CN201856074U

CN201856074U - Pressing head structure

Info

Publication number: CN201856074U
Application number: CN2010205828186U
Authority: CN
Inventors: 王忠信; 李中友
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2011-06-08
Anticipated expiration: 2020-10-29

Abstract

The utility model discloses a pressing head structure. An outer pressing head is internally provided with a guiding and positioning shaft, an inner pressing head spring and a positioning shaft spring; a guiding screw plug is arranged in an inner hole in the upper part of the outer pressing head; an inner pressing head is arranged in an inner hole in the lower part of the outer pressing head; a positioning groove is arranged in the bottom surface of the outer pressing head; at least two positioning holes are arranged in the circumferential wall of the positioning groove and are uniformly distributed along the circumference of the wall; each positioning hole is internally provided with a steel ball which is equipped with a reed; and the upper part of the reed is fixed with the outer pressing head, and the lower part of the reed is pressed on the corresponding steel ball, so that a small part of a body of the steel ball is positioned in the positioning groove. With the pressing head which is simple in structure, the labor intensity of workers is low, the working efficiency of the workers is high, a valve, a valve lock sheet and a spring upper seat are not easy to be damaged during pressing, and furthermore, the positioning of the spring upper seat and a valve rod is more accurate, and the lock sheet is easier to be pressed to be in place, therefore, the lock sheet can be effectively prevented falling off during the operation of an engine and can not pop up or oblique so as to improve the assembly efficiency.

Description

A kind of pressure head structure

Technical field

The utility model belongs to technical field of tooling clamps, and specifically, particularly the pressure head structure of engine valve locking plate is used for valve split collets is press-fited in the valve and the spring seat of honour.

Background technology

In the engine assembling process, it is a very important link that valve split collets is installed.At present, the valve split collets assembling mode that each engine production producer is adopted is: locking plate is loaded in the spring seat of honour, is positioned on the valve spring again, press-fit by press.The defective of this kind press-fit approach is: valve spring freely swinging on cylinder cap is bigger; the axial line of valve stem and the spring seat of honour and pressure head location is inaccurate when causing press-fiting; increased the difficulty of assembling; cause locking plate press-loading not in place easily; locking plate ejects in the time of usually can press-fiting; or it is stressed crooked to press-fit in the process locking plate; cause press-fiting and to finish smoothly; prolonged installation time on the one hand; the efficient that press-fits is lower; on the other hand, increased workman's workload, and workman's proficiency has been had relatively high expectations.In addition, in the process that press-fits, the guide-localization axle in the pressure head is beated easily, also can influence the efficient and the accuracy of locking plate press-loading.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of pressure head structure that valve split collets accurately is press-fit into place.

The technical solution of the utility model is as follows: a kind of pressure head structure, comprise guiding plug screw, outer ram, guide-localization axle, inner ram spring, locating shaft spring, inner ram, reed and steel ball, in outer ram, be provided with guide-localization axle, inner ram spring and locating shaft spring, the guiding plug screw is installed in the endoporus on outer ram top, in the endoporus of outer ram bottom inner ram is installed, and the bottom surface of outer ram is provided with locating slot.On the perisporium of described locating slot, be provided with at least two by the equally distributed locating hole of circumference, steel ball all is housed in each locating hole, each steel ball is equipped with a reed, the top and the outer ram of described reed fix, the bottom compressing of reed makes the fraction ball body of steel ball be positioned at described locating slot on the steel ball of correspondence.

Adopt above technical scheme, steel ball and reed with matching are formed self-locking mechanism.Be provided with at least two in the periphery of locating slot and press the equally distributed self-locking mechanism of circumference, steel ball in each self-locking mechanism is under the effect of reed elastic force, can the spring seat of honour and the locking plate in the locating slot of packing into be positioned, the axial line accurate positioning of valve stem and the spring seat of honour and pressure head when having guaranteed like this to press-fit, can prevent effectively that the spring seat of honour from coming off in the process that press-fits, prevented that simultaneously valve spring from freely swinging on cylinder cap, made press-fiting of valve collet faster, accurate.

In order to strengthen stability and reliability to the spring seat of honour and locking plate location, be convenient to steel ball simultaneously and install, prevent that steel ball from coming off, on the perisporium of described locating slot, be provided with three by the equally distributed locating hole of circumference, this locating hole is taper, and the inner orifice of locating hole is less than outer aperture.

Reed is installed for convenience, it is firm that reed is connected with outer ram, and guarantee the flexibility and the reliability of steel ball motion, and the top of described reed and the periphery of outer ram fit, and, has the gap between the bottom of reed and the periphery of outer ram by bolting.

The upper end of described guide-localization axle is stretched in the installing hole of guiding plug screw, and inner ram is passed in the lower end of guide-localization axle, and stretches out the bottom surface of outer ram; At the middle part of described guide-localization axle suit locating shaft spring, the upper end of this locating shaft spring is stretched in the installing hole of guiding plug screw, and with this installing hole in the step surface butt, the boss butt of the lower end of locating shaft spring and guide-localization axle bottom, this boss reclines mutually with the end face of inner ram; Described inner ram spring is positioned at the outside of locating shaft spring, the bottom surface butt of the upper end of this inner ram spring and guiding plug screw, and the lower end of inner ram spring and the end face of inner ram connect.Above structure is assembled on the one hand easily, is gone slick, on the other hand, the bottom surface of outer ram is stretched out in the lower end of guide-localization axle, when press-fiting locking plate, the lower end of guide-localization axle can be stretched in the spring seat of honour, play guide-localization, ejected by the active force of valve stem or take place crookedly, avoided the locking plate assembling not in place.Simultaneously, positioning accuracy by guiding plug screw and inner ram location, has been improved respectively in the top and bottom of guide-localization axle.

The beneficial effects of the utility model are:

1, make pressure head have guide function, simple to operate, working strength of workers is little, high efficiency;

Not fragile valve, valve split collets and the spring seat of honour when 2, press-fiting;

3, during locking plate press-loading, the spring seat of honour and valve stem location are more accurate, and locking plate is easier to be press-fit into place, and has prevented that effectively locking plate from coming off in engine operation process;

4, locking plate can not eject or crooked when assembling, has improved efficiency of assembling.

5, property easy to use, safe is good.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the enlarged drawing of looking up of Fig. 1.

Fig. 3 press-fits the state diagram of locking plate for the utility model.

The specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1 and Figure 2, the utility model is made of guiding plug screw 1, outer ram 2, guide-localization axle 3, inner ram spring 4, locating shaft spring 5, inner ram 6, bolt 7, reed 8 and steel ball 9, wherein outer ram 2 offers the step endoporus along its direction of axis line, the endoporus on outer ram 2 tops is a thread segment, packing in the endoporus on outer ram 2 tops in the bottom of described guiding plug screw 1, is fixed together by being threaded.The top of guiding plug screw 1 be circle or square, adapts with the pilot hole of press lifting shaft.Middle part in outer ram 2 bottom surfaces offers locating slot 2a, and inner ram 6 is installed in the endoporus of outer ram 2 bottoms, and the bottom land of locating slot 2a is passed in the lower end of this inner ram 6, and is arranged in locating slot 2a, and the bottom surface of inner ram 6 is concordant with the bottom surface of outer ram 2.The top of described inner ram 6 has the annular stop platform, and the step surface in the bottom surface of this limiting stand and outer ram 2 endoporus fits spacing.

From Fig. 1, Fig. 2, as can be known, in outer ram 2, be provided with guide-localization axle 3, inner ram spring 4 and locating shaft spring 5.Wherein the upper end of guide-localization axle 3 is stretched in the installing hole of guiding plug screw 1 direction of axis line.The centre bore of inner ram 6 is passed in the lower end of guide-localization axle 3, and stretches out the bottom surface of outer ram 2.At the middle part of described guide-localization axle 3 suit locating shaft spring 5, the upper end of this locating shaft spring 5 is stretched in the installing hole of guiding plug screw 1, and with this installing hole in the step surface butt, the boss 3a butt that the lower end of locating shaft spring 5 and guide-localization axle 3 bottoms are integrally formed, this boss 3a reclines mutually with the end face of inner ram 6.Described inner ram spring 4 is positioned at the outside of locating shaft spring 5, the bottom surface butt of the upper end of this inner ram spring 4 and guiding plug screw 1, and the end face of the lower end of inner ram spring 4 and inner ram 6 connects.

Open as can be known from Fig. 1, Fig. 2, be provided with at least two by the equally distributed locating hole of circumference on the perisporium of outer ram 2 bottom locating slot 2a, the number of locating hole can be two, three, four or more, is preferably three in the present embodiment.Described locating hole is taper, and the inner orifice of locating hole is less than outer aperture.Steel ball 9 all is housed in each locating hole, the outside of each steel ball 9 is equipped with a reed 8, the periphery of the top of described reed 8 and outer ram 2 bottoms fits, and it is fixing by bolt 7, has certain interval between the periphery of the bottom of reed 8 and outer ram 2 bottoms, and the compressing of the bottom of reed 8 makes the fraction ball body of steel ball 9 be positioned at described locating slot 2a on the steel ball 9 of correspondence.

Operation principle of the present utility model is as follows:

As Fig. 3 and in conjunction with Fig. 1, shown in Figure 2, valve split collets 11 is packed in 10 holes, the spring seat of honour, integral body is positioned among the outer ram 2 locating slot at bottom 2a from the bottom up again, the spring seat of honour 10 promotes steel ball 9, the elastic force that makes steel ball 9 overcome reed 8 outwards moves, in locating slot 2a is packed at the spring seat of honour 10 fully into, under the elastic force effect of reed 8, each steel ball inwardly motion resets, together to 10 location, the spring seat of honour; Meanwhile, the lower end of guide-localization axle 3 is stretched in the spring seat of honour 10, to 11 location of the valve split collets in the spring seat of honour 10.Treat that the spring seat of honour 10 and valve split collets 11 are after installing on the pressure head, cylinder head is placed on the special-purpose anchor clamps in pressure head below, pressure head overlaps with the valve axial line over against the valve 12(pressure head axial line on the cylinder head), the lifting shaft of control press moves downward, the lifting shaft of press drives pressure head and presses down, the spring seat of honour 10 contacts with valve spring 13 on the valve 12, compression valve spring 13, and guide-localization axle 3 contacts with valve 12; Continue to exert pressure downwards, valve 12 keeps motionless, under the pressure head active force, valve 12 promotes guide-localization axle 3 and moves up, and the spring seat of honour 10 moves down with valve split collets 11, inner ram 6 is subjected to the active force of inner ram spring 4 simultaneously, valve split collets 11 is pushed in the annular groove of valve 12, and valve split collets 11 is press-fit into place.Upwards lift pressure head, because valve split collets 11, valve 12 and the spring seat of honour 10 are locked, the spring seat of honour 10 extruding steel balls 9, steel ball 9 actuating springs 8 make the spring seat of honour 10 withdraw from pressure head simultaneously, have finished the whole process that press-fits thus.

Claims

1. pressure head structure, in outer ram (2), be provided with guide-localization axle (3), inner ram spring (4) and locating shaft spring (5), guiding plug screw (1) is installed in the endoporus on outer ram (2) top, in the endoporus of outer ram (2) bottom inner ram (6) is installed, and the bottom surface of outer ram (2) is provided with locating slot (2a), it is characterized in that: on the perisporium of described locating slot (2a), be provided with at least two by the equally distributed locating hole of circumference, steel ball (9) all is housed in each locating hole, the outside of each steel ball (9) is equipped with a reed (8), the top of described reed (8) and outer ram (2) fix, the bottom compressing of reed (8) makes the fraction ball body of steel ball (9) be positioned at described locating slot (2a) on the steel ball (9) of correspondence.

2. pressure head structure according to claim 1 is characterized in that: be provided with three by the equally distributed locating hole of circumference on the perisporium of described locating slot (2a), this locating hole is taper, and the inner orifice of locating hole is less than outer aperture.

3. pressure head structure according to claim 1 is characterized in that: the periphery of the top of described reed (8) and outer ram (2) fits, and fixing by bolt (7), has the gap between the periphery of the bottom of reed (8) and outer ram (2).

4. according to claim 1 or 2 or 3 described pressure head structures, it is characterized in that: the upper end of described guide-localization axle (3) is stretched in the installing hole of guiding plug screw (1), inner ram (6) is passed in the lower end of guide-localization axle (3), and stretches out the bottom surface of outer ram (2); At the middle part of described guide-localization axle (3) suit locating shaft spring (5), the upper end of this locating shaft spring (5) is stretched in the installing hole of guiding plug screw (1), and with this installing hole in the step surface butt, boss (3a) butt of the lower end of locating shaft spring (5) and guide-localization axle (3) bottom, this boss (3a) reclines mutually with the end face of inner ram (6); Described inner ram spring (4) is positioned at the outside of locating shaft spring (5), the bottom surface butt of the upper end of this inner ram spring (4) and guiding plug screw (1), and the end face of the lower end of inner ram spring (4) and inner ram (6) connects.