JP2014031689A - Loader work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a lock completion state of lock means to be more correctly discriminated.SOLUTION: Mounting tools 5 at the tips of left and right booms B have: installation bodies 9 having engaging parts 8 respectively engaging with engaged parts 7 of the work tool G; and a pair of left and right lock means 11 each locking and releasing engagement between the engaging parts 8 and the engaged part 7. Each of the left and right lock means 11 includes: a lock pin 12 which is supported by the installation body 9 such that its tip can emerge/retreat and of which tip protrudes to engage with the engaged part 7 of the work tool G; a lock lever 14 pivotally supported by the installation body 9 via a support pin, pushing/pulling the lock pin 12, and manually operable; and a lock cylinder 16 swinging each of the left and right lock levers 14. A cover 17 for covering the lock cylinder 16 is provided in the installation body 9, and a marginal part E which becomes parallel to a holding part 14A for manual-operating of the lock lever 14 at the time of locking is formed on the cover 17.

Description

  The present invention relates to a loader working machine in which a work tool is detachably mounted.

A loader working machine equipped in a tractor, a wheel loader, a skid loader or the like has a work tool (attachment) detachably attached to the tip of the boom so that the work tool can be replaced.
As disclosed in Patent Documents 1 and 2, this type of loader working machine is detachably mounted on a mounting tool pivotally supported via a horizontal shaft at the ends of a pair of left and right booms. A work tool, and a pair of left and right work tool cylinders that rotate the work tool about a horizontal axis. The work tool has an engaged portion on the back surface, and the mounting tool is covered by the work tool. A mounting body having an engaging portion that engages with the engaging portion; a pair of left and right locking means that are supported by the mounting body and lock and release the engagement between the engaging portion and the engaged portion; And left and right brackets and a connecting member for connecting the left and right brackets.

  Each of the left and right locking means is supported by the mounting body so as to be freely retractable at the tip, and is pivotally supported by the mounting body via a support pin and a locking pin that protrudes from the tip and engages an engaged portion of the work tool. It has a manually operable lock lever that pushes and pulls the lock pin, and a lock cylinder that is provided between the left and right lock levers and swings the left and right lock levers.

JP 2011-99239 A US Pat. No. 5,562,397

In the prior art, a cover that covers the lock cylinder is not provided, and when the left and right lock levers are swung by the lock cylinder, whether the lock lever is in the locked position or the unlocked position is swung. Although it is possible to know, it is difficult to determine whether or not the lock is complete even in the substantially locked posture.
It is an object of the present invention to provide a loader working machine that can solve such problems of the prior art.

  It is an object of the present invention to provide a loader work machine that can more accurately determine the lock completion state of the lock means.

Specific means for solving the problems in the present invention are as follows.
First, a mounting tool 5 pivotally supported at the tips of a pair of left and right booms B via a horizontal shaft 4, a working tool G that is detachably mounted on the mounting tool 5, and a horizontal shaft 4 A pair of left and right work tool cylinders S that rotate around,
The working tool G has an engaged portion 7 on the back surface, and the mounting tool 5 has an attaching body 9 having an engaging portion 8 that engages with the engaged portion 7 of the working tool G, and the mounting body 9. And a pair of left and right locking means 11 for locking and releasing the engagement between the engaging portion 8 and the engaged portion 7.
Each of the left and right lock means 11 is supported by the mounting body 9 so that the tip can be freely retracted, and the tip protrudes to engage the engaged portion 7 of the work tool G, and the mounting body 9 has a support pin 43. A manually-operable lock lever 14 that is pivotally supported and pushes and pulls the lock pin 12, and a lock cylinder 16 that is provided between the left and right lock levers 14 and swings the left and right lock levers 14.
The mounting body 9 is provided with a cover 17 that covers the lock cylinder 16, and the cover 17 is formed with an edge E that is parallel to the manual gripping portion 14A of the lock lever 14 when locked.

Second, the cover 17 has a back surface portion 17a that covers the back surface of the lock cylinder 16 and an upper surface portion 17b that covers the upper surface, and the left and right ends of the back surface portion 17a and the left and right ends of the upper surface portion 17b are connected to the left and right sides of the mounting body 9. It is connected to the side part.
Third, the cover 17 has a back surface portion 17a that covers the back surface of the lock cylinder 16 and an upper surface portion 17b that covers the top surface, and the grip portions 14A of the left and right lock levers 14 enter and leave the left and right upper portions of the back surface portion 17a. The opening E is formed horizontally, the edge E of the opening 18 is formed horizontally, and the side edge 14Aa of the gripping portion 14A at the time of locking is arranged at a position coincident with the edge E of the opening 18 It is characterized by being.

Fourth, the mounting body 9 includes a bracket 10A that supports the horizontal shaft 4 on the outer side in the left-right direction of the left-right locking means 11, and a connecting rod 9B that connects the left-right bracket 10A.
Each of the left and right lock levers 14 extends from the support pin 43 in a direction intersecting the gripping portion 14A, is connected to the lock pin 12 and the lock cylinder 16, and contacts the bracket 10A when locked, and the support pin 43. The projecting end 14B protrudes in the opposite direction from the working end 14B, and the projecting end has a release end 14C that comes into contact with the bracket 10A when unlocked.

According to the present invention, the lock completion state of the lock means can be made more accurate.
That is, according to the first aspect of the invention, the lock lever 14 that is swung by the lock cylinder 16 when the edge E of the cover 17 that covers the lock cylinder 16 and the manual gripping portion 14A of the lock lever 14 are parallel to each other. The lock completion state X can be determined.
In the invention according to claim 2, since the left and right ends of the back surface portion 17a and the upper surface portion 17b of the cover 17 are connected to the left and right side portions of the mounting body 9, the strength of the mounting body 9 can be improved.

In the invention according to claim 3, the cover 17 is formed with an opening 18 at the upper part on the left and right sides, the edge E is formed horizontally, and the side edge 14Aa of the gripping part 14A when locked is the edge of the opening 18. Since it is arranged at a position that coincides with E, it is possible to more accurately determine the lock completion state X by the gripping portion 14A.
In the invention according to claim 4, each of the left and right lock levers 14 can be brought into an accurate lock completion state X because the working end portion 14B abuts on the bracket 10A of the mounting body 9 when locked, and the release end portion 14C is the bracket when releasing the lock. Since it is in contact with 10A, it can be in an accurate unlocking completion state Y.

It is a perspective view of the principal part of the loader work machine which shows embodiment of this invention. It is a rear view of the principal part of the loader working machine of a working tool mounting state. It is a rear view of a mounting tool. It is a perspective view of a mounting tool. It is a side view of a mounting tool. It is a perspective view of the principal part of a mounting tool. It is a whole perspective view of a loader work machine. It is a whole side view of a loader work machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
7 and 8, the loader working machine F is illustrated as a front loader attached to the traveling vehicle body 20. The tractor as the traveling vehicle body 20 has a transmission case connected to the rear part of the engine, a front frame protrudes forward from the engine, a front wheel is suspended on the front frame, and a bonnet that covers the engine is mounted. A front loader mounting frame 27 is attached to the left-right part.

The mounting frame 27 fixes a cylindrical mounting cylinder 27B from the mounting plate 27A bolted from the engine to the transmission case to the left and right, and a support plate 27C is erected from the outer end of the mounting cylinder 27B. The receiving plate 27C is provided with a receiving recess 28a in the middle of the upper and lower portions and an upper mounting pin hole 28b.
The front loader F includes left and right side frames 29, a boom B whose base is pivotally supported on the upper part of the left and right side frames 29 via a pivot 30, a front and rear midway part of the left and right booms B, and a lower part of the side frame 29. A boom cylinder 31 connected between them, a mounting tool 5 pivotally supported at the tip of the left and right boom B via a horizontal shaft 4, and a work tool (bucket) G detachably mounted on the mounting tool 5. And a work tool cylinder (bucket cylinder) S provided between the front and rear middle parts of the left and right booms B and the mounting tool 5.

Each of the left and right side frames 29 has a pin-like engaging portion 32 provided at the lower end engaged with a receiving concave portion 28a of the receiving plate 27C, and a connecting pin hole provided in the upper and lower middle portion and a mounting pin hole of the receiving plate 27C. The mounting pin 33 is inserted into the mounting frame 27 so as to be detachably mounted.
The boom B is shaped like a side view, and a pair of left and right is connected by an intermediate connecting member Ba, and a lower portion of the mounting tool 5 is pivotally supported at the tip of the left and right boom B via a horizontal shaft 4. The midway portion is connected to the tip of the cylinder rod of the work tool cylinder S via the push / pull link 34 </ b> A and the support shaft 6. One end of the push / pull link 34A and one end of the control link 34B are connected to the tip of the cylinder rod of the work tool cylinder S, and the other end of the control link 34B is connected to the boom B.

  1 to 8, a work tool G is detachably mounted on the mounting tool 5, and the work tool mounting apparatus 2 is configured by these. Each of the left and right work tool cylinders S is disposed opposite to the front upper side of each of the left and right booms B, and rotates the mounting tool 5 around the horizontal axis 4 by an expansion / contraction operation so that the bottom surface of the work tool G shown in FIG. From the posture, the scooping operation is performed by contracting, and the dumping operation is performed by expanding and contracting.

In the embodiment, the vertical direction and the front-back direction are based on FIG. 8 in which the bottom wall G1 of the work tool G is grounded.
The working tool G exemplifies a bucket, and the bucket has a bottom wall G1, a back wall G2, and side walls G3 at both left and right ends thereof, and an upper plate 35 extending over substantially the entire width is provided on the upper portion. A backing plate 36 and a guide plate 37 are provided on the left and right sides of the back surface of G2, and a lower plate 38 is provided from the bottom wall G1 to the lower portion of the backing plate 36 on the back wall G2.

The work tool G has an engaged portion 7 on the back surface of the back wall G2. The engaged portion 7 has an upper engaged portion 7U formed on the left and right sides by the upper plate 35 projecting rearward and downward from the upper portion of the abutting plate 36, and the lower portion of the abutting plate 36 is bent and rearwardly lowered. The lower engaged portion 7 </ b> D is formed by projecting to the bottom.
The left and right guide plates 37 are disposed on the left and right outer sides of the left and right abutting plates 36, and the rear part is inclined so as to widen backward, so that the left and right positions of the mounting tool 5 approaching the guide plate 37 from behind are guided.

The mounting tool 5 is attached to the back surface of the work tool G and has an engaging portion 8 that engages with the engaged portion 7, and is provided on the back surface of the mounting body 9, and the horizontal shaft 4 A pair of left and right connecting portions 10 to be supported and a pair of left and right locking means 11 that are supported by the mounting body 9 and lock and release the engagement between the engaging portion 8 and the engaged portion 7 are provided.
The mounting body 9 may be formed as a single plate having a lateral width extending between the left and right abutting plates 36, but here, a pair of left and right attachment plates 9A formed to have a lateral width facing the left and right abutting plates 36, The left and right attachment plates 9A are provided with left and right brackets 10A and pipe connection rods (connection members) 9B connected through the left and right brackets 10A across the left and right attachment plates 9A. .

By connecting the left and right contact plates 9A with a connecting rod (connecting member) 9B made of a pipe, the left and right contact plates 9A are configured so as to be lighter and higher in strength than a single plate of full width.
The attachment plate 9A has an upper engagement portion 8U bent at the upper portion and entering the lower surface side of the upper engaged portion 7U, and a lower portion bent at the wedge shape. The lower engaged portion 8D is formed on the upper surface side of the lower engaged portion 7D and engaged therewith, and the lower engaged portion 7D is locked at a position deviated from the overlapping position with the lower engaged portion 8D. A pin hole 39a is formed. A lock pin hole that matches the lock pin hole 39a may be formed in the lower engagement portion 8D.

  A connecting portion 10 is formed on the left and right brackets 10A. The connecting portion 10 is formed with a boss portion that supports both ends of the horizontal shaft 4 at the lower portion of the left and right bracket 10A, and the tip of the boom B is inserted between the left and right boss portions so as to be fitted to the horizontal shaft 4. A boss portion that supports both ends of the support shaft 6 is formed in the middle portion in the vertical direction, and a push / pull link 34A is inserted between the left and right boss portions so as to be fitted to the support shaft 6. The horizontal shaft 4 and the support shaft 6 are arranged vertically with a connecting rod 9B interposed therebetween.

  Each of the left and right locking means 11 is disposed on the inner side in the left and right direction of the pair of left and right brackets 10A, and a lock pin 12 is supported by a cylindrical guide 40 fixed to the back surface of the attachment plate 9A so as to be movable up and down. The lower part of the link 13 is connected to the upper part via a pin 12a, a sliding member 41 is provided on the upper part of the link 13, a spring 42 is fitted in the middle part of the link 13, and the pin part 41a of the sliding member 41 is provided. The upper and lower middle portions of the operating end portion 14B of the lock lever 14 are connected to each other, and a hydraulically operated lock cylinder 16 is connected to the lower end of the operating end portion 14B of the lock lever 14 via a pin 44.

The lock lever 14 is pivotally supported by a support pin 43 fixed to the attachment plate 9A, and the left and right lock levers 14 are disposed at a position where one operator can perform manual swing operation simultaneously with both left and right hands. Remote operation is possible by 16 telescopic operations.
Each of the left and right lock levers 14 is substantially L-shaped when viewed from the back, and a center bent portion is supported by a support pin 43, and a gripping portion 14A protruding from the support pin 43 toward the left and right center side of the mounting body 9; The working end portion 14B extending in a direction (downward) orthogonal to the gripping portion 14A and connected to the lock pin 12 and the lock cylinder 16, and a release projecting from the support pin 43 in the direction opposite to the working end portion 14B. It has an end 14C.

The working end portion 14B has a connection point (pin portion 41a) to the link 13 and a connection point (pin 44) to the lock cylinder 16 separated from each other vertically, and the lower end abuts on the bracket 10A when locked, Lock completion (lock completion state X) is set, and further extension of the lock cylinder 16 is restricted.
Further, the release end portion 14C comes into contact with the bracket 10A at the time of unlocking, sets unlock completion (lock release completion state Y), and restricts further contraction of the lock cylinder 16. 14 A of said holding parts are bent in the direction which the front end side from the support pin 43 leaves | separates from 9 A of attachment plates.

The state shown by the two-dot chain line in FIG. 2 is the unlocking completion state Y in which the grip 14A at the other end of the lock lever 14 protrudes from the mounting body 9, and the state shown by the solid line inside the mounting body 9 is locked. Completed state X.
By swinging the lock lever 14 from the unlocking completion state Y, one end of the lock lever 14 pushes the link 13 while compressing the spring 42 via the sliding member 41, lowers the lock pin 12, and locks. The tip of the pin 12 protrudes from the tube guide 40 and the lower engaging portion 8D and is inserted into the lock pin hole 39a of the lower engaged portion 7D, thereby preventing the lower engaged portion 7D from being detached from the lower engaging portion 8D. Then, the mounting of the work tool G is locked.

When the lock lever 14 is set to the lock completion state X, the end portion of the working end portion 14B passes through the center line of the pin 12a and the support pin 43 and comes into contact with one bracket 10A. Is retained. Note that the sliding member 41 may contact the bracket 10A instead of the working end portion 14B itself.
A cover 17 that covers the lock cylinder 16 is provided between the pair of left and right brackets 10A. The cover 17 has a back surface portion 17 a that covers the back surface of the lock cylinder 16, and an upper surface portion 17 b that projects forward from the upper end of the back surface portion 17 a and covers the upper surface of the lock cylinder 16.

  The lower portions of the left and right ends of the back surface portion 17a of the cover 17 are bolted to stays 48 provided at the lower portion of the bracket 10A, and the left and right ends of the upper surface portion 17b are bolted to stays 49 provided at the upper portion of the attachment plate 9A. The back surface portion 17a is coupled with the connecting rod 9B to restrict the left and right brackets 10A from receiving the expansion and contraction force of the lock cylinder 16 and to bend around the connecting portion with the connecting rod 9B, and the upper surface portion 17b is connected to the connecting rod 9B. Coupled with the flange 9B, the connection strength of the left and right attachment plates 9A is increased.

  The cover 17 has, on the left and right side portions, openings 18 through which the gripping portions 14A of the left and right lock levers 14 enter and exit from the upper portion of the back surface portion 17a to the upper surface portion 17b. The opening 18 is cut horizontally from the left and right sides of the cover 17, and the upper and lower edges E are formed horizontally. The gripping part 14A when locked is located in the opening 18 and the side edge 14Aa is It becomes parallel to the edge E. In addition, the lock lever 14 can be disposed at a position where the side edge 14Aa at least above the upper and lower edges of the gripping part 14A at the time of locking is parallel to and coincides with the horizontal edge E. 14A is arranged and formed.

  When the gripping portion 14A of the lock lever 14 is aligned with the horizontal edge E, the working end portion 14B is in contact with the bracket 10A, and the tip of the lock pin 12 is inserted into the lock pin hole 39a of the lower engaged portion 7D. The working tool G is set in the lock completion state X. Whether the grip 14A of the lock lever 14 is in a state coincident with or close to the edge E is obvious when viewed from the traveling vehicle body 20 side, and the lock completion state X is more accurately and easily determined. it can.

In a state where the lock lever 14 is unlocked, the gripping portion 14A protrudes greatly from the opening 18 and protrudes upward from the upper edges of the mounting tool 5 and the work tool G, and this is also obvious when viewed from the traveling vehicle body 20 side. Yes, it can be determined accurately and easily from the unlocking completion state Y.
The part of the cover 17 that compares the posture with the grip 14A of the lock lever 14 may be other than the upper and lower edges of the opening 18, for example, the front and rear edges of the upper surface part 17b.

  As shown in FIG. 8, the work tool mounting work in the work tool mounting apparatus 2 is performed by moving the mounting tool 5 to the back side of the work tool G by lowering the boom B while the work tool G is grounded. In the state in which the lock lever 14 is unlocked, the upper engaging portion 8U is engaged with the left and right upper engaged portions 7U from the lower side, and the upper engaging portion 8U is further raised to lift the work tool G. As a result, the lower engagement portion 7D of the work tool G is engaged in proximity to the lower engagement portion 8D.

  With the left and right upper engaged portions 7U and the lower engaged portions 7D engaged with the left and right upper engaged portions 8U and the lower engaged portions 8D, the lock cylinder 16 is extended, and the left and right lock levers 14 are illustrated. 2 is swung from the two-dot chain line position to the solid line position in FIGS. 1 to 4, the tip of the lock pin 12 is inserted into and engaged with the lock pin hole 39 a of the lower engaged portion 7 </ b> D. G is attached and locked, and the gripping portion 14A of each of the left and right lock levers 14 is parallel to the horizontal edge E of the opening 18, and the lock completion state X is displayed.

In the present invention, the shape of each member and the positional relationship between the front, back, left, and right in the above embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, the work tool G may be a fork, a thumb or the like in addition to a bucket, and the boom B may be a wheel loader, a skid loader, a tractor loader backhoe or the like.

In each of the left and right connecting portions 10, the locking means 11 may be disposed between the left and right brackets 10A, or the support shaft 6 may be disposed outside the pair of left and right brackets 10A.
The lock lever 14 may be disposed on the outer side of the cover 17 and the posture may be compared between the gripping portion 14 </ b> A and the edge of the upper surface portion 17 b of the cover 17.

DESCRIPTION OF SYMBOLS 2 Work tool mounting apparatus 4 Horizontal axis 5 Mounting tool 6 Support shaft 7 Engagement part 7D Lower engagement part 7U Upper engagement part 8 Engagement part 8D Lower engagement part 8U Upper engagement part 9 Attachment body 9A attachment Contact plate 9B Connecting rod 10 Connecting portion 10A Bracket 11 Locking means 12 Lock pin 14 Lock lever 14A Holding portion 14Aa Side edge 14B Working end portion 14C Release end portion 16 Lock cylinder 17 Cover 17a Back surface portion 17b Upper surface portion 18 Opening portion 20 Traveling vehicle body (Tractor)
43 Support pin B Boom E Edge F Loader working machine (front loader)
G Work implement (bucket)
S Work tool cylinder X Lock complete state Y Lock unlock complete state

Claims (4)

A mounting tool (5) pivotally supported at the tips of a pair of left and right booms (B) via a horizontal shaft (4), a work tool (G) detachably mounted on the mounting tool (5), and this work A pair of left and right work tool cylinders (S) for rotating the tool (G) about the horizontal axis (4),
The working tool (G) has an engaged portion (7) on the back surface, and the mounting tool (5) is an engaging portion (8) engaged with the engaged portion (7) of the working tool (G). ) And a pair of left and right locking means that are supported by the mounting body (9) and lock and release the engagement between the engaging portion (8) and the engaged portion (7). 11)
Each of the left and right locking means (11) is supported by the mounting body (9) so that the tip can be freely moved, and the tip projects from the lock pin (12) engaged with the engaged portion (7) of the work tool (G). And a manually operable lock lever (14) pivotally supported on the mounting body (9) via a support pin (43) and pushing and pulling the lock pin (12), and a left and right lock lever (14). And a lock cylinder (16) that swings the left and right lock lever (14).
The mounting body (9) is provided with a cover (17) that covers the lock cylinder (16), and an edge (parallel to the manual gripping part (14A) of the lock lever (14) at the time of locking is provided on the cover (17) ( A loader working machine characterized by forming E).   The cover (17) has a back surface portion (17a) that covers the back surface of the lock cylinder (16) and an upper surface portion (17b) that covers the upper surface, and the left and right ends of the back surface portion (17a) and the upper surface portion (17b). The loader working machine according to claim 1, wherein both left and right ends are connected to left and right sides of the mounting body (9).   The cover (17) has a back surface portion (17a) that covers the back surface of the lock cylinder (16) and an upper surface portion (17b) that covers the upper surface, and left and right lock levers (14) on the upper left and right sides of the back surface portion (17a). ) Has an opening (18) for entering and exiting, and the edge (E) of the opening (18) is formed horizontally, and the side edge of the gripping part (14A) when locked The loader working machine according to claim 1, wherein (14Aa) is arranged at a position coinciding with the edge (E) of the opening (18). The mounting body (9) has a bracket (10A) for supporting the horizontal axis (4) on the outer side in the left-right direction of the left-right locking means (11), and a connecting rod (9B) for connecting the left-right bracket (10A). And
Each of the left and right lock levers (14) extends from the support pin (43) in a direction intersecting with the gripping part (14A) and is connected to the lock pin (12) and the lock cylinder (16) to lock the bracket (10A). And a release end (14C) projecting from the support pin (43) in the opposite direction to the action end (14B), and the projected end abutting the bracket (10A) when unlocked. The loader working machine according to any one of claims 1 to 3, wherein the loader working machine is provided.

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