CN100427274C

CN100427274C - Pulling unit

Info

Publication number: CN100427274C
Application number: CNB2007100133520A
Authority: CN
Inventors: 刘之增
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-25
Filing date: 2007-02-25
Publication date: 2008-10-22
Anticipated expiration: 2027-02-25
Also published as: CN101020306A

Abstract

The pulling unit has one expanding sleeve with outer surface fitting the valve seat and inner surface fitting one conic spindle and cut into three equal parts connected through the springs in the slots, one small pressure plate mounted to one end of the expanding sleeve, one screw sleeve screwed to the stud of the conic spindle, one large pressure plate mounted on the surface of cylinder cover, and one nut with two welded handles mounted on the screw sleeve. After the expanding sleeve is mounted inside the conic spindle and inside the hole of the valve seat and the screw sleeve is turned to press the small pressure plate and make the outer surface of the expanding sleeve contact with the inner surface of the valve seat, the valve seat may be disassembled easily. The pulling unit is simple, convenient and reliable.

Description

Pulling unit

Affiliated technical field

The present invention relates to a kind of mechanical provision for disengagement, especially pulling unit.

Background technology

Cover parts is common machine components, and it is contained in the position such as friction, sealing of parts such as casing, support, cylinder cap.By changing the service life that cover plays parts such as prolonging casing, support, cylinder cap.The cover that is contained in the part through hole can eject it with the end of simple tools from the hole, and dismounting is than being easier to.And the hole of installation sleeve is when obstructed, and grip is pulled down just cumbersome from the hole.For example the valve seat insert of 16V240 cylinder head just is mounted in the valve seat orifice on the face of combustion chamber, and the magnitude of interference reaches 0.06～0.08 millimeter.Cylinder head is costly part, and valve seat insert will more renew when may wear to the obsolete limit, and the structure of cylinder head can't eject it with instrument when making the dismounting valve seat insert.Common way is: 1, cylinder head is contained on the milling machine and with slotting cutter valve seat insert is milled disconnected the taking-up.Because the hardness of valve seat insert is higher, the milling difficulty will be milled when disconnected very carefully at valve seat insert, once not noticing that milling cutter mills on the cylinder head cylinder head has been scrapped.2, the reinforcing bar of burn-oning on valve seat insert pulls it.Welding also can cause cylinder head to scrap, because that the magnitude of interference of valve seat insert and cylinder head is big is also difficult when drawing valve seat insert with reinforcing bar.Yi Shang method is all undesirable in a word.

Summary of the invention

Valve seat insert is pulled down from cylinder head for convenience designed a kind of pulling unit, valve seat insert pulled down under the effect of nut with the expansion set drive valve seat insert of instrument.

The technical solution adopted for the present invention to solve the technical problems is: design a kind of pulling unit, be made up of big platen, spring, little platen, nut, handle, swivel nut, tapering mandrel, expansion set.Expansion set is consistent with valve seat insert endoporus and end opening chamfer surface by outer surface, inner surface and the consistent cover of tapering mandrel outer surface of cone, with metal saw by 3 five equilibriums mill out constitute, link together by the spring that is contained in their common grooves; Expansion set is contained in the endoporus of valve seat insert after being contained in the small end of tapering mandrel, little platen is contained on the expansion set end face, swivel nut is contained in its internal thread on the double-screw bolt of tapering mandrel, compresses little platen by rotary threaded sleeve and makes the outer surface of expansion set and the endoporus and the end opening chamfer surface of valve seat insert fit tight; Big platen is contained on the face of cylinder head, and nut is contained on the swivel nut, and two handles are welded on the both sides of nut respectively.

Spring is an O type rubber seal.Corresponding outer six sides surface has all been designed in the double-screw bolt end of tapering mandrel and the upper end of swivel nut.

The invention has the beneficial effects as follows, can be under the situation of not damaging valve seat insert and cylinder head, valve seat insert is pulled down easily.Interior cover extracting tool is simple in structure, easy to use and reliable.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is a front view of the present invention.

Fig. 2 is the cutaway view at Figure 1A-A place.

Fig. 3 be Figure 1B to view.

1. cylinder head among the figure, 2. big platen, 3. valve seat insert, 4. spring, 5. little platen, 6. nut, 7. handle, 8. swivel nut, 9. tapering mandrel, 10. expansion set.

The specific embodiment

Accompanying drawing is the pulling unit by the valve seat insert design of dismounting 16V240 cylinder cover for diesel engine.By the design of common mechanical part, all there is chamfering at valve seat insert endoporus two ends, and also there is chamfering the bottom surface, hole that contacts with valve seat insert.Thereby the design principle of valve seat insert extracting tool is exactly to utilize the inner surface of the expansion set tensioner valve seat insert of outer radius variableization that valve seat insert is taken out.With reference to accompanying drawing, chamfer surface was consistent under expansion set 10 was reached by outer surface and valve seat insert 3 endoporus, and the metal saw of applying mechanically that inner surface is consistent with tapering mandrel 9 outer surface of cone mills out by 3 five equilibriums, links together by the spring 4 that is contained in their common grooves.Spring 4 can be used the extension spring of steel wire circle, the O type rubber seal that also available size is suitable.What the valve seat insert extracting tool was used is exactly the O type rubber seal of using on the cylinder head assembly parts.When the size of milling cutter otch should be able to satisfy expansion set 10 and is contained in tapering mandrel 9 cone small ends, its external diameter corresponding with bottom, valve seat insert hole chamfering can be put in the endoporus of valve seat insert 3.Expansion set 10 is contained in the endoporus of valve seat insert 3 after being contained in the small end of tapering mandrel 9, and jut corresponding with bottom, valve seat insert hole chamfering on the expansion set 10 aligns with valve seat orifice bottom chamfering.For the expansion set 10 that is contained in the valve seat insert 3 is adjacent to valve seat endoporus and chamfering, little platen 5 is contained on expansion set 10 end faces, swivel nut 8 is contained on the double-screw bolt of tapering mandrel 9, compresses little platen 5 by rotary threaded sleeve 8 and makes the external diameter increase of expansion set 10 and the bore area tensioner of valve seat insert.Big platen 2 is contained on the face of cylinder head 1, and nut 6 is contained on the swivel nut 8, valve seat insert 3 is pulled out from the hole of cylinder head 1 in expansion set 10 tensioner valve seat inserts 3 by handle 7 rotating nuts 6 that are welded on nut 6 both sides.Then, backward rotation is contained in the swivel nut 8 on the tapering mandrel 9, unclamps little platen 5, and expansion set 10 is moved to tapering mandrel 9 small ends, and expansion set 10 cylindricals shrink, and just can take off valve seat insert 3 from expansion set 10.For this reason, corresponding outer six sides surface has all been designed in the upper end of the double-screw bolt end of tapering mandrel 9 and swivel nut 8.Cover for the blind hole of packing into generally all can be designed chamfering, so that pull it with pulling unit.

The pulling unit that is used for valve seat insert uses through long-term, and is convenient and reliable, saves man-hour than former method, guarantees that cylinder head is not damaged, and obtains favorable economic benefit.

Claims

1, a kind of pulling unit, form by big platen, spring, little platen, nut, handle, swivel nut, tapering mandrel, expansion set, it is characterized in that: expansion set is consistent with valve seat insert endoporus and end opening chamfer surface by outer surface, inner surface and the consistent cover of tapering mandrel outer surface of cone, with metal saw by 3 five equilibriums mill out constitute, link together by the spring that is contained in their common grooves; Expansion set is contained in the endoporus of valve seat insert after being contained in the small end of tapering mandrel, little platen is contained on the expansion set end face, swivel nut is contained in its internal thread on the double-screw bolt of tapering mandrel, compresses little platen by rotary threaded sleeve and makes the outer surface of expansion set and the endoporus and the end opening chamfer surface of valve seat insert fit tight; Big platen is contained on the face of cylinder head, and nut is contained on the swivel nut, and two handles are welded on the both sides of nut respectively.

2, pulling unit according to claim 1 is characterized in that: spring can be changed to O type rubber seal.

3, pulling unit according to claim 1 is characterized in that: the double-screw bolt end design of tapering mandrel has corresponding outer six sides surface.

4, pulling unit according to claim 1 is characterized in that: the upper end design of swivel nut has corresponding outer six sides surface.