JP5285990B2 - Dozer equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide bulldozer equipment capable of transmitting telescopic force of a tilt cylinder to tilt swinging of a blade efficiently. <P>SOLUTION: In this bulldozer equipment, a bulldozer frame 3 elevating and lowering through a bulldozer cylinder S1 is pivotally supported on a traveling machine body 2 through a horizontal shaft X, a supporting body 4 swinging forward and backward through an angle cylinder S2 is pivotally supported on the bulldozer frame 3 through a vertical shaft Y, and the blade 5 swinging vertically through a tilt cylinder S3 is pivotally supported on the supporting body 4 through a fore-and-aft shaft Z. The tilt cylinder S3 connects a tip of a cylinder rod S3a with the blade 5 above the fore-and-aft shaft Z and connects a bottom of a cylinder tube S3b with an arm part 4A being apart from the fore-and-aft shaft Z more than the cylinder rod S3a and protruding outward in the right and left directions of the supporting body 4. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a tilter / angle swingable dozer device mounted on a work machine such as a backhoe.

In this type of prior art, as disclosed in Patent Documents 1 and 2, a dozer frame that moves up and down via a dozer cylinder is pivotally supported on a traveling machine body via a horizontal axis, and an angle cylinder is mounted on the dozer frame. A support body that swings back and forth is pivotally supported via a vertical axis, and a blade that swings up and down via a tilt cylinder is pivotally supported on the support body via a front-rear axis.
In the tilt cylinder, the bottom side of the cylinder tube is connected to the support in the vicinity of the vertical axis or directly above the vertical axis, and the tip of the cylinder rod is connected to the blade away from the vertical axis and the longitudinal axis.
JP 2001-164597 A Japanese Patent Application Laid-Open No. 61-162939

The tilt cylinder has a narrower angle formed by its axis with respect to the center line connecting the front and rear axes and the connecting point of the tip of the cylinder rod. In the techniques of Patent Documents 1 and 2, the included angle is extremely small, and it is difficult to efficiently transmit the expansion / contraction force of the tilt cylinder to the tilt swing of the blade.
SUMMARY OF THE INVENTION An object of the present invention is to provide a dozer device that can solve such problems of the prior art.

  In the present invention, the tip of the cylinder rod of the tilt cylinder is connected to the blade above the longitudinal axis, and the bottom of the cylinder tube is connected to a position far from the arm portion of the support so that the expansion / contraction force of the tilt cylinder is adjusted to tilt the blade. An object of the present invention is to provide a dozer device that can efficiently transmit motion.

Specific means for solving the problems in the present invention are as follows.
First, a dozer frame 3 that moves up and down via a dozer cylinder S1 is pivotally supported on a traveling machine body 2 via a horizontal axis X, and a support body 4 that swings back and forth via an angle cylinder S2 is vertically supported on the dozer frame 3. The blade 5 pivoted through the axis Y and pivoted up and down via the tilt cylinder S3 is pivotally supported by the support 4 via the longitudinal axis Z.
In the tilt cylinder S3, the tip of the cylinder rod S3a is connected to the blade 5 above the longitudinal axis Z, and the bottom of the cylinder tube S3b is further away from the longitudinal axis Z than the cylinder rod S3a. It is connected to the arm portion 4A projecting toward the top.

Second, the tilt cylinder S3 connects the tip of the cylinder rod S3a to the upper part of the blade 5, and connects the bottom of the cylinder tube S3b to the upper surface of the arm part 4A of the support body 4,
The front-rear axis Z is located immediately below the lower part of the vertical axis Y, and the tilt cylinder S3 is located immediately above the front-rear axis Z.
Thirdly, the tilt cylinder S3 allows the hydraulic hose 9 connected to the cylinder tube S3b to pass above the longitudinal axis Y, so that the side of the dozer frame 3 opposite to the arrangement of the cylinder tube S3b in the left-right direction. It is characterized by extending over the part.

Fourth, the support body 4 has a sliding portion 4B facing the blade 5 at the tip of the arm portion 4A, and allows the blade 5 to swing up and down between the sliding portion 4B and the back surface of the blade 5. While providing a guide member 6 that regulates the front separation,
The bottom of the cylinder tube S3b is pivotally supported at the tip of an arm portion 4A having the sliding portion 4B.
[Action]
The dozer device having the above-described features has the following effects.

When the angle cylinder S2 is operated, the support 4 swings back and forth (angle swing) about the longitudinal axis Y, and when the tilt cylinder S3 is operated, the blade 5 swings up and down (tilt swing) about the front and rear axis Z. )
In the tilt cylinder S3, the tip of the cylinder rod S3a is connected to the blade 5 above the longitudinal axis Z, and the bottom of the cylinder tube S3b is further away from the longitudinal axis Z than the cylinder rod S3a. Is connected to the arm portion 4A protruding to the center, and the angle formed by the axis of the angle cylinder S2 with respect to the center line connecting the longitudinal axis Z and the connecting point at the tip of the cylinder rod S3a is such that the cylinder rod S3a is connected to the cylinder tube. It becomes larger than the case of being away from the front-rear axis Z than the bottom of S3b, and the expansion / contraction force of the angle cylinder S2 can be made to act efficiently.

The front-rear axis Z is located immediately before the lower part of the vertical axis Y, the tilt cylinder S3 is located immediately above the front-rear axis Z, and the front-rear axis Z, the vertical axis Y, and the tilt cylinder S3 are compactly arranged in the front-rear direction and the vertical direction. Thus, the cylinder expansion / contraction force for tilting and swinging the blade 5 around the longitudinal axis Z can be transmitted efficiently.
By extending the hydraulic hose 9 on the side of the dozer frame 3 opposite to the arrangement of the cylinder tube S3b, the bending of the hydraulic hose 9 can be increased, and the movement of the hydraulic hose 9 when the tilt cylinder S3 is operated can be reduced. .

  The cylinder tube S3b of the tilt cylinder S3 can be pulled away from the longitudinal axis Z, and the tip of the cylinder rod S3a can be disposed close to the longitudinal axis Z.

  According to the present invention, the expansion / contraction force of the tilt cylinder can be efficiently transmitted to the tilt swing of the blade.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 11, reference numeral 1 denotes a dozer device called a tilt / angle dozer device , which is attached to a front portion of a traveling machine body 2 such as a backhoe.
The dozer device 1 pivotally supports a dozer frame 3 on a traveling machine body 2 via a horizontal axis X, and rotates around the horizontal axis X by a dozer cylinder S1 so that the dozer frame 3 can be raised and lowered. The support 4 is pivotally supported via a vertical axis Y (angle fulcrum shaft), and is rotated about the vertical axis Y by an angle cylinder S2 so that the support 4 can swing back and forth (angle swing). 4, the blade 5 is pivotally supported via a front-rear axis Z (tilt fulcrum shaft), and is rotated about the front-rear axis Z by a tilt cylinder S3 so that the blade 5 can swing up and down (tilt swing). .

1, 2, 4 and 6-9, the dozer frame 3 has a front member 16 that connects the front ends of a pair of left and right main members 15 that are long in the front-rear direction. Are connected to each other by connecting members 18, and cylinder rods of the dozer cylinder S1 are connected to this connecting member 18, and one of the pair of left and right main members 15 (right main member) is connected. A bracket 19 is fixed, and the cylinder tube of the angle cylinder S2 is pin-connected to the bracket 19.
The main member 15 is a rectangular tube, the connecting member 18 is a cylindrical body, the front member 16 is formed in a U-shaped cross section, and the vertical bearing member 17 is disposed in front of the main member 15 and the front member 16 in front. A face plate 17a is fixed, a pair of upper and lower plane-view substantially triangular plates 17b are fixed to the front surface of the front plate 17a, and a cylindrical body 17c through which the vertical axis Y is inserted is fixed to the top of the triangular plate 17b. It is configured.

An angle cylinder S2 pivotally supported by the bracket 19 is disposed on the outer side of one (right main member) of the main member 15, whereas the tilt cylinder S3 is connected on the upper side of the other (left main member). A hydraulic hose 9 and a side hose cover 10S that covers the hydraulic hose 9 are disposed, and a fitting 20 is provided for positioning the hydraulic hose 9 and attaching the side hose cover 10S.
The support 4 connects an upper plate 4u and a lower plate 4d by a vertical plate-like front plate 4f and a rear plate 4r, and a vertical axis Y is inserted into each rear protrusion of the upper plate 4u and the lower plate 4d. The upper and lower boss members 4a are fixed, and the front and rear bearing members 21 for pivotally supporting the front and rear axis Z are fixed to the lower plate 4d, the front plate 4f, and the rear plate 4r.

As shown in FIGS. 2 and 4, the front / rear bearing member 21 is located on the front side of the lower boss member 4a, and therefore the front / rear axis Z is located on the front side of the vertical axis Y. The axis Z of the axis Z is located on a common vertical plane. The axis ZP of the longitudinal axis Z is located below the vertical center of the vertical axis Y or the vertical center H of the cylindrical body 17c of the vertical bearing member 17, and the longitudinal axis Z is close to the lower part of the vertical axis Y. Opposite.
1 to 9, the support body 4 has left and right arm portions 4A projecting from the left and right central portions where the boss members 4a and the front and rear bearing materials 21 are disposed, and the front surfaces of the outer ends of the left and right arm portions 4A are forward. It protrudes and the sliding part 4B is formed in this protrusion end.

Each of the left and right sliding portions 4B is formed by fixing a flat plate to the front projecting end of the arm portion 4A. The sliding portion 4B has a front face facing the blade 5 and is separated from the longitudinal axis Z in the radial direction. The outer peripheral edge 4Ba and the inner peripheral edge 4Bb are formed in an arc shape centered on the front-rear axis Z.
The outer end of the left and right (right) arm portion 4A protrudes rearward, and an angle pin 22 to which the cylinder rod S2a of the angle cylinder S2 is connected is attached. A rod cover 23 is connected to the cylinder rod S2a of the angle cylinder S2, and is fitted to the cylinder tube S2b so as to be slidable in the longitudinal direction. In the angle cylinder S2, the cylinder tube S2b and the hydraulic hose connected thereto are protected by a tube cover 24 provided on the main member 15.

The angle cylinder S2 is pivotally supported at the front-rear center or rear side of the dozer frame 3 and is disposed at the side of the dozer frame 3, so that the angle pin 22 can be used even if a cylinder having a necessary and sufficient stroke is used. Can be arranged close to the longitudinal position of the vertical axis Y, and the longitudinal dimension of the support 4 can be shortened.
In addition, the angle of the angle cylinder S2 with respect to the center line connecting the vertical axis Y and the angle pin 22 is made close to a right angle, so that the expansion / contraction force of the angle cylinder S2 can be transmitted to the support 4 efficiently.

The support 4 is provided with a cylinder support 28 on the upper surface of the outer end of one of the left and right (right) arms 4A. The bottom of the cylinder tube S3b of the tilt cylinder S3 is pivotally supported on the cylinder support 28 via a base shaft 29. The tip of the cylinder rod S3a of the tilt cylinder S3 is pivotally connected to a rod support 30 fixed to the back surface of the blade 5 via a connecting pin 31.
The tilt cylinder S3 is shifted from the left and right center of the support 4 to one side (right side), and the rod support 30 is shifted from the left and right center to the opposite side of the tilt cylinder S3 at the upper part of the back surface of the blade 5. The cylinder rod S3a is located directly above the front-rear axis Z.

  As shown in FIG. 5, when the blade 5 is horizontal, the tilt cylinder S3 is tilted so that the cylinder rod S3a is up, and the center line K connecting the front-rear axis Z and the connecting pin 31 is tilted to the left in the rear view. The tilt angle L between the tilt cylinder S3 and the center line K is smaller than a right angle, but the front and rear axis Z is below the vertical center of the blade 5, so the sandwich angle L is larger than when it is above and Since the horizontal distance from the axis YP of the shaft Y to the connecting pin 31 is shorter than that of the base shaft 29, the included angle L can be made closer to a right angle, the rotation angle around the base shaft 29 can be reduced, and the tilt cylinder S3 The expansion / contraction force can be efficiently transmitted to the blade 5. Further, when the included angle L is made close to a right angle, the vertical swing of the tilt cylinder S3 during tilt swing is reduced, and the movement of the hydraulic hose 9 can be reduced.

As shown in FIG. 9, the hydraulic hose 9 connected to the cylinder tube S3b of the tilt cylinder S3 passes above the vertical axis Y and is opposite to the arrangement (right side) of the cylinder tube S3b in the left-right direction. The hydraulic hose 9 can be gently bent by being extended on the side portion (the left main member 15) of the dozer frame 3 and having a distance from the side portion of the dozer frame 3 to the cylinder tube S3b. Yes.
1 to 11, the blade 5 includes a back body 5A supported by the longitudinal axis Z, and a blade body 5B fixed to the front surface of the back body 5A and having an upper portion covering the upper edge of the back body 5A. . The back body 5A and the blade body 5B include a middle reinforcing member 5C having a U-shaped cross section that reinforces the connection therebetween, and a lower reinforcing member that connects and reinforces the lower ends of the back body 5A and the blade body 5B. 5D and an upper reinforcing material 5E for connecting and reinforcing the upper ends of the back body 5A and the middle reinforcing material 5C. These back body 5A, blade body 5B, middle reinforcing material 5C, lower reinforcing material 5D and upper Side plates 5F are fixed to the left and right ends of the reinforcing material 5E.

A blade edge 33 is detachably mounted on the lower front surface of the blade body 5B. The blade edge 33 is divided into a plurality of right and left parts (two parts), each of which is detachably fixed by a fastener such as a bolt or a countersunk screw penetrating the lower part of the blade body 5B and the lower reinforcing member 5D. The blade edge 33 can be used by replacing the other side edge by turning upside down when worn by using one side edge as the lower edge.
The blade edge 33 has a lower edge protruding downward from the lower edge of the blade body 5B, and is a member that contacts the ground and scrapes off the soil. The lower reinforcing member 5D is provided with a plurality of ribs 5Db on the back surface of the plate member 5Da having a U-shaped cross section at intervals in the left-right direction. In FIG. 2, additional ribs 5Dc are fixed to the ribs 5Db.

The additional rib 5Dc of FIG. 2 protrudes downward from the lower edge of the plate material 5Da and the blade body 5B, and is in contact with the back surface of the blade edge 33. The lower edge of the blade edge 33 is the blade body 5B. Even if it protrudes downward from the lower edge, the lower end of the additional rib 5Dc is backed up.
The additional rib 5Dc may be welded to the rib 5Db or may be bolted. By backing up the additional rib 5Dc, the blade edge 33 may protrude largely downward from the lower edge of the blade body 5B. It becomes possible.

Further, the rib 5Db may extend downward at its lower portion like the additional rib 5Dc and back up the lower end of the blade edge 33 at its lower end.
The front surface of the blade body 5B is formed as an arc concave surface with a horizontal axis as the center of curvature, and the upper portion is formed with an upper portion 5Bb that is horizontal via a rounded portion 5Ba. The horizontal upper portion 5Bb is inclined forward of the rear body 5A. The overlap is arranged so as to cover the upper portion 5Aa of the posture.
As shown in FIGS. 2, 7, 9, and 10, a seat plate 34 is fixed to the lower portion of the back body 5A of the blade 5 in the left-right direction, and through holes 34a are respectively formed in the seat plate 34 and the back body 5A. And support holes 5Ab are formed.

The front and rear shaft Z is provided with a mounting flange Za on the front side. The mounting flange Za is bolted to the seat plate 34, and the front end of the front and rear shaft Z passes through the through hole 34a and supports the support. It is supported by the hole 5Ab.
Therefore, the front / rear axis Z is fixed to the rear body 5A so as to protrude rearward, and is rotatably supported by the front / rear bearing member 21 of the support 4.
The rod support 30 that connects the tip of the cylinder rod S3a of the tilt cylinder S3 is fixed to the upper part 5Aa of the back body 5A in the forward tilting posture, and is approximately the same amount as the front-rear axis Z from the back body 5A. It protrudes rearward and can be arranged so that the cylinder rod S3a and the front-rear axis Z intersect each other in plan view.

1-4 and 8, a cover member 8 that covers the upper side of the tilt cylinder S3 is attached to the upper part 5Aa of the back body 5A. The central cover portion 8A of the cover member 8 has a mountain shape in side view with raised front and rear intermediate portions, and is bolted to the upper portion 5Aa via stays 35 provided at both ends.
The cover member 8 includes a central cover portion 8A that covers the tilt cylinder S3, and an extended cover portion 8B that extends from the central cover portion 8A and covers the left and right sliding portions 4B and the left and right inner and outer guide members 6 described later from above. And have.

The front edge 8a of the cover member 8 is disposed behind the upper part 5Aa and below the horizontal upper part 5Bb of the blade body 5B. The upper part 5Ab is provided with a receiving member 25 for receiving the front edge 8a. . The receiving member 25 is formed by forming a strip with a V-shaped cross section, and is longer than the length of the left and right guide members 6, and prevents the earth and sand from falling from the front edge 8a to the guide member 6 side. Further, deformation of the cover member 8 is also prevented.
The cover member 8 is protected by the horizontal upper part 5Bb of the blade body 5B so that the obstacle does not collide with the front edge 8a even if there is an obstacle over the upper end of the blade body 5B. Even if the cover member 8 collides with an intermediate mountain part, the damage is less than when it collides with the front edge 8a.

A central cover portion 8A of the cover member 8 projects rearward to the vicinity of the vertical axis Y, and a front hose cover 10F that covers the hydraulic hose 9 is attached to the front member 16 of the dozer frame 3 so as to face the central cover portion 8A. The front hose cover 10F includes a central portion 10Fa covering the upper side of the vertical axis Y, and a side portion 10Fb extending from the central portion 10Fa to the side and connected to the side hose cover 10S.
A rising marker 40 is provided at the front end of the center portion 10Fa of the front hose cover 10F, and a pointer marker 41 is provided at the center of the center cover portion 8A of the cover member 8 so as to face the rising marker 40. The corner indicator 11 is constituted by the marker 40 and the pointer marker 41. The central cover portion 8A is positioned higher than the central portion 10Fa so that it does not collide even if it is operated at an angle.

The angle indicator 11 is disposed on a plane that substantially passes through both the longitudinal axes YP and ZP of the longitudinal axis Y and the longitudinal axis Z, and the rising marker 40 is parallel to the longitudinal axis YP of the longitudinal axis Y and has the longitudinal axis Y. Projecting upward, the pointer marker 41 is positioned in front of the rising marker 40 and parallel to the axis YP of the vertical axis Y, and an inclined portion 41b inclined forward and upward from the upper end of the vertical portion 41a. have.
When the blade 5 swings left and right around the vertical axis Y (angle swing), the angle indicator 11 swings the inclined portion 41b of the pointer marker 41 around the rising marker 40, and the swing angle thereof in plan view. When the blade 5 swings up and down around the longitudinal axis Z (tilt swing), the vertical portion 41a and the inclined portion 41b of the pointer marker 41 swings so as to fall from the rising marker 40, and is viewed from the back. The tilt angle can be detected from the swing angle (as viewed from the traveling machine body 2 side).

If the pointer marker 41 is formed of only the vertical portion 41a, only the angle angle can be detected, and if only the inclined portion 41b or this portion is formed horizontally, only the tilt angle can be detected. In addition, it is preferable that the rising marker 40 and the pointer marker 41 of the corner display 11 are colored with each other or with a color different from that of the cover member 8 and the front hose cover 10F so as to be easily recognized.
1 to 11, a pair of substrates 7 are fixed to the back of the blade 5 on the left and right sides with the front-rear axis Z as a center, and relative to the left and right substrates 7 with the sliding portion 4B at the tip of the arm portion 4A. A guide member 6 that restricts the front separation of the blade 5 while allowing vertical swinging is provided. The substrate 7 is in contact with the sliding portion 4B to back up, and transmits a pushing force when the blade 5 is advanced.

The guide member 6 is engaged with each of the substrates 7 in an outer peripheral guide member 6A that engages with the outer peripheral edge 4Ba of the sliding portion 4B in the radial direction of the longitudinal axis Z, and with the inner peripheral edge 4Bb of the sliding portion 4B. A circumferential guide member 6B is provided.
The outer peripheral guide member 6A and the inner peripheral guide member 6B are detachably fixed with bolts 36 via spacers 12 having substantially the same thickness as the sliding portion 4B, and the inner peripheral side of the outer peripheral guide member 6A is Projects radially inward from the spacer 12, the outer peripheral side of the inner guide member 6B projects radially outward from the spacer 12, and each projecting portion is slidably engaged with the sliding portion 4B to restrict the forward separation of the blade 5. To do.

The inner and outer peripheral portions of the sliding portion 4B, the outer peripheral guide member 6A and the inner peripheral side of the spacer 12, the inner peripheral guide member 6B and the outer peripheral side of the spacer 12 have an arc shape with the longitudinal axis Z as the center of curvature, Further, the vertical centers of the sliding portion 4B and the outer circumferential guide member 6A are positioned higher than the axis ZP of the front-rear axis Z.
The backhoe dozer apparatus 1 collides with the guide member 6 when the excavation operation is performed using the outrigger rather than the tilt swing. If the center in the vertical direction of the guide member 6 is substantially the same height as the front-rear axis Z, the guide member 6 is inclined back and forth with respect to the sliding portion 4B due to rattling or the like when the blade 5 is grounded. The upper and lower ends of the moving part 4B will come into contact with each other, and the upper and lower ends of the guide member 6 may be locally set (or worn), resulting in a decrease in durability.

On the other hand, as described above, when the axis ZP of the longitudinal axis Z is set sufficiently lower than the center of the guide member 6 in the vertical direction, the guide member 6 with respect to the sliding portion 4B when the blade 5 is grounded is set. The contact is in the same direction at the part above the longitudinal axis Z, and the contact of the sliding portion 4B, the outer peripheral guide member 6A and the inner peripheral guide member 6B approaches the entire surface, and the one-contact (or uneven wear) is reduced, resulting in durability. Can be improved.
Further, by arranging the longitudinal axis Z at a low position in front of the longitudinal axis Y, the vertical height of the support 4 can be lowered, and the tilt cylinder S3 can be disposed above it, whereby the longitudinal axis Z It is possible to make the support 4 and the tilt cylinder S3 substantially fit within the range of the vertical dimension of the blade 5 while making it possible to efficiently transmit the acting force of the tilt cylinder S3 by increasing the distance from the connecting pin 31 to the connecting pin 31. The blade 5 or the work situation in front of it can be easily seen from the traveling machine body 2 side.

The left and right inner circumferential guide members 6B are not symmetrically arranged, and the side (left side) on which the rod support 30 is arranged is arranged higher than the opposite side (right side), and the upper end of the left inner circumferential guide member 6B is on the left side. The upper end of the right outer peripheral guide member 6A is positioned lower than the upper end of the right outer peripheral guide member 6A.
The blade 5 and the inner peripheral guide member 6B are attached to and detached from the support body 4 with the tilt cylinder S3 removed and the front and rear axis Z being pivotally deposited on the support body 4.
As shown in FIG. 11, the blade 5 is swung around the longitudinal axis Z with respect to the support 4 to be in an inclined posture. In this state, the inner peripheral guide member 6B is disengaged from the sliding portion 4B, and the blade 5 can be attached to and detached from the support body 4.

Since the front-rear axis Z is located below the center in the vertical direction of the support body 4, the inner peripheral guide member 6 </ b> B (right side) that is separated from the lower side of the sliding portion 4 </ b> B and exposed from the support body 4 The inner peripheral guide member 6B (left side) that can be arranged at the upper and lower centers but is separated from the upper side of the sliding portion 4B is not exposed from the support 4 unless it is arranged above the upper and lower centers of the substrate 7.
In order to connect the front / rear shaft Z and engage the sliding portion 4B of the support 4 with the pair of left and right outer peripheral guide members 6A and 6B mounted in advance on the back surface of the blade 5, The guide member 6B (left side) does not have to be exposed from the support body 4. However, in order to replace the inner peripheral guide member 6B with the front-rear shaft Z connected to the support body 4, a bolt 36 for fastening the inner peripheral guide member 6B is used. Since the blade 5 is swung around the longitudinal axis Z with respect to the support 4 in an inclined posture, the inner peripheral guide member 6B needs to be exposed from the support 4. There is.

The left and right outer peripheral guide members 6A and the inner peripheral guide member 6B can be used upside down at their mounting positions, and can be replaced by changing their positions to the left and right. Even if it hits and wears unevenly, each can be used four times.
The substrate 7 has a position setting unit for setting the front and rear positions of the sliding portion 4B of the support 4 with respect to the substrate 7 when the support 4 is swung from the support 4 until the inner peripheral guide member 6B is exposed. 7a is provided.
The rod support 30 is offset from the left and right center of the back body 5A to the side opposite to the cylinder tube S3b arrangement side (left side), and this rod support 30 protrudes above the support 4, so that the blade 5 is supported. The body 4 cannot swing toward the offset side (counterclockwise in FIG. 11), and cannot swing at a large angle unless it swings to the counter-offset side (clockwise in FIG. 11). Further, the rod support 30 is arranged so as to be shifted from the left and right center of the back body 5A to one side (left side) so that the blade 5 can be largely tilted.

When the blade 5 is greatly tilted, the sliding portion 4B is detached from the substrate 7. When the blade 5 is detached, there is a possibility that the substrate 7 moves backward and the substrate 7 collides with the sliding portion 4B when tilting. By providing the position setting part 7 a at the inner peripheral side lower part and / or the inner peripheral side upper part of the right board 7, the sliding part 4 B is prevented from being detached from the board 7.
In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the 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 angle cylinders S2 may be provided on the left and right sides of the dozer frame 3 so that the support body 4 is angle-swinged by a pair of left and right.
By omitting the inner peripheral guide member 6B of the guide member 6 and providing only the outer peripheral guide member 6A, the outer peripheral guide member 6A can be attached and detached while the blade 5 is attached to the support 4, and the inner peripheral guide member 6B can be attached and detached. Therefore, the rod support 30 may be disposed at the center in the left-right direction of the blade 5 and the tip of the cylinder rod S3a of the tilt cylinder S3 may be disposed directly above the front-rear axis Z.

1 is an overall plan view showing an embodiment of the present invention. FIG. It is a rear view of a blade. It is an enlarged plan view of the principal part. It is an enlarged rear view of the principal part. FIG. It is an exploded side view. It is the whole perspective view seen from back upper. It is the whole perspective view which removed the covers and was seen from the back upper part. It is the perspective view which looked at the braid | blade from the back lower back. It is explanatory drawing which shows tilting of the braid | blade at the time of an inner periphery guide member attachment or detachment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dozer apparatus 2 Traveling machine body 3 Dozer frame 4 Support body 4A Arm part 4B Sliding part 5 Blade 5A Back surface body 5B Blade main body 6 Guide member 6A Outer periphery guide member 6B Inner periphery guide member 7 Substrate 7a Position setting part 8 Cover member 8a Front Edge 8A Center cover part 8B Extension cover part 9 Hydraulic hose 10 Hose cover 11 Square indicator 12 Spacer S1 Dozer cylinder S2 Angle cylinder S3 Tilt cylinder X Horizontal axis Y Vertical axis Z Front and rear axis

Claims (4)

A dozer frame (3) that moves up and down via a dozer cylinder (S1) is pivotally supported on a traveling machine body (2) via a horizontal axis (X), and this dozer frame (3) is moved back and forth via an angle cylinder (S2). A swinging support (4) is pivotally supported via a vertical axis (Y), and a blade (5) swinging up and down via a tilt cylinder (S3) is supported on the support (4) by a longitudinal axis (Z). Is pivoted through
In the tilt cylinder (S3), the tip of the cylinder rod (S3a) is connected to the blade (5) above the longitudinal axis (Z), and the bottom of the cylinder tube (S3b) is connected to the longitudinal axis (Z) from the cylinder rod (S3a). Connected to an arm portion (4A) that is separated from the support member (4) and protrudes outward in the left-right direction ,
The support (4) has a sliding member (4B) facing the blade (5) by fixing a plate material to the tip of the left and right arm portions (4A), and a sliding portion on the back of the blade (5). A guide member (6) that regulates the forward separation of the blade (5) while allowing relative vertical swinging between (4B) and
The bottom of the cylinder tube (S3b) is pivotally supported on the left and right arm portions (4A) of the support body (4) via the cylinder support body (28) in the vicinity of the outer peripheral side of the sliding section (4B). The dozer device characterized by connecting the cylinder rod (S2a) of the angle cylinder (S2) via the angle pin (22) . The front / rear shaft (Z) is provided on the back surface of the blade (5) so as to protrude rearward, and the vertical bearing member (17) of the dozer frame (3) through which the vertical axis (Y) is inserted is arranged in the vertical direction. 2. The dozer device according to claim 1, wherein the dozer device is located below the center (H) and faces the lower portion of the longitudinal axis (Y) in close proximity . The support (4) connects the upper plate (4u) and the lower plate (4d) with vertical plates, and the plate material of the sliding portion (4B) is fixed to the upper plate (4u) and the lower plate (4d). The cylinder support (28) is provided on the upper surface of the outer end of the upper plate (4u), and the cylinder rod (S2a) of the angle cylinder (S2) is attached to the angle pin (under the upper plate (4u)). The dozer device according to claim 1 or 2, wherein the dozer device is connected at 22) . The sliding portion (4B) is formed with an outer peripheral edge (4Ba) and an inner peripheral edge (4Bb) that are located radially away from the longitudinal axis (Z), and the position of the outer peripheral edge (4Ba) in the left-right direction is The dozer device according to any one of claims 1 to 3, wherein the dozer device is in the vicinity of the position of the angle pin (22) .

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