CN2890350Y

CN2890350Y - Starting pressure-release and reversal pressure-release device

Info

Publication number: CN2890350Y
Application number: CNU2006200553301U
Authority: CN
Inventors: 谢锡祥; 赵永周; 王万洪; 舒桂明
Original assignee: GUANGZHOU PANYU HUANAN MOTORS GROUP CO Ltd
Current assignee: GUANGZHOU PANYU HUANAN MOTORS GROUP CO Ltd
Priority date: 2006-02-22
Filing date: 2006-02-22
Publication date: 2007-04-18
Anticipated expiration: 2016-02-22
Also published as: WO2007095819A1

Abstract

The utility model is a starting pressure-release and reversal pressure-release device belonging to motor field. A guide pin and a return spring are inserted into a corresponding hole on a camshaft. A starting decompression cam is arranged in the camshaft in alignment with the guide pin and the return spring. A one-way clutch is connected with a reversal pressure-release cam by a pin and arranged in the camshaft. A washer is arranged in the camshaft, and a chain wheel interference is also arranged in the camshaft. A cylinder head is provided with a reversal cam limit pin to limit the one-way clutch, the pin and the reversal pressure-release cam. The utility model is simple in structure. The combination use of the starting pressure-release device and the reversal pressure-release device is compact in structure, improves starting performance, and increases reliability and durability of the motor.

Description

Starting decompression and counter-rotating decompressor

Technical field

The utility model starting decompression and counter-rotating decompressor belong to engine art, particularly relate to a kind of two-wheeled motor vehicle, motor tricycle, four-wheel motor vehicle of being applied to, and are installed in the starting decompressor of single cylinder, four-stroke, large-duty engine camshaft.

Prior art

Because the crank-connecting rod piston mechanism rotating mass of single cylinder, big discharge capacity reciprocating internal combustion engine is big, compression stroke piston resistance is big, when engine displacement during greater than 250cc, pulls quite difficulty of starting, the load of actuating motor is big during the electricity starting, the starting mechanism of decompressor must be set reduce starting resistance; Because the phenomenon of single cylinder, the flame-out counter-rotating of four-stroke reciprocating internal combustion ubiquity, the impact that bent axle moment counter-rotating brings is very big to the destruction of gear class especially starting gear, when engine displacement during greater than 250cc, bent axle counter-rotating harm can not be ignored, the counter-rotating mechanism of decompressor must be set to be prevented, domestic motorcycle, ATV still do not have effective solution with four-cycle, single-cylinder machine field, have hindered domestic motorcycle, ATV industry to the big discharge capacity development of single cylinder.

The model utility content

The purpose of this utility model is to avoid the deficiencies in the prior art part; and provide a kind of starting decompressor that on the camshaft of motor, is provided with; reducing cylinder presses; reduce starting resistance; improve starting performance, improve the practicability of motor, the counter-rotating mechanism of decompressor is set on the camshaft of motor; transmission, starting gear are protected, improved the reliability and the durability of motor.

The purpose of this utility model reaches by following measure, and it is by camshaft, chain pulley seat, and packing ring, overrunning clutch, pin, the counter-rotating relief cam, the starting relief cam, the inverse cam position limit pin, guide finger, return spring is formed.Guide finger, return spring insert on the camshaft in the respective aperture, starting relief cam alignment guide pin, return spring are packed in the camshaft, pin is connected overrunning clutch with the counter-rotating relief cam, the camshaft of packing into, the packing ring camshaft of packing into, the chain pulley seat interference camshaft of packing into, in cylinder head the inverse cam position limit pin is set, to overrunning clutch, pin, the counter-rotating relief cam carries out spacing.Overrunning clutch is connected by pin with the counter-rotating relief cam.

During camshaft static state to 200～300rpm, the pressure of return spring will start relief cam jack-up, make the molded lines that starts the relief cam correspondence be higher than the basic circle of cam, when camshaft speed during greater than 200～300rpm, the centrifugal force of starting relief cam overcomes the pressure of return spring outwards around the rotation of the center of pin, drives reduction valve and rotates, and forwards the spacing position of decompression dish seat to up to the decompression valve pin, make the flat quadrate part of reduction valve divide arc surface towards the camshaft center, reduction valve is lower than the basic circle of cam.

When camshaft is rotated in the forward, overrunning clutch is surmounted, the stop bit boss of overrunning clutch is run into inverse cam position limit pin on the cylinder head and is limited, the reverse this moment gap of relief cam and exhaust rocker arm is very little, does not lift but exhaust rocker arm can not be inverted relief cam, in case the camshaft counter-rotating time, overrunning clutch drives the counter-rotating relief cam and also reverses, the step of exhaust rocker arm contacts with the counter-rotating relief cam at once, opens exhaust valve, reduces cylinder and presses.

The utility model is simple in structure, and starting decompressor and counter-rotating decompressor are used in combination compact structure, starting decompressor and counter-rotating decompressor all act on the exhaust valve, when the engine crankshaft low speed rotation, open exhaust valve, reduce cylinder and press, reduce starting resistance, improve starting performance, when engine crankshaft reverses, open exhaust valve, reduce cylinder and press, reduce the driving force of bent axle counter-rotating, reliable in function has improved the reliability and the durability of motor.

Description of drawings

Accompanying drawing 1 is the A-A generalized section of accompanying drawing 2.

Accompanying drawing 2 is structural representations of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As accompanying drawing 1, shown in the accompanying drawing 2, the utility model camshaft 1, chain pulley seat 2, packing ring 3, overrunning clutch 4, pin 5, counter-rotating relief cam 6, starting relief cam 7, inverse cam position limit pin 8, guide finger 9, return spring 10, with guide finger, return spring inserts on the camshaft in the respective aperture, to start relief cam alignment guide pin, return spring is packed in the camshaft, with pin the overrunning clutch and the relief cam that reverses is connected the camshaft of packing into, the camshaft of then packing ring being packed into, the camshaft of at last the chain pulley seat interference being packed into is provided with the inverse cam position limit pin in cylinder head, to overrunning clutch 4, pin 5, the assembly of counter-rotating relief cam 6 carries out spacing.

Claims

1, a kind of starting decompression and counter-rotating decompressor is characterized in that by camshaft chain pulley seat, packing ring, overrunning clutch, pin, the counter-rotating relief cam, starting relief cam, inverse cam position limit pin, guide finger, return spring are formed, and guide finger, return spring insert on the camshaft in the respective aperture, starting relief cam alignment guide pin, return spring are packed in the camshaft, overrunning clutch is connected by pin with the counter-rotating relief cam, and packing ring is contained in camshaft, in cylinder head the inverse cam position limit pin is set.