CN107985402B

CN107985402B - Knuckle connecting system

Info

Publication number: CN107985402B
Application number: CN201711464823.XA
Authority: CN
Inventors: 郑锐; 马冲冲; 周一欣
Original assignee: Dongfeng Trucks Co ltd
Current assignee: Dongfeng Trucks Co ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2023-05-12
Anticipated expiration: 2037-12-28
Also published as: CN107985402A

Abstract

The utility model provides a knuckle connected system, includes knuckle support, knuckle, vertical elastic element, goes up swing arm and lower swing arm, the knuckle support includes bottom tray, hollow section of thick bamboo and support body, and the top of support body, bottom are connected with the frame through last swing arm, lower swing arm respectively, and hollow section of thick bamboo is connected with the inside steering engine assembly that sets up of frame through the knuckle, and bottom tray cooperates with the top tray in order to introduce vertical elastic element, and the top tray is connected with the frame through top installing support, and vertical elastic element is the acute angle with the frame in the vertical direction. The design is strong in bearing capacity, small in occupied space, strong in stability and high in reliability, and is smooth in guiding effect, high in strength and light in weight, so that the control stability and the driving smoothness of the whole vehicle are facilitated.

Description

Knuckle connecting system

Technical Field

The invention relates to a steering knuckle system, belongs to the field of single front axles of commercial vehicles, and particularly relates to a steering knuckle connecting system which is particularly suitable for improving bearing capacity and reducing occupied space.

Background

At present, a front axle of a cargo truck commonly adopts a leaf spring non-independent suspension, which has the advantages of simple structure, low cost and the like, but the stability and smoothness of the operation of the whole truck are poor due to the reasons of mutual influence of wheel runout at two sides, larger friction between leaf springs of the leaf springs, large non-sprung mass and the like, and in addition, the introduction and application of other types of suspensions, such as an air suspension, an independent suspension and the like, are limited due to the characteristics of larger axle load and limited arrangement space of the cargo truck.

The invention patent application with publication number CN106394154A and publication date 2017, 2 and 15 discloses a commercial vehicle single front axle structure with independent suspensions, which comprises a left independent suspension and a right independent suspension which are symmetrically arranged, wherein the left independent suspension is connected with the right independent suspension through a vehicle frame; the frame comprises a left longitudinal beam and a right longitudinal beam which are symmetrically arranged, and the left longitudinal beam is fixedly connected with the right longitudinal beam through a front pocket beam and a rear pocket beam respectively; the independent suspension is respectively connected with the front pocket beam and the rear pocket beam through a connecting bracket and four leaf springs, and the bottom of the connecting bracket is connected with the longitudinal beam through a shock absorber; the steering engine assembly is connected with the steering knuckle. While this design improves the load bearing characteristics to some extent, it still has the following drawbacks:

firstly, a connecting bracket is used for connecting a frame and a steering knuckle, a plate spring connected to the connecting bracket is used as a bearing component, the plate spring and the frame are in the transverse direction, the bearing capacity is not strong, and the bearing requirement of a large axle load of a medium-heavy truck is difficult to meet;

secondly, the plate spring in the design is divided into a left part and a right part, each part comprises an upper layer and a lower layer, the occupied space is large, and the plate spring is not consistent with the characteristic of limited arrangement space of a medium-heavy truck;

and the plate spring in the patent is not only a guide element but also a bearing element, which is easy to cause the change range of the wheel positioning parameters to be increased, thereby influencing the operation stability of the whole vehicle and reducing the reliability.

The disclosure of this background section is only intended to increase the understanding of the general background of the present patent application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The invention aims to overcome the defects and problems of weak bearing capacity and large occupied space in the prior art and provide a knuckle connecting system with strong bearing capacity and small occupied space.

In order to achieve the above object, the technical solution of the present invention is: the steering knuckle connecting system comprises a steering knuckle bracket, a steering knuckle and an external connecting device, wherein the steering knuckle bracket is connected with a frame through the external connecting device, the steering knuckle bracket is connected with a steering engine assembly through the steering knuckle, and the steering engine assembly is arranged in the frame;

the steering knuckle bracket comprises a bottom tray, a hollow cylinder and an L-shaped bracket body, wherein the bracket body comprises a bottom bracket arm and a side bracket arm which are connected with each other, the inner end of the bottom bracket arm is connected with the bottom of the bottom tray, the outer end of the bottom bracket arm is connected with the bottom end of the side bracket arm, the top end of the side bracket arm is hinged with an outer connecting device through an eccentric pin, the joint of the proximal bracket arm and the outer connecting device on the outer side surface of the side bracket arm is connected with the outer cylinder wall of the hollow cylinder, the inner cylinder wall of the hollow cylinder is connected with the steering knuckle through a steering main pin, the joint of the proximal bracket arm and the bottom bracket arm on the bottom end of the side bracket arm is hinged with the outer connecting device, a vibration damping column is arranged on the side bracket arm and between the top end and the bottom end of the side bracket arm, the vibration damping column is hinged with one end of a vibration damper assembly, the other end of the vibration damper assembly is hinged with the outer side surface of a top mounting bracket, the inner side surface of the top mounting bracket is connected with a frame, the bottom of the top mounting bracket is connected with the outer bottom surface of the top tray, the inner bottom surface of the top mounting bracket is connected with the top bottom surface of the longitudinal elastic element, and the bottom surface of the top tray is connected with the bottom surface of the longitudinal elastic element.

The inner bottom surface of the top tray is connected with the upper limit rubber through an upper limit block, the inner bottom surface of the bottom tray is connected with the lower limit rubber through a lower limit block, the top end and the bottom end of the longitudinal elastic element are respectively sleeved outside the upper limit block and the lower limit block, the upper limit block and the upper limit rubber are vulcanized into a whole, and the lower limit block and the lower limit rubber are vulcanized into a whole.

The parts of the inner bottom surfaces of the top tray and the bottom tray, which are contacted with the longitudinal elastic elements, are respectively provided with an upper rubber pad and a lower rubber pad.

The steering main pin sequentially passes through the steering knuckle and the inner cavity of the hollow cylinder from top to bottom and then is connected with the thrust bearing, and the steering knuckle is connected with a steering machine assembly arranged in the frame through the steering swing arm.

The outer connecting device comprises an upper swing arm and a lower swing arm which are arranged in parallel up and down, the upper swing arm and the lower swing arm are of U-shaped structures, an upper left front arm foot and an upper left rear arm foot of the upper swing arm are connected with a frame, an upper right arm foot of the upper swing arm is connected with the top end of a side support arm through an eccentric pin, the joint of a near side support arm and a bottom support arm on the bottom end of the side support arm is connected with a lower arm seat arranged on a lower right arm foot of the lower swing arm, a lower left front arm foot and a lower left rear arm foot of the lower swing arm are connected with the frame, the bottom end of a longitudinal elastic element is contacted with the inner bottom surface of the bottom tray, and the top end of the longitudinal elastic element is connected with a top tray after passing through a gap between the upper left front arm foot and the upper left rear arm foot from bottom to top.

The upper left forearm leg, the upper left rear arm leg, the lower left forearm leg and the lower left rear arm leg are internally and penetratingly embedded with a first rubber bushing, a second rubber bushing, a third rubber bushing and a fourth rubber bushing which are in one-to-one correspondence.

The axial leads of the first rubber bushing and the second rubber bushing are coaxial, and the axial leads of the third rubber bushing and the fourth rubber bushing are coaxial.

The distance between the axes of the revolute pairs of the upper swing arm and the lower swing arm is smaller than or equal to that of the revolute pairs of the lower swing arm, and an upper counter bore groove and a lower counter bore groove are respectively formed in the upper swing arm and the lower swing arm.

The eccentric pin comprises a front locking disc, a pin body structure, a pin cover body and a rear locking disc, wherein the pin body structure comprises a locking cap, a pin seat, a front pin shaft, a middle pin shaft and a rear pin shaft which are sequentially connected, the interior of the locking cap, the pin seat, the front pin shaft and the interior of the middle pin shaft are provided with the same grease nipple mounting cavity, the middle pin shaft is provided with a lubricating oil hole communicated with the grease nipple mounting cavity, the end face of the rear pin shaft is provided with a pin shaft connecting hole, the pin cover body comprises a locking cover and a pin cover seat which are sequentially connected, the locking cover is provided with a cover through hole, and the pin cover seat is internally provided with a through pin shaft inserting hole for being in inserted fit with the rear pin shaft.

Front connecting holes connected with the upper right arm feet are formed in the tray wall of the front locking tray, front locking holes matched with the locking caps in a locking mode are formed in the front locking tray, rear connecting holes connected with the upper right arm feet are formed in the tray wall of the rear locking tray, rear locking holes matched with the locking caps in a locking mode are formed in the rear locking tray, pin shaft connecting holes are connected with one ends of fixing bolts, and the other ends of the fixing bolts penetrate through the cover through holes and are fixedly connected with the outer walls of the locking caps.

Compared with the prior art, the invention has the beneficial effects that:

1. in the knuckle connecting system, the knuckle support comprises the bottom tray, the hollow cylinder and the support body, the bottom tray and the top tray cooperate to introduce the longitudinal elastic element, the top tray is connected with the frame through the top mounting support, the top end and the bottom end of the support body are connected with the frame through the external connecting device, the hollow cylinder is connected with the steering engine assembly through the knuckle, when the knuckle connecting system is used, the longitudinal elastic element is longitudinally arranged and forms an acute angle with the frame in the vertical direction, compared with a leaf spring adopted in the prior art, the longitudinal elastic element not only can greatly improve the bearing capacity, but also can reduce the unsprung quality, avoid friction among leaf springs, and has the advantages of low cost, high reliability, small arrangement space and the like compared with an air spring adopted in the prior art, and is more suitable for popularization and application on the prior domestic trucks. Therefore, the invention has the advantages of strong bearing capacity, small occupied space, strong stability and high reliability.

2. In the knuckle connecting system, the external connecting device comprises the upper swing arm and the lower swing arm which are arranged in parallel up and down, the upper swing arm and the lower swing arm are specially arranged to serve as special guiding mechanisms so as to be beneficial to the connection of a knuckle and a frame, and the bearing capacity of a longitudinal elastic element is exerted. Therefore, the invention has smooth guiding effect, high strength and high reliability, can ensure bearing capacity and is beneficial to realizing the control stability and the driving smoothness of the whole vehicle.

3. In the knuckle connecting system, the distance between the axis of the revolute pair of the upper swing arm and the axis of the revolute pair of the lower swing arm is smaller than or equal to the distance between the axis of the revolute pair of the lower swing arm, and the design can bring better rigidity of a suspension mechanism, so that the strength and the reliability of the whole structure are improved, and simultaneously, counter bore grooves can be formed in the upper swing arm and the lower swing arm to realize light weight. Therefore, the invention has high strength and good light weight effect.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of fig. 1 in elevation.

Fig. 3 is a schematic perspective view of the knuckle mount of fig. 1.

Fig. 4 is a schematic illustration of the connection of the knuckle mount to the knuckle of the present invention.

Fig. 5 is a schematic view of the eccentric pin of fig. 1.

Fig. 6 is a schematic view of the pin structure of fig. 5.

Fig. 7 is a schematic view of the structure of the pin cover of fig. 5.

Fig. 8 is a schematic view of the connection of the eccentric pin to the upper right arm foot of fig. 1.

Fig. 9 is a cross-sectional view of the eccentric pin of fig. 8 after connection of the upper right arm foot.

FIG. 10 is a schematic view of the assembly of the present invention with a vehicle frame.

In the figure: the steering device comprises a longitudinal elastic element 1, an outer connecting device 2, a top mounting bracket 3, a top tray 31, an upper limiting block 32, an upper limiting rubber 33, a lower limiting block 34, a lower limiting rubber 35, a steering engine assembly 4, a steering knuckle bracket 5, a bracket body 51, a bottom bracket arm 52, a side bracket arm 53, a hollow cylinder 54, a bottom tray 55, a damping post 56, a steering knuckle 6, a steering main pin 61, a thrust bearing 62, a steering swing arm 63, an upper swing arm 7, an upper left front arm foot 71, an upper left rear arm foot 72, an upper right arm foot 73, a first rubber bushing 74, a second rubber bushing 75, an upper counterbore groove 77, a lower swing arm 8, a lower left front arm foot 81, a lower left rear arm foot 82, a lower right arm foot 83, a third rubber bushing 84, a fourth rubber bushing 85, a lower arm seat 86, a lower bracket groove 87, an eccentric pin 9, a front locking disc 91, a front connecting hole 911, a front locking hole 912, a steering knuckle body structure 92, a locking cap 921, a pin seat 922, a front pin shaft 923, a middle pin 923, a rear pin shaft, a rear mounting cavity 926, a grease nipple cover 96, a lower grease fitting hole 93, a lower cover 93, a grease fitting hole 93, a shock absorbing cover 93, a lower stud 93, a shock absorbing cover 93, a 10, a locking pin hole 93, a shock absorbing cover assembly 93, a lower mount pad 93, and a through hole 93, and a shock absorbing attachment hole 95.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 10, a knuckle connection system includes a knuckle bracket 5, a knuckle 6, and an external connection device 2, the knuckle bracket 5 is connected to a frame 13 via the external connection device 2, the knuckle bracket 5 is connected to a steering assembly 4 via the knuckle 6, and the steering assembly 4 is disposed inside the frame 13;

the knuckle bracket 5 comprises a bottom tray 55, a hollow cylinder 54 and an L-shaped bracket body 51, wherein the bracket body 51 comprises a bottom bracket arm 52 and a side bracket arm 53 which are connected with each other, the inner end of the bottom bracket arm 52 is connected with the bottom of the bottom tray 55, the outer end of the bottom bracket arm 52 is connected with the bottom end of the side bracket arm 53, the top end of the side bracket arm 53 is hinged with the outer connecting device 2 through an eccentric pin 9, the joint between the proximal bracket arm 53 and the outer connecting device 2 on the outer side surface of the side bracket arm 53 is connected with the outer cylinder wall of the hollow cylinder 54, the inner cylinder wall of the hollow cylinder 54 is connected with the knuckle 6 through a steering main pin 61, the joint between the proximal bracket arm 53 and the bottom bracket arm 52 is hinged with the outer connecting device 2, a vibration damping column 56 is arranged on the side bracket arm 53 and is hinged with one end of the vibration damper assembly 10, the other end of the vibration damper assembly 10 is hinged with the outer side surface of the top mounting bracket 3, the inner side surface of the top mounting bracket 3 is connected with the inner side surface of the top bracket 3 and the bottom surface of the inner bracket 31 is connected with the bottom surface of the bottom tray 31 of the inner bracket 1, and the bottom surface of the inner bracket element 31 is connected with the bottom surface of the inner bottom tray 1.

The inner bottom surface of the top tray 31 is connected with the upper limit rubber 33 through the upper limit block 32, the inner bottom surface of the bottom tray 55 is connected with the lower limit rubber 35 through the lower limit block 34, the top end and the bottom end of the longitudinal elastic element 1 are respectively sleeved outside the upper limit block 32 and the lower limit block 34, the upper limit block 32 and the upper limit rubber 33 are vulcanized into a whole, and the lower limit block 34 and the lower limit rubber 35 are vulcanized into a whole.

The upper rubber pad 11 and the lower rubber pad 12 are respectively arranged at the contact parts with the longitudinal elastic element 1 on the inner bottom surfaces of the top tray 31 and the bottom tray 55.

The steering main pin 61 sequentially passes through the steering knuckle 6 and the inner cavity of the hollow cylinder 54 from top to bottom and then is connected with the thrust bearing 62, and the steering knuckle 6 is connected with the steering assembly 4 arranged in the frame 13 through the steering swing arm 63.

The outer connecting device 2 comprises an upper swing arm 7 and a lower swing arm 8 which are arranged in parallel up and down, the upper swing arm 7 and the lower swing arm 8 are of U-shaped structures, an upper left front arm leg 71 and an upper left rear arm leg 72 of the upper swing arm 7 are connected with the frame 13, an upper right arm leg 73 of the upper swing arm 7 is connected with the top end of the side support arm 53 through an eccentric pin 9, the joint of the upper proximal support arm 53 and the bottom support arm 52 at the bottom end of the side support arm 53 is connected with a lower arm seat 86 arranged on a lower right arm leg 83 of the lower swing arm 8, a lower left front arm leg 81 and a lower left rear arm leg 82 of the lower swing arm 8 are connected with the frame 13, the bottom end of the longitudinal elastic element 1 is contacted with the inner bottom surface of the bottom tray 55, and the top end of the longitudinal elastic element 1 is connected with the top tray 31 after passing through a gap between the upper left front arm leg 71 and the upper left rear arm leg 72 from bottom to top.

The upper left forearm leg 71, the upper left rear arm leg 72, the lower left forearm leg 81, and the lower left rear arm leg 82 are embedded with a first rubber bushing 74, a second rubber bushing 75, a third rubber bushing 84, and a fourth rubber bushing 85, which are in one-to-one correspondence.

The axes of the first rubber bush 74 and the second rubber bush 75 are coaxial, and the axes of the third rubber bush 84 and the fourth rubber bush 85 are coaxial.

The distance between the axes of the revolute pairs of the upper swing arm 7 and the lower swing arm 8 is smaller than or equal to the distance between the axes of the revolute pairs of the lower swing arm 8, and an upper counter bore groove 77 and a lower counter bore groove 87 are respectively arranged on the upper swing arm 7 and the lower swing arm 8.

The eccentric pin 9 comprises a front locking disc 91, a pin body structure 92, a pin cover 93 and a rear locking disc 94, the pin body structure 92 comprises a locking cap 921, a pin seat 922, a front pin shaft 923, a middle pin shaft 924 and a rear pin shaft 925 which are sequentially connected, the interior of the locking cap 921, the pin seat 922, the interior of the front pin shaft 923 and the interior of the middle pin shaft 924 are provided with the same grease nipple mounting cavity 926, the middle pin shaft 924 is provided with a lubricating oil hole 927 communicated with the grease nipple mounting cavity 926, the end face of the rear pin shaft 925 is provided with a pin shaft connecting hole 928, the pin cover 93 comprises a locking cover 931 and a pin cover seat 932 which are sequentially connected, the locking cover 931 is provided with a cover through hole 933, and the pin cover seat 932 is internally provided with a through pin shaft inserting hole 934 for being inserted and matched with the rear pin shaft 925.

Front connecting holes 911 connected with the upper right arm leg 73 are formed in the tray wall of the front locking tray 91, front locking holes 912 in locking fit with the locking caps 921 are formed in the front locking tray 91, rear connecting holes 941 connected with the upper right arm leg 73 are formed in the tray wall of the rear locking tray 94, rear locking holes 942 in locking fit with the locking caps 931 are formed in the rear locking tray 94, pin shaft connecting holes 928 are connected with one end of the fixing bolts 95, and the other ends of the fixing bolts 95 penetrate through the cover through holes 933 and are fixedly connected with the outer walls of the locking caps 931.

The principle of the invention is explained as follows:

the shock absorber assembly is positioned at the front end of the symmetrical center of the wheel, and the technical characteristic can avoid interference with the structure of the wheel.

The parts of the inner bottom surfaces of the top tray and the bottom tray, which are contacted with the longitudinal elastic elements, are respectively provided with an upper rubber pad and a lower rubber pad, and the technical characteristics can achieve the effects of reducing contact stress and avoiding abnormal noise.

The rubber bushings in the upper left forearm leg, the upper left rear arm leg, the lower left forearm leg and the lower left rear arm leg, which are embedded with the first rubber bushing, the second rubber bushing, the third rubber bushing and the fourth rubber bushing in a one-to-one correspondence manner, are used as revolute pairs.

Example 1:

the steering knuckle connecting system comprises a steering knuckle bracket 5, a steering knuckle 6 and an external connecting device 2, wherein the steering knuckle bracket 5 is connected with a frame 13 through the external connecting device 2, the steering knuckle bracket 5 is connected with a steering engine assembly 4 through the steering knuckle 6, and the steering engine assembly 4 is arranged in the frame 13;

Example 2:

the basic content is the same as in example 1, except that:

the inner bottom surface of the top tray 31 is connected with the upper limit rubber 33 through the upper limit block 32, the inner bottom surface of the bottom tray 55 is connected with the lower limit rubber 35 through the lower limit block 34, the top end and the bottom end of the longitudinal elastic element 1 are respectively sleeved outside the upper limit block 32 and the lower limit block 34, the upper limit block 32 and the upper limit rubber 33 are vulcanized into a whole, and the lower limit block 34 and the lower limit rubber 35 are vulcanized into a whole. The upper rubber pad 11 and the lower rubber pad 12 are respectively arranged at the contact parts with the longitudinal elastic element 1 on the inner bottom surfaces of the top tray 31 and the bottom tray 55.

Example 3:

the basic content is the same as in example 1, except that:

Example 4:

the basic content is the same as in example 1, except that:

Example 5:

the basic content is the same as in example 4, except that:

the upper left forearm leg 71, the upper left rear arm leg 72, the lower left forearm leg 81, and the lower left rear arm leg 82 are embedded with a first rubber bushing 74, a second rubber bushing 75, a third rubber bushing 84, and a fourth rubber bushing 85, which are in one-to-one correspondence. The axes of the first rubber bush 74 and the second rubber bush 75 are coaxial, and the axes of the third rubber bush 84 and the fourth rubber bush 85 are coaxial. The distance between the axes of the revolute pairs of the upper swing arm 7 and the lower swing arm 8 is smaller than or equal to the distance between the axes of the revolute pairs of the lower swing arm 8, and an upper counter bore groove 77 and a lower counter bore groove 87 are respectively arranged on the upper swing arm 7 and the lower swing arm 8.

Example 6:

the basic content is the same as in example 1, except that:

Example 7:

the basic content is the same as in example 6, except that:

Claims

1. The utility model provides a knuckle connected system, includes knuckle support (5), knuckle (6) and external connection device (2), knuckle support (5) are connected with frame (13) through external connection device (2), and knuckle support (5) are connected with steering engine assembly (4) through knuckle (6), and steering engine assembly (4) set up in the inside of frame (13), its characterized in that:

the knuckle bracket (5) comprises a bottom tray (55), a hollow cylinder (54) and an L-shaped bracket body (51), the bracket body (51) comprises a bottom bracket arm (52) and a side bracket arm (53) which are connected with each other, the inner end of the bottom bracket arm (52) is connected with the bottom of the bottom tray (55), the outer end of the bottom bracket arm (52) is hinged with the bottom end of the side bracket arm (53), the top end of the side bracket arm (53) is hinged with an outer connecting device (2) through an eccentric pin (9), the joint of the proximal bracket arm (53) and the outer connecting device (2) on the outer side surface of the side bracket arm (53) is connected with the outer cylinder wall of the hollow cylinder (54), the inner cylinder wall of the hollow cylinder (54) is connected with the knuckle (6) through a steering main pin (61), the joint of the proximal bracket arm (53) and the bottom bracket arm (52) is hinged with the outer connecting device (2), the joint of the side bracket (53) is provided with a top end, the vibration damper assembly (10) is arranged between the top end and the top bracket (3) on the bottom end of the side bracket (53), the vibration damper assembly is connected with the top bracket (10) on the side surface (13), the bottom of the top mounting bracket (3) is connected with the outer bottom surface of the top tray (31), the inner bottom surface of the top tray (31) is connected with the top end of the longitudinal elastic element (1), and the bottom end of the longitudinal elastic element (1) is contacted with the inner bottom surface of the bottom tray (55);

the steering main pin (61) sequentially penetrates through the inner cavities of the steering knuckle (6) and the hollow cylinder (54) from top to bottom and then is connected with the thrust bearing (62), and the steering knuckle (6) is connected with the steering engine assembly (4) arranged in the frame (13) through the steering swing arm (63);

the outer connecting device (2) comprises an upper swing arm (7) and a lower swing arm (8) which are arranged in parallel up and down, wherein the upper swing arm (7) and the lower swing arm (8) are of U-shaped structures, an upper left front arm leg (71) and an upper left rear arm leg (72) of the upper swing arm (7) are connected with a frame (13), an upper right arm leg (73) of the upper swing arm (7) is connected with the top end of a side support arm (53) through an eccentric pin (9), the joint of an upper proximal support arm (53) and a bottom support arm (52) at the bottom end of the side support arm (53) is connected with a lower arm seat (86) arranged on a lower right arm leg (83) of the lower swing arm (8), a lower left front arm leg (81) and a lower left rear arm leg (82) of the lower swing arm (8) are connected with the frame (13), the bottom end of the longitudinal elastic element (1) is contacted with the inner bottom surface of a bottom support plate (55), and the top end of the longitudinal elastic element (1) is connected with the top plate (31) through a gap between the upper left front arm leg (71) and the upper left rear arm (72) from bottom to top;

the upper left forearm leg (71), the upper left rear arm leg (72), the lower left forearm leg (81) and the lower left rear arm leg (82) are internally and penetratingly embedded with a first rubber bushing (74), a second rubber bushing (75), a third rubber bushing (84) and a fourth rubber bushing (85) which are in one-to-one correspondence;

the axial lines of the first rubber bush (74) and the second rubber bush (75) are coaxial, and the axial lines of the third rubber bush (84) and the fourth rubber bush (85) are coaxial.

2. A knuckle connection system according to claim 1, characterized in that: the inner bottom surface of the top tray (31) is connected with an upper limit rubber (33) through an upper limit block (32), the inner bottom surface of the bottom tray (55) is connected with a lower limit rubber (35) through a lower limit block (34), the top end and the bottom end of the longitudinal elastic element (1) are respectively sleeved outside the upper limit block (32) and the lower limit block (34), the upper limit block (32) and the upper limit rubber (33) are vulcanized into a whole, and the lower limit block (34) and the lower limit rubber (35) are vulcanized into a whole.

3. A knuckle connection system according to claim 2, characterized in that: the parts of the inner bottom surfaces of the top tray (31) and the bottom tray (55) which are contacted with the longitudinal elastic element (1) are respectively provided with an upper rubber pad (11) and a lower rubber pad (12).

4. A knuckle connection system according to claim 1, 2 or 3, characterized in that: the distance between the axes of the revolute pairs of the upper swing arm (7) is smaller than or equal to the distance between the axes of the revolute pairs of the lower swing arm (8), and an upper counter bore groove (77) and a lower counter bore groove (87) are respectively formed in the upper swing arm (7) and the lower swing arm (8).

5. A knuckle connection system according to claim 1, 2 or 3, characterized in that: the eccentric pin (9) comprises a front locking disc (91), a pin body structure (92), a pin cover body (93) and a rear locking disc (94), the pin body structure (92) comprises a locking cap (921), a pin seat (922), a front pin shaft (923), a middle pin shaft (924) and a rear pin shaft (925) which are sequentially connected, the inner parts of the locking cap (921), the pin seat (922), the front pin shaft (923) and the middle pin shaft (924) are provided with the same grease nozzle mounting cavity (926), the middle pin shaft (924) is provided with a lubrication oil hole (927) communicated with the grease nozzle mounting cavity (926), the end face of the rear pin shaft (925) is provided with a pin shaft connecting hole (928), the pin cover body (93) comprises a locking cover (931) and a pin cover seat (932) which are sequentially connected, the locking cover through hole (933) is formed in the locking cover seat (931), and a through pin shaft inserting hole (934) is formed in the pin cover seat (932) so as to be in inserted and matched with the rear pin shaft (925).

6. A knuckle connection system according to claim 5, characterized in that: front connecting holes (911) connected with the upper right arm feet (73) are formed in the tray wall of the front locking tray (91), front locking holes (912) matched with locking caps (921) in a locking mode are formed in the front locking tray (91), rear connecting holes (941) connected with the upper right arm feet (73) are formed in the tray wall of the rear locking tray (94), rear locking holes (942) matched with locking caps (931) in a locking mode are formed in the rear locking tray (94), pin shaft connecting holes (928) are connected with one ends of fixing bolts (95), and the other ends of the fixing bolts (95) penetrate through cover through holes (933) and are fixedly connected with the outer walls of the locking caps (931).