JP2010037787A - Bulldozer equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide bulldozer equipment capable of preventing a cover member for tilt cylinder from being broken by a blade simply. <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 blade 5 has a rear surface body 5A supported on the fore-and-aft shaft Z and a blade body 5B fixed on a front face of the rear surface body 5A and having an upper part covering an upper fringe of the rear surface body 5A. The tilt cylinder S3 is provided between the rear surface body 5A and the supporting body 4, the cover member 8 covering the tilt cylinder S3 from above is attached to the rear surface body 5A, and a front fringe 8a of the cover member 8 is arranged on a lower side than the upper part 5Bb of the blade body 5B. <P>COPYRIGHT: (C)2010,JPO&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 Document 1, 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 this dozer frame is supported via an angle cylinder. 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.
The blade has a back body supported by the front and rear shafts, and a blade body fixed to the front surface of the back body and having an upper portion covering the upper edge of the back body, and between the back body and the support body. A tilt cylinder is provided on the back body, and a cover member for covering the tilt cylinder from above is attached to the back body.
JP 2001-164597 A

In the prior art, the cover member can protect the tilt cylinder, but its front edge is disposed above the upper part of the blade body, and easily collides with an object during advancement and is easily damaged.
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.
It is an object of the present invention to provide a dozer device in which the front edge of the cover member for the tilt cylinder is disposed below the upper part of the blade body so that the cover member can be easily prevented from being damaged by the blade. To do.

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.
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. A tilt cylinder S3 is provided between the support body 4 and a cover member 8 that covers the tilt cylinder S3 from above is attached to the back surface 5A. The front edge 8a of the cover member 8 is below the upper part 5Bb of the blade body 5B. It is arranged on the side.

Secondly, the support body 4 has a sliding portion 4B that protrudes forward at the tip of a pair of left and right arm portions 4A that protrudes outward in the left-right direction, and faces the blade 5. A guide member 6 is provided for restricting the front separation of the blade 5 while allowing relative vertical swing between the sliding portions 4B;
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 guide members 6 from above. A receiving member 25 for receiving the front edge 8a of the cover member 8 is provided on the back surface of the blade 5.

Thirdly, a hose cover 10 that protrudes backward to the vicinity of the vertical axis Y of the cover member 8 and covers the hydraulic hose 9 reaching the tilt cylinder S3 is provided in the vicinity of the vertical axis Y of the dozer frame 3, and the hose cover 10 and the cover The member 8 is provided with an angle indicator 11 for displaying the angle angle and / or tilt angle of the blade 5.
Fourth, the corner indicator 11 is arranged on a plane that substantially passes through both the longitudinal axis Y and the longitudinal axis Z.
[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. )
The tilt cylinder S3 is provided between the back body 5A of the blade 5 and the support body 4, a cover member 8 that covers the tilt cylinder S3 from above is provided on the back body 5A, and the upper part of the blade body 5B is located on the back body 5A. Using the shape, the front edge 8a of the cover member 8 is disposed below the upper part 5Ba of the blade body 5B, and the collision object collides with the upper part 5Ba of the blade body 5B. However, it does not collide with the front edge 8a of the cover member 8.

When tilting and swinging by the tilt cylinder S3, the sliding portion 4B at the tip of the left and right arm portions 4A of the support 4 is engaged with the guide member 6 while allowing the blade 5 to swing relatively up and down. Is supported with a good balance between left and right.
The cover member 8 has an extended cover portion 8B extending from the central cover portion 8A, covers the sliding portion 4B and the left and right guide members 6 from the upper side, and prevents the earth and sand from falling onto the engaging portion.
Further, a receiving member 25 for receiving the front edge 8a of the cover member 8 is provided on the upper part 5Ab on the back surface of the blade 5, so that deformation of the cover member 8 is also prevented.

The cover member 8 protrudes backward to the vicinity of the vertical axis Y, and a hose cover 10 is provided in the vicinity of the vertical axis Y of the dozer frame 3 to cover the hydraulic hose 9 reaching the tilt cylinder S3. The hose cover 10 and the cover member Since the angle display 11 is provided between the blade 8 and the angle indicator 8, the angle angle and / or the tilt angle of the blade 5 can be displayed.
By arranging the angle display 11 on a plane that substantially passes through both the longitudinal axes Y and Z, the angle angle and / or the tilt angle can be displayed more accurately.

  According to the present invention, breakage of the cover member for the tilt cylinder can be easily prevented with 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 the 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 front surface of the sliding portion 4B faces 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 lower edge of the blade edge 33 protrudes 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 6 </ b> B projects radially outward from the spacer 12, and each projecting portion is slidably engaged with the sliding portion 4 </ b> B 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 changed, 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.
The blade 5 may have a plate edge in which the upper portion 5Bb does not have the rounded portion 5Ba, and the inner peripheral guide member 6B of the guide member 6 may be omitted and only the outer peripheral guide member 6A may be provided.

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
The blade (5) includes a back body (5A) supported by the front and rear shaft (Z), and a blade body (fixed to the front surface of the back body (5A) and having an upper portion covering the upper edge of the back body (5A). 5B), a tilt cylinder (S3) is provided between the back body (5A) and the support body (4), and the back member (5A) covers the tilt cylinder (S3) from above. 8), and the front edge (8a) of the cover member (8) is disposed below the upper part (5Bb) of the blade body (5B). The support (4) has a sliding portion (4B) protruding forward and facing the blade (5) at the tip of a pair of left and right arms (4A) protruding outward in the left-right direction. 5) is provided with a guide member (6) for restricting the forward separation of the blade (5) while allowing relative vertical swing between the left and right sliding portions (4B) on the back surface of
The cover member (8) includes a central cover portion (8A) that covers the tilt cylinder (S3), and the left and right sliding portions (4B) and left and right guide members (6) extending from the central cover portion (8A). ) From the upper side, and a receiving member (25) for receiving the front edge (8a) of the cover member (8) is provided on the back surface of the blade (5). The dozer device according to claim 1.   A hose cover (10) for projecting the cover member (8) backward to the vicinity of the vertical axis (Y) and covering the hydraulic hose (9) reaching the tilt cylinder (S3) in the vicinity of the vertical axis (Y) of the dozer frame (3) The angle indicator (11) for displaying the angle angle and / or tilt angle of the blade (5) is provided on the hose cover (10) and the cover member (8). Or the dozer apparatus of 2.   The dozer device according to claim 3, wherein the corner indicator (11) is arranged on a plane substantially passing through both the longitudinal axis (Y) and the longitudinal axis (Z).

Images