifth link body.
9 . The suspension linkage of claim 8 , wherein the plurality of link bodies further includes a sixth link body.
10 . The suspension linkage of claim 9 , wherein the shock assembly is pivotally connected between any two of the third link body, the fifth link body, the sixth link body, and the suspended body.
11 . The suspension linkage of claim 8 , wherein the shock assembly is pivotally connected between any two of the third link body, the fifth link body, and the suspended body.
12 . The suspension linkage of claim 7 , wherein:
the plurality of link bodies further includes a third link body, a fifth link body, and a sixth link body operatively coupled to one another and to the suspended body and the chainstay body.
13 . The suspension linkage of claim 12 , wherein the chainstay body is pivotally connected concentrically to the third link body and the sixth link body at the concentric pivot.
14 . The suspension linkage of claim 12 , wherein the chainstay body is a wheel carrier body and the seatstay body is a brake carrier body.
15 . The suspension linkage of claim 12 , wherein, an instantaneous velocity center (IVC) is defined at the axis.
16 . The suspension linkage of claim 12 , wherein the jointed connection between the chainstay body and the seatstay body is at a first end portion of the chainstay body, and the pivotal connection between the chainstay body and the two other bodies is at a second end portion of the chainstay body opposite the first end portion.
17 . A suspension linkage for two wheeled vehicles comprising:
a plurality of linkage bodies including:
a suspended body, a second body, a third body, a fourth body, a fifth body, and a sixth body operatively coupled to form a plurality of instantaneous velocity centers (IVCs), wherein:
the suspended body defines an IVC[ 119 ][ 122 ] with the fourth body and the suspended body includes:
a jointed connection with the third body defining an IVC[ 119 ][ 121 ],
a jointed connection with the fifth body defining an IVC[ 119 ][ 123 ];
the second body defines an IVC[ 120 ][ 124 ] with the sixth body, the second body is a seat-stay, and the second body includes:
a jointed connection with the fourth body defining an IVC[ 120 ][ 122 ], wherein the fourth body is a chain-stay,
a jointed connection with the fifth body defining an IVC[ 120 ][ 123 ],
the third body defines an IVC[ 121 ][ 124 ] with the sixth body and the third body includes:
a jointed connection with the fourth body defining an IVC[ 121 ][ 122 ],
the fourth body defines an IVC[ 122 ][ 124 ] with the sixth body; and
the fifth body includes a jointed connection with the sixth body defining an IVC[ 123 ][ 124 ], wherein at least one of the IVC[ 119 ][ 122 ], the IVC[ 120 ][ 124 ], the IVC[ 121 ][ 124 ], or the IVC[ 122 ][ 124 ] is a hidden IVC
the IVC[ 121 ][ 122 ], the IVC[ 121 ][ 124 ], and the IVC[ 122 ][ 124 ] define respective migration paths that reverse at respective inflection points as the suspension linkage moves in a single direction between an extended state and a compressed state and a migration path of the IVC[ 119 ][ 122 ] intersects the respective migration paths of the IVC[ 121 ][ 122 ], the IVC[ 121 ][ 124 ], and the IVC[ 122 ][ 124 ] at the respective inflection points.
18 . The suspension linkage of claim 17 , wherein:
the third body ( 121 ) includes:
a jointed connection with the suspended body ( 119 ) defining an IVC[ 119 ][ 121 ]-( 126 ),
a jointed connection with the fourth body ( 122 ) defining an IVC[ 121 ][ 122 ] ( 130 ), and
a jointed connection with the sixth body ( 124 ) defining an IVC[ 121 ][ 124 ] ( 130 );
the fourth body ( 122 ) includes:
a jointed connection with a brake carrier body ( 120 ) defining an IVC[ 119 ][ 122 ] ( 128 ), and
a jointed connection with the sixth body ( 124 ) defining an IVC[ 122 ][ 124 ] ( 130 );
the fifth body ( 123 ) includes:
a jointed connection with the suspended body ( 119 ) defining an IVC[ 119 ][ 123 ] ( 127 ),
a jointed connection with the brake carrier body ( 120 ) defining an IVC[ 120 ][ 123 ] ( 129 ), and
a jointed connection with the sixth body ( 124 ) defining an IVC[ 123 ][ 124 ] ( 131 ), wherein the IVC[ 121 ][ 122 ] ( 130 ), the IVC[ 121 ][ 124 ] ( 130 ), and the IVC[ 122 ][ 124 ] ( 130 ) define an IVC group wherein each of the IVCs in the IVC group stays within about a distance of 5 mm to at least one other IVC in the IVC group as the suspension linkage moves between the-extended state and the compressed state.
19 . The suspension linkage of claim 18 , wherein the IVC[ 121 ][ 122 ], the IVC[ 121 ][ 124 ] and the IVC[ 122 ][ 124 ] are substantially the same IVC as one another as the suspension linkage moves between the extended state and the compressed state.
20 . The suspension linkage of claim 18 , wherein:
as the suspension linkage moves between the extended state and the compressed state there is relative motion between:
the third body ( 121 ) and the fourth body ( 122 ),
the third body ( 121 ) and the sixth body ( 124 ), and
the fourth body ( 122 ) and the sixth body ( 124 ).
21 . A suspension linkage for two wheeled vehicles comprising:
a plurality of linkage bodies including:
a suspended body, a wheel carrier body, a third body, a fourth body, a fifth body, and a sixth body operatively coupled defining at least eight primary instantaneous velocity centers, wherein:
at least three primary instantaneous velocity centers (IVCs) are defined at a concentric pivot; and
a shock assembly configured to resist movement between the suspended body and at least one of the wheel carrier body, the third body, the fourth body, the fifth body, or the sixth body, wherein:
as the shock assembly moves in one direction between an extended state and a compressed state, a migration path of at least one of the eight primary IVCs reverses at an inflection point and a migration path of an IVC formed between the suspended body and the wheel carrier body intersects the migration path of the at least one of the eight primary IVCs of the concentric pivot at the inflection point.