CN215474295U

CN215474295U - Cross arm connecting device and engineering vehicle

Info

Publication number: CN215474295U
Application number: CN202121876575.1U
Authority: CN
Inventors: 孔德飞; 沈川; 杨浩
Original assignee: Hunan Sany Medium Lifting Machinery Co Ltd
Current assignee: Hunan Sany Medium Lifting Machinery Co Ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2022-01-11
Anticipated expiration: 2031-08-11

Abstract

The utility model relates to the technical field of cranes, in particular to a cross arm connecting device and an engineering vehicle. The cross arm connecting device comprises a steering knuckle, a connecting piece and at least two cross arms, wherein the connecting piece comprises a connecting piece body, two first lugs and at least two second lugs, each first lug is connected with one end of the connecting piece body, each second lug is connected with the other end, opposite to the connecting piece body, of the connecting piece body, each first lug is connected with the steering knuckle in a rotating mode, and each second lug is connected with each cross arm in a rotating mode. The connecting device indirectly connects at least two cross arms with the steering knuckle through the arrangement of the connecting piece, and only the connecting piece is replaced when the connecting part of the cross arms and the connecting piece is worn, so that the steering knuckle is protected. The connecting piece body is provided with the first lugs and the second lugs, the first lugs are connected with the steering knuckle respectively, and the cross arms are connected with the second lugs respectively, so that the mounting space can be enlarged, and the mounting is more convenient.

Description

Cross arm connecting device and engineering vehicle

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a cross arm connecting device and an engineering vehicle.

Background

For engineering vehicles such as large cranes, in particular all-terrain cranes, a double-wishbone suspension system is usually adopted in order to meet the requirements on the running smoothness of the vehicles. The double-cross-arm structure is respectively movably connected with the steering knuckle, and along with the increase of time, the position where the cross arm is connected with the steering knuckle is easy to wear, so that the whole steering knuckle needs to be replaced.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem that the connecting position of the cross arm and the steering knuckle is abraded, so that the whole steering knuckle needs to be replaced.

In order to solve the above problems, the present invention provides a cross arm connecting device, which includes a knuckle, a connecting member, and at least two cross arms, wherein the connecting member includes a connecting member body, two first lugs and at least two second lugs, each of the first lugs is connected to one end of the connecting member body, each of the second lugs is connected to the opposite end of the connecting member body, each of the first lugs is rotatably connected to the knuckle, and each of the second lugs is rotatably connected to each of the cross arms.

Optionally, the knuckle includes a knuckle body and two lugs arranged at an interval, the cross arm connecting device further includes two rotating shaft connectors, the lugs are connected to the knuckle body, the first lugs are provided with first connecting holes, the lugs are provided with second connecting holes, and each rotating shaft connector passes through the corresponding first connecting hole on the first lug and the corresponding second connecting hole on the lug.

Optionally, the cross arm connecting device further comprises a knuckle arm and a mounting seat adapted to be connected with a suspension cylinder, the knuckle arm is connected with one of the lugs, the mounting seat is located on the side of the knuckle arm far away from the knuckle, and the mounting seat is connected with the knuckle arm; the cross arm connecting device further comprises a steering trapezoidal arm, and the steering trapezoidal arm is connected with the other support lug.

Optionally, a third connecting hole is formed in the knuckle arm, all the first connecting holes, the second connecting holes and the third connecting holes are coaxially arranged, one of the first connecting holes is a first rotating shaft connecting piece, and the first rotating shaft connecting piece penetrates through the corresponding first connecting holes, the second connecting holes and the third connecting holes and then is connected with the mounting seat.

Optionally, first pivot connecting piece includes first pivot portion and second pivot portion, first pivot portion with second pivot portion interconnect and coaxial setting, the diameter of first pivot portion is less than the diameter of second pivot portion, the diameter of second pivot portion is greater than the diameter of third connecting hole, second pivot portion passes correspondingly first connecting hole with the second connecting hole, first pivot portion passes the third connecting hole with the connection can be dismantled to the mount pad.

Optionally, one of them pivot connecting piece is the second pivot connecting piece, the second pivot connecting piece includes second pivot body and end, the diameter of end is greater than the diameter of second connecting hole, the second pivot body pass corresponding the second connecting hole with first connecting hole, the end be located the knuckle with turn to between the trapezoidal arm.

Optionally, the cross arm connecting device further includes a transmission shaft, the connecting member body is provided with a limiting hole, the limiting hole is located between the two first lugs, the limiting hole is perpendicular to the central axis of the first connecting hole, and the limiting hole is suitable for the transmission shaft to pass through.

Optionally, the cross arm connecting device further comprises a mounting bearing, the mounting bearing is mounted in the limiting hole, and the mounting bearing is sleeved on the transmission shaft.

Optionally, the cross arm includes a connecting end seat and two connecting arms, one end of each connecting arm is connected with the end seat, and the two connecting arms are arranged at an acute angle; the two second lugs are respectively positioned at two ends of the connecting piece body in the length direction, each connecting end seat is hinged with each second lug, and the other end of each connecting arm is suitable for being connected with a frame.

Optionally, the first lug is perpendicular to a rotation center line of the steering knuckle, the second lug is perpendicular to a rotation center line of the cross arm, the connecting end seat comprises an end seat body and two oppositely arranged connecting plates, the connecting arm and the connecting plates are respectively connected with two opposite ends of the end seat body, the lug is located between the two connecting plates, a fourth connecting hole is formed in the connecting plate, a fifth connecting hole is formed in the second lug, the cross arm connecting device further comprises a pin connecting piece, and the pin connecting piece penetrates through the fourth connecting hole and the fifth connecting hole simultaneously to achieve hinged connection of the second lug and the connecting plates.

Compared with the prior art, the cross arm connecting device has the beneficial effects that:

the connecting device indirectly connects at least two cross arms with the steering knuckle through the arrangement of the connecting pieces, and when the joints of the cross arms and the connecting pieces are worn, only the connecting pieces can be replaced, so that the steering knuckle is protected. Through set up two first lugs and two at least second lugs on the connecting piece body, be connected each first lug with the knuckle respectively, be connected each xarm with each second lug respectively, because first lug and second lug protrusion in the connecting piece body to can increase installation space, make the installation more convenient, avoid the installation to appear interfering.

The utility model also provides a crane which comprises the cross arm connecting device. The crane has the same beneficial effects with the cross arm connecting device, and the description is omitted.

Drawings

FIG. 1 is a schematic view of a cross arm connecting device mounted to a vehicle frame according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the utility model at A in FIG. 1;

FIG. 3 is a schematic view of the mounting of the cross arm connection in an embodiment of the utility model;

FIG. 4 is an enlarged view of a portion of the present invention at B of FIG. 3;

FIG. 5 is an exploded view of the cross arm connection in an embodiment of the present invention;

FIG. 6 is a schematic structural view of a connector in an embodiment of the utility model;

FIG. 7 is a schematic structural view of a cross arm in an embodiment of the utility model;

fig. 8 is a schematic structural view of the coupling member and the knuckle according to the embodiment of the present invention.

Description of reference numerals:

1-connecting piece, 2-steering knuckle, 3-suspension oil cylinder, 4-vehicle frame, 5-cross arm, 7-steering trapezoid arm, 8-steering tie rod, 9-transmission shaft, 10-steering knuckle arm, 11-connecting piece body, 12-second lug, 13-first lug, 14-limiting hole, 21-steering knuckle body, 22-lug, 51-connecting arm, 52-connecting end seat, 53-connecting rod, 61-mounting seat, 62-rotating shaft connecting piece, 63-pin shaft connecting piece, 121-fifth connecting hole, 131-first connecting hole, 521-end seat body, 522-connecting plate, 523-fourth connecting hole, 621-first rotating shaft connecting piece, 622-second rotating shaft connecting piece and 6211-first rotating shaft part, 6212-second shaft part, 6221-second shaft body, 6222-end.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the terms "an embodiment," "one embodiment," and "an implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment or example implementation of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

Also, in the drawings, the Z-axis represents a vertical direction, that is, an up-down direction, and a positive direction of the Z-axis (that is, an arrow direction of the Z-axis) represents an up direction, and a negative direction of the Z-axis (that is, a direction opposite to the positive direction of the Z-axis) represents a down direction; in the drawings, the X-axis represents the left-right direction, and the positive direction of the X-axis (i.e., the arrow direction of the X-axis) represents the right, and the negative direction of the X-axis (i.e., the direction opposite to the positive direction of the X-axis) represents the left; in the drawings, the Y-axis represents the front-rear direction, and the positive direction of the Y-axis (i.e., the arrow direction of the Y-axis) represents the front, and the negative direction of the Y-axis (i.e., the direction opposite to the positive direction of the Y-axis) represents the rear; it should also be noted that the foregoing Z-axis, Y-axis, and X-axis representations are merely intended to facilitate the description of the utility model and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the utility model.

An embodiment of the present invention provides a cross arm connecting device, as shown in fig. 1 to 5, including a knuckle 2, a connecting member 1, and at least two cross arms 5, where the connecting member 1 includes a connecting member body 11, two first lugs 13, and at least two second lugs 12, each of the first lugs 13 is connected to one end of the connecting member body 11, each of the second lugs 12 is connected to the other end of the connecting member body 11, each of the first lugs 13 is hinged to the knuckle 2, and each of the second lugs 12 is connected to each of the cross arms 5.

In the present embodiment, the cross arm 5 is connected to the frame 4, the cross arm 5 may also be referred to as a swing arm, the second lug 12 may have two, three or more, the second lug 12 may be integrally connected or bolt-fastened to a side wall of the connector body 11, the connector body 11 may have a columnar structure, for example, a cylindrical or rectangular column structure, all the second lugs 12 are arranged along a length direction of the connector body 11, and the length direction of the connector body 11 is a central axis direction of the columnar structure. When there are only two second lugs 12, the two second lugs 12 are respectively connected with the side wall of the connector body, and the two second lugs 12 are respectively located at two ends of the connector body 11 in the length direction. The first lugs 13 may be integrally connected with the side wall of the connector body 11 or fastened by bolts, each first lug 13 may be rotatably connected with the knuckle 2 by a pin, and each first lug 13 may be respectively hinged with the knuckle 2. Steering knuckles 2 are respectively arranged on the left side and the right side of a frame 4, each steering knuckle 2 is respectively connected with a corresponding connecting piece 1, and each connecting piece 1 is respectively connected with two cross arms 5 in a rotating way.

Therefore, the connection of at least two cross arms 5 and the steering knuckle 2 is indirectly realized through the arrangement of the connecting piece 1, when the connecting part of the cross arm 5 and the connecting piece 1 is worn, only the connecting piece 1 can be replaced, and the protection of the steering knuckle 2 is realized. Through set up two first lugs 13 and two at least second lugs 12 on connecting piece body 11, be connected each first lug 13 with knuckle 2 respectively, be connected each xarm 5 with each second lug 12 respectively, because first lug 13 and second lug 12 protrusion in connecting piece body 11 to can increase installation space, make the installation more convenient, avoid the installation to appear interfering.

As shown in fig. 4 to 8, the knuckle 2 includes a knuckle body 21 and two opposite lugs 22 arranged at intervals, the cross arm connecting device further includes two rotating shaft connectors 62, the lugs 22 are connected to the knuckle body 21, a first connecting hole 131 is formed in the first lug 13, a second connecting hole is formed in the lug 22, and each rotating shaft connector 62 passes through the first connecting hole 131 of the corresponding first lug 13 and the second connecting hole of the corresponding lug 22.

In the embodiment, the support lug 22 is integrally connected or bolt-fastened with the knuckle body 21, the support lug 22 may have a circular, rectangular or polygonal structure, the two first lugs 13 are at least partially located between the two support lugs 22, and the first connection hole 131 and the second connection hole are coaxial. The shaft coupling 62 may be a pin or other post structure, and the shaft coupling 62 may also be other structures including post structures, such as a bolt.

The rotating shaft connecting piece 62 close to the upper part is a first rotating shaft connecting piece 621, the rotating shaft connecting piece 62 close to the lower part is a second rotating shaft connecting piece 622, and the two support lugs 22 are arranged oppositely up and down; the support lug 22 close to the upper part of the steering knuckle body 21 is an upper support lug, the support lug close to the lower part of the steering knuckle body 21 is a lower support lug, second connecting holes are respectively formed in the upper support lug and the lower support lug, and the second connecting holes in the upper support lug and the lower support lug are coaxial; the first lug 13 close to the upper part is a first upper lug, the first lug 13 close to the lower part is a first lower lug, the first upper lug and the first lower lug are respectively provided with a first connecting hole 131, and the first connecting holes 131 on the first upper lug and the first lower lug are coaxial; the first rotating shaft connector 621 penetrates through the first connecting hole 131 on the first upper lug and the second connecting hole on the upper lug to realize the rotating connection of the first upper lug and the upper lug, and the second rotating shaft connector 622 penetrates through the first connecting hole 131 on the first lower lug and the second connecting hole on the lower lug to realize the rotating connection of the first lower lug and the lower lug.

As shown in fig. 5, the cross arm connecting device further includes a knuckle arm 10 and a mount 61 adapted to be connected to the suspension cylinder 3, the knuckle arm 10 being connected to one of the lugs 22, the mount 61 being located on a side of the knuckle arm 10 remote from the knuckle 2, the mount 61 being connected to the knuckle arm 10; the knuckle arm 10 is provided with a third connecting hole, all the first connecting holes 131, the second connecting holes and the third connecting holes are coaxial, one of the rotating shaft connectors 62 is a first rotating shaft connector 621, and the first rotating shaft connector 621 penetrates through the corresponding first connecting holes 131, second connecting holes and third connecting holes and then is connected with the mounting base 61.

In the present embodiment, the knuckle arm 10 is connected to the upper lug, and the knuckle arm 10 may be fixed to the upper lug by a bolt-fastening connection or by a plurality of pin connections. The first shaft connector 621 may be screwed or interference-fitted with the mounting seat 61. The mount pad 61 is located the top of knuckle arm 10, and the mount pad 61 can be dismantled with knuckle arm 10 and be connected, and the mount pad 61 also can be connected with knuckle arm 10 through first pivot connecting piece 621, is connected with the upper lug through knuckle arm 10 and realizes fixing the mount pad 61 on knuckle 2 indirectly, and because first pivot connecting piece 621 is connected with mount pad 61 to the realization is to the location of first pivot connecting piece 621.

As shown in fig. 8, the first rotating shaft connector 621 includes a first rotating shaft portion 6211 and a second rotating shaft portion 6212, the first rotating shaft portion 6211 and the second rotating shaft portion 6212 are connected to each other and coaxially disposed, a diameter of the first rotating shaft portion 6211 is smaller than a diameter of the second rotating shaft portion 6212, a diameter of the second rotating shaft portion 6212 is larger than a diameter of the third connecting hole, the second rotating shaft portion 6212 passes through the corresponding first connecting hole 131 and the second connecting hole, and the first rotating shaft portion 6211 passes through the third connecting hole to be detachably connected with the mounting base 61.

In the present embodiment, the longitudinal section of the first shaft connector 621 is trapezoidal, and the first shaft portion 6211 and the second shaft portion 6212 may be formed as an integral structure or may be fastened by a screw. Here, the diameter of the first shaft portion 6211 refers to the outer diameter of the first shaft portion 6211, and the diameter of the second shaft portion 6212 refers to the outer diameter of the second shaft portion 6212. When the mounting is performed, the knuckle arm 10 is mounted on the upper lug, the mounting seat 61 is placed above the knuckle arm 10 and at the third connecting hole, the first upper lug of the connecting piece 1 is placed below the upper lug, the first connecting hole 131 and the second connecting hole are aligned, finally, the first pivot connecting piece 621 sequentially penetrates through the first connecting hole 131, the second connecting hole and the third connecting hole from the lower side of the first upper lug, and the first pivot connecting piece 621 is screwed, so that the first pivot connecting piece 621 is connected with the mounting seat 61. Since the diameter of the second rotating shaft portion 6212 is larger than that of the third connecting hole, the first rotating shaft portion 6211 is connected to the mounting seat 61, and the second rotating shaft portion 6212 can be brought into abutment with the knuckle arm 10 by a biasing force, thereby positioning the mounting seat 61 in the axial direction of the third connecting hole. Here, a screw portion, for example, a polygonal structure, may be provided at a lower end of the second shaft portion 6212 to facilitate the screwing of the first shaft connector 621.

As shown in fig. 8, the cross arm connecting device further includes a steering trapezoid arm 7, the steering trapezoid arm 7 is connected to another support lug 22, one of the rotating shaft connectors 62 is a second rotating shaft connector 622, the second rotating shaft connector 622 includes a second rotating shaft body 6221 and a head 6222, the diameter of the head 6222 is larger than that of the second connecting hole, the second rotating shaft body 6221 passes through the corresponding second connecting hole and the first connecting hole 131, and the head 6222 is located between the steering knuckle 2 and the steering trapezoid arm 7.

In this embodiment, one end of the steering trapezoid arm 7 is connected with the lower support lug, and the steering trapezoid arm 7 can be fixed on the lower support lug through bolt fastening connection or through a plurality of pin connections; the other end is connected with a tie rod 8. When the installation, first connecting hole 131 on the first lower lug is aligned with the second connecting hole of the lower lug, then pass through second connecting hole and first connecting hole 131 from the lower lug below, and make end 6222 be located the below of lower lug, turn to trapezoidal arm 7 and be connected with the lower lug at last, because end 6222 is located between knuckle 2 and the trapezoidal arm 7 of turning to and the diameter of end 6222 is greater than the diameter of second connecting hole, turn to trapezoidal arm 7 and lower lug and form the location to end 6222 jointly, turn to trapezoidal arm and fix, realized the fixed of end 6222, and then realized the location to second pivot connecting piece 622. Here, the steering trapezoid arm 7 may be provided with a groove having a thickness equal to that of the head 6222, and the head 6222 may be accommodated in the groove.

As shown in fig. 3, 5 and 6, the cross arm connecting device further includes a transmission shaft 9, a limiting hole 14 is formed in the connecting member body 11, the limiting hole 14 is located between the two first lugs 13, the limiting hole 14 is perpendicular to the central axis of the first connecting hole 131, and the limiting hole 14 is suitable for the transmission shaft 9 to pass through.

In this embodiment, the cross arm connecting device may be used for an independent suspension of a driving wheel, the transmission shaft 9 may be disposed along an X-axis direction, the direction of the limiting hole 14 is disposed along the X-axis direction, the direction of the first connecting hole 131 is disposed along a Z-axis direction, one end of the transmission shaft 9 passes through the limiting hole 14 to be in transmission connection with a wheel-side assembly (also referred to as a knuckle body 21), the other end of the transmission shaft is connected with a speed reducer, and the transmission shaft 9 passes through two lugs 22. Therefore, the limiting hole 14 is formed in the connecting piece 1, the transmission shaft 9 can pass through the limiting hole, and the connecting piece 1 is prevented from interfering with the installation of the transmission shaft 9.

In this embodiment, the cross arm connection device further includes a mounting bearing, the mounting bearing is mounted in the limiting hole 14, and the mounting bearing is sleeved on the transmission shaft 9. That is, the mounting bearing can be positioned and mounted in the limiting hole 14, and the transmission shaft 9 passes through the mounting bearing, so that the radial positioning of the transmission shaft 9 is formed, and the abrasion between the transmission shaft 9 and the connecting piece 1 can be avoided.

As shown in fig. 7, the cross arm 5 includes a connecting end seat 52 and two connecting arms 51, one end of each connecting arm 51 is connected with the connecting end seat 52, and the two connecting arms 51 are arranged at an acute angle; the two second lugs 12 are respectively arranged at two ends of the connecting piece body 11 in the length direction, each connecting end seat 52 is hinged with each second lug 12, and the other end of each connecting arm 51 is suitable for being connected with the frame 4.

In this embodiment, the connecting end seat 52 and the two connecting arms 51 may be an integral structure, and may be connected by inserting or fastening bolts. The second lugs 12 are integrally connected to the sidewalls of the connector body 11 in the longitudinal direction of the connector body 11, i.e., the axial direction of the first connection holes 131. The two connecting arms 51 are disposed at an acute angle, which means that a certain included angle is formed between the two connecting arms 51 and the included angle is an acute angle. Each connecting end seat 52 is hinged with a corresponding second lug 12, and the connecting end seat 52 can rotate relative to the second lug 12. Here, a connecting rod 53 may be further disposed between the two connecting arms 51, two ends of the connecting rod 53 are respectively connected with the connecting arms 51, and the two connecting arms 51 and the connecting rod 53 together form an a-shaped structure, thereby forming an enhancement to the overall structure of the cross arm 5.

As shown in fig. 7, a rotation center line of the first lug 13 rotatably connected to the knuckle 2 and a rotation center line of the second lug 12 rotatably connected to the cross arm 5 are perpendicular to each other, where the rotation center line of the first lug 13 rotatably connected to the knuckle 2 is arranged along a Z-axis direction, the rotation center line of the second lug 12 rotatably connected to the cross arm 5 is arranged along a Y-axis direction, the connection end base 52 includes an end base body 521 and two oppositely arranged connection plates 522, the connection arm 51 and the connection plates 522 are respectively connected to opposite ends of the end base body 521, the lug 12 is located between the two connection plates 522, the connection plate 522 is provided with a fourth connection hole 523, the second lug 12 is provided with a fifth connection hole 121, the fifth connection hole 121 is perpendicular to an axial direction of the first connection hole 111, the cross arm connection device further includes a pin connection member 63, and the pin connection member 63 simultaneously passes through the fourth connection hole 523 and the fifth connection hole 121 to connect the second lug 12 and the first connection hole 111 The plate 522 is hingedly connected.

In this embodiment, the two connecting plates 522 are disposed oppositely, that is, the two connecting plates 522 are disposed at intervals, the positions of the fourth connecting hole 523 and the fifth connecting hole 121 are corresponding, that is, the fourth connecting hole 523 and the fifth connecting hole 121 are coaxially disposed, the pin connecting member 63 may be a pin or other columnar structure, and the pin connecting member 63 may also be other structures including a columnar structure, such as a bolt. The connecting plate 522 is provided with the fourth connecting hole 523, the lug 12 is provided with the fifth connecting hole 121, and the pin shaft connecting piece 63 simultaneously penetrates through the fourth connecting hole 523 and the fifth connecting hole 121 to realize the connection of the two connecting plates 522 and the lug 12, so that the mounting structure is simplified. Meanwhile, the fifth connecting hole 121 is perpendicular to the axial direction of the first connecting hole 111, that is, the direction in which the cross arm 5 rotates relative to the link 1 is perpendicular to the direction in which the link 1 moves relative to the knuckle 2, so that the overall flexibility is increased and the stress is more stable.

A work vehicle according to another embodiment of the present invention includes the cross arm connecting device as described above. The engineering vehicle can be a crane and the like, and the beneficial effects of the engineering vehicle and the cross arm connecting device are the same, and are not repeated herein.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims

1. The cross arm connecting device is characterized by comprising a steering knuckle (2), a connecting piece (1) and at least two cross arms (5), wherein the connecting piece (1) comprises a connecting piece body (11), two first lugs (13) and at least two second lugs (12), each first lug (13) is connected with one end of the connecting piece body (11), each second lug (12) is connected with the other end, opposite to the other end, of the connecting piece body (11), each first lug (13) is connected with the steering knuckle (2) in a rotating mode, and each second lug (12) is connected with each cross arm (5) in a rotating mode.

2. The cross arm connecting device according to claim 1, wherein the steering knuckle (2) comprises a steering knuckle body (21) and two support lugs (22) which are oppositely arranged at intervals, the cross arm connecting device further comprises two rotating shaft connecting pieces (62), the support lugs (22) are connected with the steering knuckle body (21), a first connecting hole (131) is formed in the first lug (13), a second connecting hole (23) is formed in the support lugs (22), and each rotating shaft connecting piece (62) penetrates through the corresponding first connecting hole (131) in the first lug (13) and the corresponding second connecting hole (23) in the support lug (22).

3. The cross arm connection device according to claim 2, further comprising a knuckle arm (10) and a mounting seat (61) adapted to be connected to a suspension cylinder (3), the knuckle arm (10) being connected to one of the lugs (22), the mounting seat (61) being located on a side of the knuckle arm (10) remote from the knuckle (2), the mounting seat (61) being connected to the knuckle arm (10); the cross arm connecting device further comprises a steering trapezoidal arm (7), and the steering trapezoidal arm (7) is connected with the other support lug (22).

4. The cross arm connecting device according to claim 3, wherein a third connecting hole is formed in the knuckle arm (10), all of the first connecting hole (131), the second connecting hole (23) and the third connecting hole are coaxially arranged, one of the spindle connectors (62) is a first spindle connector (621), and the first spindle connector (621) passes through the corresponding first connecting hole (131), the second connecting hole (23) and the third connecting hole and then is connected with the mounting seat (61).

5. The overarm connecting device according to claim 4, wherein the first pivot connector (621) includes a first pivot portion (6211) and a second pivot portion (6212), the first pivot portion (6211) and the second pivot portion (6212) being connected to each other and coaxially disposed, a diameter of the first pivot portion (6211) being smaller than a diameter of the second pivot portion (6212), a diameter of the second pivot portion (6212) being larger than a diameter of the third connecting hole, the second pivot portion (6212) passing through the corresponding first connecting hole (131) and the second connecting hole (23), the first pivot portion (6211) passing through the third connecting hole to be detachably connected with the mounting seat (61).

6. The overarm attachment device according to claim 3, wherein one of the spindle connectors (62) is a second spindle connector (622), the second spindle connector (622) comprising a second spindle body (6221) and a head (6222), the head (6222) having a diameter larger than the diameter of the second attachment hole (23), the second spindle body (6221) passing through the corresponding second attachment hole (23) and the first attachment hole (131), the head (6222) being located between the knuckle (2) and the knuckle trapezoid arm (7).

7. The cross arm connecting device according to claim 2, further comprising a transmission shaft (9), wherein a limiting hole (14) is formed in the connecting piece body (11), the limiting hole (14) is located between the two first lugs (13), the limiting hole (14) is perpendicular to the central axis of the first connecting hole (131), and the limiting hole (14) is suitable for the transmission shaft (9) to pass through; the cross arm connecting device further comprises a mounting bearing, the mounting bearing is mounted in the limiting hole (14), and the mounting bearing is sleeved on the transmission shaft (9).

8. The cross-arm connecting device according to claim 1, wherein the cross arm (5) comprises a connecting end seat (52) and two connecting arms (51), one end of each connecting arm (51) is connected with the connecting end seat (52), and the two connecting arms (51) are arranged at an acute angle; the number of the second lugs (12) is two, the two second lugs (12) are respectively located at two ends of the connecting piece body (11) in the length direction, each connecting end seat (52) is hinged to each second lug (12), and the other end of each connecting arm (51) is suitable for being connected with a frame (4).

9. The cross arm connecting device according to claim 8, wherein a rotation center line of the first lug (13) rotatably connected with the steering knuckle (2) is perpendicular to a rotation center line of the second lug (12) rotatably connected with the cross arm (5), the connecting end seat (52) comprises an end seat body (521) and two opposite connecting plates (522), the connecting arm (51) and the connecting plates (522) are respectively connected with two opposite ends of the end seat body (521), the second lug (12) is located between the two connecting plates (522), a fourth connecting hole (523) is formed in the connecting plate (522), a fifth connecting hole (121) is formed in the second lug (12), the cross arm connecting device further comprises a pin connecting piece (63), and the pin connecting piece (63) simultaneously penetrates through the fourth connecting hole (523) and the fifth connecting hole (121) to realize the second lug (12) and the fifth connecting hole (121) The connecting plate (522) is hinged.

10. A work vehicle comprising the cross-arm connection of any one of claims 1 to 9.