CN1255246C

CN1255246C - Piston plugging jig and method

Info

Publication number: CN1255246C
Application number: CN 01140745
Authority: CN
Inventors: 樱井仁朗
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2000-08-03
Filing date: 2001-08-03
Publication date: 2006-05-10
Anticipated expiration: 2021-08-03
Also published as: JP2002046082A; JP4342091B2; CN1344599A

Abstract

In order to insertion of a piston P of a small piston assembly Q into a cylinder sleeve S, this invention provides an insertion jig. The insertion jig has a guide cylinder 3 for guiding the piston P of the small piston assembly Q to the entrance of the cylinder sleeve S when the piston P is inserted into the cylinder sleeve S, and a setting plate 2 integrated with the guide cylinder 3. The setting plate 2 is provided with a setting hole 2h for aligning the axis of the piston P with the axis of the cylinder sleeve S, and the setting hole is engaged with the knock pin n of a cylinder block B. A tapered face 3t reducing the diameter of the piston ring Pr is provided on the inner surface of the guide cylinder 3. Cutouts 2k and 3k each broader than the width of a connecting rod are provided in the sides of the setting plate 2 and the guide cylinder 3. AS a result, insertion of a piston of a small piston assembly into a cylinder sleeve can improve workability while preventing a piston ring from being hooked or damaged.

Description

Piston inserts anchor clamps and piston insertion method

Technical field

The present invention relates to a kind of piston component that piston and bent axle and connecting rod integral are linked together and be inserted into anchor clamps in the cylinder jacket.

Background technology

Be generally used in the assembly method of motorcycle, a small-sized piston assembly that is linked together by piston and bent axle and connecting rod integral is loaded in the cylinder body.As shown in Figure 8, cylinder body B is fixed on the workbench usually, and makes the axis of cylinder jacket S be in vertical direction.The operator catches bent axle C and by the axis normal that makes piston P piston P is inserted among the cylinder jacket S, the vertical mobile bent axle C several times of operator so that piston ring Pr and cylinder jacket S adapt.But this method is to be difficult to piston P vertically is inserted among the cylinder jacket S.And the diameter of the piston ring Pr diameter than cylinder jacket S slightly is big.As a result, not blocked by cylinder jacket S be exactly to be damaged to piston ring Pr.In this case, applicant of the present invention has proposed a kind of insertion apparatus operating that automatically performs this piston in Japanese patent application Hei-11-29321 (29321/1999).

According to this equipment, cylinder body is disposed on the workbench of fixing it, and makes a piston receiving element that is inserted in the cylinder jacket vertically to move by workbench.When piston is pressed into, the top of piston is fixed on the piston receiving element, the piston receiving element moves down simultaneously, and piston just can be inserted into and hold the position of piston place in the piston bush like this.

Yet though described technology can prevent to a certain extent that piston ring from being blocked or damaging by cylinder jacket, the shortcoming of this technology is still to expend a large amount of parts that manually come ring installation one class.

Summary of the invention

Therefore one of purpose of the present invention is to prevent that piston ring from being blocked or damaging by cylinder jacket, and provides better, the improved piston of a kind of efficient to insert anchor clamps.

To achieve these goals, the present invention proposes a kind of piston and inserts anchor clamps, the small-sized piston assembly that these anchor clamps are used for being linked together by piston and bent axle and connecting rod integral is encased in piston bush, these anchor clamps comprise that a guiding piston enters into guide barrel and location-plate that guide barrel is positioned at the pre-position of cylinder body of cylinder jacket, it is characterized in that, be furnished with a device that when piston inserts in the cylinder jacket, reduces the piston ring diameter on this guide barrel, and be furnished with the detent mechanism of the dead in line of an axis that makes cylinder jacket and guide barrel on this location-plate, wherein each side of guide barrel and location-plate all is furnished with an otch wideer than connecting rod.

In case location-plate is placed on precalculated position in the cylinder body and makes the axis of cylinder jacket and the dead in line of guide barrel, and when piston when guide barrel is pressed into, piston just can be inserted into cylinder jacket and suffer.

At this moment, piston presses down, and the piston ring diameter reducing mechanism that the diameter of piston ring is directed tube reduces, and piston maintains by guide barrel when pressing down.Piston just can insert smoothly like this.

The diameter reducing mechanism of guide barrel can be, for example, and an inclined-plane that tilts to form by the guide barrel inner surface.The diameter that enters a side of this mechanism is bigger slightly than piston ring, and the diameter of a side of coming out roughly equates with cylinder jacket.The detent mechanism of location-plate can by, for example alignment pin or the kindred organization on cylinder body constitutes, wherein alignment pin matches with opening on the location-plate.

Each side at guide barrel and location-plate has all formed an opening wideer than connecting rod.Like this, after piston is inserted in the cylinder jacket, passes opening by axis and just can remove inserting anchor clamps with connecting rod.

On the contrary, if do not have the opening anchor clamps just can not be split except can disturb parts such as bent axle because insert anchor clamps.

Above and other objects of the present invention, characteristics and advantage can become clearer by the description of reference accompanying drawing.

Description of drawings

Fig. 1 is the viewgraph of cross-section that inserts anchor clamps according to piston of the present invention;

Fig. 2 is the plane that inserts anchor clamps according to piston of the present invention;

Fig. 3 is the side view of arrow A direction among Fig. 2;

Fig. 4 is the plane of cylinder body;

Fig. 5 is the view that discloses the insertion situation of piston;

Fig. 6 shows is plane after anchor clamps are removed after the piston insertion;

Fig. 7 is the perspective view of a small-sized piston assembly;

Fig. 8 is used to explain that traditional piston inserts the view of operation.

The specific embodiment

Below with reference to accompanying drawings the preferred embodiments of the present invention are described.As shown in Figure 7, it is auxiliary clamps that piston of the present invention inserts the anchor clamps improvements, the piston bush S that is used for the piston P of a small-sized piston assembly Q is inserted a cylinder body B goes, among this piston component Q, bent axle C, connecting rod R and piston P interconnect, among this cylinder body B, one side of something of a crankcase is in the same place with a cylinder integral installation.So just can be blocked or damage by cylinder jacket S so that workbench prevents piston ring Pr easily.

That is to say that as shown in Figures 1 to 3, this piston inserts anchor clamps 1 and has a location-plate 2 that is used for being located in the crankcase pre-position, and the guide barrel 3 of the insertion of a guiding piston P.In case location-plate 2 is positioned at the precalculated position, the axis of guide barrel 3 will with the dead in line of cylinder jacket S.

Thereby the end of location-plate 2 by making guide barrel 3 from the middle part of location-plate 2 by being integrally formed on the guide barrel.Two diagonal positions at location-plate 2 are furnished with two locating hole 2h as detent mechanism.

The alignment pin that locating hole 2h is used for two positions on the parting surface with the crankcase that is arranged in cylinder body B overlaps, as shown in Figure 4.When location-plate 2 was installed on the parting surface, alignment pin n can be inserted among the locating hole 2h.

After location-plate 2 navigated on the parting surface of crankcase, as shown in Figure 5, the lower end of guide barrel 3 was connected to the upper end of cylinder jacket S.So, the lower end of guide barrel 3 has just formed one and is used for being connected shape with the upper end of cylinder jacket S overlaps.

In addition, as shown in Figure 1, the inner surface of guide barrel 3 has formed an inclined-plane 3t as piston ring diameter reducing mechanism near the part of upper end.The diameter of upper end open one side of this inclined-plane 3t is bigger, and its lower end diameter is less.The diameter of the diameter major part of upper end open one side is bigger than the diameter of piston ring Pr, and the diameter of lower end the diameter than piston ring Pr is little a little.

Vertical in vertical direction respectively opening 2k and the 3k of being formed with of the side of location-plate 2 and guide barrel 3.The width of opening 2k and 3k is bigger than connecting rod R.

These openings are used for after following piston P is inserted into cylinder jacket S, when anchor clamps 1 dismounting is pulled out, prevent that anchor clamps 1 from disturbing small-sized piston assembly Q.

In this connection, the upper surface of guide barrel 3 as shown in Figure 3, is furnished with an inclined plane v, as be both by in the middle of opening 3k is arranged in inclination cut a part of formed.This inclined plane is used for preventing that in the demolishing process of following anchor clamps 1 anchor clamps 1 from disturbing connecting rod R.

To the operation that piston inserts anchor clamps 1 be described below.

At first, the parting surface of the cylinder body B of cylinder jacket S vertically being placed and is fixed on crankcase upwards.Shown in the chain-dotted line among Fig. 4, the locating hole 2h of location-plate 2 matches with alignment pin n, makes location-plate 2 and parting surface be installed together.

At this moment, the lower end of guide barrel 3 is connected the upper end of cylinder jacket S as shown in Figure 5, so that two deads in line.

Then, the operator catches parts such as bent axle C and small-sized piston assembly Q to keep piston P sagging, and by the upper end open part of guide barrel 3 piston P is inserted.As shown in Figure 5, if small-sized piston assembly Q is to pressing down, the diameter of piston ring Pr is reduced by chamfered portion 3t, and piston P is inserted into the bottom of cylinder jacket S smoothly then.

When piston P be inserted into finish among the cylinder jacket S after, as shown in Figure 6, the axis of the bent axle C of small-sized piston assembly Q is laterally removed the axis of piston P.Connecting rod R moves on opening 2k and the 3k then.Upwards pull out on this direction if insert anchor clamps 1, opening 2k and 3k have passed through the part of connecting rod.In this mode, insert anchor clamps 1 and can pull out without lifting an eyebrow.

According to above-mentioned method, the diameter of piston ring Pr is to reduce continuously in the process of inserting cylinder jacket S.And piston P can very perfectly remain on the upright position.So insert operation and just become easily, and can guarantee the installation quality of piston ring Pr.

Certainly it should be noted that the present invention is not limited only to above-mentioned specific embodiment.If in essence with the described structure of claim of the present invention and method and the identical example of effect, belong to technical scope of the present invention equally.For example, locating hole 2h is exactly an example of the detent mechanism on the location-plate 2.

As mentioned above, piston provided by the invention inserts on the anchor clamps has guide barrel, has piston ring diameter reducing mechanism and the location-plate with detent mechanism on it, and these anchor clamps are used for the small-sized piston assembly is inserted into cylinder jacket.Each side at guide barrel and location-plate also is formed with the opening of a width greater than connecting rod.So just can when reducing the piston ring diameter, piston be inserted in the cylinder jacket, thereby keep position of piston.So just can be so that fitting operation is easier and can guarantee to install quality afterwards.

Claims

1, a kind of piston inserts anchor clamps, and the small-sized piston assembly that these anchor clamps are used for being linked together by piston and bent axle and connecting rod integral is encased in piston bush, and these anchor clamps comprise:

A guiding piston enters into the guide barrel of cylinder jacket;

A location-plate that guide barrel is positioned at the pre-position in the cylinder body;

It is characterized in that,

Be furnished with inclined-plane (3t) on this guide barrel, when piston inserted in the cylinder jacket, this inclined-plane (3t) reduced the piston ring diameter,

Be furnished with the locating hole (2h) of the dead in line of an axis that makes cylinder jacket and guide barrel on this location-plate, match with alignment pin (n) on the cylinder body;

Wherein each side of guide barrel and location-plate all is furnished with an otch wideer than connecting rod;

The part of the upper surface of guide barrel be an inclined plane that aperture arrangement is formed in the centre position (v);

The bottom diameter that inclined-plane (3t) is arranged to guide barrel is littler than the internal diameter of cylinder jacket.

2, a kind of piston insertion method of using the described piston of claim 1 to insert anchor clamps comprises the steps:

Location-plate is installed on the cylinder body;

The upper end open of piston by guide barrel partly is inserted in the cylinder jacket, reduces the diameter of piston ring simultaneously;

After insertion is finished, the bent axle of small-sized piston assembly is removed from the axis of piston;

Connecting rod is overlapped with the opening that is formed on guide barrel and each side of location-plate;

To insert anchor clamps in this case directly upwards pulls out.