Installation structure for pedal stroke sensor
Disclosed herein is an installation structure for a pedal stroke sensor, including: a piston configured to move forward and backward by an operation of a pedal; a mounting member disposed on the piston; a first shaft coupled with the mounting member; a second shaft including a second gear engaged with a first gear of the first shaft; and a measuring portion disposed on the second shaft.
1. An installation structure for a pedal stroke sensor, comprising:
a first shaft extending in parallel to a movement direction of a piston moving by an operation of a brake pedal, the first shaft including a rack gear;
a second shaft including a measuring portion for sensing a rotation to detect a displacement of the brake pedal at one end, extending in a direction that is vertical to the first shaft, and including a pinion gear engaged with the rack gear; and
a mounting member configured to couple a piston with the first shaft.
2. The installation structure for the pedal stroke sensor according to claim 1 , further comprising an engagement maintenance portion disposed around the second shaft and configured to reduce a space between the rack gear and the pinion gear.
3. The installation structure for the pedal stroke sensor according to claim 2 , wherein the engagement maintenance portion includes a torsion spring whose one end is fixed and whose the other end is coupled with the pinion gear to maintain an engaged state of the pinion gear and the rack gear.
4. The installation structure for the pedal stroke sensor according to claim 3 , further comprising a support member which rotatably supports the second shaft, and on which one end of the torsion spring is fixed.
5. The installation structure for the pedal stroke sensor according to claim 1 , wherein the mounting member is connected to the first shaft using a fixing member, and
the fixing member is made of a rubber material.
6. The installation structure for the pedal stroke sensor according to claim 1 , wherein the mounting member comprises a coupling hole which is formed at one side of the mounting member in such a way to penetrate the mounting member and into which an outer circumferential surface of the piston is pressed along an inner circumferential surface of the mounting member, a coupling groove which is recessed at an outer side of the mounting member and into which an outer circumferential surface of the first shaft is pressed, and at least one coupling protrusion protruding from an inner circumferential surface of the coupling hole.
7. The installation structure for the pedal stroke sensor according to claim 6 , wherein the mounting member is manufactured by injection molding.
8. The installation structure for the pedal stroke sensor according to claim 7 , wherein the first shaft comprises a coupling portion rested in the inside of the coupling groove, and a pair of support protrusions protruding outward from both ends of the coupling portion and respectively supported on both surfaces of the mounting member.
9. The installation structure for the pedal stroke sensor according to claim 6 , wherein the mounting member further comprises a pair of resting protrusions protruding from the coupling groove and configured to prevent the first shaft rested in and coupled with the coupling groove from escaping from the coupling groove.
10. The installation structure for the pedal stroke sensor according to claim 1 , further comprising a pressing portion configured to press the first shaft toward the second shaft.
11. The installation structure for the pedal stroke sensor according to claim 10 , wherein the rack gear faces the second shaft,
the first shaft includes a concave portion formed in the opposite side of the rack gear, and
the pressing portion presses the concave portion to maintain an engaged state of the rack gear with the pinion gear.
12. The installation structure for the pedal stroke sensor according to claim 11 , wherein the pressing portion comprises:
a housing;
a pressing globe configured to roll and move along a guide surface formed in the housing; and
an elastic member configured to provide an elastic force to the pressing globe outwardly in the housing,
wherein a radius of an arc forming the concave portion is larger than a radius of the pressing globe so that the pressing globe presses the concave portion to restrict left and right movements of the first shaft.
13. The installation structure for the pedal stroke sensor according to claim 12 , wherein a top end of the pressing portion is fixed, and the pressing globe protrudes from a lower end of the pressing portion to press the concave portion.