CN1170066C - Combination shock valve - Google Patents

Abstract

The present invention is a combined shifting buffer valve in an electronic automatic transmission for automobiles. The present invention can effectively overcome the inertial impact of the shift oil cylinder movement and realize smooth shifting. The purpose of the present invention is to provide a compact structure, low cost, By using the combination of the check valve and the damping hole on the spool, the spool not only acts as a buffer piston for the operation of the oil cylinder, but also plays the role of controlling the reversing buffer direction, so that the spool is not only the actuator but also the control element.

Description

Combined buffer valve

Affiliated technical field:

The present invention is the gearshift combined buffer valve in a kind of automotive electronics automatic transmission.The present invention can effectively overcome the inertia impact of gearshift oil cylinder motion.Make the selector fork of the promotion mechanical gear box of oil cylinder balance, realize steadily gearshift.

Background technique:

At present, adopt the mechanical gear box gearshift mode of electrichydraulic control.When oil cylinder promotes the shift fork gearshift, particularly when low gear is shifted gears, tangible impulsive sound is arranged, at this moment make the flexibility of automobile running be subjected to great infringement, can't large-scale promotion.

Summary of the invention:

Purpose of the present invention provides a kind of compact structure, and cost is low.Utilize the combination of the damping hole on one-way valve and the spool, make spool both play the damper piston effect of oil cylinder operation, play the effect of control commutation buffering direction again simultaneously.Spool be executive component be again control unit.

Spool profile of the present invention is a piston-like, is to load onto this one-way valve on valve body.Make the pressure oil that enters from the hydraulic fluid port end, left chamber that can not the direct admission valve body, but push right one-way valve open, make pressure oil enter the lumen of valve body.Spool is contained in the valve body.

Be drilled with damping hole on the spool, be communicated with left chamber and lumen on the valve body, spool is contained in the valve body center.Simultaneously, the valve body upper right chamber communicates with exhaust end by passage.Chamber, a left side communicates by end with left one-way valve, and lumen communicates with the end of opening of right one-way valve.The end of opening of left side one-way valve communicates with the end that ends of right one-way valve.The spool left end is loaded onto joint, is connected the passage of valve body bonnet boring conduct and exhaust port with gearshift oil cylinder piston pull bar.O-ring seal is loaded onto in the valve body front end and back end.Fixing left one-way valve of left oil port joint and spring.Communicate with left chamber by left one-way valve simultaneously, right oil port communicates with lumen.Right one-way valve and spring are fixed by plug.

Since adopt such scheme, can be when the gearshift oil cylinder move to by end left, and combined buffer valve plays buffer function.When the gearshift oil cylinder moved right by end, combined buffer valve also can play buffer function.And cushion effect is significantly less than the cushion effect when left movement.Thereby effectively guaranteed the self-shifting stationarity of gearbox.

Description of drawings:

Fig. 1 is a plan view of the present invention.Fig. 2 is the A-A sectional view.

Embodiment

As shown in Figure 1: spool 9 profiles of the present invention are piston-like, are to load onto left one-way valve 8 on valve 1.Make the pressure oil that enters from left oil port 7, lumen 3 that can not direct admission valve body 1.Spool 9 is contained in central position in the valve body 1.Be drilled with damping hole 12 on the spool 9, be communicated with left chamber 2 lumens 3 on the valve body 1.Valve body upper right chamber 4 communicates with exhaust end by exhaust port 11 simultaneously.Chamber 2, a left side communicates by end 17 with left one-way valve 8, and lumen 3 communicates with the end of opening of right one-way valve 6.Spool 9 left ends are loaded onto joint 10, are connected with gearshift oil cylinder piston pull bar 13.Valve body bonnet 5 boring, as with the passage of exhaust port 11.O-ring seal 15,16 is loaded onto in valve body 1 front end and back end.Left oil port joint 7 fixing left one-way valve 8 and springs.The end of opening of left side one-way valve 8 communicates with the end that ends of right one-way valve 6.Simultaneously, communicate with left chamber 2 by left one-way valve 8, right oil port 14 communicates with lumen 3, and right one-way valve 6 and spring are fixing by plug 18.

Claims (3)

1. A combination buffer valve is composed of a valve core and a valve body, and its characteristic is that the valve core is in the shape of a piston, installed in the center of the valve body, and a damping hole is drilled on the valve core, which communicates with the left cavity and the middle cavity of the valve body , the right chamber on the valve body communicates with the exhaust hole through the channel, the left chamber communicates with the cut-off end of the left one-way valve, the middle chamber communicates with the opening end of the right one-way valve, and the opening end of the left one-way valve communicates with the right one-way valve. The cut-off ends of the valves are connected. 2. The combined buffer valve according to claim 1, characterized in that: the left end of the spool is fitted with a joint to connect with the piston rod of the shift cylinder. 3. The combination buffer valve according to claim 1, characterized in that: the valve body has two oil inlet and outlet ports, the left oil port communicates with the left chamber through the left check valve, and the right oil port communicates with the middle chamber.

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