Vehicle braking devices

• US 3,924,713 A
• Filed: 05/10/1973
• Issued: 12/09/1975
• Est. Priority Date: 05/26/1972
• Status: Expired due to Term

• Current Assignee: Pierre Etienne Bessiere
• Original Assignee: Pierre Etienne Bessiere
• Inventors: Bessiere, Pierre Etienne
• Primary Examiner(s): Blix, Trygve M.
• Assistant Examiner(s): Kazenske, Edward R.
• Application Number:
  US05/358,939
• Time in Patent Office: 943 Days
• Field of Search: 188/290,296 60/336,378,453 192/3R,3TR
• US Class Current: 188/296
• CPC Class Codes: B60T 1/087 in hydrodynamic, i.e. non-positive displacement, retarders
• CPC Class Codes: F16D 57/04 with blades causing a directed flow, e.g. Föttinger type
• CPC Class Codes: F16D 65/78 Features relating to cooling

Abstract

A hydraulic brake supplied by water which circulates successively through a pump and a radiator forming an expansion vessel, and a purging pipe being provided between the center of the brake and the top of said vessel. A control device responsive to the pressure existing at a point in the water system and situated downstream of the brake. The device controls a value which automatically closes the purging pipe during the working phases of the brake and opens the pipe on the placing in and out of service of the brake. The brake is particularly advantageous for rapid passenger vehicles.

Claims

1. Hydraulic vehicle braking apparatus, comprising a housing;

a closed fluid system for supplying fluid to, and emptying fluid from said housing, said system including an expansion vessel (3);

a first purging pipe (6) connecting the center portion of said brake housing with the top of said expansion vessel, whereby the inner gaseous volume at the center of said brake means is conducted to the top of the vessel;

valve means (18) connected in said purging pipe, said valve means being operable between open and closed conditions to afford and to interrupt communication, respectively, between said housing and said expansion vessel; and

means responsive to the pressure of the fluid emptying from said housing in said system for controlling the operation of said valve means to cause said valve means to be in the open condition for a given time delay period (tA) during the initial filling of the housing and to be in the closed condition during the remainder of the filling period, said control means being operable to cause said valve means to be in the open condition during the entire period of emptying of fluid (t'"'"''"'"'x) from said housing.

2. Apparatus as defined in claim 1, wherein said valve control means are automatically operable as a function of the activation and de-activation of said brake means.

3. Apparatus as defined in claim 2, wherein said valve control means responsive to the pressure of the fluid emptying from said housing is operable to cause said valve means to close said purging pipe when the brake fluid pressure exceeds a predetermined threshold value.

4. Braking apparatus according to claim 3, wherein the valve means is an electrovalve and the pressure responsive means includes an electric manostat adapted to control said electrovalve.

5. Braking apparatus according to claim 3, wherein the pressure responsive means includes a diaphragm through which the pressure of the liquid is applied, said diaphragm is adapted to exert a time delay effect proportional to said pressure.

6. Braking apparatus according to claim 5, wherein the diaphragm has a convergent shape in the direction of the means sensitive to the pressure of the liquid.

7. Apparatus as defined in claim 1, wherein said control means includes venturi means (26) connected downstream of said housing, said venturi means including a throat portion;

and further including a second purging pipe (25) connected bEtween said housing and the throat portion of said venturi means, whereby a suction effect is exerted by said venturi means on the gaseous volume appearing at the vortex of the hydraulic fluid in said housing.

8. Apparatus as defined in claim 7, wherein said venturi means includes a venturi tube (26) arranged in spaced relation in a housing;

and further including a diaphragm (29) arranged concentrically between said venturi tube and said housing to define a second venturi throat, and third conduit means (30) connecting said second venturi throat with the central portion of said housing.

9. Apparatus as defined in claim 7, wherein said second purging pipe (31) communicates with the central portion of said housing via a portion of said first purging pipe.

10. Apparatus as defined in claim 9, wherein said valve means comprises a three-way two-position valve having a pair of outlets connected with said expansion vessel and with said venturi means, respectively, and an inlet connected with the central portion of the housing, whereby said housing is alternately connected with said expansion vessel and with said venturi means, respectively.

11. Apparatus as defined in claim 1, and further including means operable by an operator of the vehicle for neutralizing the automatic closing control of the purging pipe.