CN1208524C

CN1208524C - Teeth fixing structure of digging shovel

Info

Publication number: CN1208524C
Application number: CNB021261202A
Authority: CN
Inventors: 千岁良二
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2001-07-17
Filing date: 2002-07-16
Publication date: 2005-06-29
Anticipated expiration: 2022-07-16
Also published as: JP2003027532A; JP4771623B2; CN1397693A; KR20030007219A

Abstract

The present invention provide a tooth fixing structure of an excavating bucket facilitating the insertion and removal of a pin for fixing a tooth to an adapter, thereby enhancing the efficiency for the operation of attaching or replacing the tooth. In the tooth fixing structure, side part holes are bored in the tooth in the transverse, and the tooth is fixed to the adapter by a pin body passed through the through holes. A C-shaped spring for frictional engagement with the inner peripheral surface of one longitudinal side end portion of the through hole in the adapter is attached to the pin body.

Description

The fixture construction of the tooth of digging shovel

Technical field

The present invention relates generally to the fixture construction of the tooth on a kind of scraper bowl that is contained in hydraulic excavator.

Background technology

In the past, be fixed on structure on the Connection Block as the tooth on the scraper bowl that will be contained in hydraulic excavator, for example known have by the spy open the disclosed structure of 2000-104293 communique.In this communique, the leading section that discloses the Connection Block 52 on the limit 51 of being fixed in scraper bowl shown in Fig. 4 (a) embeds tooth 53, on Connection Block 52, fix tooth 53 by running through both pins 54 of Connection Block 52 and tooth 53, simultaneously, make the slot part 54a of described pin 54 concentric with the transverse direction hole 52a of Connection Block 52, and, constitute the structure of fixing described pin 54 to be entrenched in the mode that is disposed on the inner periphery of the split ring 55 of formed spot-facing end face portion 52b on the side end face of its Connection Block 52.In addition, symbol 56 is elastic rings of rubber system among the figure.

In addition, as other structure in the past, shown in Fig. 4 (b), known have the leading section of the Connection Block 62 on the limit 61 of being fixed in scraper bowl to embed tooth 63, by the pin 64 that runs through both fixed teeth 63 on Connection Block 62, simultaneously, the cross section that is contained in the central portion of pin main body 65 is the spring 66 of C shape, in mode, fix the structure of described pin 64 in the inner peripheral surface frictional engagement of the transverse direction hole of described Connection Block 62 62a.

Yet, opening by described spy in the 2000-104293 communique in the disclosed structure, must form the machining of described spot-facing end face portion 52b, so just the high problem of cost is arranged.In addition, when being encased in tooth 53 on the Connection Block 52, keep be embedded in the state of spot-facing end face 52b inner opening ring 55 on one side, tooth 53 must be embedded into the leading section of Connection Block 52 on one side, the problem of assembling difference is arranged like this.In addition, in other the structure in the past shown in described Fig. 4 (b),, between pin main body 65 and transverse direction hole 62a, fill in the mud etc., the very problem of difficulty of pin 64 of extracting is just arranged though there are not above these problems.

The present invention is for addressing these problems, and its objective is provides a kind of fixture construction of tooth of digging shovel of efficient of the loading and unloading exchanging operation of extracting, can improve thus tooth that can easily carry out tooth is fixed in the pin of Connection Block.

Summary of the invention

In order to achieve the above object, the fixture construction of the tooth of digging shovel of the present invention, be at tooth and fix on the Connection Block of this tooth and wear through hole respectively, lead to the fixture construction of tooth of on described Connection Block, fixing the digging shovel of described tooth in the pin of these through holes by inserting

It is characterized in that, will carry out the ring-spring of CONTACT WITH FRICTION, be contained on the described pin with the inner peripheral surface of a side end of the length direction of the through hole of described Connection Block.

According to the present invention, because described ring-spring is configured in the side end of length direction of the through hole of described Connection Block, so described pin extract operation the time, by described pin is extracted from a side of this ring-spring of packing into, in addition, when the insertion operation of described pin, by with described pin from the opposite side of this ring-spring side be housed insert, the frictional force that opposing produces between the through hole of this ring-spring and described Connection Block, and the distance that moves described pin is obviously shortened, thereby can carry out the insertion of extracting of described pin expeditiously.In addition, described pin extract operation the time, can reduce the amount of filling in of the mud that constitutes pull-out resistance etc., can easily squeeze out the outside of the through hole of Connection Block thus by ring-spring to the mud that constitutes this pull-out resistance etc.Thereby, can avoid extracting the operation very bad phenomenon of difficulty that becomes owing to what filling in of mud etc. made described pin.By the above, according to the present invention, can improve the insertion of described pin and extract efficiency of operation, thereby can improve the operating efficiency of the loading and unloading exchange of tooth.

In the present invention, it is better that described ring-spring is contained in the peripheral part of the endless groove that forms in described pin.In addition, this ring-spring is that cross section with width also littler than the width of described endless groove is that the spring of C shape is desirable.

Description of drawings

Fig. 1 is the overall perspective view of the digging shovel of one embodiment of the invention.

Fig. 2 is for tooth being fixed on the key diagram of the structure on the Connection Block, and figure (a) is that the sectional view of major part and figure (b) are the sectional views of the steady pin seen from the X-X cross section of (a).

Fig. 3 (a) is extracting operation and inserting the key diagram of operation of steady pin (b).

Fig. 4 (a) is the key diagram of tooth fixture construction in the past (b).

The specific embodiment

Below, to the specific embodiment according to the fixture construction of the tooth of digging shovel of the present invention, the limit describes with reference to the drawing limit.

The overall perspective view of in Fig. 1, having shown the digging shovel of one embodiment of the invention.In Fig. 2, shown for tooth being fixed on the structure key diagram on the Connection Block.

The digging shovel 1 of present embodiment is the scraper bowl that is provided at the leading section of oil pressure excavating machine not shown in the figures, have a plurality of Connection Blocks 10 that are weldingly fixed on scraper bowl blade 2 and the tooth that is embedded in the leading section of each Connection Block 10 (below be called " tooth ") 11.

In the present embodiment, shown in Fig. 2 (a), leading section at described Connection Block 10 wears transverse direction hole (corresponding to the through hole of Connection Block of the present invention) 10a respectively, on described tooth 11, wear side surface part hole (corresponding to the through hole of tooth of the present invention) 11a, 11a, by being inserted into the steady pin 12 of these transverse direction hole 10a and side

surface part hole

11a, 11a, tooth 11 can be fixed on the leading section of Connection Block 10 with loading and unloading.In addition, described transverse direction hole 10a, between the inner peripheral surface of the C shape spring 14 described later of the steady pin 12 of packing into and this transverse direction hole 10a, produce frictional force by the elastic dilatation power that has by this C shape spring 14, and by this frictional force steady pin 12 is fixed on the 10a of transverse direction hole, constitute the chimeric diameter of this C shape spring 14 with this.In addition, the mode of disturbing not take place and to form the diameter that inserts steady pin 12 with C shape spring 14 in described side

surface part hole

11a, 11a.

Described steady pin 12, as Fig. 2 (a) (b) shown in, by pin main body 13 with to be enclosed in cross section among this cannelure 13a be that the C shape spring (corresponding to ring-spring of the present invention) with required width 14 of C shape constitutes with cannelure 13a.In the present embodiment, in described transverse direction hole 10a and described side

surface part hole

11a, 11a, to insert the state of described steady pin 12, the outer peripheral face of described C shape spring 14 is the friction locked state at the inner peripheral surface of the side end (left end among the figure) of the length direction of this transverse direction hole 10a.Later on for convenience of explanation, on this steady pin 12, be a side end 12a with the end of C shape spring 14 sides of packing into, be tail side end 12b with the end of its opposition side.In addition so that this steady pin 12 from the beginning side end 12a be direction of insertion Q along the direction that the direction of caudal ward end 12b moves, correspondingly so that steady pin 12 direction that the direction along cephalad end 12a moves from tail side end 12b for extracting direction P.

Like this, to follow extracting operation and inserting operation, steady pin 12 respectively when extracting direction P and direction of insertion Q and move of steady pin 12, opposing can be reached and be shortened the distance D that moves it by the frictional force that produces between C shape spring 14 and the transverse direction hole 10a.In addition, in the sidewall 14a of the from the beginning side end 12a of C shape spring 14 side to extracting direction P until the distance L of the end of transverse direction hole 10a ₁, than C shape spring 14 from the sidewall 14b of tail side end 12b side to direction of insertion Q until the distance L of the other end of transverse direction hole 10a ₂Significantly shortened, the amount of filling in that reaches the mud that makes steady pin 12 constitute pull-out resistance when extracting direction P and move etc. reduces.

Extracting operation and inserting operation of the steady pin 12 that below loading and unloading of following tooth 11 is exchanged and carry out describes.

Carry out pin 12 extract operation in, be inserted in the state (with reference to Fig. 2) of transverse direction hole 10a and side

surface part hole

11a, 11a in steady pin 12, to the end face of the tail side end of this steady pin 12, for example beat with diagram abridged hammer and give withdrawal force, this steady pin 12 is moved along extracting direction P to steady pin 12.Extract in the operation at this, in the process (distance D) that steady pin 12 is moved on the inner peripheral surface limit CONTACT WITH FRICTION of the outer peripheral face of C shape spring 14 and transverse direction hole 10a, limit, for opposing frictional force is between the two come mobile steady pin 12.At this moment, mud that (part of being represented by arrow A among Fig. 2) filled in pin main body 13 and transverse direction hole 10a, between the end of the sidewall 14a of C shape spring 14 and transverse direction hole 10a etc., by being broken by impact force that strike gave of hammer etc. etc., simultaneously, follow to steady pin 12 to extracting moving of direction P, go out to its external compression from 10a inside, transverse direction hole successively.Like this, shown in Fig. 3 (a), steady pin 12 up to the position of the CONTACT WITH FRICTION of the inner peripheral surface of the outer peripheral face of removing C shape spring 14 and transverse direction hole 10a, moves along extracting direction P.Thereafter, and the contact friction of the mud between pin main body 13 and the transverse direction hole 10a etc., though very small in addition, steady pin 12 is moved along extracting direction P, shown in Fig. 3 (b), can fully extract from transverse direction hole 10a and side

surface part hole

11a, 11a.

In addition, when the insertion operation of carrying out steady pin 12, shown in Fig. 3 (b), so that transverse direction hole 10a and side surface part hole 11a, the state of 11a unanimity, in this two hole the tail side end 12b of steady pin 12, touch the end margin of transverse direction hole 10a at front end up to the sidewall 14b of C shape spring 14, make steady pin 12 move (with reference to Fig. 3 (a)) along direction of insertion Q, then, up to steady pin 12 is inserted this two hole (transverse direction hole 10a and side

surface part hole

11a, 11a), this steady pin 12 for example with the end face of attacking head side end 12a such as hammer, is given extruding force and embeds steady pin 12 (with reference to Fig. 2 (a)).Insert in the operation at this, in the sidewall 14b of the C shape spring 14 of tail side end 12b up to an end margin that touches transverse direction hole 10a, any resistance does not move along direction of insertion Q with all having, and at the inner major part of inserting steady pins 12 of tooth 11 and Connection Block 10 (from the state shown in Fig. 3 (b) to the state shown in Fig. 3 (a)).Like this, can shorten the interval of squeezing into when steady pin 12 usefulness hammers etc. are squeezed into, simultaneously, also can shorten between the protruding segments of a side end 12a of the steady pin 12 of tooth 11 sides, by above these processes, when alleviating the work of squeezing into, when brandishing hammer etc., can fully guarantee necessary space, and reach the simplification of inserting operation with hammer etc.

According to present embodiment, in the insertion operation of steady pin 12 with extract operation no matter in that a kind of situation, opposing is by the frictional force that produces between C shape spring 14 and the transverse direction hole 10a, shorten the distance D that moves and reach, thereby these operations are carried out easily and promptly, can improve the efficient of the loading and unloading exchanging operation of tooth thus.In addition, shown in Fig. 2 (a), by described distance L ₁Than described distance L ₂The significantly shortening of distance, can reach the minimizing of the amount of filling in that direction P constitutes the mud etc. of pull-out resistance of extracting that makes at steady pin 12, thereby can avoid extracting the operation very worry of difficulty that becomes owing to what reason that mud etc. is filled in made steady pin 12.

Present embodiment, be that the amount of the mud that constitutes pull-out resistance extracting on the direction P of steady pin 12 etc. is reduced, and opposing is by the frictional force between C shape spring 14 inner peripheral surfaces that take place and transverse direction hole 10a, from the viewpoint of the shortening of the distance (the mark D Fig. 2 (a)) that makes mobile steady pin 12 and constitute, simultaneously, also be at the structure shown in Fig. 4 (b), that is, also consider with described conventional art in the latter structure interchangeability and constitute.

Claims

1. the fixture construction of the tooth of a digging shovel at tooth with fix on the Connection Block of this tooth and wear through hole respectively, is passed the pin of these through holes and fix described tooth on described Connection Block by insertion;

It is characterized in that: ring-spring is housed at the peripheral part that is formed at the endless groove on the described pin, the pin that this ring-spring is housed is inserted in the through hole of described Connection Block, make the inner peripheral surface of a side end of length direction of the through hole of the outer peripheral face of ring-spring and described Connection Block carry out CONTACT WITH FRICTION.

2. according to the fixture construction of the tooth of the described digging shovel of claim 1, it is characterized in that: described ring-spring is that the cross section with width littler than the width of described endless groove is the spring of C shape.