CN2189646Y - Double-cylinder type hydraulic tappet in distributting mechanism of internal-combustion engine - Google Patents

Abstract

The utility model discloses a double-cylinder type hydraulic tappet in the distributing mechanism of an internal-combustion engine. The inner part of a tappet body (18) is provided with a piston (6) with an inner cavity; the inner part of the inner cavity of the piston (6) is provided with a small piston cylinder (5), wherein, the inner part of the small piston cylinder (5) is provided with a small piston (15); the top of the piston (6) is provided with a push rod (1); the lower cavity (19) of the piston (6) is communicated with the lower cavity (20) of the small piston cylinder through a flow regulating valve (8); the upper cavity (21) of the small piston cylinder is communicated with the outer part of the tappet body through a one-way valve (3) and communicated with the inner cavity of the piston through a one-way valve (4); the inner cavity of the piston is communicated with a lower cavity (19) through a one-way valve (7); the end cover (11) of the piston (6) is provided with a pressure regulating valve (12). The utility model has the advantages of good versatility, fuel saving and stable quality of drainage, and the utility model can eliminate the noise of the distributing mechanism.

Description

Double-cylinder type hydraulic tappet in distributting mechanism of internal-combustion engine

The utility model relates to the hydraulic tappet of I. C engine distribution mechanism.

The hydraulic tappet of prior art plays positive role to the work of motor, but its complex structure, the requirement on machining accuracy height, cost an arm and a leg, and often only at a certain particular vehicle design, also need special oil duct and from its hole, be communicated with the machine oil oil duct, be difficult to extensive use, particularly can not transform existing vehicle motor.

The purpose of this utility model is, design the two-cylinder type hydraulic tappet in a kind of I. C engine distribution mechanism, its versatility is good, can eliminate distribution device noise in the engine working process and because of adjusting the defective that the improper oil consumption increase that causes, discharge quality descend, simple in structure, reliable performance in the valve clearance.

The technical solution of the utility model is, described hydraulic tappet has the tubular lifter body of bottom sealing, be equipped with the band inner chamber in this lifter body piston is arranged, described piston head is to have the end cap of push rod and oil sealing is arranged at this piston bottom, its structural feature is, the stop rod that the return spring that makes the piston return and restricted piston maximum downstream position are arranged in the cavity of resorption that forms by piston lower surface and lifter body bottom surface in the lifter body, the snap ring of the maximum upward position of the restricted piston of the upper end-hole of lifter body, there is the small piston cylinder at the inner chamber middle part of piston, the small piston that the band oil sealing is arranged in this small piston cylinder, the following small piston cylinder cavity of resorption in described small piston lower end surface is communicated with the lifter body cavity of resorption through throttle valve, limit by small piston cylinder bottom face between the upper-end surface of small piston of its maximum downstream position and the end cap return spring that makes the small piston return and limit the maximum upward position of this small piston is arranged as small piston cylinder end face, the one-way valve of the above small piston epicoele in small piston upper-end surface through being installed on the end cap and opening to this epicoele is with the lifter body exterior, and small piston cylinder epicoele communicates with described piston cavity through the one-way valve that is installed on this small piston cylinder body and open to piston cavity, this piston cavity communicates with this lifter body cavity of resorption through the one-way valve that is installed on the piston and open to the lifter body cavity of resorption, on the described end cap pressure regulator valve is housed.

Explain below in conjunction with accompanying drawing.

Description of drawings: accompanying drawing is a sectional structure, in the drawings:

1--push rod 2--snap ring

3--one-way valve 4--one-way valve

5--small piston cylinder 6--piston

7--one-way valve 8--throttle valve

9--stop rod 10--return spring

11--end cap 12--pressure regulator valve

13--stop rod 14--return spring

15--small piston 16--oil sealing

17--oil sealing 18--lifter body

19--cavity of resorption 20--small piston cavity of resorption

21--small piston epicoele

By accompanying drawing as can be known, the utility model has the tubular lifter body (18) of bottom sealing, be equipped with the piston (6) of band inner chamber in this lifter body (18), described piston (6) top is the end cap (11) that has push rod (1) and oil sealing (17) is arranged at this piston (6) bottom, its design feature is, the stop rod (9) that the return spring (10) that makes piston (6) return and restricted piston (6) maximum downstream position are arranged in the cavity of resorption (19) that forms by piston (6) lower end surface and lifter body (18) bottom surface in the lifter body (18), the snap ring (2) of the maximum upward position of the restricted piston of upper end-hole (6) of lifter body (18); There is small piston cylinder (5) at piston (6) inner chamber middle part, the small piston (15) that band oil sealing (16) are arranged in this small piston cylinder (5), the following small piston cavity of resorption (20) in described small piston (15) lower end surface is communicated with through the cavity of resorption (19) of the same lifter body of throttle valve (8) (18), limit by small piston cylinder (5) bottom surface between the upper-end surface of small piston (15) of its maximum downstream position and the end cap (11) return spring (14) that makes small piston (15) return and limit the maximum upward position of this small piston (15) is arranged as small piston cylinder (5) end face, one-way valve (3) same lifter body (18) exterior of the above small piston epicoele (21) in small piston (15) upper-end surface through being installed in end cap (11) and going up and opening to this epicoele (21), and small piston cylinder epicoele (21) communicates with described piston cavity through the one-way valve (4) that is installed on this small piston cylinder (5) cylinder body and open to piston (6) inner chamber, the one-way valve (7) of this piston cavity through being installed in piston (6) and going up and opening to lifter body cavity of resorption (19) communicates with the cavity of resorption (19) of this lifter body, and pressure regulator valve (12) is housed on the described end cap (11).One end can be set in small piston cylinder epicoele (21) be installed in stop rod (13) on the end cap (11), replace the position-limiting action of return spring (14) to small piston (15) by the maximum upward position of this stop rod (13) restriction small piston (15), return spring (14) only works to make small piston (15) return in this case.This design is just much lower to the requirement of described return spring (14).

Design principle of the present utility model is, during engine operation, when lifter body (18) is elected upwards, push rod (1) acts on the relative lifter body of active force (18) that the active force of the end cap (11) of piston (6) makes piston (6) overcome return spring (10) and moves down, so the interior oil pressure of cavity of resorption (19) raises, oil promote through the throttle orifice of throttle valve (8) that small piston (15) compresses its return spring (14) and relatively small piston cylinder (5) move upward, till its maximum upward position, at this moment one-way valve (7) already pressurized close, oil in the cavity of resorption (19) does not have the place to go again, because the incompressible characteristic of liquid, whole lifter body rises as same rigid body.When the distribution device expanded by heating, piston (6) is subjected to the downward relative lifter body of active force (18) of push rod (1) and moves downward, and the effect that the oil in the cavity of resorption (19) is subjected to piston (6) moves upward by the relative small piston cylinder (5) of throttle valve (8) promotion small piston (15).The maximum swelling value of distribution device (being the volume that the descending range of piston (6) is occupied) equals the volume that the up range of small piston (15) is abdicated, so, after engine thermal is got up, when the distribution device expanded by heating arrives maximum value, piston (6) goes downwards to extreme lower position, small piston (15) also has been up to the extreme higher position, this moment is when lifter body (18) when working once more, piston (6) since small piston (15) by stop, can not move upward again abdicate the space and relatively lifter body (18) no longer produce relative movement, but rise together in company with lifter body (18), promote push rod (1) and open valve.If the oil sealing (17) of two-piston (6) (15), (16) leakage of oil will have influence on the opening travel of valve.After the described oil sealing leakage of oil, oil in the cavity of resorption (19) will reduce, the effect that small piston (15) is subjected to return spring (14) moves down, when lifter body (18) when task moves upward again, the effect that small piston (15) is subjected to oil in the cavity of resorption (19) moves upward again, compress the oil in the small piston cylinder epicoele (21) simultaneously, the oil of the interior pressurized in this chamber (21) flows into piston (6) inner chamber by one-way valve (4): when tappet is got back to the inoperative position again after finishing described work, cavity of resorption (19) is gone out and is formed partial vacuum owing to some oil leakage, one-way valve (7) is opened under the effect of the pressure effect of piston cavity oil and cavity of resorption (19) degree of vacuum, and the pressure oil of piston cavity is full of cavity of resorption (19) once more.The effect of pressure regulator valve (12) is a pressure of adjusting piston cavity.Just start at motor, the swell increment of distribution device also is provided with arrival, maximum value, or during described two-piston (6) (15) oil sealing leakage of oil, lifter body (18) promotes piston (6) when moving upward at every turn, after all must making small piston (15) only be up to earlier, piston (6) could rise together in company with lifter body (18), piston (6) just just promotes push rod (1) and rises than lifter body (18) a period of time that lags like this, and a period of time that lags under the nominal situation of valve during also with regard to the specific heat car just opens.The throttling action of throttle valve (8) is to reduce valve opening to lag during this period of time as far as possible, when lifter body (18) moves upward at a high speed, when cavity of resorption (19) oil pressure increases rapidly, because throttle valve (8) is gone up the effect of throttling pore, one time of oil of cavity of resorption can't pass throttling pore small piston (15) is risen in company with lifter body (18) together with regard to promoting piston (6) when shifting top dead center onto, and small piston (15) has been that the process of valve opening has suffered when being shifted onto lifting position by the oil of cavity of resorption (19).The elastic force of the return spring of described piston (14), (10) is added up should be slightly littler at the elastic force under the working condition not than valve spring, and the pressure of oil should be littler than small piston (15) pressure of its return spring bottom the time in the piston cavity.

As known from the above, the utility model is the two-cylinder type hydraulic tappet in the I. C engine distribution mechanism, can eliminate distribution device noise in the engine working process and because of adjusting the defective that the improper oil consumption increase that causes, discharge quality descend in the valve clearance, can reequip existing motor, and simple in structure, cost is low, reliable performance, versatility is good.

Embodiment, hydraulic tappet according to accompanying drawing and said structure, be configured on 6135 diesel engine or 4920 petrol engines, lifter body (18) is φ 40 * 75, the outside dimensions of piston (6) is respectively φ 32 * 26 and φ 32 * 26 with inner cavity size respectively, and the stroke of piston (6) and small piston (15) is respectively 0.5 and 0.75 millimeter.

Claims (2)

1, two-cylinder type hydraulic tappet in a kind of I. C engine distribution mechanism, the tubular lifter body (18) that the bottom sealing is arranged, there is the band inner chamber that piston (6) is arranged in this lifter body (13), described piston (6) top is the end cap (11) that has push rod (1) and there is oil sealing (17) its underpart, its design feature is, the stop rod (9) that the return spring (10) that makes piston (6) return and restricted piston (6) maximum downstream position are arranged in the cavity of resorption (19) that forms by piston lower surface and lifter body (18) bottom surface in the lifter body (18), the snap ring (2) of the maximum upward position of the restricted piston of upper end-hole (6) of lifter body (18), there is small piston cylinder (5) at the inner chamber middle part of piston (6), the small piston (15) that band oil sealing (16) are arranged in this small piston cylinder (5), the following small piston cylinder cavity of resorption (20) in described small piston (15) lower end surface is communicated with through the same lifter body of throttle valve (8) (18) cavity of resorption (19), limit by small piston cylinder (5) bottom surface between the upper-end surface of small piston (15) of its maximum downstream position and the end cap (11) return spring (14) that makes small piston (15) return and limit the maximum upward position of this small piston (15) is arranged as small piston cylinder (5) end face, one-way valve (3) same lifter body (18) exterior of the above small piston epicoele (21) in small piston (15) upper-end surface through being installed in end cap (11) and going up and opening to this epicoele (21), and small piston cylinder epicoele (21) communicates with described piston cavity through the one-way valve (4) that is installed on this small piston cylinder (5) cylinder body and open to piston (6) inner chamber, this piston cavity communicates through being installed in piston (6) the same cavity of resorption of one-way valve (7) (19) last and that open to lifter body cavity of resorption (19), and pressure regulator valve (12) is housed on the described end cap (11).

2, hydraulic tappet according to claim 1, it is characterized in that the stop rod (11) that is provided with in small piston epicoele (21) that an end is installed in that end cap (11) is gone up and limits in the face of the maximum downstream position of small piston (15) by its position-limiting action that replaces return spring (14).

Images