CN209444384U - Full floating roller tappet - Google Patents

Abstract

The utility model discloses a kind of full floating roller tappets, including tappet body and the roll wheel assembly being installed in tappet body bottom roller slot；The cell wall of roller groove is provided with pin shaft hole, and cell wall oil groove, the internal galleries for being internally provided with connection tappet intracoelomic cavity and roller groove of tappet body are provided on the inside of the cell wall of roller groove；Roll wheel assembly includes being provided with axial limit structure with the pin shaft, the guide that is sheathed on outside pin shaft and the idler wheel being sheathed on outside guide, the both ends of the surface of idler wheel of pin shaft hole interference installation, between pin shaft and guide, between guide and idler wheel be to be slidably matched；Pin shaft uses low-alloy steel material, and guide uses powder metallurgy material；The full floating roller tappet of the utility model improves the secondary greasy property of roller-coaster friction, improves tappet service life, improve engine reliability；And the manufacturing cost of roller tappet is reduced, the feature of environmental protection is good.

Description

Full floating roller tappet

Technical field

The utility model relates to engine component technical fields, and in particular to a kind of full floating roller tappet.

Background technique

Tappet is the important composition component in engine valve actuating mechanism, and driven member of the tappet as cam bears camshaft The lateral force applied when rotation, effect is that the thrust of cam is passed to push rod or valve stem.Tappet is divided into common tappet And hydraulic tappet, common tappet are divided into flat tappet and roller tappet.It wherein, is rolling friction between roller tappet and cam, The more flat tappet of bearing capacity is high, is conducive to reduce tappet, cam wear, and application on the engine is further extensive.

Existing roller tappet includes tappet body, idler wheel and pin shaft, and idler wheel is installed in the roller groove of tappet body bottom, pin It is interference fit between axis and tappet body, idler wheel is rotated around pin shaft and its cylinder and cam contact, tappet intracoelomic cavity are equipped with back Oilhole falls cylinder cap oil return by oil return hole, to the sliding friction pair of cam and idler wheel contact surface and idler wheel and pin shaft into Row lubrication.The roller tappet of the prior art has the disadvantage in that

(1) idler wheel is rotated around pin shaft, in axis direction without thrust, leads to idler wheel and tappet body bottom roller slot two sidewalls Distance differs larger, and then the splashing for influencing sliding pair two sides lubricating oil between idler wheel and pin shaft is uneven, under extreme case, lubrication Oil is fallen along side gap, and the friction pair is made to cannot get effectively lubricating, is eventually led to idler wheel and is unable to normal rotation, exacerbates Abrasion between idler wheel and cam and between idler wheel and pin shaft influences the service life of each component.

It (2) is mostly the materials such as bearing bronzes, brass or Pot metal for installing the pin shaft of idler wheel, although being good Antifriction material, but ordinary metallic material is more expensive than in price, and lead can be precipitated in Pot metal at high temperature, the feature of environmental protection is poor.

Summary of the invention

In view of this, improving rolling the technical problem to be solved by the utility model is to provide a kind of full floating roller tappet The greasy property of skidding dynamic friction pair improves tappet service life, improves engine reliability.

In order to solve the above technical problems, the technical solution of the utility model is: full floating roller tappet, the full floating rolling Taking turns tappet includes:

Tappet body, one end of the tappet body are provided with roller groove, and the cell wall of the roller groove is provided with and the idler wheel The pin shaft hole that slot is connected；

Roll wheel assembly, the roll wheel assembly include idler wheel and pin shaft, and the idler wheel is located in the roller groove and is arranged In outside the pin shaft, the pin shaft is installed on the pin shaft hole；

Guide is also arranged with outside the pin shaft, the guide positioned at the pin shaft and the idler wheel between, the pin shaft and Between the guide, between the guide and the idler wheel be to be slidably matched.

Since the full floating roller tappet of the utility model includes tappet body and the idler wheel that is installed in tappet body roller groove Component, roll wheel assembly include pin shaft, the guide being sheathed on pin shaft and the idler wheel being sheathed on guide, and pin shaft and guide it Between, between guide and idler wheel be to be slidably matched；Lubricating oil can enter between pin shaft and guide and between guide and idler wheel, Make pin shaft, guide, full floating connection formed by lubricating oil between idler wheel, good lubrication is carried out to each component, improves lubrication Performance, guarantees idler wheel normal rotation, and pin shaft along the circumferential direction even wearing improves tappet service life.

It is that many places of the utility model full floating roller tappet are further improved below:

Wherein, cell wall oil groove is provided on the inside of the cell wall of the roller groove.

Wherein, the cell wall oil groove run through the pin shaft hole inner end, the setting direction of the cell wall oil groove with it is described The axial direction of tappet body is consistent.It may insure that the lubricating oil in cell wall oil groove enters between pin shaft and guide, the two carried out good Lubrication.

Wherein, the internal galleries for being internally provided with connection tappet intracoelomic cavity and the roller groove of the tappet body.It comes from The lubricating oil of internal galleries corresponds to idler wheel and falls, and enters between idler wheel and guide and between guide and pin shaft from end, right Each component of roll wheel assembly carries out good lubrication；Also ensure the good lubrication between idler wheel cylindrical surface and cam.

Wherein, the both ends of the surface of the idler wheel are provided with the axial limit structure for limiting the idler wheel axial displacement.

Wherein, the axial limit structure is the positive stop lug boss of annular；Alternatively, the axial limit structure is interval setting Multiple limited blocks.The axial limit structure of idler wheel both ends of the surface, ensure that has certain side between idler wheel and roller groove two sidewalls The splashing of gap, two sides lubricating oil is uniform, so that sliding friction pair obtains effectively lubricating, optimizes the flow direction of lubricating oil, ensure that Idler wheel normal rotation.

Wherein, the pin shaft is equipped with annular groove, and the annular groove is equipped with the guide gear for limiting the guide axial movement Circle.

Wherein, it is provided with cell wall platform on the outside of the cell wall of the roller groove, the outboard end of the pin shaft hole is located at the slot Wall platform.Due to being provided with cell wall platform, the processing of pin shaft hole is facilitated.

Wherein, the pin shaft is the pin shaft of low-alloy steel material, and the guide is the guide of powder metallurgy material.Compared to With the pin shaft of the materials such as the bearing bronzes, brass or Pot metal of the prior art, the pin shaft price of low-alloy steel material is low, and The feature of environmental protection is good.

Wherein, the guide is the guide of ferrous based powder metallurgical material.So that guide has good self-lubrication.

In conclusion the full floating roller tappet of the utility model, improves the secondary greasy property of roller-coaster friction, mentions High tappet service life, improves engine reliability；And the manufacturing cost of roller tappet is reduced, the feature of environmental protection is good.

Detailed description of the invention

Fig. 1 is the full floating roller tappet structural decomposition diagram of the utility model embodiment；

Fig. 2 is the schematic cross-sectional view after Fig. 1 assembly (along pin shaft axial direction longitudinal section)；

Fig. 3 is another schematic cross-sectional view after Fig. 1 assembly (along pin shaft cross section)；

Fig. 4 is another schematic cross-sectional view after Fig. 1 assembly (along the section for deviateing pin shaft cross section)；

Fig. 5 is the tappet body structure schematic diagram (visual angle) in Fig. 1；

Fig. 6 is the tappet body structure schematic diagram (another visual angle) in Fig. 1；

Fig. 7 is the end view of Fig. 6；

In figure: 1- tappet body；11- roller groove；111- cell wall oil groove；12- pin shaft hole；13- tappet intracoelomic cavity；Inside 14- Oil duct；15- cell wall platform；2- pin shaft；21- annular groove；3- guide；4- idler wheel；41- positive stop lug boss；5- guide retaining ring.

Specific embodiment

Further details of non-limitative illustration is made to the utility model with reference to the accompanying drawings and examples.

Common shown as shown in Figure 1 to Figure 4, the full floating roller tappet of the utility model embodiment includes: tappet body 1 and installation Roll wheel assembly in the roller groove 11 of tappet body 1.

As Fig. 1, Fig. 5 to Fig. 7 jointly shown in, wherein the upper end of tappet body 1 be tappet intracoelomic cavity 13.The bottom of tappet body 1 It is provided with above-mentioned rollers slot 11, the cell wall of roller groove 11 is provided with the pin shaft hole 12 being connected with roller groove 11.In roller groove 11 Cell wall on the inside of be provided with cell wall oil groove 111, wherein preferred embodiment be cell wall oil groove 111 run through pin shaft hole 12 inner end, slot The setting direction of wall oil groove 111 is preferably axial consistent with tappet body 1.In being internally provided in connection tappet body for tappet body 1 The internal galleries 14 of chamber 13 and roller groove 11.Be provided with cell wall platform 15 on the outside of the cell wall of roller groove 11, pin shaft hole 12 it is outer Side is located at cell wall platform 15.

As shown in Figure 1, wherein roll wheel assembly includes pin shaft 2, the guide 3 for being sheathed on 2 outer circle of pin shaft and is sheathed on guide 3 The idler wheel 4 of outer circle, also, between pin shaft 2 and guide 3, between guide 3 and idler wheel 4 be to be slidably matched.3 axis are covered for banking pin To movement, it is equipped with annular groove 21 in pin shaft 2, annular groove 21 is equipped with guide retaining ring 5.

As depicted in figs. 1 and 2, wherein the both ends of the surface of idler wheel 4 are provided with the axial direction for limiting 4 axial displacement of idler wheel Position limiting structure.It is illustrated in figure, axial limit structure is the positive stop lug boss 41 of annular.Obviously, it is not limited to annular stop boss Form, axial limit structure can also use spaced multiple limited blocks form.

As Fig. 2 to Fig. 4 jointly shown in, wherein idler wheel 4 is located in roller groove 11, pin shaft 2 and pin shaft hole 12 interference fit pacify Dress.

Wherein, pin shaft 2 is the pin shaft of low-alloy steel material, and guide 3 is the guide of powder metallurgy material, it is preferred to use iron-based Powder metallurgy material.Compared to the pin shaft of the materials such as bearing bronzes, brass or Pot metal with the prior art, low-alloy steel product The pin shaft divalent lattice of matter are low, and the feature of environmental protection is good；The guide 3 of powder metallurgy material have good self-lubrication, be conducive to improve with Greasy property between pin shaft 2, idler wheel 4.

The full floating roller tappet of the utility model, since its roll wheel assembly includes forming full floating connection by lubricating oil Pin shaft 2, the guide 3 being sheathed on pin shaft 2 and the idler wheel 4 being sheathed on guide 3, the both ends of the surface of idler wheel 4 be provided with axial direction Position limiting structure improves roller-coaster friction lubricating performance, and each component can all obtain good lubrication, ensure that idler wheel 4 is normal Rotation, the along the circumferential direction even wearing of pin shaft 2, improves tappet service life, improves engine reliability；Pin shaft 2, guide 3 select reasonable material, reduce the manufacturing cost of roller tappet, and the feature of environmental protection is good.

Claims (10)

1. full floating roller tappet, the full floating roller tappet include:

Tappet body, one end of the tappet body are provided with roller groove, and the cell wall of the roller groove is provided with and the roller groove phase The pin shaft hole of connection；

Roll wheel assembly, the roll wheel assembly include idler wheel and pin shaft, and the idler wheel is located in the roller groove and is sheathed on institute It states outside pin shaft, the pin shaft is installed on the pin shaft hole；It is characterized in that,

Guide is also arranged with outside the pin shaft, the guide between the pin shaft and the idler wheel, the pin shaft with it is described Between guide, between the guide and the idler wheel be to be slidably matched.

2. full floating roller tappet as described in claim 1, which is characterized in that be provided with slot on the inside of the cell wall of the roller groove Wall oil groove.

3. full floating roller tappet as claimed in claim 2, which is characterized in that the cell wall oil groove is through the pin shaft hole Inner end, the setting direction of the cell wall oil groove are axial consistent with the tappet body.

4. full floating roller tappet as claimed in claim 2, which is characterized in that the connection that is internally provided with of the tappet body is endured The internal galleries of cylinder intracavity and the roller groove.

5. full floating roller tappet as described in claim 1, which is characterized in that the both ends of the surface of the idler wheel, which are provided with, to be used for Limit the axial limit structure of the idler wheel axial displacement.

6. full floating roller tappet as claimed in claim 5, which is characterized in that the axial limit structure is the limit of annular Boss；Alternatively, the axial limit structure is spaced multiple limited blocks.

7. full floating roller tappet as described in claim 1, which is characterized in that the pin shaft is equipped with annular groove, the annular groove peace Equipped with the guide retaining ring for limiting the guide axial movement.

8. full floating roller tappet as described in claim 1, which is characterized in that be provided with slot on the outside of the cell wall of the roller groove The outboard end of wall platform, the pin shaft hole is located at the cell wall platform.

9. full floating roller tappet as described in claim 1, which is characterized in that the pin shaft is the pin of low-alloy steel material Axis, the guide are the guide of powder metallurgy material.

10. full floating roller tappet as claimed in claim 9, which is characterized in that the guide is ferrous based powder metallurgical material Guide.