BRAKE PUMP AIR VALVE AND COOLING MEANS

• US 3,670,854 A
• Filed: 07/06/1970
• Issued: 06/20/1972
• Est. Priority Date: 07/06/1970
• Status: Expired due to Term

• Current Assignee: Raymond J. Maci
• Original Assignee: Raymond J. Maci
• Inventors: Maci, Raymond J.
• Primary Examiner(s): Halvosa, George E. A.
• Application Number:
  US05/052,211
• Time in Patent Office: 715 Days
• Field of Search: 192/113B 188/71.6,72.2,72.6,72.9,264D,264E,264P,16F
• US Class Current: 188/71.6
• CPC Class Codes: B60T 11/103 in combination with other control devices conjoint control of brake system and at least another sub-unit B60W10/188
• CPC Class Codes: B62D 11/08 using brakes or clutches as main steering-effecting means
• CPC Class Codes: F16D 65/853 with closed cooling system

Abstract

A cross-drive transmission having a multi plate brake on each output shaft and a hydraulic and mechanical actuation and cooling system including a cylinder mounted for a rotary and axial movement on a fixed piston and a cam mechanism therebetween responsive to rotary movement of the cylinder to axially move the cylinder for a brake application. Movement of the brake apply linkage connected to the cylinder rotates the cylinder to cause the cam mechanism to mechanically apply the brake against a first rotary plate which assists rotation of the cylinder for a self energizing brake application. On the supply of fluid to the cylinder chamber, the cylinder engages the first plate and rotation thereof actuates the cam mechanism for self energized brake application. The brake plate cooling system has a pump supplying coolant thereto which has an air vent valve in its intake to discontinue cooling fluid supply when the air valve is open by the brake linkage in the brake off position. When the brake is applied, either hydraulically or mechanically, the linkage is respectively either moved by the self energizing action of the brake or by the manual brake apply movement respectively to close the air valve to provide coolant supply.

Claims

1. In a brake;

a fixed housing;

a drum mounted for rotation on said housing;

a plurality of annular brake plates alternately splined to said drum and said housing;

fluid motor means having a piston mounted on said housing, a cylinder rotatably mounted on said piston defining a chamber, cam means between said cylinder and housing responsive to rotation of said cylinder relative to said piston to move said cylinder to engage said brake plates and operative on the supply of fluid to said chamber to move to engage a brake plate splined to said drum to rotate said cylinder to actuate said cam means for self energizing hydraulic engagement of said brake plates for brake application;

cooling means including a pump having an intake vent supplying cooling fluid to said brake plates and an air valve operative in open position to open the vent to discontinue the cooling fluid supply and in closed position to close the vent to provide the cooling fluid supply and lever means connected to said cylinder and said air valve and movable to rotate said cylinder for mechanical self energizing engagement of said plates for brake application and movable in response to said rotation of said cylinder during both mechanical and hydraulic brake application to close said air valve to provide cooling fluid supply during both movements of said lever means.

2. In a brake;

a fixed housing;

a rotary element mounted for rotation on said housing;

a plurality of brake members, one brake member mounted on said element and another brake member mounted on said housing for relative rotary and relative engaging movement;

fluid motor means having one portion mounted on said housing, another portion mounted on said one portion for apply movement and engaging movement to engage said one brake member and said portions defining a chamber therebetween, cam means between said portions responsive to relative apply movement of said portions to move said another portion in engaging movement to engage said one brake member for self energized additional apply movement to engage said brake members and operative on the supply of fluid to said chamber to provide engaging movement of said another portion to engage said one brake member to engage said brake members to provide self energized apply movement of said another portion to actuate said cam means for self energizing hydraulic mechanical engagement of said brake members for brake application, cooling means operative in one position to discontinue the cooling fluid supply and in another position to provide the cooling fluid supply to said brake members;

a brake apply actuator to provide a mechanical brake apply force and lever means connected to said brake apply actuator, said cooling means and said another portion for movement by said brake apply actuator to cause said apply movement of said another portion for mechanical self energizing engaging movement of said brake members for mechanical brake application and for movement by said another portion in response to apply movement of said another portion during hydraulic mechanical brake application and responsive to both movements during both mechanical and hydraulic brake application operative to position said cooling means in said another position to provide cooling fluid supply during both mechanical and hydraulic brake application.

3. In a brake;

a fixed housing;

a drum mounted for rotation on said housing;

a plurality of annular brake plates including a rotary plate splined to said drum and a fixed plate splined to said housing;

annular fluid motor means having an annular piston mounted on said housing, an annular cylinDer mounted on said piston for rotary movement and axial movement for engaging a rotary plate and defining a chamber therebetween operative on the supply of fluid to said chamber to axially move said cylinder to engage said rotary plate to rotate said cylinder, cam means between said cylinder and piston responsive to rotation of said cylinder relative to said piston to provide axial self energizing movement of said cylinder to engage said brake plates;

cooling means including a pump having an intake passage having an air vent for supplying cooling fluid to said brake plates and an air valve operative in open position to open said vent to atmosphere to discontinue the cooling fluid supply and having a spring biasing said valve to closed position to close said air vent to provide the cooling fluid supply;

a brake apply actuator operative to provide a mechanical brake apply force;

a brake apply hydraulic actuator operative to supply fluid to said chamber to axially move said cylinder to engage said rotary plate to rotate said cylinder to actuate said cam means for hydraulic self energizing brake engagement; and

lever means connected to said cylinder, said mechanical actuator and said air valve and operative in a normal brake disengaged position to move said air valve against said spring to open said air valve and for movement by said mechanical actuator from said normal brake disengaged position to a brake apply position to transmit said mechanical brake apply force to said cylinder to rotate said cylinder to actuate said cam means for mechanical self energizing engagement of said plates for brake application and for movement from said normal brake disengaged position to a brake apply position in response to said rotation of said cylinder during hydraulic brake application and operative to permit closing of said air valve by said spring to provide cooling fluid supply during both said movement by said mechanical actuator during mechanical brake actuation and said movement of said lever means by said cylinder during hydraulic brake actuation for cooling during both hydraulic and mechanical brake application.

4. In a brake;

a fixed housing;

a drum mounted for rotation on said housing;

a plurality of annular brake plates alternately splined to said drum and said housing;

annular fluid motor means having an annular piston mounted on said housing, an annular cylinder mounted for rotary and axial movement on said piston and defining a chamber, cam means between said cylinder and piston responsive to rotation of said cylinder relative to said piston to axially move said cylinder to engage said brake plates and operative on the supply of fluid to said chamber to axially move said cylinder to engage a brake plate splined to said drum to rotate said cylinder to actuate said cam means to further axially move said cylinder for self energizing hydraulic engagement of said brake plates for brake application;

cooling means including a pump having an intake passage having a vent and supplying cooling fluid to said brake plates and an air valve operative in open position to open said vent to atmosphere to discontinue the cooling fluid supply and in closed position to close said vent to provide the cooling fluid supply and lever means connected to said cylinder and air valve and operative in a normal brake disengaged position to open said air valve and movable to rotate said cylinder for mechanical self energizing engagement of said plates for brake application and movable in response to rotation of said cylinder during both hydraulic and mechanical brake application to close said air valve to provide cooling fluid supply during both movements of said lever means for both hydraulic and mechanical brake application.

5. The invention defined in claim 4 and said air valve being spring biased to closed position, said lever means in said normal brake disengaged position holding said air valve open and operative on movement during hydraulic and mechanical brake engagement to permit said spring tO close said air valve.

6. The invention defined in claim 4 and said lever means including a pivoted lever, an actuator cam rotating said pivoted lever, a link connecting said pivoted lever to said cylinder and said pivoted lever actuating said air valve.

7. The invention defined in claim 4 and said air valve being spring biased to said closed position, said lever means being connected to said cylinder to positively rotate said cylinder in response to lever movement and through a spring to move said lever in response to rotation of said cylinder and a lost motion connection to said air valve to limit closing load on said air valve.