CN211222940U

CN211222940U - Hollow trapezoidal arm and rear suspension for passenger car

Info

Publication number: CN211222940U
Application number: CN201922169886.3U
Authority: CN
Inventors: 成龙; 王兴平; 王念强; 李耀超
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2019-12-06
Filing date: 2019-12-06
Publication date: 2020-08-11
Anticipated expiration: 2029-12-06

Abstract

The utility model relates to a trapezoidal arm technical field discloses a hollow trapezoidal arm and rear suspension for passenger car. Wherein hollow trapezoidal arm for passenger car includes: the ladder-shaped arm body is provided with a first cavity; the front curved wall and the rear curved wall are arranged on the right side of the trapezoidal arm body and are respectively positioned at two ends of the trapezoidal arm body, the front curved wall is provided with a second cavity, the rear curved wall is provided with a third cavity, the first cavity, the second cavity and the third cavity are sequentially communicated, the tail end of the front curved wall is provided with a lining mounting hole, and the tail end of the rear curved wall is provided with a spherical pin mounting hole; the steering knuckle mounting bracket and the connecting rod mounting bracket are arranged on the left side surface of the trapezoidal arm body in parallel. The utility model discloses a hollow trapezoidal arm for passenger car with trapezoidal arm body, preceding curved wall and the hollow setting of back curved wall, alleviateed the weight of hollow trapezoidal arm for passenger car, the central axis of bush mounting hole and the central axis parallel arrangement of sphere round pin mounting hole can be applicable to the higher condition of rear axle load.

Description

Hollow trapezoidal arm and rear suspension for passenger car

Technical Field

The utility model relates to a trapezoidal arm technical field especially relates to a hollow trapezoidal arm and rear suspension for passenger car.

Background

In the prior art, the trapezoid arm is made of a plurality of materials, and the two modes of aluminum alloy low-pressure casting and common nodular cast iron material sand casting are the most common. The trapezoid arm made of ordinary nodular cast iron through sand casting has the material strength of below 500MPa, is suitable for passenger car products with the rear axle load of below 2 tons, but the ordinary nodular cast iron trapezoid arm cannot meet the strength requirement for a rear suspension with the rear axle load of above 2 tons, and is often damaged in the using process. Although the rear suspension formed by aluminum alloy low-pressure casting is light in weight, the aluminum alloy material has the tensile strength of less than 300MPa, and is only suitable for passenger car products with the rear axle load of less than 1.5 tons.

SUMMERY OF THE UTILITY MODEL

Based on the above, an object of the utility model is to provide a hollow trapezoidal arm for passenger car has solved the problem that the trapezoidal arm that prior art exists only is applicable to the lower motorcycle type of rear axle load.

Another object of the utility model is to provide a rear suspension has strengthened the joint strength of taking a bus with hollow trapezoidal arm and sub vehicle frame, can be applicable to the higher motorcycle type of rear axle load.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a hollow ladder arm for a passenger vehicle, the hollow ladder arm for a passenger vehicle comprising: the device comprises a trapezoidal arm body, wherein a first cavity is arranged on the trapezoidal arm body; the front curved wall and the rear curved wall are arranged on the right side of the trapezoid arm body and are respectively positioned at two ends of the trapezoid arm body, a second cavity is arranged on the front curved wall, a third cavity is arranged on the rear curved wall, the first cavity, the second cavity and the third cavity are sequentially communicated, a bushing mounting hole is formed in the tail end of the front curved wall, a spherical pin mounting hole is formed in the tail end of the rear curved wall, and the central axis of the bushing mounting hole is parallel to the central axis of the spherical pin mounting hole; the steering knuckle mounting bracket and the connecting rod mounting bracket are arranged on the left side face of the trapezoidal arm body in parallel.

As a preferred scheme of hollow trapezoidal arm for passenger car, trapezoidal arm body preceding curved wall reaches back curved wall is integrated into one piece spare, be equipped with two at least sand cleaning holes on the integrated into one piece spare, sand cleaning hole with first cavity, second cavity and the third cavity intercommunication.

As a preferred scheme of the hollow trapezoid arm for the passenger car, the hollow trapezoid arm for the passenger car is a nodular cast iron hollow trapezoid arm, and the tensile strength and the yield strength of the nodular cast iron hollow trapezoid arm are not lower than 800MPa and not lower than 600 MPa.

As a preferable aspect of the hollow ladder arm for a passenger car, the hollow ladder arm for a passenger car further includes: a stabilizer bar connecting rod mounting bracket located on an upper side of the trapezoidal arm body; the first mounting boss is positioned on the upper side surface of the trapezoid arm body, and a first mounting hole communicated with the first cavity is formed in the first mounting boss; and the second mounting boss is positioned on the left side surface of the trapezoidal arm body and between the steering knuckle mounting bracket and the connecting rod mounting bracket, and a second mounting hole communicated with the first cavity is formed in the second mounting boss.

As a preferred scheme of the hollow trapezoid arm for the passenger car, a first boss is arranged on the trapezoid arm body, a second boss is arranged at the tail end of the front bent wall, a third boss is arranged at the tail end of the rear bent wall, the upper side faces of the first boss, the second boss and the third boss are parallel to each other, and the upper side face of the first boss is a first positioning plane.

As a preferred scheme of the hollow trapezoid arm for the passenger car, a fourth boss is arranged on the front side face or the rear side face of the trapezoid arm body, and the front side face of the fourth boss is a second positioning plane.

As a preferable scheme of the hollow trapezoid arm for the passenger car, a fifth boss is arranged on the left side surface of the trapezoid arm body, the left side surface of the second mounting boss is parallel to the left side surface of the fifth boss, the left side surface of the fifth boss is on a third positioning plane, and the first positioning plane, the second positioning plane and the third positioning plane are perpendicular to each other.

As a preferred scheme of the hollow trapezoid arm for the passenger car, the steering knuckle mounting bracket is parallel to the connecting rod mounting bracket, a first bracket hole is formed in the steering knuckle mounting bracket, a second bracket hole is formed in the connecting rod mounting bracket, and the central line axis of the first bracket hole is parallel to the central axis of the second bracket hole.

As a preferred scheme of the hollow trapezoid arm for the passenger car, an annular limiting boss is arranged in the spherical pin mounting hole, the annular limiting boss is convexly arranged in the spherical pin mounting hole, and the spherical pin penetrates through the spherical pin mounting hole and is abutted against the annular limiting boss so that the spherical pin is limited in the spherical pin mounting hole.

The utility model provides a rear suspension, includes sub vehicle frame, bush, sphere round pin, knuckle, connecting rod and above arbitrary scheme passenger car with hollow trapezoidal arm, the bush with the sphere round pin respectively with sub vehicle frame connects, the bush can dismantle connect in the bush mounting hole, the sphere round pin install in the sphere round pin mounting hole, the bush mounting hole with the central axis of sphere round pin mounting hole respectively with the length direction of sub vehicle frame is perpendicular, the knuckle can dismantle connect in on the knuckle installing support, the connecting rod can dismantle connect in on the connecting rod installing support.

The utility model has the advantages that: the utility model discloses a hollow trapezoidal arm for passenger car with trapezoidal arm body, preceding curved wall and the hollow setting of back curved wall, alleviateed the weight of hollow trapezoidal arm for passenger car, the central axis of bush mounting hole and the central axis parallel arrangement of sphere round pin mounting hole can be applicable to the higher condition of rear axle load.

The utility model discloses a back suspension links together sub vehicle frame and hollow trapezoidal arm for passenger car through bush, sphere round pin, knuckle, connecting rod, has increased the stationarity of vehicle operation, prevents tumbling of vehicle.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic view of a hollow ladder-shaped arm for a passenger car according to an embodiment of the present invention in one direction;

FIG. 2 is a schematic view of a hollow ladder arm for a passenger car according to an embodiment of the present invention in another direction;

fig. 3 is a schematic partial structural diagram of a rear suspension according to an embodiment of the present invention.

In the figure:

11. a trapezoidal arm body; 12. a forward curved wall; 121. a bushing mounting hole; 13. a back curved wall; 131. a spherical pin mounting hole; 132. an annular limiting boss;

21. a knuckle mounting bracket; 211. a first bracket hole; 22. a connecting rod mounting bracket; 221. a second bracket hole; 23. a stabilizer bar connecting rod mounting bracket; 231. a third bracket hole; 24. a first mounting boss; 241. a first mounting hole; 25. a second mounting boss; 251. a second mounting hole;

31. a first sand removal hole; 32. a second sand removal hole; 33. a third sand cleaning hole; 34. a fourth sand cleaning hole; 35. a fifth sand removal hole; 36. a sixth sand removal hole; 37. a seventh sand cleaning hole;

41. a first boss; 42. a second boss; 43. a third boss; 44. a fourth boss; 45. a fifth boss;

51. a knuckle; 52. an auxiliary frame; 53. a bushing; 54. a spherical pin; 55. a connecting rod.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to 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 or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a hollow trapezoidal arm for passenger car, this hollow trapezoidal arm for passenger car can be used to passenger car, as shown in fig. 1 and fig. 2, the hollow trapezoidal arm for passenger car of this embodiment includes trapezoidal arm body 11, preceding curved wall 12, back-bending wall 13, knuckle installing support 21, connecting rod installing support 22, be equipped with first cavity on the trapezoidal arm body 11, preceding curved wall 12 and back-bending wall 13 are located the right side of trapezoidal arm body 11 and are located the both ends of trapezoidal arm body 11 respectively, be equipped with the second cavity on the preceding curved wall 12, be equipped with the third cavity on the back-bending wall 13, first cavity, second cavity and third cavity communicate in proper order and form trapezoidal arm cavity. The knuckle mounting bracket 21 and the link mounting bracket 22 are arranged in parallel on the left side surface of the trapezoidal arm body 11, the knuckle mounting bracket 21 is used for mounting the knuckle 51, and the link mounting bracket 22 is used for mounting the link 55. The bush mounting hole 121 is formed in the end of the forward curved wall 12 and used for mounting the bush 53, the diameter of the bush mounting hole 121 is 60mm, the wall thickness of the bush mounting hole is 8mm, the spherical pin mounting hole 131 is formed in the end of the backward curved wall 13 and used for mounting the spherical pin 54, and the central axis of the bush mounting hole 121 is parallel to the central axis of the spherical pin mounting hole 131.

The hollow trapezoidal arm for the passenger car in the embodiment is a nodular cast iron hollow trapezoidal arm, the tensile strength of the nodular cast iron hollow trapezoidal arm can exceed 800MPa, the yield strength is greater than 600MPa, the elongation after fracture is greater than 6%, and the hollow trapezoidal arm is suitable for the condition that the rear axle load is higher.

The hollow trapezoidal arm for a passenger car of the present embodiment is configured such that the trapezoidal arm body, the forward curved wall 12, and the backward curved wall 13 are hollow, the weight of the hollow trapezoidal arm for a passenger car is reduced, the center axis of the bushing mounting hole 121 is parallel to the center axis of the spherical pin mounting hole 131, and the hollow trapezoidal arm for a passenger car can be applied to a case where the rear axle load is high.

Specifically, the thickness of the knuckle mounting bracket 21 of the present embodiment is 17.5mm, the knuckle mounting bracket 21 is parallel to the connecting rod mounting bracket 22, a first bracket hole 211 is formed in the knuckle mounting bracket 21, and the diameter of the first bracket hole 211 is 16.4 mm. The thickness of connecting rod installing support 22 is 20mm, is equipped with second support hole 221 on the connecting rod installing support 22, and the diameter of second support hole 221 is 14.2mm, and the central line axis of first support hole 211 is parallel with the central axis of second support hole 221. As shown in fig. 1, the number of the knuckle mounting brackets 21 and the number of the connecting rod mounting brackets 22 are two, the two knuckle mounting brackets 21 are distributed in parallel, and the two connecting rod mounting brackets 22 are distributed in parallel. The distribution mode is convenient for machining and installation, so that the machining accuracy is higher and the installation is more convenient.

The trapezoidal arm body 11, preceding curved wall 12 and the back curved wall 13 of this embodiment are integrated into one piece, and this integrated into one piece's wall thickness is 8mm, is equipped with two at least sand cleaning holes on the integrated into one piece, two at least sand cleaning hole and trapezoidal arm cavity intercommunication. Of course, in the utility model discloses a in other embodiments, the wall thickness of integrated into one piece is not limited to the 8mm of this embodiment, still can be other thicknesses, and wherein the wall thickness is bigger, and the weight of this hollow trapezoidal arm for passenger car is heavier and its rear axle load that can bear is bigger, and the wall thickness is thinner, and the weight of this hollow trapezoidal arm for passenger car is lighter and its rear axle load that can bear can be less, and concrete wall thickness is selected according to actual decomposition load intensity of structure and CAE simulation result everywhere. The hollow trapezoidal arm for the passenger car of the embodiment is formed by using a sand core in the molding process of the trapezoidal arm. In order to guarantee the shaping of trapezoidal arm cavity and take advantage of the wall thickness of the hollow trapezoidal arm of car and even, when casting the hollow trapezoidal arm of shaping, need fixed psammitolite, two at least sand removal holes of this embodiment can reach this effect, the effect of fixed psammitolite can be played in the casting in-process intercommunication, simultaneously after the casting is accomplished, the sand removal hole is used for clearing up the psammitolite in the blank, consequently need the position and the number in rational design sand removal hole, in order to guarantee product casting manufacturability.

Specifically, as shown in fig. 1 and fig. 2, the number of the sand removing holes in the present embodiment is seven, and the number of the sand removing holes is a first sand removing hole 31, a second sand removing hole 32, a third sand removing hole 33, a fourth sand removing hole 34, a fifth sand removing hole 35, a sixth sand removing hole 36, and a seventh sand removing hole 37. Wherein the first sand removing hole 31 is arranged at the middle position of the two steering knuckle mounting brackets 21, and the diameter of the first sand removing hole 31 is 25 mm. The second sand removing holes 32 are arranged in the bushing mounting holes 121 and are directly communicated with the second chamber, and the sand cores positioned at the front part of the trapezoid arm chamber can be removed by matching the first sand removing holes 31 with the second sand removing holes 32. The connecting position of the bushing mounting hole 121 and the second sand cleaning hole 32 is in smooth connection, and the smooth connection avoids the occurrence of structures such as burrs, bulges and the like, so that the bushing 53 is convenient to press fit at the subsequent position. The third sand removing hole 33 and the fourth sand removing hole 34 are located on the rear side face of the integrally formed part and cross over a parting line, the diameters of the third sand removing hole 33 and the fourth sand removing hole 34 are both 25mm, and sand cores located at the rear part of the trapezoidal arm cavity can be removed through the cooperation of the third sand removing hole 33 and the fourth sand removing hole 34. The fifth sand removing holes 35 are located on the front side face of the integrally formed part and span the parting line, the diameter of the fifth sand removing holes 35 is 25mm, the fifth sand removing holes 35 and the third sand removing holes 33 are close to straight lines in the front-rear direction and are communicated with each other, and the sand removing effect of the integrally formed part in the front-rear direction is guaranteed. Sixth sand removal hole 36 and seventh sand removal hole 37 set up the downside at integrated into one piece spare, and sixth sand removal hole 36 and seventh sand removal hole 37 diameter are 34mm, and sixth sand removal hole 36 and seventh sand removal hole 37 can clear away the psammitolite at integrated into one piece spare middle part, have guaranteed the sand removal effect at hollow trapezoidal arm middle part for passenger car of this embodiment.

Seven sand removal holes of this embodiment can guarantee the steadiness of whole psammitolite when the casting, can also be convenient for clear away the psammitolite in the trapezoidal arm cavity, convenient operation, swift. In order to ensure the strength of the hollow trapezoid arm for the passenger car, the edge of each sand cleaning hole is provided with a platform structure with different widths from 3mm to 6mm, the outer edge of each sand cleaning hole is provided with a transition fillet, and the radius of each transition fillet is between 6mm and 8mm, so that the phenomenon of stress concentration around the sand cleaning holes is prevented, and failure cracks around the sand cleaning holes in the using process are avoided. Of course, in the utility model discloses an in other embodiments, the number in sand removal hole is not limited to seven of this embodiment, and the distribution mode in sand removal hole is also not limited to this kind of distribution of this embodiment, specifically sets up according to actual need, as long as these sand removal holes can play the location psammitolite before the casting and can thoroughly clear away the psammitolite in trapezoidal arm cavity after the casting is accomplished can, specifically set up according to actual need.

As shown in fig. 1, the hollow trapezoidal arm for a passenger car of this embodiment further includes a stabilizer link mounting bracket 23, a first mounting boss 24, and a second mounting boss 25, the stabilizer link mounting bracket 23 is located on the upper side surface of the trapezoidal arm body 11, the first mounting boss 24 is located on the upper side surface of the trapezoidal arm body 11, and a first mounting hole 241 communicating with the first chamber is formed thereon. The first mounting holes 241 of this embodiment are threaded holes, the number of which is two, the diameters of the two threaded holes are 6mm, and the first mounting bosses 24 of this embodiment are used for mounting a wire harness. The second mounting boss 25 is located on the left side surface of the trapezoid arm body 11 and located between the knuckle mounting bracket 21 and the connecting rod mounting bracket 22, the second mounting boss 25 is provided with second mounting holes 251 communicated with the first chamber and used for mounting a wire harness, the number of the second mounting holes 251 in the embodiment is two, one of the second mounting holes 251 is a threaded hole with a diameter of 6mm, and the other second mounting hole 251 is an unthreaded hole with a diameter of 5 mm.

Specifically, be equipped with third stake hole 231 on stabilizer bar connecting rod installing support 23, the diameter of third stake hole 231 is 12.5mm, and stabilizer bar connecting rod installing support 23's edge is equipped with the chamfer that the radius is 0.5mm, and stabilizer bar connecting rod installing support 23's root is equipped with the fillet, and the radius of fillet is greater than 5mm to make stabilizer bar connecting rod installing support 23 and trapezoidal arm body smooth connection.

In order to accurately position the hollow trapezoidal arm for the passenger car in the machining process, bosses are respectively arranged on the trapezoidal arm body 11, the front bent wall 12 and the rear bent wall 13 of the embodiment. Specifically, as shown in fig. 1, the upper side surface of the trapezoidal arm body 11 is provided with two first bosses 41, the number of the first bosses 41 is two, the two first bosses 41 are respectively located at the front end and the rear end of the left trapezoidal arm body 11, the upper side surface of the tail end of the front curved wall 12 is provided with a second boss 42, the upper side surface of the tail end of the rear curved wall 13 is provided with a third boss 43, the upper side surfaces of the first boss 41, the second boss 42 and the third boss 43 are different in height and distributed in a trapezoidal shape, and the upper side surface of the first boss 41 is a first positioning plane. Correspondingly, bosses corresponding to the first boss 41, the second boss 42 and the third boss 43 are respectively arranged on the lower side surfaces of the trapezoidal arm body 11, the front bent wall 12 and the rear bent wall 13, so that positioning and clamping of the lower side surfaces are realized, and machining precision is guaranteed. Of course, in other embodiments of the present invention, the number of the first bosses 41 is not limited to two in this embodiment, and may be one or at least three, when one first boss 41 is provided, the first boss 41 is located in the middle of the left trapezoidal arm body 11, and when at least three first bosses 41 are provided, the three first bosses 41 may be distributed on the trapezoidal arm body 11 in a relatively dispersed manner. Of course, in other embodiments of the present invention, limited by the hollow trapezoid arm structure for the passenger car, the upper sides of the first boss 41, the second boss 42 and the third boss 43 may be on the same plane, that is, the upper sides of the first boss 41, the second boss 42 and the third boss 43 are on the first positioning plane, and the arrangement is specifically determined according to actual requirements.

As shown in fig. 2, a fourth boss 44 is disposed on the front side surface of the integrally formed part of this embodiment, the front side surface of the fourth boss 44 is a second positioning plane, and the number of the fourth bosses 44 may be one, two, or more than two, and is specifically selected according to actual needs. Of course, in other embodiments of the present invention, the fourth boss 44 may be disposed on the rear side of the integrally formed member, and at this time, the rear side of the fourth boss 44 is the second positioning plane.

As shown in fig. 1 and 2, a fifth boss 45 is disposed on the left side surface of the trapezoid arm body 11 of the present embodiment, the fifth boss 45 is located at the root of the second mounting boss 25, the left side surface of the second mounting boss 25 is parallel to the left side surface of the fifth boss 45, the left side surface of the fifth boss 45 is a third positioning plane, wherein the first positioning plane, the second positioning plane and the third positioning plane are perpendicular to each other to serve as a positioning reference for machining the hollow trapezoid arm for a passenger car of the present embodiment, so as to improve the machining accuracy.

In the present embodiment, an annular limiting boss 132 is disposed in the spherical pin mounting hole 131, the annular limiting boss 132 is located in the spherical pin mounting hole 131, and the spherical pin 54 passes through the spherical pin mounting hole 131 and abuts against the annular limiting boss 132, so that the spherical pin 54 is limited in the spherical pin mounting hole 131. Specifically, the diameter of the spherical pin mounting hole 131 is 59.3mm, the width of the annular limiting boss 132 is 3.65mm, and the diameter of the limiting hole is 52 mm.

As shown in fig. 3, the present embodiment further provides a rear suspension, which includes a subframe 52, a bushing 53, a spherical pin 54, a knuckle 51, a connecting rod 55, and the hollow trapezoid arm for a passenger car according to the present embodiment, wherein the bushing 53 and the spherical pin 54 are respectively connected to the subframe 52, the bushing 53 is detachably connected to the bushing mounting hole 121 by a bolt, the spherical pin 54 is mounted to the spherical pin mounting hole 131, the knuckle 51 is detachably connected to the knuckle mounting bracket 21 by a bolt, and the connecting rod 55 is detachably connected to the connecting rod mounting bracket 22. The knuckle 51, the link 55, the bush 53, and the spherical pin 54 are located at four corners of the hollow trapezoidal arm for the passenger car. The embodiment adopts the bush 53 and the spherical pin 54 to be matched for use, so that the service life of the bush 53 is longer, and simultaneously, the accuracy of the motion parameters of the rear wheels and the running reliability of the whole vehicle are improved.

The spherical pin 54 of the embodiment includes a spherical pin 54 body and an annular boss protruding from the spherical pin 54 body, when the spherical pin 54 is installed, the spherical pin 54 is pressed in from one side of the spherical pin installation hole 131 far away from the annular limiting boss 132, the spherical pin 54 can be respectively in interference fit with the spherical pin installation hole 131 and the limiting hole, a limiting ring is arranged on the front end face of the spherical pin installation hole 131, and the limiting ring can play a role in blocking the spherical pin 54 when the spherical pin 54 is pulled forward. The annular limiting boss 132 can make the annular boss of the spherical pin 54 fit with the front end face of the annular limiting boss 132 when the spherical pin 54 is pulled backwards, so as to prevent the spherical pin 54 from falling off from the spherical pin mounting hole 131. The annular limit boss 132 and the limit ring thus added can limit the movement of the spherical pin 54 in the front and rear two directions, respectively, increasing the reliability of the connection between the spherical pin 54 and the spherical pin mounting hole 131.

The connection mode of the spherical pin 54 and the hollow trapezoid arm for the passenger car in the embodiment can be equivalent to rigid connection, so that the deformation of the hollow trapezoid arm for the passenger car under a large-load working condition is avoided, the movement accuracy of the rear wheel is ensured, and the running reliability of the car is greatly improved.

The extending directions of the bushing 53 and the subframe 52 of the embodiment tend to be parallel to the Y direction shown in fig. 3, the Y direction is the length direction of the subframe 52, the extending directions of the spherical pin 54 and the subframe 52 also tend to be parallel to the Y direction shown in fig. 3, the structural design plays a role in reducing the first axial load, the stresses in the two directions of the first axial load and the first radial load are balanced, the reliability of the rear spherical pin 54 is effectively improved, the second axial load of the bushing 53 is reduced by 50%, the service life of the bushing 53 is prolonged, and the reliability of the bushing 53 is improved. Specifically, in the rear suspension of the present embodiment, the center axis of the bushing mounting hole 121 and the center axis of the spherical pin mounting hole 131 of the hollow trapezoidal arm for a passenger vehicle are perpendicular to the longitudinal direction of the subframe 52, which is the longitudinal direction of the subframe 52, i.e., the longitudinal direction of the present embodiment is the same as the radial direction of the hollow trapezoidal arm for a passenger vehicle.

The rear suspension of this embodiment is applicable to the passenger car product that rear axle load is being greater than 2.5 tons, the utility model discloses a rear suspension links together sub vehicle frame 52 and passenger car with hollow trapezoidal arm through bush 53, spherical pin 54, knuckle 51, connecting rod 55, has increased the stationarity of vehicle operation, prevents the tipping over of vehicle.

In the present embodiment, the terms indicating the directions such as "upper side", "lower side", "left side", "right side", "front side" and "rear side" are defined in addition to fig. 1.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A hollow ladder arm for a passenger vehicle, the hollow ladder arm comprising:

the device comprises a trapezoid arm body (11), wherein a first cavity is arranged on the trapezoid arm body (11);

the device comprises a front bent wall (12) and a rear bent wall (13), wherein the front bent wall (12) and the rear bent wall (13) are arranged on the right side of a trapezoidal arm body (11) and are respectively positioned at two ends of the trapezoidal arm body (11), a second cavity is arranged on the front bent wall (12), a third cavity is arranged on the rear bent wall (13), the first cavity, the second cavity and the third cavity are sequentially communicated, a lining mounting hole (121) is arranged at the tail end of the front bent wall (12), a spherical pin mounting hole (131) is arranged at the tail end of the rear bent wall (13), and the central axis of the lining mounting hole (121) is parallel to the central axis of the spherical pin mounting hole (131);

the steering knuckle mounting bracket (21) and the connecting rod mounting bracket (22) are arranged on the left side face of the trapezoid arm body (11) in parallel, and the steering knuckle mounting bracket (21) and the connecting rod mounting bracket (22) are arranged on the left side face of the trapezoid arm body in parallel.

2. The hollow trapezoidal arm for passenger cars according to claim 1, characterized in that the trapezoidal arm body (11), the front curved wall (12) and the rear curved wall (13) are an integral molding, and at least two sand cleaning holes are provided on the integral molding, and the sand cleaning holes are communicated with the first chamber, the second chamber and the third chamber.

3. The hollow trapezoidal arm for passenger cars as claimed in claim 2, wherein the hollow trapezoidal arm for passenger cars is a hollow trapezoidal arm made of nodular cast iron, and the tensile strength and yield strength of the hollow trapezoidal arm made of nodular cast iron are not less than 800MPa and not less than 600 MPa.

4. The hollow ladder arm for a passenger vehicle of claim 1, further comprising:

a stabilizer bar connecting rod mounting bracket (23) located on an upper side of the trapezoidal arm body (11);

a first mounting boss (24) located on an upper side of the trapezoidal arm body (11) and provided with a first mounting hole (241) communicating with the first chamber;

and the second mounting boss (25) is positioned on the left side surface of the trapezoid arm body (11) and is positioned between the steering knuckle mounting bracket (21) and the connecting rod mounting bracket (22), and a second mounting hole (251) communicated with the first cavity is formed in the second mounting boss (25).

5. The hollow trapezoid arm for the passenger car according to claim 4, wherein a first boss (41) is provided on the trapezoid arm body (11), a second boss (42) is provided at the end of the front curved wall (12), a third boss (43) is provided at the end of the rear curved wall (13), the upper sides of the first boss (41), the second boss (42) and the third boss (43) are parallel to each other, and the upper side of the first boss (41) is a first positioning plane.

6. The hollow trapezoidal arm for passenger cars according to claim 5, characterized in that the front side or the rear side of the trapezoidal arm body (11) is provided with a fourth boss (44), and the front side of the fourth boss (44) is a second positioning plane.

7. The hollow trapezoid arm for the passenger car according to claim 6, wherein a fifth boss (45) is provided on a left side surface of the trapezoid arm body (11), a left side surface of the second mounting boss (25) is parallel to a left side surface of the fifth boss (45), and a left side surface of the fifth boss (45) is on a third positioning plane, wherein the first positioning plane, the second positioning plane and the third positioning plane are perpendicular to each other.

8. The hollow ladder arm for passenger cars according to claim 1, characterized in that the knuckle mounting bracket (21) is parallel to the link mounting bracket (22), the knuckle mounting bracket (21) is provided with a first bracket hole (211), the link mounting bracket (22) is provided with a second bracket hole (221), and a centerline axis of the first bracket hole (211) is parallel to a center axis of the second bracket hole (221).

9. The hollow trapezoid arm for passenger car according to claim 1, wherein an annular limiting boss (132) is provided in the spherical pin mounting hole (131), the annular limiting boss (132) is protruded into the spherical pin mounting hole (131), and a spherical pin (54) passes through the spherical pin mounting hole (131) and abuts against the annular limiting boss (132) to limit the spherical pin (54) in the spherical pin mounting hole (131).

10. A rear suspension, characterized by comprising a sub-frame (52), a bushing (53), a spherical pin (54), a knuckle (51), a link (55), and the hollow ladder arm for a passenger car according to any one of claims 1 to 9, wherein the bushing (53) and the spherical pin (54) are respectively connected to the sub-frame (52), the bushing (53) is detachably connected to the bushing mounting hole (121), the spherical pin (54) is mounted to the spherical pin mounting hole (131), the central axes of the bushing mounting hole (121) and the spherical pin mounting hole (131) are respectively perpendicular to the longitudinal direction of the sub-frame (52), the knuckle (51) is detachably connected to the knuckle mounting bracket (21), and the link (55) is detachably connected to the link mounting bracket (22).