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US 11,752,992 B2Granted
Hydraulic control valve brake system
AssigneeZhejiang CFMOTO Power Co., Ltd.
InventorXiaolei Zhang
Life of this patent
Estimating the term…
Abstract
A hydraulic control valve for an ATV or motorcycle takes hydraulic input from a hand brake lever as an input to a first cavity of the control valve with a movable piston therein, and from a foot brake lever as an input to a second cavity of the control valve with a movable piston therein, with the two pistons being linked. A bypass channel extends around the piston in the first cavity, which is closed off when the first piston moves longitudinally. The output of the first cavity hydraulically controls braking of the front wheel(s). The foot brake lever also pressurizes a direct line to brake the rear wheel(s) that doesn't go through the control valve.
Claims20
A hydraulic control valve for a vehicle braking system, the control valve comprising:
- a valve body defining a first brake fluid cavity;
- a first piston which is longitudinally moveable within the first brake fluid cavity;
- a first input port in the valve body and accessible on an outside of the valve body for receiving brake fluid, the first input port always being in fluid communication with a first area of the first piston;
- a first output port in the valve body and accessible on an outside of the valve body for delivering brake fluid, the first output port always being in fluid communication with a second area of the first piston;
- a bypass channel defined in the valve body for the first brake fluid cavity, the bypass channel allowing pressurized brake fluid flow from the first input port around an edge of the first piston and out the first output port when the first piston is in a first longitudinal position, the bypass channel being closed off when the first piston is in a range of second longitudinal positions;
- a spring providing a spring force which can bias the first piston longitudinally toward the first longitudinal position;
- and
- a linkage for selectively moving the first piston from the first longitudinal position to the range of second longitudinal positions against the spring force of the spring, wherein, when the first piston is within the range of second longitudinal positions with the bypass channel being closed off, either greater pressure on the first area of the first piston through the first input port and/or greater force through the linkage biases the first piston in a direction further away from the first longitudinal position.
5 more elements
A brake system for a vehicle, comprising:
- a first braking control mountable on the vehicle for control by a driver, the first braking control pressurizing brake fluid;
- a second braking control mountable on the vehicle for separate control by the driver, the second braking control pressurizing brake fluid, a brake on a first wheel of the vehicle being in fluid communication with brake fluid pressurized by the second braking control, so the brake on the first wheel is solely controlled by the second braking control;
- a control valve mounted in the vehicle, the control valve comprising:
- a valve body mounted on the vehicle;
- a first input port in the valve body, the first input port receiving brake fluid pressurized by the first braking control;
- a second input port in the valve body, the second input port receiving brake fluid pressurized by the second braking control;
- and
- a first output port in the valve body, the first output port output being in fluid communication with a brake on a second wheel of the vehicle longitudinally spaced on the vehicle from the first wheel, wherein the first output port can be pressurized solely through pressurization from the first braking control, can alternatively be pressurized solely through pressurization from the second braking control, and can alternatively be pressurized through pressurization from both the first and second braking controls, wherein the first output port is in a completely separate circuit than the second input port such that brake fluid received in the second input port is never output through the first output port;
- wherein, during braking operation of the first and/or second braking controls, all brake fluid flow into or out of the valve body occurs through the first input port, the second input port and the first output port;
- and
- wherein the first braking control has a first braking control response pressure, with increasing pressurization from the second braking control simultaneously decreasing first braking control response pressure.
8 more elements
A brake system for a vehicle, comprising:
- a first braking control mountable on the vehicle for control by a driver, the first braking control pressurizing brake fluid;
- a second braking control mountable on the vehicle for separate control by the driver, the second braking control pressurizing brake fluid, a brake on a first wheel of the vehicle being in fluid communication with brake fluid pressurized by the second braking control, so the brake on the first wheel is solely controlled by the second braking control;
- a control valve mounted in the vehicle, the control valve comprising:
- a valve body mounted on the vehicle;
- a first input port in the valve body, the first input port receiving brake fluid pressurized by the first braking control;
- a second input port in the valve body, the second input port receiving brake fluid pressurized by the second braking control;
- a first output port in the valve body, the first output port output being in fluid communication with a brake on a second wheel of the vehicle longitudinally spaced on the vehicle from the first wheel, wherein the first output port can be pressurized solely through pressurization from the first braking control, can alternatively be pressurized solely through pressurization from the second braking control, and can alternatively be pressurized through pressurization from both the first and second braking controls, wherein the first output port is in a completely separate circuit than the second input port such that brake fluid received in the second input port is never output through the first output port;
- a first brake fluid cavity defined in the valve body;
- a first piston which is longitudinally moveable within the first brake fluid cavity, with brake fluid through the first input port being in fluid communication with a first area of the first piston;
- a second brake fluid cavity defined in the valve body;
- and
- a second piston which is longitudinally moveable within the second brake fluid cavity, with brake fluid through the second input port being in fluid communication with a first area of the second piston, the second piston being linked to the first piston;
- wherein, during braking operation of the first and/or second braking controls, all brake fluid flow into or out of the valve body occurs through the first input port, the second input port and the first output port.
10 more elements
A brake system for a vehicle, comprising:
- a first braking control mountable on the vehicle for control by a driver, the first braking control pressurizing brake fluid;
- a second braking control mountable on the vehicle for separate control by the driver, the second braking control pressurizing brake fluid, a brake on a first wheel of the vehicle being in fluid communication with brake fluid pressurized by the second braking control, so the brake on the first wheel is solely controlled by the second braking control;
- a control valve mounted in the vehicle, the control valve comprising:
- a valve body mounted on the vehicle;
- a first input port in the valve body, the first input port receiving brake fluid pressurized by the first braking control;
- a second input port in the valve body, the second input port receiving brake fluid pressurized by the second braking control;
- a first output port in the valve body, the first output port output being in fluid communication with a brake on a second wheel of the vehicle longitudinally spaced on the vehicle from the first wheel, wherein the first output port can be pressurized solely through pressurization from the first braking control, can alternatively be pressurized solely through pressurization from the second braking control, and can alternatively be pressurized through pressurization from both the first and second braking controls, wherein the first output port is in a completely separate circuit than the second input port such that brake fluid received in the second input port is never output through the first output port;
- a first brake fluid cavity defined in the valve body;
- a first piston which is longitudinally moveable within the first brake fluid cavity, with brake fluid through the first input port being in fluid communication with a first area of the first piston;
- a second brake fluid cavity defined in the valve body;
- a second piston which is longitudinally moveable within the second brake fluid cavity, with brake fluid through the second input port being in fluid communication with a first area of the second piston, the second piston being linked to the first piston;
- and
- a bypass channel for the first brake fluid cavity, the bypass channel being defined in the valve body and allowing brake fluid flow around an edge of the first piston when the first piston is in a first longitudinal position, the bypass channel being closed off when the first piston is in a range of second longitudinal positions.
10 more elements
Dependencies are inferred from the claim text.