Patent EP0140863A2 successfully refreshed from Google Patents.
EP0140863A2
Expired / Lapsed
EP
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Braking force modulator
Assignee: Individual
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Filing: 1984-10-29
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Granted: —
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Expires: 2004-10-29
Abstract
Abstract The present invention briefly refers to a braking force modulator for hydraulic vehicle brakes. The braking force modulator is intended to be inserted into the braking fluid conduit between the main cylinder or the like and one or more of the wheel braking cylinders and it is controlled by a sensoring system for performing the braking force modulation. The braking force modulator comprises a piston pump unit (12) with normally open inlet and outlet valves (37, 38) adapted to be closed under the action of a solenoid device (47, 48, 49, 52) whereby the unit is conditioned to act as a piston pump. The inlet and outlet valves (37, 38) are two mutually independent units adapted to be operated individually by means of one solenoid device each.
Inventors
- 👤 Folke Ivar Blomberg
- 👤 Holst Jan-Olov Martin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:53
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/42; B60T8/4208
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
192 words
Braking force modulator (1) for hydraulic vehicle brakes intended to be inserted into the brake fluid conduit (2) between a brake fluid pressure generator (3) and the wheel braking cylinder (5) in question and to be controlled by a sensor system (7, 8), said modulator (1) comprising a piston pump unit (12) having spring-biased inlet and outlet valves (37, 38) which normally are held open by return springs (53) and electromagnetic means (47, 48, 49, 52) which during actuation close the inlet and outlet valves (37, 38) thereby conditioning the device to act as a piston pump, characterized in that the inlet and outlet valves (37, 38) constitute two mutually independent units which are operable separately by means of individual electromagnetic means (47, 48, 49, 52), that the valves are two-step valves comprising a primary valve (54) having small through-flow area and having its seat provided in a secondary valve (59) having considerably larger through-flow area, and that the electromagnetic means (47, 48, 49, 52) and the primary valve (54) are placed on the same side of the seat of the secondary valve (59) in the insert (58) as the secondary valve.
Claim 2
Dependent Claim
192 words
Braking force modulator (1) for hydraulic vehicle brakes intended to be inserted into the brake fluid conduit (2) between a brake fluid pressure generator (3) and the wheel braking cylinder (5) in question and to be controlled by a sensor system (7, 8), said modulator (1) comprising a piston pump unit (12) having spring-biased inlet and outlet valves (37, 38) which normally are held open by return springs (53) and electromagnetic means (47, 48, 49, 52) which during actuation close the inlet and outlet valves (37, 38) thereby conditioning the device to act as a piston pump, characterized in that the inlet and outlet valves (37, 38) constitute two mutually independent units which are operable separately by means of individual electromagnetic means (47, 48, 49, 52), that the valves are two-step valves comprising a primary valve (54) having small through-flow area and having its seat provided in a secondary valve (59) having considerably larger through-flow area, and that the electromagnetic means (47, 48, 49, 52) and the primary valve (54) are placed on the same side of the seat of the secondary valve (59) in the insert (58) as the secondary valve.
Claim 3
Dependent Claim
47 words
Braking force modulator as claimed in Claim 1, characterized in that the valves (37, 38) are so positioned in relation to each other and to the pumping chamber of the pumping unit (12) that this chamber forms a part of the brake fluid conduit through the modulator.
Claim 4
Dependent Claim
22 words
Braking force modulator as claimed in Claim 1 or 2, characterized in that the electromagnetic means are solenoids (47, 48, 49, 52).
Claim 5
Dependent Claim
39 words
Braking force modulator as claimed in any of the preceding Claims, characterized in that the sensor system (7, 8) controls the current supply to the solenoids (47, 48, 49, 52) of both valves for simultaneous operation of the valves.
Claim 6
Dependent Claim
45 words
Braking force modulator as claimed in any of Claims 1 - 3, characterized in that the sensor system (7, 8) controls the supply of current to the solenoids (47, 48, 49, 52) of both valves (37, 38) for separate operation of either valve (37, 38).
Claim 7
Dependent Claim
47 words
Braking force modulator as claimed in any of the preceding Claims, characterized in that return spring (53) positioned over a core (52, 152) of the solenoid (47, 48, 49, 52) is only able to separate the primary valves (54) from their seats in the secondary valve (59).
Claim 8
Dependent Claim
50 words
Braking force modulator as claimed in Claim 6, characterized in that the core (152) is provided with hook-shaped elements (66) limiting the space of movement of the secondary valve (59) from the core (152) and enabling the secondary valve (59) to be separated from its seat in the insert (158).
Claim 9
Dependent Claim
91 words
Braking force modulator as claimed in any of the preceding Claims, characterized in that at least one of the valves (37, 38) is provided with a check valve (40) controlled by one of the solenoids (47, 48, 49, 52) which when the solenoid is not actuated is lifted from its seat in a support plate (42) and then has a certain through-flow area but when the solenoid is actuated has a considerably lesser through-flow area while the check valve (40) is in contact with its seat in the support plate (42).
Claim 10
Dependent Claim
65 words
Braking force modulator as claimed in any of the preceding Claims, characterized in that the winding (47) of the solenoids (47, 48, 49, 52) in the valves (37, 38) is dimensioned for high amperage in the steady state when the chosen net voltage is applied and that devices are attached in series with the solenoid windings (47) preventing the amperage to reach the steady-state value.
Claim 11
Dependent Claim
63 words
Braking force modulator as claimed in Claim 9, characterized in that the device for limiting the amperage in the solenoid windings (47) comprises an ohmic resistor connected in series with the windings (47) and adapted to be short-circuited by a transistor shunted with the resistor and obtaining its control current from a particular induction coil wound in connection to the solenoid windings (47).
Claim 12
Dependent Claim
82 words
Braking force modulator as claimed in Claim 9, characterized in that the device for limiting the amperage in the solenoid windings (47) comprises a semi-conductor element connected in series with the windings (47) and adapted, after a certain pre-programmed period of time to let a so-called chopper inserted into the semi-conductor element chop the current to form a highfrequency pulsating direct current, the mean voltage of which is adapted to limiting the current through the solenoid windings (47) to a suitable value.
Claim 13
Dependent Claim
50 words
Braking force modulator as claimed in Claim 9, characterized in that the device for limiting the amperage in the solenoid windings (47) comprises a semi-conductor element connected in series with the windings (47) and locking the amperage at a certain pre-programmed level as soon as this level has been reached.
Claim 14
Dependent Claim
37 words
Braking force modulator as claimed in any of the preceding Claims, characterized in that the motor (10) of the piston pump unit (12) is supplied with current via a switch controlled by the applied brake fluid pressure.
Claim 15
Dependent Claim
55 words
Braking force modulator as claimed in Claim 13, characterized in that the motor (10) of the pumping unit (12) by means of a semi-conductor circuit (RC-circuit) is supplied with current during a short time subsequent to the sensor system (7, 8) having transmitted an order to terminate a down-pumping phase in a controlled braking process.
Claim 16
Dependent Claim
57 words
Braking force modulator as claimed in any of the preceding Claims, characterized in that it comprises several circuits comprising pumping units (12) and valves (37, 38) in which the pumping units (124 are driven by one and the same motor (10), the pistons receiving their oscillating movement from one and the same eccentric device (13, 14, 15).
Claim 17
Dependent Claim
19 words
Braking force modulator as claimed in Claim 15, characterized in that the pumping means (12) have different stroke volumes.
Claim 18
Dependent Claim
69 words
Braking force modulator as claimed in Claim 15 or 16, characterized in that the ends of the pistons (11, 12) facing the eccentric strap (15) are provided with spherical recesses, that corresponding spherical recesses are provided in the periphery of the eccentric strap (15) and that balls (16, 17) of lesser radius than the spherical recesses are inserted between each piston and the eccentric strap in the spherical recesses.
References Cited (Backward Citations)
No citation records indexed.
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