CN2278772Y

CN2278772Y - Tappet for automotive engine

Info

Publication number: CN2278772Y
Application number: CN 96232461
Authority: CN
Inventors: 张新; 丁沂军
Original assignee: LIMIN CHEM PLANT XINYI CITY
Current assignee: LIMIN CHEM PLANT XINYI CITY
Priority date: 1996-07-31
Filing date: 1996-07-31
Publication date: 1998-04-15
Anticipated expiration: 2006-07-31

Abstract

The utility model discloses a tappet for automotive engines. A central hole is arranged on the center of the piston of the tappet, the central hole opens from the bottom of a ball socket on the top end of the piston to the lower end, a check valve is arranged on the lower end, a check valve spring is arranged under a steel ball of the check valve, two symmetrical small holes are opened on the top edge of the check valve body, a piston working spring is arranged under the check valve, a clamp spring groove is arranged on the upper part of a wrap, a clamp spring is arranged in the groove, a lateral oil hole passes through the middle upper part of the piston to the central hole, a vertical and longitudinal oil groove is opened on the edge of the piston, one end of the oil groove is connected with the lateral oil hole, and the other end leads to the top of the piston. The tappet can automatically regulate the clearance of the air valve to the optimum state, causes fuel to be burnt completely to improve the effective power of the automotive engines.

Description

The motor car engine tappet

The utility model relates to a kind of air distributing device of motor car engine.

Known motor car engine tappet is " barrel-shaped ", tappet bottom and the work of cam of camshaft contact matching, bear the jack-up and the landing of cam, " ball-and-socket " of tappet endoporus bottom surface and valve actuating push rod bottom surface " bulb " cooperating, when distribution device installs, must check the valve clearance, adjust, adopt traditional tappet, the valve clearance must be set in Valve Rocker Organization adjust screw, with artificial way the gap is adjusted, this is subjected to certain limitation with regard to the levels of precision that makes the adjusting play, makes fuel can not get burning fully, and the power of motor can not be brought into play fully.

The purpose of this utility model provides a kind of motor car engine tappet of the valve clearance being adjusted to automatically the optimum state.

The purpose of this utility model is achieved in that the outside of tappet is a cylindrical body, and an end is uncovered, and the other end is called overcoat for cooperating cam working face.0.2 millimeter deep trouth is arranged on the cylindrical of overcoat, be used for and hold forming oil storage tank storage oil lubricating self when the hole cooperates.Piston is equipped with in the inside of overcoat, and piston and overcoat carry out tight being slidingly matched, and the quality of fit between the two has crucial effects for the working condition of tappet.Piston tip is semicircle ball-and-socket and valve actuating push rod cooperating.There is the center hole of 3 millimeters of diameters at the center of piston, passes to the lower end from piston tip ball-and-socket bottom.The lower end is the valve seat of safety check, and the safety check steel ball seals herein.The safety check steel ball is the fine grade rolling bearing steel ball of 4 millimeters of diameters.Under the safety check steel ball check-valve spring is arranged, the check valve body diameter of bore is 4.2 millimeters, is beneficial to the activity therein of safety check steel ball and check-valve spring freely.The check valve body top has the aperture of 2.5 millimeters of two disconnected diameters, and this aperture is the inlet that machine oil flows into the piston bottom.In order to reduce resistance, the hole is opened in the both sides of edges at check valve body top and is become symmetry.Safety check tips upside down in the bottom, piston lower end, and the pistons work spring is pressed to piston to the safety check body by the safety check top outer edge.Do not relatively move between safety check and the piston lower end in the time of work, be beneficial to the sealing of non-return steel ball.The pistons work spring is that modified Spring Steel Wire coiling forms, and has very high intensity and anti-fatigue ability.On the top of overcoat one jump ring groove is arranged, jump ring is housed in the groove, with the stroke of limited piston in overcoat.The piston middle and upper part has 3 millimeters oilholes of a transverse diameter to lead to center hole, and the edge of piston has vertical vertical oil groove, and oil groove one end links to each other with horizontal oilhole, and the other end passes to piston tip.

Adopt such scheme, after the long-term work of motor, the wearing clearance of valve, rocking arm, push rod, camshaft and correlated parts thereof can be compensated under the effect of pistons work spring automatically, guarantees to reach the zero-clearance transmission.Because mechanism is all the time among the zero-clearance transmission, thus valve will be in time, opening and closing exactly.Guaranteed that cylinder intake is sufficient and exhaust is unimpeded, it is more approaching or reach the designing requirement of motor to make the reality of valve fold angle of release.It is more abundant that the raising of cylinder charge performance will make fuel combustion get, and the power of motor given full play to, and obtained good power character and Economy.Meanwhile, also just reduce exhaust pollution to a certain extent.

Below in conjunction with drawings and Examples the utility model is described.

Accompanying drawing is the utility model structural drawing.

(1) oil groove among the figure, (2) oilhole, (3) center hole, (4) aperture, (5) jump ring, (6) piston, (7) safety check steel ball, (8) check-valve spring, (9) safety check, (10) pistons work spring, (11) overcoat.

In order safety check (9), piston (6), pistons work spring (10) are packed in the overcoat (11) and jump ring (5) block fully firm, prevent that piston (6) from ejecting under the effect of pistons work spring (10); Push piston (6) downwards with valve actuating push rod, the air in piston (6) lower cavity is drained gradually, make the bottom be full of machine oil at last.

Pistons work spring (10) is pressed on the valve actuating push rod piston (6) during valve-closing, the tension force that the tension force of pistons work spring (10) far can not overcome valve spring is opened valve, keeps a kind of no gap state between valve stem, rocking arm, valve actuating push rod and the camshaft but make.

When tappet was directly moved upward by camshaft top, valve actuating push rod acted on reaction force on the piston (6) and tries hard to make piston (6) to overcome the elastic force of pistons work spring (10) and move downward with respect to overcoat (11).Because the engine oil pressure in piston (6) lower cavity raises rapidly, buttoned-up safety check (9) cuts out tighter, and the machine oil in the cavity is incompressible, and whole tappet such as same rigidity body rise overally, by push rod and rocking arm valve spring is compressed, valve is opened.When engine oil pressure is higher, have the matching gap seepage of a little machine oil between piston and overcoat and go out, but this does not influence the proper functioning of tappet.

When cam turns over tappet when bottom (this moment, the cam base circle part contacted with the tappet bottom), the suffered thrust of piston (6) suddenly disappears, and moves upward at the effect lower piston (6) of pistons work spring (10) and keeps in touch with valve actuating push rod all the time.Piston (6) is when moving upward, and piston (6) lower cavity volume increases, and certain degree of vacuum occurs.Safety check steel ball (7) overcomes the active force of check-valve spring (8) to be opened, and the machine oil on piston (6) top just flows into the cavity of piston (6) bottom by edge oil groove (1), oilhole (2), center hole (3) and safety check (9), make to be full of machine oil in the chamber all the time.

The machine oil on piston top is provided continuously by engine lubrication system.For preventing that fuel feeding is interrupted, the hollow sleeve that is provided with 6 oil resistances in addition specially is installed in motor, supplies with tappet work so that form oil oil.

Claims

The motor car engine tappet, tappet is a cylindrical body, 0.2 millimeter deep trouth is arranged on the cylindrical of overcoat, piston is equipped with in the inside of overcoat, it is characterized in that piston tip is semicircle ball-and-socket, there is a center hole at the center of piston, pass to the lower end from piston tip ball-and-socket bottom, the lower end is a safety check, under the safety check steel ball check-valve spring is arranged, and the check valve body top has the symmetrical aperture of 2.5 millimeters of two disconnected diameters, safety check tips upside down in the bottom, piston lower end, the pistons work spring is arranged under the safety check, and a jump ring groove is arranged at the top of overcoat, and jump ring is housed in the groove, the piston middle and upper part has a horizontal oilhole to pass through to center hole, the edge of piston has vertical vertical oil groove, and oil groove one end links to each other with horizontal oilhole, and the other end passes to piston tip.