CN109751164A - Tappet for petrolift - Google Patents
Tappet for petrolift Download PDFInfo
- Publication number
- CN109751164A CN109751164A CN201811172016.5A CN201811172016A CN109751164A CN 109751164 A CN109751164 A CN 109751164A CN 201811172016 A CN201811172016 A CN 201811172016A CN 109751164 A CN109751164 A CN 109751164A
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- China
- Prior art keywords
- arm
- pin
- hole
- inner circumferential
- outer peripheral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/48—Assembling; Disassembling; Replacing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
- F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A kind of tappet for petrolift includes roller, and the rotary motion of cam is passed to roller；It sells (40), is inserted into the hollow portion of roller；First arm, an end (41) of retaining pin；Second arm (15), another end (42) of retaining pin.First arm has through-hole (16), and the second arm has through-hole (17), and the diameter of through-hole (17) is greater than the diameter of through-hole (16).One end of pin is press-fitted into the through-hole of the first arm to inhibit pin to surround the rotation of axial direction, and another end sold is connected to the displacement of the through-hole of the second arm in axial direction so as to adjustment pin.
Description
Technical field
The present invention relates to a kind of tappets for petrolift being arranged between cam and plunger.
Background technique
As shown in Patent Document 1, it is known that a kind of mechanical system including flange, pin and roller.The mechanical system has two
A flange.Each of the two flanges have hollow portion.Roller also has hollow portion.Roller is arranged between two flanges.
In the hollow portion of pin two flanges of insertion and roller.
The prior art:
Patent document 1: European patent No.2607636
Summary of the invention
In patent document 1 in disclosed mechanical system, the end sections of pin rivet and are fixed to flange.At the end of pin
In the case that portion part is riveted, quench to increase the rigidity of central part with needing the central part by making pin.Therefore, no
It may be using the manufacturing method for making all pin quenchings and multiple pins are inserted into together in furnace.This may will increase manufacture at
This.
During described riveting is fixed in patent document 1, the end sections plastic deformation of pin is so as to as it is along it
Itself axial direction expands its diameter far from center.Therefore, if it is fixed only by two end sections of pin by the riveting
In one be fixed to flange, then there is a possibility that pin may fall off.
Therefore, the disclosure described herein is intended to provide the tappet for petrolift, inhibit increased manufacturing cost and
Pin falls off.
According to an aspect of the present invention, the tappet being arranged between cam and plunger has cylindrical roller, cam
Rotary motion is passed to the cylindrical roller；Shaft-like pin is inserted into the hollow portion of roller；First arm, the end sections of pin
It is attached to first arm；Second arm, the other end part of pin are attached to second arm.Each of first arm and the second arm
With the through-hole for passing through pin.Through-hole of the diameter of the through-hole of first arm less than the second arm.The end portion partial pressure of pin
It is assigned in the through-hole of the first arm to limit the rotation for axially surrounding pin.The other end part of pin is connected to the second arm
Through-hole with the axial displacement of banking pin.
In this way, an end sections of pin are by being fixed with pressure to the first arm.According to the construction, riveted with passing through
The construction that pin is fixed to arm is different, does not need the incomplete quench to pin.Therefore, it is suppressed that the increase of manufacturing cost.
However, pin may be along contrary with press-fitting in the case where being press-fitted into arm by that will sell come fixed pin
Direction fallen from arm.Therefore, the other end of pin is connected to the second arm as described above.This construction can anti-shotpin fall from arm
It falls.
Detailed description of the invention
Fig. 1 is the partial cross section view for illustrating high pressure fuel pump；
Fig. 2 is amplified by the partial cross section view of the dotted line area encompassed A of Fig. 1；
Fig. 3 is the perspective view for illustrating the cross sectional shape of tappet；
Fig. 4 is the decomposition perspective view of tappet；
Fig. 5 is the cross-sectional view of the ontology in first embodiment；
Fig. 6 is to show the cross-sectional view for the state that pin is attached to ontology；
Fig. 7 is amplified by the partial cross section view of the dotted line area encompassed B of Fig. 6；
Fig. 8 is the cross-sectional view of the ontology in second embodiment；
Fig. 9 is to show the cross-sectional view for the state that pin is attached to ontology；
Figure 10 is amplified by the partial cross section view of the dotted line area encompassed C of Fig. 9；
Figure 11 is the cross-sectional view of the tappet of 3rd embodiment；And
Figure 12 is the cross-sectional view of the tappet in fourth embodiment.
Specific embodiment
Hereinafter, multiple embodiments will be described with reference to the drawings.
[first embodiment]
Illustrate the tappet for high pressure fuel pump in the present embodiment referring to Figure 1 to Figure 7.In addition, being omitted in Fig. 6
Roller 20 and bushing 30 to avoid explanation complication.
High pressure fuel pump 200 is constituted for high pressure fuel to be ejected into the supply of the fuel in the combustion chamber of internal combustion engine system
A part of system.Other than high pressure fuel pump 200, fuel system also have fuel tank, low-pressure fuel pump, common rail and
Fuel injection device.
Low-lift pump pumps out the fuel being stored in fuel tank.The fuel pumped out is supplied to high-pressure pump by low-lift pump
200.High-pressure pump 200 compresses the fuel supplied from low-lift pump and generates high pressure fuel.The high compression ignition that high-pressure pump 200 will compress
Material (high pressure fuel) is supplied to common rail.
Common rail stores the high pressure fuel supplied from high pressure fuel pump 200 and keeps pressure constant.Common rail is by high pressure fuel
It is assigned to each of multiple fuel injection devices.In fuel injection device will be ejected into from the high pressure fuel that common rail is supplied
In the combustion chamber of burn engine.
[schematic configuration of high-pressure pump]
As shown in Figure 1, high pressure fuel pump 200 have shell 110, cylinder body 120, plunger 130, Perfected electromagnetic metering valve 140 and
Check-valves 150.Shell 110 has the mounting hole 110a for cylinder 120 to be arranged.Cylinder body 120 has pump chamber 120a, plunger 130
It is arranged in pump chamber 120a.In addition, fuel feed passage is formed in cylinder body 120, the fuel stream supplied from low-pressure fuel pump
It is dynamic to pass through the fuel feed passage.Fuel feed passage is connected to pump chamber 120a.It is described below and is also disposed in mounting hole 110a
Tappet 100.
Plunger 130 has cylindrical shape.Plunger 130 is arranged in pump chamber 120a.In the axial direction around plunger 130
In circumferential direction, the sidewall surfaces of plunger 130 and the inner wall surface for constituting pump chamber 120a are in contact with each other throughout the circumferential.Plunger
130 are configured to slide in pump chamber 120a along its axial direction.
There are two openings for pump chamber 120a tool.An open end of the lower end portion of plunger 130 from pump chamber 120a are outside
It is prominent.The lower end portion of plunger 130 is located in mounting hole 110a.In on another open end side of pump chamber 120a
The upper end face of wall surface and plunger 130 is relative to each other.Plunger compartment is separated as a result,.Plunger compartment is another via pump chamber 120a's
One opening is connected to fuel feed passage.Hereinafter, another opening of pump chamber 120a is referred to as the opening of plunger compartment.
The valve body 141 of Perfected electromagnetic metering valve 140 is arranged in the opening of plunger compartment.Due to the helical of Perfected electromagnetic metering valve 140
The motive force in pipeline circle 142 magnetic field generated and spring (not shown), valve body 141 in axial direction move.As a result, plunger
Connection between room and fuel feed passage is controlled.
Tappet 100 is contacted with the end surface 130a of the lower end portion of plunger 130, and end surface 130a is projected into pump
The outside of room 120a.Tappet 100 is located at a part in the contact portion opposite side of plunger 130 with setting in camshaft
Cam 310 on 300 contacts.In this way, tappet 100 is inserted between plunger 130 and cam 310.
Camshaft 300 rotates together with the crankshaft of internal combustion engine.As a result, cam 310 also rotates.Cam 310, which has, to be enclosed
It is prominent from basic circle around the arcuation basic circle of the axial direction of camshaft 300, and along the direction of the axial direction perpendicular to camshaft 300
Cam nose out.As cam 310 rotates, tappet 100 sequentially contacts basic circle and cam nose respectively.Therefore, tappet 100
It is linearly moved back and forth in mounting hole 110a according to the rotary motion of cam 310.The reciprocating linear motion of tappet 100 is passed
It is delivered to plunger 130.As a result, plunger 130 is also linearly moved back and forth along its axial direction.
Retainer 131 with the shape along the Directional Extension orthogonal with the axial direction of plunger 130 is fixed to plunger 130
Lower end portion.The outer surface 120b of the upper surface 131a of retainer 131 and cylinder body 120 along plunger 130 axial direction that
This is opposite.Helical spring 132 is arranged between upper surface 131a and outer surface 120b.Helical spring 132 have make elastic component
Along the shape of the axial direction spiral winding of plunger 130.One end of helical spring 132 is contacted with upper surface 131a, and
The other end is contacted with outer surface 120b.
Therefore, when plunger 130 in axial direction moves, helical spring 132 expands between retainer 131 and cylinder body 120
Exhibition and contraction.As a result, the motive force of slave cylinder body 120 guidance to the retainer 131 of helical spring 132 acts on plunger 130.Spiral shell
The motive force of rotation spring 132 acts also on tappet 100.The motive force keeps the contact between plunger 130 and tappet 100 respectively
And the contact between tappet 100 and cam 310.
As described above, plunger 130 slides in pump chamber 120a with the rotation of the camshaft 300 of internal combustion engine.Knot
Fruit, the volume variation of plunger compartment.In other words, the fuel capacity variation in plunger compartment.
There is cylinder body 120 discharge orifice 120c to be used to high pressure fuel being discharged into common rail from plunger compartment.The setting of check-valves 150 exists
In discharge orifice 120c.Check-valves 150 has closure valve and closing spring.
Each of closure valve and closing spring are arranged inside discharge orifice 120c.It will by the motive force of closing spring
Closure valve is pressed into the communications ports of the plunger compartment side of discharge orifice 120c from the inside of discharge orifice 120c.As a result, plunger compartment and row
Connection between the inside of discharge hole 120c is blocked.
As described above, the connection between plunger compartment and fuel feed passage is controlled by Perfected electromagnetic metering valve 140.When plunger compartment
When volume is reduced by the movement of plunger 130, the connection between plunger compartment and fuel feed passage is hindered by Perfected electromagnetic metering valve 140
Plug.Which increase the pressure in plunger compartment.Fuel in plunger compartment is compressed into high pressure.Pass through the pressure increase, closure valve gram
It takes the thrust of closing spring and is separated with the communications ports of discharge orifice 120c.As a result, plunger compartment and the inside of discharge orifice 120c that
This connection.As a result, high pressure fuel is able to be supplied to common rail from high pressure fuel pump 200.
[schematic configuration of tappet]
Then, illustrate the schematic configuration of tappet 100.As shown in Figures 2 to 4, tappet 100 have ontology 10, roller 20,
Bushing 30 and pin 40.Pin 40 has cylindrical shape.Two end sections of pin 40 are supported by ontology 10.
Each of roller 20 and bushing 30 are all with cylinder shape.Pin 40 is inserted into the hollow portion of bushing 30.Lining
Set 30 and pin 40 are inserted into the hollow portion of roller 20.Each of roller 20 and bushing 30 can be rotated relative to pin 40.
Tappet 100 is arranged between cam 310 and plunger 130.310 contact roller 20 of cam.Plunger 130 contacts ontology
10.Roller 20 is rotated by the rotation of cam 310.Moreover, ontology 10 moves up and down together with roller 20.Ontology 10 erects
Straight movement also moves up and down plunger 130.That is, plunger 130 linearly moves back and forth.
[construction of tappet]
Next, tappet 100 is described in detail.Hereinafter, three orthogonal directions are expressed as X-direction, Y-direction
And Z-direction.The plane as defined by X-direction and Y-direction is shown as transverse plane.The plane as defined by Y-direction and Z-direction is shown
It is out perpendicular.Transverse plane is orthogonal to Z-direction.Perpendicular is orthogonal to X-direction.
As shown in Figures 2 to 4, ontology 10 has main part 11, the first support portion 12, the second support portion 13, the first arm 14
And second arm 15.Main part 11 has the shaft-like shape extended along Z-direction.Specifically, main part 11 has extends along Z-direction
Cylindrical shape.Main part 11 has the upper end face 11a and lower end surface 11b faced along Z-direction.Upper end face
Each of 11a and lower end surface 11b all have circular shape in transverse plane.
First support portion 12 is integrally attached to the upper end face 11a of main part 11.First support portion 12 along the Z direction from
The edge of upper end face 11a circlewise extends.As a result, the axis of the first support portion 12 is along the Z direction.
Second support portion 13 is integrally attached to the lower end surface 11b of main part 11.Second support portion 13 along the Z direction from
The edge of lower end surface 11b circlewise extends.As a result, the axis of the second support portion 13 is along the Z direction.
Main part 11, the first support portion 12 and the second support portion 13 are in transverse plane on the axial direction along Z-direction
Position it is consistent with each other.Therefore, corresponding axial direction is aligned along Z-direction.In Fig. 2, these axial directions are by the common table of dotted line
It is shown as vertical axis direction VAD.Vertical axis direction VAD is also consistent with the axial direction of plunger 130.
Main part 11, the first support portion 12 are identical with the overall diameter of the second support portion 13.Main part 11, the first support portion 12
It is continuously connected with the annular outer surface 11c in each of the second support portion 13 along Z-direction.Outer surface 11c is around vertical
Axis direction VAD along circumferential direction throughout the circumferential with constitute mounting hole 110a inside-wall surface contact.Main part 11, first
Each of support portion 12 and the second support portion 13 can slide in mounting hole 110a along vertical axis direction VAD.
Incidentally, the shape on the inner circumferential surface of the first support portion 12 and the second support portion 13 is different.First
The annular inner circumferential surface 12a of support part 12 forms circular shape.On the other hand, the interior of the annular shape of the second support portion 13 is formed
Peripheral surface 13a forms the rectangle with fillet.More specifically, the inner circumferential surface 13a of the second support portion 13 has in X direction
Both sides and along Y-direction both sides and formed have fillet square.
The interior diameter of first support portion 12 is greater than the longest diameter of the inside of the second support portion 13.Therefore, the second support portion
13 are being greater than the first support portion from the vertical axis direction VAD length (thickness) in the radial direction that transversely planar radial extends
12.As a result, the rigidity of the second support portion 13 is higher than the rigidity of the first support portion 12.The inner circumferential surface 13a of second support portion 13
It can have circular shape.
As shown in Fig. 2, in the end surface 130a and upper end face 11a that are located at the lower end portion of plunger 130
Entreat region contact.Then, on the direction along transverse plane, the lower surface 131b of retainer 131 be located at upper end face
Region (end regions) contact in the end side of the central area of 11a.The end side region of upper end face 11a is via holding
Device 131 and along an end part aligning of Z-direction and helical spring 132.One end of helical spring 132 and retainer 131
Upper surface 131a contact.As a result, retainer 131 is maintained at helical spring 132 and main part by the motive force of helical spring 132
Between 11.
Each of lower end portion, retainer 131 and end for helical spring 132 of plunger 130 are respectively positioned on
In the region surrounded by the annular inner circumferential surface 12a of the first support portion 12.The end sections and helical spring of retainer 131
132 side section is contacted with the inner circumferential surface 12a of the first support portion 12.As a result, preventing in helical spring 132 and plunger 130
Each from main part 11 be detached from.
As shown in Fig. 2, end surface 11b's a part of roller 20 is separated from each other along Z-direction simultaneously downwards.Roller 20
It is located at the region surrounded by the annular inner circumferential surface 13a of the second support portion 13 with a part of each of bushing 30
In.
As described above, each of roller 20 and bushing 30 can be rotated relative to pin 40.For this purpose, being produced at rotating part
Raw frictional heat.And multiple through-hole 11d are formed in main part 11 and the second support portion 13, inhibit friction to be thermally generated so that being used as
The fuel of lubricating oil above-mentioned rotating part is applied to by through-hole 11d.
The upper end face 11a and lower end surface 11b of a connection main part 11 in through-hole 11d.Through-hole 11d is upper
Intermediate region split shed between the central area and end side region of end surface 11a.Through-hole 11d is configured to along the Z direction.
Therefore, through-hole 11d is opened in the view field in the 11b of lower end surface in the intermediate region of upper end face 11a along Z-direction
Mouthful.Along the Z direction towards roller 20, which is positioned at by second opening of the through-hole 11d on the side 11b of lower end surface
In the region that the inner circumferential surface 13a of support part 13 is surrounded.It is located in as a result, being applied to fuel by through-hole 11d by second
The roller 20 and bushing 30 in region that the inner circumferential surface 13a of support portion 13 is surrounded.
Another through-hole 11d passes through the outer surface 11c of main part 11 and the inner circumferential surface 13a of the second support portion 13.
Through-hole 11d is along relative to the inclined inclined direction of Z-direction.Opening of the through-hole 11d on the side interior peripheral surface 13a is along inclination side
To relatively, which is positioned in the region surrounded by the inner circumferential surface 13a of the second support portion 13 with roller 20.Knot
Fuel is also exerted to roller 20 and bushing in the region surrounded by inner circumferential surface 13a by through-hole 11d by fruit
30。
Each of first arm 14 and the second arm 15 are integrally attached to the second support portion 13.First arm 14 and the second arm 15
Each of extend each along Z-direction from the second support portion 13.First arm 14 and the second arm 15 have writing board shape, wherein maximum
Area main surface is along perpendicular.
The length of each of first arm 14 and the second arm 15 in the Y direction is supported equal to or less than main part 11, first
Overall diameter in each of portion 12 and the second support portion 13.Each of first arm 14 and the second arm 15 are being orthogonal to main surface
Length (thickness) in X-direction and the thickness of above-mentioned second support portion 13 are essentially identical.
First arm 14 and the second arm 15 are arranged side by side at certain intervals in X direction.The interior main surface 14a of first arm 14 and
The interior main surface 15a of two arms 15 is relative to each other in X direction.Distance between interior main surface 14a and interior main surface 15a in X direction
Equal to the interior diameter of the second support portion 13.Along X between the outer main surface 14b of first arm 14 and the outer main surface 15b of the second arm 15
The distance in direction is equal to or less than the overall diameter of the second support portion 13.As described above, the first arm 14 and the second arm 15 can bases
The vertical shift of tappet 100 and be movable into and out mounting hole 110a.In the accompanying drawings, between outer main surface 14b and outer main surface 15b
Separating distance in X direction is shown as being narrower than the overall diameter of the second support portion 13.
The first through hole 16 for penetrating interior main surface 14a and outer main surface 14b in X direction is formed in the first arm 14.It is similar
Ground, the second through-hole 17 for penetrating interior main surface 15a and outer main surface 15b in X direction are formed in the second arm 15.
Each of first through hole 16 and the second through-hole 17 are circular along the shape of perpendicular.In the present embodiment,
In the axial direction extended along the X-direction of first through hole 16 and along the axial direction of the X-direction extension of the second through-hole 17, accordingly
The position consistency that axial direction intersects with perpendicular.Therefore, the position of corresponding axial direction is aligned in X direction.In Fig. 2,
These positions are collectively denoted as horizontal axis direction HAD by single dotted broken line.Horizontal axis direction HAD also respectively with bushing 30, rolling
Son 20 is consistent with the axial direction of pin 40.
Each of bushing 30 and roller 20 all have the cylindrical form being open in X direction.Pin 40 has to be extended in X direction
Axial shape.More specifically, pin 40 has the cylindrical shape extended in X direction.
Pin 40 has the first end surface 40a and the second end surface 40b in face of X-direction.First end surface 40a and
Each of the second end surface 40b has circular shape in transverse plane.As shown in Figures 3 and 4, pin 40 is formed with hollow
Portion, the hollow portion is in direction X through first end surface 40a and the second end surface 40b.Therefore, the pin 40 of the present embodiment has
There is the cylindrical form being open in X direction.
The interior diameter of bushing 30 is greater than the overall diameter of pin 40.The interior diameter of roller 20 is greater than the overall diameter of bushing 30.Therefore,
Pin 40 can be inserted in the hollow portion of bushing 30.Each of bushing 30 and pin 40 can be inserted in the hollow portion of roller 20.
By the way that bushing 30 to be inserted into pin 40, around horizontal axis direction HAD along circumferential direction annularly around pin 40
The inner surface 30a of outer peripheral surface 40c and bushing 30 is facing with each other along the direction perpendicular to horizontal axis direction HAD.Passing through will
Roller 20 is inserted into bushing 30, and the outer surface 30b of bushing 30 and the edge inner surface 20a of roller 20 are orthogonal to horizontal axis side
It is facing with each other to the direction of HAD.Outer peripheral surface 40c corresponds to outer peripheral surface.
It is closely-spaced to be respectively formed between pin 40 and bushing 30 and between bushing 30 and roller 20.Small―gap suture filling is useful
Make the fuel of lubricating oil.Therefore, roller 20 can smoothly be rotated relative to bushing 30.Bushing 30 can be respectively relative to roller
20 and pin 40 smoothly rotate.
The length of pin 40 in the X direction is longer than each of bushing 30 and roller 20.Bushing 30 and roller 20 are in X-direction
Upper length having the same.More specifically, between the first end surface 40a of pin 40 and the second end surface 40b in the X direction
Length is substantially equal to the length between the outer main surface 14b of the first arm 14 and the outer main surface 15b of the second arm 15 in the X direction
Degree.The length of bushing 30 and roller 20 in the X direction be substantially equal to the first arm 14 interior main surface 14a and the second arm 15 it is interior
Distance between main surface 15a in the X direction.In other words, the length of bushing 30 and roller 20 in the X direction is substantially equal to
The interior diameter of second support portion 13.
The center of each insertion pin 40 in bushing 30 and roller 20.As a result, pin 40 is on the side 40a of first end surface
The end sections of end sections and pin 40 on the side 40b of the second end surface are exposed to outside from bushing 30 and roller 20 respectively.
In the following description, respectively from the end portion on the side of first end surface 40a of bushing 30 and the exposure of roller 20
Divide referred to as first end part 41 and the end sections being located on the side 40b of the second end surface are referred to as the second end part
42。
The first end part 41 of pin 40 is arranged in the first through hole 16 of the first arm 14.The second end part 42 of pin 40
It is arranged in the second through-hole 17 of the second arm 15.As a result, a part of bushing 30 and roller 20 is arranged in the second support portion 13.
The end surface of bushing 30 and roller 20 respectively slidably contacts the interior main surface 14a of the first arm 14 and the interior master of the second arm 15
Surface 15a.
[fixed form of pin]
Next, will be described in the fixed form of pin the 40 to the first arm 14 and the second arm 15.Hereinafter, first through hole
The half of 16 interior diameter is expressed as the first inside radius L1.And the half of the interior diameter of the second through-hole 17 is expressed as half in second
Diameter L2.
As shown in figure 5, the first inside radius L1 of the first through hole 16 of the first arm 14 is shorter than the second through-hole 17 of the second arm 15
The second inside radius L2.As shown in Figure 6 and Figure 7, the interior diameter of the second through-hole 17 is slightly larger than the overall diameter of pin 40.In Fig. 7, the
Boundary between two support portions 13 and the second arm 15 is represented by the dotted line.
The reason different with the interior diameter of the second through-hole 17 of first through hole 16 is to be press-fitted pin 40 and be fixed on first through hole
In 16.The overall diameter of the smaller pin 40 of the interior diameter of first through hole 16 allows to pin 40 by being pressed into first through hole 16.Second
The interior diameter of through-hole 17 slides pin 40 relative to the second through-hole 17 slightly larger than the overall diameter of pin 40.
Before pin 40 is press-fitted into first through hole 16, bushing 30 and roller 20 are set in advance in 14 He of the first arm respectively
Between second arm 15.The first end part 41 of pin 40 passes through the hollow of bushing 30 and roller 20 after passing through the second through-hole 17
Portion.Hereafter, the first end part 41 of pin 40 is press-fitted into first through hole 16.As a result, the first end part 41 of pin 40 is set
It sets in first through hole 16 and the second end part 42 is arranged in the second through-hole 17.
When first end part 41 is press-fitted into first through hole 16, a part of plasticity shape of first end part 41
Become.The outer peripheral surface 40c of first end part 41 and limit the annular surface 16a of first through hole 16 around it is entire it is circumferential that
This contact.As a result, the first end part 41 of pin 40 is press-fitted and is fixed to the first arm 14.It inhibits to make pin 40 around trunnion axis
Line direction HAD rotation.
Moreover, as shown in Figure 2 and Figure 4, tappet 100 has the snap ring 50 for pin 40 to be connected to the second arm 15.Snap ring
50 have the shape extended along circumferential direction around horizontal axis direction HAD.More specifically, as shown in figure 4, snap ring 50 is in tool
There is the annular in gap.As a result, 50 elastically deformable of snap ring is thus towards its central reduction.Snap ring 50 corresponds to adjustment means.
As shown in Fig. 2, being formed with for keeping snap ring 50 on the outer peripheral surface 40c of the second end part 42
One concave part 43.First concave part 43 is annularly formed along circumferential direction around horizontal axis direction HAD.
Similarly, the second concave part 18 for keeping snap ring 50 is also formed in the second through-hole 17 for limiting the second arm 15
On annular surface 17a.Second concave part 18 is around horizontal axis direction HAD in circumferential direction along annular surface 17a
Shape circlewise formed.Annular surface 17a corresponds to inner circumferential surface.
Each of first concave part 43 and the second concave part 18 are radial from horizontal axis direction HAD along perpendicular
What is extended has different length (depth) in the radial direction.As shown in fig. 7, the first depth L3 of the first concave part 43 is deeper than
Second depth L4 of two concave parts 18.First depth L3 is substantially equal to the diameter L for constituting the linear segment of circumferential clasp 50.The
Two depth L4 are shorter than the diameter L of the linear segment of snap ring 50.The length (the first width) and second of first concave part 43 in X direction
The length (the second width) of concave part 18 in X direction is respectively set as roughly the same with the diameter L of the linear segment of snap ring 50.
As described above, pin 40 is press-fitted into first through hole 16 by the second through-hole 17.It is interior before the press-fitting of circumferential clasp 50
Diameter is roughly the same with the overall diameter of pin 40.Before press-fitting, snap ring 50 is arranged in the first concave part 43.It is pressed by pin 40
During being fitted in first through hole 16, snap ring 50 is in the wall surface 43a and the second through-hole 17 for constituting the first concave part 43
It is compressed between annular surface 17a.Then, when completing for pin 40 to be press-fitted into first through hole 16 and the first concave part 43 and the
When two concave parts 18 are arranged to facing with each other as illustrated in fig. 7, for keeping the memory space of snap ring 50 to be formed by two grooves.
Memory space is equal to the in the length in the radial direction radially extended from horizontal axis direction HAD along perpendicular
The summation of one depth L3 and the second depth L4.The summation of first depth L3 and the second depth L4 are longer than the linear segment of snap ring 50
Diameter L.For this purpose, pin 40 is press-fitted into first through hole 16 and is accomplished and memory space is formed, so that snap ring 50 attempts
Restore its original-shape in memory space.As a result, at least part of snap ring 50 is from the first concave part 43 towards the second concave part
18 displacements.As a result, snap ring 50 contacts the wall surface 43a for constituting the first concave part 43 respectively and constitutes the wall of the second concave part 18
Surface 18a.
As described above, the line of each of the first concave part 43 and the second concave part 18 length in X direction and snap ring 50
The diameter L of property part is roughly the same.Therefore, snap ring 50 is located at a part and snap ring 50 on the side of the first arm 14 in X direction
Part in the opposite side of the first arm 14 is contacted with the wall surface of corresponding recesses part.In other words, along the X direction and
In two septal directions far from snap ring 50, snap ring 50 and the wall surface contact for limiting each groove.As a result, pin 40 is along the side X
To displacement be restricted.That is, it is suppressed that pin 40 is fallen from arm.
[function and effect]
Next, by description according to the function and effect of the tappet 100 of the present embodiment.As described above, the first end of pin 40
Portion part 41 passes through the first through hole 16 being fixed with pressure to the first arm 14.According to the construction, pin is fixed to arm with by riveting
Construction it is different, the incomplete quench of pin is non-essential.Which suppress the increases of manufacturing cost.
In addition, the second end part 42 of pin 40 is connected to the second through-hole 17 of the second arm 15 by snap ring 50.As a result, pin
40 displacement in X direction is restricted.Therefore, it is suppressed that pin 40 is fallen from arm.
[second embodiment]
Next, second embodiment will be described with reference to Fig. 8 to Figure 10.According to the tappet of the embodiments described below with it is above-mentioned
The tappet of embodiment has many something in commons.For this purpose, below by omission to the explanation of common ground, and will focus on difference
Part.In the following description, identical appended drawing reference is assigned to element identical with element shown in above-described embodiment.
In the first embodiment, position that the axial direction that first through hole 16 extends in X direction intersects with perpendicular and
The position consistency that the axial direction that second through-hole 17 extends in X direction intersects with perpendicular.In Fig. 2, Fig. 5 and Fig. 6, these
Position is collectively denoted as horizontal axis direction HAD by single dotted broken line.Horizontal axis direction HAD also respectively with bushing 30, roller 20
It is consistent with the axial direction of pin 40.
On the other hand, in the present embodiment, what the axial direction that first through hole 16 extends in X direction intersected with perpendicular
The position that the axial direction that position and the second through-hole 17 extend in X direction intersects with perpendicular is offset from one another.In Fig. 8 and Fig. 9
In, the axial direction of first through hole 16 is expressed as first level axis direction HAD1 by single dotted broken line.Also, the second through-hole 17
Axial direction is expressed as the second horizontal axis direction HAD2 by double dot dash line.
As clearly shown in Figure 8, the second horizontal axis direction HAD2 is more farther than first level axis direction HAD1 in z-direction
From main part 11.In other words, the second horizontal axis direction HAD2 in z-direction than first level axis direction HAD1 closer to
310 side of cam.
Constituting position of the annular surface 16a of first through hole 16 in a part of main part 11 in z-direction
It sets and is constituting position of the annular surface 17a of the second through-hole 17 in a part of main part 11 in z-direction
Unanimously.In other words, annular surface 16a is farthest away from the position of cam 310 and annular surface 17a farthest away from cam 310
Position is aligned in z-direction.In other words, annular surface 16a near the position of plunger 130 and annular surface 17a most
Position close to plunger 130 is consistent with each other in z-direction.
Therefore, farthest part of the annular surface 17a away from main part 11 is in z-direction than annular surface 16a away from main body
The farthest part in portion 11 is closer to 310 side of cam.In other words, annular surface 17a is near the part of cam 310 in the side Z
Upwards than annular surface 16a near the part of cam 310 closer to cam 310.In other words, annular surface 17a away from
The farthest part of plunger 130 is in z-direction than annular surface 16a away from the farthest partially closer to 310 side of cam of plunger 130.
As described above, pin 40 is press-fitted into first through hole 16.Therefore, the axial direction of pin 40, bushing 30 and roller 20
Respectively along first level axis direction HAD1.
According to above-mentioned construction, in the second through-hole 17, part and pin 40 of the annular surface 17a on 130 side of plunger
Between along Z-direction separating distance be less than annular surface 17a the part on 310 side of cam and between pin 40 along Z-direction
Separating distance.Specifically, as shown in figure 9, annular surface 17a near the part of plunger 130 most than annular surface 17a
Part close to cam 310 is closer to pin 40.As shown in Figure 10, pin 40 is substantially with annular surface 17a near plunger 130
Part contact.
[function and effect]
As described above, 310 contact roller 20 of cam.By the contact, make roller 20 from cam 310 towards 130 side of plunger into
Row pressing.As a result, the center for being provided with the pin 40 of roller 20 is also pressed from cam 310 towards 130 side of plunger.Hereinafter,
The power that cam 310 acts on pin 40 is expressed as pressing force.
The upper end face of the main part 11 of ontology 10 is arranged in via retainer 131 for one end of helical spring 132
On 11a.Therefore, helical spring 132 is applied to ontology 10 from the motive force that plunger 130 is directed to 310 side of cam.Helical spring
132 motive force acts on the press-fitting of pin 40 and is fixed on the first end part 41 of the first arm 14.
As described above, acting on the center of pin 40 from cam 310 towards the pressing force that plunger 130 is oriented to.From plunger 130 towards convex
The motive force of 310 guiding of wheel acts on the first end part 41 of pin 40.Therefore, pin 40 the second end part 42 be easy from
Cam 310 is displaced to 130 side of plunger.
On the other hand, as described above, the second horizontal axis direction HAD2 is positioned to along Z-direction than first level axis direction
HAD1 is closer to 310 side of cam.The annular surface 16 of composition first through hole 16 is in a part of plunger 130a in the side Z
Position of the annular surface 17a of upward the second through-hole 17 of position and composition in a part of plunger 130 in z-direction
It sets consistent with each other.As a result, the part for being positioned closest to plunger 130 of annular surface 17a is substantially contacted with pin 40.
Therefore, different from the construction that the part in the annular surface of the second through-hole near plunger is separated with pin, this suppression
It is moved by pressing force and motive force along Z-direction the second end part 42 for having made pin 40.This prevent the rotation of cam 310 fortune
It is dynamic to be difficult to smoothly be transmitted to plunger 130 via tappet 100.
It incidentally, include structure identical with tappet 100 described in first embodiment according to the tappet of the present embodiment 100
At element.Thus, it is possible to obtain identical function and effect.
[3rd embodiment]
Next, will be described with reference to FIG. 11 3rd embodiment.
In the first embodiment, it is shown in which at least part of first end part 41 by by first end part
41 are press-fitted into first through hole 16 and the example of plastic deformation.On the contrary, in the present embodiment, press-fitting component 60 is press-fitted into first
In the first end surface 40a of end sections 41, thus make 41 plastic deformation of first end part.
The hollow portion for penetrating first end surface 40a and the second end surface 40b in X direction is formed in pin 40.It will
The press-fitting component 60 that diameter is greater than opening diameter is press-fitted into the opening in hollow portion on the side of first end surface 40a
In.As a result, 41 plastic deformation of first end part is so that along horizontal axis side is orthogonal to as shown in the hollow arrow in Figure 11
It broadens to the length of the radial direction of HAD.As a result, first end part 41 outer peripheral surface 40c and first through hole 16 it is interior
Annular surface 16a is circumferentially in contact with each other around entire.Although being not shown, such as press-fitting component 60 can be press-fitted into second
In the first end surface 40a of end sections 42.
It is self-evident, function identical with tappet 100 described in first embodiment is played according to the tappet 100 of the present embodiment
Energy and effect.
[fourth embodiment]
Next, fourth embodiment will be described with reference to Figure 12.
In the first embodiment, the first depth L3 of the first concave part 43 with constitute circumferential clasp 50 linear segment it is straight
Diameter L is roughly the same.On the other hand, in the present embodiment, the first depth L3 diameter group L of the first concave part 43 is short.First groove
It is equal to or less than diameter L along the distance of Z-direction between portion 43 and the outer peripheral surface 40c of the second end part 42.
Due to above-mentioned length relation, before pin 40 is press-fitted into first through hole 16, a part of snap ring 50 is from first
Groove 43 is prominent.It is equal to or more than the annular surface 17a and second of the second through-hole 17 from the length of the part outstanding of snap ring 50
Along the separating distance of Z-direction between the outer peripheral surface 40c of end sections 42.
Therefore, during pin 40 is press-fitted into first through hole 16, snap ring 50, which is inserted in, constitutes the first concave part 43
Wall surface 43a and separate the second through-hole 17 annular surface 17a between.As a result, at least part of pin 40 is according to first
The shape of groove 43 and plastic deformation.
Hereafter, when pin 40 is press-fitted into first through hole 16 and by the first concave part 43 and the second concave part 18 by completion
When being oppositely arranged to form the memory space for keeping snap ring 50, snap ring 50 be arranged in memory space.According to the first groove
The snap ring 50 of 43 shape and plastic deformation is contacted with Z-direction with the wall surface for limiting (forming) each concave part in X direction.Card
At least part of contact between ring 50 and the wall surface of concave part surrounds horizontal axis direction HAD continuously in the circumferential direction.
For this purpose, effectively limiting the displacement of pin 40 in the X direction.First depth L3 of the first concave part 43 and the second concave part 18
The summation of second depth L4 is about diameter L.
Although preferred embodiment of the present disclosure is described above, the disclosure is not in any way limited to above-mentioned reality
Example is applied, and various modifications can be carried out without departing from the spirit of the present disclosure.
[other modifications]
In each of embodiment, the second end part 42 of pin 40 by snap ring 50 be connected to the second arm 15 it is second logical
Hole 17.However, not advised for example, can be formed on the annular surface 17a of the second through-hole 17 of the second end part 42 and composition
Then portion, to be fitted to each other and to connect.
Claims (10)
1. a kind of tappet for petrolift is arranged between cam (310) and plunger (130), comprising:
Roller (20), with tubular form, the rotary motion of the cam is passed to the roller；
It sells (40), with axis shape shape and is inserted into the hollow portion of the roller；
First arm (14) is configured to keep an end (41) of the pin；And
Second arm (15) is configured to keep another end (42) of the pin, wherein
Each of first arm and second arm have through-hole (16,17), and the pin passes through the through-hole,
The diameter of the through-hole (16) of first arm is less than the diameter of the through-hole (17) of second arm,
One end of the pin is press-fitted into the through-hole of first arm to inhibit the pin around axial direction
Rotation, and
Another described end of the pin is connected to the through-hole of second arm to adjust the pin along the axial direction side
To displacement.
2. the tappet according to claim 1 for the petrolift, wherein
Part and the pin in the inner circumferential surface (17a) of the through-hole of second arm on the side of the cam
Another described end between separating distance be greater than second arm the through-hole inner circumferential surface (17a) in be located at
Separating distance between another described end of part and the pin on the side of the plunger.
3. the tappet according to claim 1 or 2 for the petrolift, further includes:
It is press-fitted component (60), is press-fitted at least one of one end of the pin and another end
In the end surface (40a, 40b) of the axial direction, so as to along the radial direction extension for being orthogonal to the axial direction
One end of the pin and the length of at least one of another end.
4. the tappet according to claim 1 for the petrolift, further includes:
Concave part (43,18), be formed in another end of the pin outer peripheral surface (40c) and second arm
Each of the inner circumferential surface (17a) of the through-hole on, to extend along circumferential direction around the axial direction, and
Adjustment means (50) are set to each of the concave part in the outer peripheral surface and the inner circumferential surface
In a, wherein
Adjustment means contact be defined in the outer peripheral surface and the inner circumferential surface each on it is described
Another end described in the pin is connected to second arm by the wall surface (43a, 18a) of concave part.
5. the tappet according to claim 4 for the petrolift, wherein
In the outer peripheral surface and the inner circumferential surface, wall surface has relative to the adjustment means along the axial direction
Direction is located at the wall surface on that side of first arm and is located at institute along the axial direction relative to the adjustment means
State the wall surface in the opposite side of the first arm；And
The adjustment means are all contacted with two wall surfaces in the outer peripheral surface and the inner circumferential surface.
6. the tappet according to claim 4 or 5 for the petrolift, wherein
The adjustment means are configured to extend along the circumferential direction, and
Contact between the adjustment means and the wall surface in the outer peripheral surface and the inner circumferential surface is extremely
Few a part is continuous along the circumferential direction.
7. the tappet according to claim 2 for the petrolift, further includes:
Concave part (43,18), be formed in another end of the pin outer peripheral surface (40c) and second arm
Each of the inner circumferential surface (17a) of the through-hole on, to extend along circumferential direction around the axial direction, and
Adjustment means (50) are set to each of the concave part in the outer peripheral surface and the inner circumferential surface
In a, wherein
Adjustment means contact be defined in the outer peripheral surface and the inner circumferential surface each on it is described
Another end described in the pin is connected to second arm by the wall surface (43a, 18a) of concave part.
8. the tappet according to claim 7 for the petrolift, wherein
In the outer peripheral surface and the inner circumferential surface, wall surface has relative to the adjustment means along the axial direction
Direction is located at the wall surface on that side of first arm and is located at institute along the axial direction relative to the adjustment means
State the wall surface in the opposite side of the first arm；And
The adjustment means are all contacted with two wall surfaces in the outer peripheral surface and the inner circumferential surface.
9. the tappet according to claim 3 for the petrolift, further includes:
Concave part (43,18), be formed in another end of the pin outer peripheral surface (40c) and second arm
Each of the inner circumferential surface (17a) of the through-hole on, to extend along circumferential direction around the axial direction, and
Adjustment means (50) are set to each of the concave part in the outer peripheral surface and the inner circumferential surface
In a, wherein
Adjustment means contact be defined in the outer peripheral surface and the inner circumferential surface each on it is described
Another end described in the pin is connected to second arm by the wall surface (43a, 18a) of concave part.
10. the tappet according to claim 9 for petrolift, wherein
In the outer peripheral surface and the inner circumferential surface, wall surface has relative to the adjustment means along the axial direction
Direction is located at the wall surface on that side of first arm and is located at institute along the axial direction relative to the adjustment means
State the wall surface in the opposite side of the first arm；And
The adjustment means are all contacted with two wall surfaces in the outer peripheral surface and the inner circumferential surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017213031A JP6954011B2 (en) | 2017-11-02 | 2017-11-02 | Fuel pump tappet |
| JP2017-213031 | 2017-11-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109751164A true CN109751164A (en) | 2019-05-14 |
| CN109751164B CN109751164B (en) | 2022-03-29 |
Family
ID=66138011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811172016.5A Active CN109751164B (en) | 2017-11-02 | 2018-10-09 | Tappet for fuel pump |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6954011B2 (en) |
| CN (1) | CN109751164B (en) |
| DE (1) | DE102018119145B4 (en) |
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| CN1375629A (en) * | 2002-04-08 | 2002-10-23 | 江苏常发集团 | Ram type oil spraying pump and diesel oil engine therewith |
| US20070277763A1 (en) * | 2006-06-06 | 2007-12-06 | Brinks Barry T | Cam Roller Pin With Transverse Grooves |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2019085898A (en) | 2019-06-06 |
| DE102018119145A1 (en) | 2019-05-02 |
| JP6954011B2 (en) | 2021-10-27 |
| CN109751164B (en) | 2022-03-29 |
| DE102018119145B4 (en) | 2022-06-23 |
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