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US 2026/0274226 A1Published application
Brake System For All-Terrain Vehicle
AssigneeZhejiang CFMOTO Power Co., Ltd.
InventorsXufeng Ding, Hang Li, Jingjie Cheng, Guanglin Wang
Life of this patent
Estimating the term…
Abstract
A hydraulic brake valve in an ATV brake system has rear and front pistons slidable within a valve body. The front piston divides a chamber of the valve body into a front chamber area and an intermediate chamber area between the pistons. When depressing a brake pedal moves the rear piston through a foot control rod, brake fluid from the intermediate chamber area activates rear-wheel brake assemblies, and the intermediate spring moves the front piston so brake fluid from the front chamber area activates the front-wheel brake assemblies. Pressing of the handbrake lever when the brake pedal is not being pressed controls only the front-wheel brake assemblies.
Claims20
A brake system for an all-terrain vehicle, comprising:
- a hydraulic brake valve comprising:
- a valve body defining a chamber having an axis, the valve body further defining a handbrake fluid input port, a rear output port, a front output port and a brake fluid supplement port, each of the handbrake fluid input port, the rear output port, the front output port, and the brake fluid supplement port being in fluid communication with the chamber;
- a rear piston slidably received in the chamber of the valve body for movement along the axis;
- a foot control rod coupled to the rear piston;
- a front piston slidably received in the chamber of the valve body for movement along the axis, the front piston dividing the chamber into a front chamber area forward of the front piston and an intermediate chamber area between the front piston and the rear piston, the front output port being in fluid communication with the front chamber area and the rear output port being in fluid communication with the intermediate chamber area;
- and
- an intermediate spring received in the intermediate chamber area of the valve body, the intermediate spring transmitting spring force between the rear piston and the front piston;
- two rear-wheel brake assemblies in fluid communication with the intermediate chamber area through the rear output port and through rear brake fluid delivery pipelines;
- two front front-wheel brake assemblies in fluid communication with the front chamber area through the front output port and through front brake fluid delivery pipelines;
- a brake pedal coupled to the foot control rod, such that pressing of the brake pedal can directly move the rear piston to control the rear-wheel brake assemblies and can through the intermediate spring move the front piston to control the front-wheel brake assemblies;
- and
- a handbrake in fluid communication with the handbrake fluid input port through a handbrake fluid delivery pipeline, the handbrake having a handbrake lever, such that pressing of the handbrake lever when the brake pedal is not being pressed controls only the front-wheel brake assemblies.
9 more elements
A brake system for an all-terrain vehicle, comprising:
- a hydraulic brake valve comprising:
- a valve body defining a chamber having an axis, the valve body further defining a handbrake fluid input port, a rear output port and a front output port, each of the handbrake fluid input port, the rear output port and the front output port being in fluid communication with the chamber;
- a rear piston slidably received in the chamber of the valve body for movement along the axis;
- a foot control rod coupled to the rear piston;
- a front piston slidably received in the chamber of the valve body for movement along the axis, the front piston dividing the chamber into a front chamber area forward of the front piston and an intermediate chamber area between the front piston and the rear piston, the front output port being in fluid communication with the front chamber area and the rear output port being in fluid communication with the intermediate chamber area, wherein the front piston defines at least one front compensation hole, and wherein the handbrake fluid input port is, depending upon axial position of the front piston, either in bi-directional fluid communication with the front chamber area through the front compensation hole or unidirectionally sealed from the front chamber area so brake fluid can flow only from the handbrake fluid input port into the front chamber area;
- an intermediate spring received in the intermediate chamber area of the valve body, the intermediate spring transmitting spring force between the rear piston and the front piston;
- and
- a front spring arranged between the front piston and the valve body, biasing the front piston toward the rear piston;
- two rear-wheel brake assemblies in fluid communication with the intermediate chamber area through the rear output port and through rear brake fluid delivery pipelines;
- two front front-wheel brake assemblies in fluid communication with the front chamber area through the front output port and through front brake fluid delivery pipelines;
- a brake pedal coupled to the foot control rod, such that pressing of the brake pedal can directly move the rear piston to control the rear-wheel brake assemblies and can through the intermediate spring move the front piston to control the front-wheel brake assemblies;
- and
- a handbrake in fluid communication with the handbrake fluid input port through a handbrake fluid delivery pipeline, the handbrake having a handbrake lever, such that pressing of the handbrake lever when the brake pedal is not being pressed controls only the front-wheel brake assemblies.
10 more elements
An all-terrain vehicle comprising:
- a frame;
- a suspension system connected to the frame;
- a plurality of wheels connected to the suspension system, and comprising two front wheels and two rear wheels;
- a steering system connected to the two front wheels and comprising a handlebar;
- and
- a hydraulic brake system comprising:
- a hydraulic brake valve comprising:
- a valve body defining a chamber having an axis, the valve body further defining a handbrake fluid input port, a rear output port and a front output port, each of the handbrake fluid input port, the rear output port and the front output port being in fluid communication with the chamber;
- a rear piston slidably received in the chamber of the valve body for movement along the axis;
- a foot control rod coupled to the rear piston;
- a front piston slidably received in the chamber of the valve body for movement along the axis, the front piston dividing the chamber into a front chamber area forward of the front piston and an intermediate chamber area between the front piston and the rear piston, the front output port being in fluid communication with the front chamber area and the rear output port being in fluid communication with the intermediate chamber area;
- and
- an intermediate spring received in the intermediate chamber area of the valve body, the intermediate spring transmitting spring force between the rear piston and the front piston;
- two rear-wheel brake assemblies in fluid communication with the intermediate chamber area through the rear output port and through rear brake fluid delivery pipelines, each of the rear-wheel brake assemblies being for braking one of the two rear wheels;
- two front front-wheel brake assemblies in fluid communication with the front chamber area through the front output port and through front brake fluid delivery pipelines, each of the front-wheel brake assemblies being for braking one of the two front wheels;
- a brake pedal coupled to the foot control rod, such that pressing of the brake pedal can directly move the rear piston to control the rear-wheel brake assemblies and can through the intermediate spring move the front piston to control the front-wheel brake assemblies;
- and
- a handbrake in fluid communication with the handbrake fluid input port through a handbrake fluid delivery pipeline, the handbrake having a handbrake lever supported on the handlebar, such that pressing of the handbrake lever when the brake pedal is not being pressed controls only the front-wheel brake assemblies.
15 more elements
Dependencies are inferred from the claim text.