Brake actuating assembly for a vehicle
A brake actuating assembly for use in a vehicle includes a clutch assembly that includes a pinion provided on one of a lever and a mounting bracket of the actuating assembly. The pinion includes a shaft and a plurality of teeth that interact with an arcuate rack of teeth provided on the other of the lever and the mounting bracket. The clutch assembly also includes a torsion clutch spring that includes a plurality of coils wrapped around the shaft of the pinion, a fixed end at one end of the coils, and a free end at an opposite end of the coils. At least one of the shaft of the pinion and the spring is tapered in an axial direction thereof such that an interference fit between the spring and the shaft is lower near the free end of the spring than near the fixed end of the spring.
1. A brake actuating assembly for use in a vehicle having a brake system, the brake actuating assembly comprising:
a mounting bracket for mounting the brake actuating assembly to the vehicle;
a lever mounted to the mounting bracket for pivotal movement about a pivot axis in a brake applying direction and in a brake releasing direction, the lever being configured to be engaged and moved by a person in at least the brake applying direction,
the lever being connectable to the brake system of the vehicle such that movement of the lever in the brake applying direction activates the brake system and movement of the lever in the brake releasing direction de-activates the brake system;
an arcuate rack of teeth provided on one of the lever and the mounting bracket;
a clutch assembly constructed and arranged to interact with the arcuate rack of teeth, the clutch assembly comprising
a pinion provided on the other of the lever and the mounting bracket, the pinion comprising a shaft and a plurality of teeth disposed circumferentially around the shaft,
the plurality of teeth engaging the arcuate rack of teeth; and
a torsion clutch spring comprising a plurality of coils, a fixed end at one end of the coils, and a free end at an opposite end of the coils, the coils being wrapped around the shaft of the pinion, the fixed end being connected to said other of the lever and the mounting bracket,
the torsion clutch spring normally being in a contracted position frictionally engaging the shaft of the pinion in an interference fit, the torsion clutch spring in the contracted position being arranged to (a) allow the pinion to rotate in a first rotational direction caused by movement of the lever in the brake applying direction, and (b) prevent rotation of the pinion in a second rotational direction opposite the first rotational direction to thereby prevent movement of the lever in the brake releasing direction;
the free end of the torsion clutch spring being movable to move the torsion clutch spring to an expanded position allowing the pinion to rotate in both the first and second rotational directions, thereby allowing the lever to move in both the brake applying and releasing directions; and
wherein at least one of the shaft of the pinion and the torsion clutch spring is tapered in an axial direction thereof such that the interference fit between the torsion clutch spring and the shaft is lower near the free end of the torsion clutch spring than near the fixed end of the torsion clutch spring.
2. A brake actuating assembly according to claim 1 , wherein the lever is a pedal arm having a pedal pad on a distal end thereof away from the pivot axis, the pedal pad being configured to be engaged by the person's foot.
3. A brake actuating assembly according to claim 1 , further comprising a pusher movably mounted to the mounting bracket, the pusher being constructed and arranged to engage the free end of the torsion clutch spring and move the free end of the torsion clutch spring in a direction that causes the coils to uncoil, which allows the pinion to rotate in the second direction, thereby allowing the lever to move in the brake releasing direction.
4. A brake actuating assembly according to claim 3 , further comprising a brake release operatively connected to the pusher so as to affect movement of the pusher when the brake release is actuated.
5. A brake actuating assembly according to claim 4 , wherein the brake release comprises a handle and a cable connected to the handle and the pusher.
6. A brake actuating assembly according to claim 1 , wherein the shaft of the pinion is tapered in the axial direction at a taper angle.
7. A brake actuating assembly according to claim 6 , wherein the taper angle is between about 0.5 ° and about 2.0°.
8. A brake actuating assembly according to claim 7 , wherein the taper angle is between about 0.8 ° and about 1.5°.
9. A brake actuating assembly according to claim 1 , wherein the torsion clutch spring is tapered in the axial direction at a taper angle.
10. A clutch assembly for a brake actuating assembly for use in a vehicle having a brake system, the brake actuating assembly comprising a mounting bracket and a lever mounted to the mounting bracket for pivotal movement about a pivot axis in a brake applying direction and a brake releasing direction, the lever being configured to be engaged and moved by a person in at least the brake applying direction, and being connectable to the brake system of the vehicle such that movement of the lever in a brake applying direction activates the brake system and movement of the lever in a brake releasing direction de-activates the brake system, the clutch assembly comprising:
a pinion constructed and arranged to be provided on at least one of the lever and the mounting bracket, the pinion comprising a shaft and a plurality of teeth disposed circumferentially around the shaft, the plurality of teeth being configured to engage an arcuate rack of teeth provided on the other of the lever and the mounting bracket; and
a torsion clutch spring comprising a plurality of coils, a fixed end at one end of the coils, and a free end at an opposite end of the coils, the coils being wrapped around the shaft of the pinion, the fixed end being connectable to said other of the lever and the mounting bracket,
the torsion clutch spring normally being in a contracted position frictionally engaging the shaft of the pinion in an interference fit, the torsion clutch spring in the contracted position being arranged to (a) allow the pinion to rotate in a first rotational direction caused by movement of the lever in the brake applying direction, and (b) prevent rotation of the pinion in a second rotational direction opposite to the first rotational direction to thereby prevent movement of the lever in the brake releasing direction;
the free end of the torsion clutch spring being movable to move the torsion clutch spring to an expanded position allowing the pinion to rotate in both the first and second rotational directions, thereby allowing the lever to move in both the brake applying and releasing directions; and
wherein at least one of the shaft of the pinion and torsion clutch spring is tapered in an axial direction thereof such that the interference fit between the torsion clutch spring and the shaft is lower near the free end of the torsion clutch spring than near the fixed end of the torsion clutch spring.
11. A clutch assembly according to claim 10 , wherein the shaft of the pinion is tapered in the axial direction at a taper angle.
12. A clutch assembly according to claim 11 , wherein the taper angle is between about 0.5° and about 2.0°.
13. A clutch assembly according to claim 12 , wherein the taper angle is between about 0.8° and about 1.5°.
14. A clutch assembly according to claim 10 , wherein the torsion clutch spring is tapered in the axial direction at a taper angle.
15. A vehicle with a brake system and a brake actuating assembly, the brake actuating assembly comprising:
a mounting bracket for mounting the brake actuating assembly to the vehicle;
a lever mounted to the mounting bracket for pivotal movement about a pivot axis in a brake applying direction and in a brake releasing direction, the lever being configured to be engaged and moved by a person in at least the brake applying direction,
the lever being connectable to the brake system of the vehicle such that movement of the lever in the brake applying direction activates the brake system and movement of the lever in the brake releasing direction de-activates the brake system;
an arcuate rack of teeth provided on one of the lever and the mounting bracket;
a clutch assembly constructed and arranged to interact with the arcuate rack of teeth, the clutch assembly comprising
a pinion provided on the other of the lever and the mounting bracket, the pinion comprising a shaft and a plurality of teeth disposed circumferentially around the shaft,
the plurality of teeth engaging the arcuate rack of teeth; and
a torsion clutch spring comprising a plurality of coils, a fixed end at one end of the coils, and a free end at an opposite end of the coils, the coils being wrapped around the shaft of the pinion, the fixed end being connected to said other of the lever and the mounting bracket,
the torsion clutch spring normally being in a contracted position frictionally engaging the shaft of the pinion in an interference fit, the torsion clutch spring in the contracted position being arranged to (a) allow the pinion to rotate in a first rotational direction caused by movement of the lever in the brake applying direction, and (b) prevent rotation of the pinion in a second rotational direction opposite the first rotational direction to thereby prevent movement of the lever in the brake releasing direction;
the free end of the torsion clutch spring being movable to move the torsion clutch spring to an expanded position allowing the pinion to rotate in both the first and second rotational directions, thereby allowing the lever to move in both the brake applying and releasing directions; and
wherein at least one of the shaft of the pinion and the torsion clutch spring is tapered in an axial direction thereof such that the interference fit between the torsion clutch spring and the shaft is lower near the free end of the torsion clutch spring than near the fixed end of the torsion clutch spring.
16. A vehicle according to claim 15 , wherein the lever is a pedal arm having pedal pad on a distal end thereof away from the pivot axis, the pedal pad being configured to be engaged by the person's foot.
17. A vehicle according to claim 15 , further comprising a pusher movably mounted to the mounting bracket, the pusher being constructed and arranged to engage the free end of the torsion clutch spring and move the free end of the torsion clutch spring in a direction that causes the coils to uncoil, which allows the pinion to rotate in the second direction, thereby allowing the lever to move in the brake releasing direction.
18. A vehicle according to claim 17 , further comprising a brake release operatively connected to the pusher so as to affect movement of the pusher when the brake release is actuated.
19. A vehicle according to claim 18 , wherein the brake release comprises a handle and a cable connected to the handle and the pusher.
20. A vehicle according to claim 15 , wherein the shaft of the pinion is tapered in the axial direction at a taper angle.
21. A vehicle according to claim 20 , wherein the taper angle is between about 0.5° and about 2.0°.
22. A vehicle according to claim 21 , wherein the taper angle is between about 0.8° and about 1.5°.
23. A vehicle according to claim 15 , wherein the torsion clutch spring is tapered in the axial direction at a taper angle.