Pedal travel simulator for a hydraulic vehicle power braking system
A stroke of a piston of a pedal travel simulator is limited via a spring ring that is inserted into a circumferential groove in a cylinder of the pedal travel simulator. The spring ring relieves the load on a cover of the pedal travel simulator that closes the cylinder of the pedal travel simulator.
1 . A pedal travel simulator for a hydraulic vehicle power braking system, the pedal travel simulator comprising:
a cylinder in which a piston is axially displaceably accommodated;
a cup-shaped cover that is situated in the cylinder, axially lengthening an interior holding region partly formed by the cylinder, and that closes an end face of the cylinder;
a first spring element that is situated in the interior holding region, at least partly within the cover, and that acts on the piston to move the piston into the cylinder;
a spring ring as a piston stop which is situated in a circumferential groove in the cylinder, between the piston and the end face of the cylinder, and which protrudes radially inwardly from the groove so that the spring ring limits a stroke of the piston in a direction towards the cover; and
a tubular and radially elastic fitting that holds the first spring element in the cover.
2 . The pedal travel simulator as recited in claim 1 , wherein the holding of the first spring element in the cover by the fitting is via an outward radial force exerted by the fitting against an interior of the cover.
3 . The pedal travel simulator as recited in claim 1 , wherein the fitting is arranged so that at least a portion of the fitting is arranged inside the cover.
4 . The pedal travel simulator as recited in claim 1 , wherein the cylinder, the cover, and the fitting are arranged so that a portion of the cover is arranged between a radial interior of the cylinder and a radial exterior of the fitting, and a portion of the fitting is arranged between a radial interior of the cover and a radial exterior of the first spring element.
5 . The pedal travel simulator as recited in claim 4 , wherein another portion of the fitting, which is located at an axial region in which the cover is not located, is arranged radially between the radial interior of the cylinder and the radial exterior of the first spring element.
6 . The pedal travel simulator as recited in claim 4 , wherein the holding of the first spring element in the cover by the fitting is via an outward radial force exerted by the fitting against the radial interior of the cover.
7 . The pedal travel simulator as recited in claim 1 , further comprising:
a force transmitter that is situated between the piston and the first spring element and that transmits an elastic force of the first spring element to the piston, wherein the fitting holds the force transmitter in or at the cover.
8 . The pedal travel simulator as recited in claim 7 , further comprising:
a second spring element, with the first spring element pressing against a first surface of the force transmitter that faces away from the piston and towards the cover and the second spring element arranged so that the second spring element applies a force against a second surface of the force transmitter that faces towards the piston and away from the cover, the second spring element thereby pressing the piston and the force transmitter apart.
9 . The pedal travel simulator as recited in claim 7 , wherein the force transmitter protrudes into the first spring element.
10 . The pedal travel simulator as recited in claim 1 , wherein the fitting is clampingly held in the cover.
11 . The pedal travel simulator as recited in claim 1 , wherein a support disk is situated in the cover on a side of the first spring element facing away from the piston, and transfers the elastic force of the first spring element close to a circumference to the cover.
12 . The pedal travel simulator as recited in claim 1 , wherein the first spring element (i) applies the force (a) in a first direction towards a face of the cover that faces the piston and (b) in a second direction opposite the first direction towards the face of the piston that faces the cover, and (ii) is formed as a disk spring packet that includes a plurality of spring disks that are stacked one against another in the first and second directions.
13 . A pedal travel simulator for a hydraulic vehicle power braking system, comprising:
a cylinder in which a piston is axially displaceably accommodated;
a cup-shaped cover that is situated in the cylinder, axially lengthening an interior holding region partly formed by the cylinder, and that closes an end face of the cylinder;
a first spring element that is situated in the interior holding region, at least partly within the cover, and that acts on the piston to move the piston into the cylinder; and
a radially elastic spring ring as a piston stop which is situated in a circumferential groove in the cylinder at a location that is axially spaced apart from the cup-shaped cover, between the piston and the end face of the cylinder, and which protrudes radially inwardly from the groove so that the spring ring limits a stroke of the piston in a direction towards the cover.
14 . The pedal travel simulator as recited in claim 13 , further comprising:
a force transmitter that is situated between the piston and the first spring element and that transmits an elastic force of the first spring element to the piston; and
a fitting that holds the first spring element in the cover and that also holds the force transmitter in or at the cover.
15 . The pedal travel simulator as recited in claim 14 , further comprising:
a second spring element, with the first spring element pressing against a first surface of the force transmitter that faces away from the piston and towards the cover and the second spring element arranged so that the second spring element applies a force against a second surface of the force transmitter that faces towards the piston and away from the cover, the second spring element thereby pressing the piston and the force transmitter apart.
16 . The pedal travel simulator as recited in claim 14 , wherein the force transmitter protrudes into the first spring element.
17 . The pedal travel simulator as recited in claim 14 , wherein the fitting is clampingly held in the cover.
18 . The pedal travel simulator as recited in claim 13 , wherein a support disk is situated in the cover on a side of the first spring element facing away from the piston, and transfers the elastic force of the first spring element close to a circumference to the cover.
19 . The pedal travel simulator as recited in claim 13 , wherein the first spring element (i) applies the force (a) in a first direction towards a face of the cover that faces the piston and (b) in a second direction opposite the first direction towards the face of the piston that faces the cover, and (ii) is formed as a disk spring packet that includes a plurality of spring disks that are stacked one against another in the first and second directions.