Pedal assembly
A brake pedal assembly for a motor vehicle includes a first link pivotally mounted on a bulkhead bracket, and a first pulley mounted for rotation on a vehicle cross member positioned rearward of the bulkhead. A brake pedal lever arm is pivotally mounted on either the firewall bracket or the cross member, while a cable passing over the pulley couples a lever arm defined on the first link with a cable attachment point on the brake pedal lever arm. In the event of a rearward displacement of the bulkhead during a collision, the flexible cable slackens to allow the pedal lever arm to move forward, away from the legs of the vehicle operator.
1 . A pedal assembly for an automotive vehicle, wherein the vehicle includes a bulkhead positioned generally forward of a seating position for a vehicle operator, and a rigid cross member spaced generally rearward of the bulkhead, the assembly comprising:
a link supported by the bulkhead for pivoting movement about a link pivot axis, the link including a first link lever arm;
a first pulley mounted on the cross member for rotation about a first pulley axis, wherein the first pulley axis is spaced from the link pivot axis;
an elongate pedal lever arm pivotally supported by one of the bulkhead and the cross member, the pedal lever arm having a free end extending to a position generally rearward of the bulkhead; and
a flexible cable having a first end attached to the first link lever arm, a second end attached to the pedal lever arm at a first distance from the pivot point, and an intermediate portion passing over the first pulley to thereby define a first section of the cable extending between the first link lever arm and the first pulley, and a second section of the cable extending between the first pulley and the pedal lever arm,
whereby a rearward displacement of the bulkhead relative to the cross member feeds the cable past the pulley, thereby lengthening the second section of the cable.
2 . The pedal assembly of claim 1 , wherein the pedal lever includes a cam surface, and wherein the second section of the cable passes over the cam surface.
3 . The pedal assembly of claim 2 , wherein the cam surface operates to increase a tensile force applied to the cable by the pedal lever arm with increasing forward displacement of the free end of the pedal lever arm.
4 . The pedal assembly of claim 2 , wherein the cam surface is defined by a selected one of a plurality of cams that Is secured to the pedal lever arm for rotation about the pivot point, each cam featuring a different cam profile.
5 . The pedal assembly of claim 1 , wherein the link includes a second link lever arm adapted to actuate a brake master cylinder.
6 . The pedal assembly of claim 1 , wherein the second link lever arm is positioned generally diametrically opposite from the first lever arm, relative to the link pivot axis.
7 . The pedal assembly of claim 1 , wherein the first pivot axis is generally parallel to the first pulley axis.
8 . The pedal assembly of claim 1 , including a second pulley supported by the bulkhead for rotation about a second pulley axis, and wherein the second cable section passes over the second pulley.
9 . A brake pedal assembly for actuating a master cylinder of an automotive vehicle, wherein the master cylinder includes a plunger, and wherein the vehicle includes a bulkhead positioned generally forward of a seating position for a vehicle operator, and a rigid cross member spaced generally rearward of the bulkhead, the pedal assembly comprising:
a link mounted on the bulkhead for pivoting movement about a first pivot axis, the link including a first link lever arm and a second lever arm, the second lever arm being coupled to the plunger of the master cylinder;
a first pulley mounted on the cross member for rotation about a first pulley axis, wherein the first pulley axis is spaced from the first link pivot axis;
a pedal lever arm including an elongate pedal lever arm pivotally supported by one of the bulkhead and the cross member, the pedal lever arm having a free end defining a pedal pad generally rearward of the bulkhead; and
a flexible cable having a first end coupled to the first link lever arm, a second end coupled to the pedal lever arm at a first distance from the pivot point, and an intermediate portion passing over the first pulley to thereby define a first section of the cable extending between the first link lever arm and the first pulley, and a second section of the cable extending between the first pulley and the pedal lever arm,
whereby a rearward displacement of the bulkhead relative to the cross member feeds the cable past the pulley, thereby lengthening the second cable section to allow the pedal pad to move generally forward, away from the seating position for the vehicle operator.
10 . The pedal assembly of claim 9 , wherein the pedal lever arm includes a cam surface, and the second section of the cable engages the cam surface.
11 . The pedal assembly of claim 10 , wherein the cam surface operates to increase a tensile force applied to the cable by the pedal lever arm with increasing forward displacement of the pedal pad.
12 . The pedal assembly of claim 11 , wherein the cam surface is defined by a selected one of a plurality of cams that Is secured to the pedal lever arm for rotation about the pivot point, each cam featuring a different cam profile.
13 . The pedal assembly of claim 9 , wherein the second link lever arm is positioned generally diametrically opposite from the first lever arm, relative to the link pivot axis.
14 . The pedal assembly of claim 9 , wherein the first pivot axis is generally parallel to the first pulley axis.
15 . The pedal assembly of claim 9 , including a second pulley mounted on the bulkhead for rotation about a second pulley axis, and wherein the second cable section passes over the second pulley.