CN204186860U - Hinging system for hinged chassis - Google Patents

Abstract

The utility model discloses an articulated vehicle chassis hinge system, which comprises a front frame, a rear frame, a turntable bearing, and left and right buffers arranged on both sides of the turntable bearing, and the hydraulic control oil circuit on each buffer is set as follows: When the rod chamber of the hydraulic cylinder is compressed, the hydraulic oil in the rod chamber returns to the oil storage tank through the damped oil circuit, and the hydraulic oil in the oil storage tank is sucked into the rodless chamber through the non-damped oil circuit; when the hydraulic cylinder When the rodless chamber is compressed, the oil passage from the rodless chamber back into the oil storage tank and the oil passage from the oil storage tank into the rod chamber are both non-damping oil passages; the buffer designed in this way makes one of the buffers when the vehicle turns The piston rod of the hydraulic cylinder of the buffer is stretched to provide a set damping buffer force for the buffer selection; the piston rod of the other buffer is compressed to provide a small buffer force, making the vehicle turn more stable and safe. When turning, a small damping torque is generated on the buffer, making the turning faster and easier.

Description

Articulated vehicle chassis articulation system

technical field

The utility model relates to the technical field of vehicle chassis hinges, in particular to a hinged vehicle chassis hinge system with a double-cylinder single damping buffer device.

Background technique

With the rapid development of my country's automobile manufacturing industry, various vehicle manufacturing industries are also advancing by leaps and bounds. Articulated buses are gradually popularized in large and medium-sized cities in China due to their large passenger capacity and high utilization coefficient. An articulated bus is generally composed of front and rear carriages and a chassis articulation system connecting the front and rear carriages. The chassis articulation system includes a front frame, a rear frame, a turntable bearing, and a hydraulic buffer device. The frame is fixedly connected with the rear compartment of the articulated vehicle through the rear beam.

Among them, the hydraulic buffer device in the chassis articulated system is the key factor restricting the performance of articulated vehicles. The hydraulic buffer device of an articulated bus generally consists of two left and right hydraulic cylinders, a liquid storage tank and an electrical control system, such as the hydraulic buffer system disclosed by the applicant in the Chinese patent application number 201010141173.7, named hydraulic buffer system. Including a hydraulic cylinder 12 and a liquid storage tank 13, as shown in FIG. The first oil suction circuit where the check valve 141 is located, the first oil discharge circuit where the second check valve 142 and the hydraulic damping hole 151 are formed, the hydraulic circuit between the rod cavity 121 and the liquid storage tank 13 includes a third The second oil discharge circuit composed of check valve 16, hydraulic damping hole 152, first solenoid valve 17, and the second oil suction circuit composed of fourth check valve 18 and second solenoid valve 19, the hydraulic system is set by setting The unique hydraulic damping hole provides buffer damping proportional to the turning speed when the vehicle is turning, and has the functions of over-angle locking and straight-ahead recovery.

However, during the turning process of the vehicle, as the turning angle becomes larger, the buffer damping required by the system is different. Under the action of the hole, a certain damping is provided, which slows down the turning speed of the vehicle. If the hydraulic damping hole is blocked by hydraulic oil, the possibility of cylinder explosion will occur.

Utility model content

The purpose of this utility model is to overcome the defects of the prior art, and provide a chassis articulation system of an articulated vehicle, which adopts a double-cylinder single-damping buffer device to provide more accurate hydraulic buffer damping control for the vehicle turning process, so that the articulation system The sports performance is more stable, and at the same time, the process of returning the vehicle from a turning state to going straight is faster and safer.

In order to achieve the above purpose, the utility model proposes the following technical proposal: the articulated vehicle chassis articulated system includes a front frame, a rear frame, a turntable bearing and a hydraulic buffer device connected between the front frame and the rear frame, and the hydraulic buffer device includes a hydraulic Cylinder, oil storage tank, and a hydraulic control oil circuit formed between the hydraulic cylinder and the oil storage tank, the hydraulic cylinder is provided with a piston and a piston rod, and the piston divides the hydraulic cylinder into a rod cavity and a rodless cavity; the hydraulic control The oil circuit includes the first oil suction circuit and the first oil return circuit arranged between the rodless cavity of the hydraulic cylinder and the oil storage tank, and the second oil suction circuit and the second return circuit arranged between the rod cavity of the hydraulic cylinder and the oil storage tank. Oil circuit: When the hydraulic oil passes through the first oil suction circuit, the first oil return circuit and the second oil suction circuit, there is basically no damping between the hydraulic cylinder and the oil storage tank, and when the hydraulic oil passes through the second oil return circuit Different damping is produced according to the pressure on the oil circuit.

As a preferred solution, the hydraulic buffer device includes a left buffer and a right buffer arranged on both sides of the turntable bearing, and when the articulated vehicle turns, the hydraulic cylinder piston rod of one of the left buffer and the right buffer It is stretched to provide the damping force of the set damping for the buffer; the piston rod of the other buffer hydraulic cylinder is compressed to provide a small buffering force for the buffer.

As a preferred solution, when the articulated vehicle turns left or right to reach a certain angle, the axis of the buffer on the corresponding side passes through the rotation center of the turntable bearing, and the piston rod of the side buffer is retracted to the shortest position; when the articulated vehicle continues to turn beyond When the above angle is reached, the piston rod of the side buffer will change from retraction to extension.

As a preferred solution, the different damping includes basic damping, enhanced damping and safety lock damping selected according to the degree of compression of the rod cavity.

As a preferred solution, when the articulated vehicle turns left and right at the same angle value, the damping moments generated by the hydraulic buffer device are mirror images of each other.

As a preferred solution, a first one-way valve is provided on the first oil suction circuit, a second one-way valve is provided on the first oil return circuit, and a fourth one-way valve is provided on the second oil suction circuit.

As a preferred solution, a third one-way valve, a mechanical valve, a solenoid valve, a hydraulic damping hole and a first overflow valve are arranged on the second oil return oil circuit, and the solenoid valve is connected to the hydraulic damping hole and connected to the hydraulic damping hole. The first overflow valve is connected in parallel, the electromagnetic valve connected in parallel is connected with the first overflow valve, the mechanical valve and the third one-way valve, and the electromagnetic valve is connected with the hydraulic damping hole to form a foundation The damping oil passage is used to generate basic damping; the first overflow valve connected in parallel forms an enhanced damping oil passage, which is used to generate enhanced damping greater than the basic damping.

As a preferred solution, the second oil return oil circuit is also connected in parallel with a safety lock oil circuit, and a second overflow valve connected to the third one-way valve is arranged on the safety lock oil circuit to provide Greater safety lock-up damping than said enhanced damping.

As a preferred solution, the oil storage tank is arranged on the periphery of the hydraulic cylinder, and the two ends of the oil storage tank and the hydraulic cylinder are respectively fixedly connected to the integrated block and the end cover; the hydraulic cylinder and the oil storage tank are connected to the rear end cover through the The frame is connected, and the piston and the piston rod are connected with the front frame.

As a preferred solution, the hydraulic buffer device is provided with a mechanical valve, the mechanical valve has a mechanical valve spool extending in the rod chamber of the hydraulic cylinder, and the mechanical valve spool blocks the mechanical valve under the push of the piston. The oil road where it is located.

The utility model utilizes the articulated system, when the turning angle of the articulated vehicle reaches the first angle (38.6° in the embodiment is preferred), the central axis of the hydraulic cylinder of the left buffer or the right buffer will pass through the rotation center of the turntable bearing. When the articulated vehicle continues to turn beyond the angle, the piston rod of the side buffer will will change from indented to extended.

When the turning angle of the articulated vehicle exceeds the first angle, the articulated system needs a larger damping moment. Taking advantage of the characteristic that the left and right buffers are all piston rods, the hydraulic control principle of the buffer is designed, and a mirror image of each other is obtained. Damping torque curve; when the vehicle needs to turn around after turning, the buffer system only provides a relatively low damping moment, so that the vehicle can turn quickly and lightly; when the vehicle's electronic control system fails, the double-cylinder single-damping hydraulic buffer system is powered off , to provide enhanced damping and safety locking damping functions for the hinge system to ensure that the vehicle can safely drive to the repair shop, and provide high damping force for the vehicle in the event of an abnormal power failure, so that the vehicle can keep its original shape as much as possible to ensure safety.

Compared with the prior art, the utility model has lower cost, more stable movement performance of the hinge system, and higher safety performance.

Description of drawings

Fig. 1 is a schematic diagram of the hinged system of the chassis of the articulated vehicle of the present invention;

Fig. 2 is the hydraulic principle diagram of the buffer in the articulated vehicle chassis articulated system of the utility model;

Fig. 3 is a structural schematic diagram of the buffer in the hinged system of the chassis of the articulated vehicle of the present invention;

Fig. 4 is a three-dimensional schematic diagram of the integrated block in the buffer of the present invention;

Fig. 5 is a schematic cross-sectional view of a mechanical valve installed in a manifold;

Fig. 6 is a hydraulic schematic diagram of the chassis hinge system of the utility model articulated vehicle;

Fig. 7 is a schematic diagram of the positional relationship between the turntable bearing and the hydraulic buffer device of the present invention when the vehicle is going straight;

Fig. 8 is a schematic diagram of the positional relationship between the turntable bearing and the hydraulic buffer device of the present invention when the vehicle turns right by 38.6°;

Fig. 9 is a schematic diagram of the second embodiment of the buffer of the articulation system of the articulated vehicle of the present invention;

Fig. 10 is a schematic diagram of the third embodiment of the buffer of the articulation system of the articulated vehicle of the present invention;

Fig. 11 is a schematic hydraulic diagram of the articulated vehicle articulation system in the background art.

reference sign

1 Front frame 2 Rear frame

3 Slewing bearing 4 Electronic control unit

5 left buffer 6 right buffer

51 Hydraulic cylinder 511 Rodless cavity

512 Rod cavity 52 Oil storage tank

53 Manifold 54 End cover

55 Piston 56 Piston Rod

57 Outer tube 58 Set screw

59 Oil inlet port 91 The first one-way valve

92 Second check valve 93 Third check valve

94 The fourth one-way valve 95 Mechanical valve

951 Mechanical Valve Spool 952 Spring

953 Spring sleeve 954 Circulation section

955 Blocking section 21, 23, 96 Solenoid valve

98 First relief valve 22, 24, 97 Hydraulic orifice

99 Second relief valve

Detailed ways

The technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the utility model.

As shown in Figure 1, the articulated vehicle chassis articulated system disclosed by the utility model is used to connect the front and rear compartments of an articulated bus (not shown), which includes a front frame 1, a rear frame 2, a turntable bearing 3, a hydraulic buffer device and Electronic control system4. The front frame 1 is connected to the front compartment, and the rear frame 2 is connected to the rear compartment, and the front and rear compartments realize the turning of the vehicle through the rotation of the turntable bearing 3; the hydraulic buffer device includes a left buffer 5 and a right buffer 6 arranged on both sides of the turntable bearing 3 , the two ends of the left buffer 5 and the right buffer 6 are respectively connected to the front frame 1 and the rear frame 2 for providing buffer damping when the vehicle turns.

Fig. 2 shows the hydraulic schematic diagram of the left buffer 5 and the right buffer 6, the structures of the left buffer 5 and the right buffer 6 are the same, taking the left buffer 5 as an example, it includes a hydraulic cylinder 51, an oil storage tank 52, an integrated block 53, an end cover 54, and a hydraulic control oil circuit arranged between the hydraulic cylinder 51 and the oil storage tank 52. The oil storage tank 52 is arranged on the periphery of the hydraulic cylinder 51 , the integrated block 53 is fixedly installed on one end of the hydraulic cylinder 51 and the oil storage tank 52 , and the end cover 54 is installed on the other end of the hydraulic cylinder 51 and the oil storage tank 52 . The hydraulic cylinder 51 is provided with a piston 55 connected with a piston rod 56 , and the piston 55 divides the hydraulic cylinder 51 into a rodless chamber 511 and a rod chamber 512 . Specifically, after the hydraulic cylinder 51, the oil storage tank 52 and the integrated block 53 are fixedly connected, they are connected to the rear frame 2 of the hinge system; the piston 55 and the piston rod 56 are connected to the front frame 1 of the hinge system, thereby The left buffer 5 and the right buffer 6 generate buffer damping on the hydraulic control oil circuit through the extension and retraction of the piston rod 56 when the vehicle turns, thereby providing buffer force for the vehicle to turn.

As shown in FIG. 3 , the integrated block 53 is arranged at one end of the hydraulic cylinder 51 and the oil storage tank 52 , and the ends are sealed by a seal (not shown). An outer tube 57 is arranged around the cylinder barrel of the hydraulic cylinder 51 , and the oil storage tank 52 is an annular sealing area formed between the outer tube 57 and the cylinder barrel of the hydraulic cylinder 51 . The integrated block 53 and the outer tube 57 are welded together by flanges, and the end cover 54 is arranged on the cylinder barrel of the hydraulic cylinder 51 and the other end of the outer tube 57 , and is also sealed at the end by a seal. More preferably, the integrated block 53 is also provided with a flat-end set screw 58 to press against the cylinder, so as to prevent the axial movement of the cylinder between the integrated block 53 and the end cover 54 .

The hydraulic control oil circuit is arranged between the hydraulic cylinder 51 and the oil storage tank 52, including a first oil suction circuit, a first oil return circuit, a second oil suction circuit and a second oil return circuit. The oil suction circuit is arranged between the oil storage tank 52 and the rodless cavity 511 of the hydraulic cylinder 51, and the first check valve 91 is arranged on the oil circuit, and the first check valve 91 is stretched outward by the piston rod 56, that is, there is no The rod chamber 511 is opened when the oil pressure decreases, so that the hydraulic oil is sucked from the oil storage tank 52 into the rodless chamber 511 of the hydraulic cylinder 51; the first oil return circuit is arranged between the rodless chamber 511 of the hydraulic cylinder 51 and the oil storage tank 52 A second one-way valve 92 is arranged on the oil circuit, and the second one-way valve 92 is opened when the piston rod 56 is compressed inwardly, that is, the oil pressure in the rodless chamber 511 of the hydraulic cylinder 51 increases, so that the hydraulic oil flows from the hydraulic cylinder 51 The rodless cavity 511 discharges to the oil storage tank 52; the second oil suction oil circuit is arranged between the oil storage tank 52 and the rod cavity 512 of the hydraulic cylinder 51, and the fourth check valve 94 is arranged on the oil circuit, and the fourth check valve 94 When the oil pressure in the rod cavity of the hydraulic cylinder 51 decreases, the hydraulic oil is sucked into the rod cavity 512 from the oil storage tank 52; the second oil return circuit is arranged between the rod cavity 512 of the hydraulic cylinder 51 and the oil storage tank 52, A third one-way valve 93 and a damping oil circuit are arranged on the oil circuit, wherein the third one-way valve 93 opens when the oil pressure in the rod chamber 512 increases.

The damping oil circuit includes a parallel-connected damping control oil circuit and a safety lock oil circuit, and the damping control oil circuit is provided with a mechanical valve 95, a solenoid valve 96, a hydraulic damping hole 97 and a first overflow valve 98, wherein the After the electromagnetic valve 96 is connected with the hydraulic damping hole 97 to form the basic damping oil circuit, it is connected in parallel with the first overflow valve 98 on the enhanced damping oil circuit. 97 and the first overflow valve 98 are connected. The safety lock oil circuit is provided with a second overflow valve 99. After the safety lock oil circuit and the damping control oil circuit are connected in parallel, one end is connected to the third one-way valve 93, and the other end is connected to the oil storage tank 52. superior. Among them, the basic damping oil circuit formed by the solenoid valve 96 connected in series with the hydraulic damping hole 97 provides the buffer force of basic damping for the buffer; the enhanced damping oil circuit where the first overflow valve 98 is located provides the buffer with enhanced damping force .

More preferably, the first relief valve 98 and the second relief valve 99 are respectively preset with a hydraulic opening pressure, and the hydraulic opening pressure of the first relief valve 98 is higher than the hydraulic pressure generated by the hydraulic damping hole 97 at normal operating speed. pressure, the hydraulic opening pressure of the second relief valve 99 is higher than the hydraulic opening pressure of the first relief valve 98, so that the hydraulic damping produced on the enhanced damping oil circuit is greater than the hydraulic damping produced on the basic damping oil circuit, and the safety lock The hydraulic damping produced on the stop oil road is greater than the hydraulic damp produced on the enhanced damping oil road.

Furthermore, the first oil suction passage and the first oil return passage are arranged on the end cover 54 , and the second oil suction passage and the second oil return passage are arranged on the integrated block 53 .

When the piston rod 56 of the hydraulic cylinder 51 protrudes toward one end of the rod cavity 512, the volume of the rod cavity 512 decreases, and the compressed hydraulic oil flows into the oil storage tank 52 through the second oil return circuit, and when the electromagnetic When the valve 96 is in the energized state, the basic damping oil circuit is connected, and the hydraulic damping hole 97 sets the buffering damping pressure for the buffer. At this time, the buffering damping force of the buffer is proportional to the hydraulic oil flow through the hydraulic damping hole, that is, it is proportional to the flow rate of the piston. The linear velocity at which the rod 56 is extended is proportional.

When the linear velocity of the piston rod 56 is large enough and the pressure generated by the hydraulic damping hole 97 reaches the preset pressure value of the first relief valve 98, the first relief valve 98 starts to release pressure and maintain the pressure in the oil circuit. The pressure value set by the first overflow valve 98 is basically constant until the linear velocity of the piston rod 56 is reduced, the hydraulic oil flow through the hydraulic damping hole 97 is reduced, and the resulting pressure value is lower than that of the first overflow valve 98. The set pressure value; when the solenoid valve 96 is in the power-off state and the basic damping oil circuit is closed, at this time, the first relief valve 98 sets the buffer damping pressure for the buffer, and the damping pressure is basically constant as the first relief valve 98 The set opening pressure; when the piston rod 56 continues to extend, the piston gradually compresses the handle of the mechanical valve 95 installed on the manifold 53, so that the channel of the damping control oil circuit gradually decreases until it is closed, at this time the second overflow The flow valve 99 sets the buffer damping pressure for the buffer, and the buffer is in a safety lock state;

As shown in Figures 4 and 5, the mechanical valve 95 is installed in the mechanical valve installation hole (not shown) on the manifold 53, and the installation hole is provided with an oil inlet 59 for the damping control oil circuit. The mechanical valve 95 has a mechanical valve spool 951 , a spring 952 and a spring sleeve 953 pushed by the mechanical valve spool 951 . The mechanical spool 951 has a flow section 954 with a smaller diameter and a blocking section 955 with a larger diameter. The mechanical valve 95 is installed in the installation hole, and the outer end of the valve core extends in the rod cavity 512 of the hydraulic cylinder 51 outside the manifold 53 . Under normal working conditions, the oil inlet 59 on the mounting hole is located at the position of the circulation section 954 of the mechanical valve core, and the hydraulic oil circulates through the oil inlet 59; when the mechanical valve core is pushed by the piston stretched outward, The spool of the mechanical valve 95 compresses the spring and moves to the inside of the mounting hole. When the spool blocking section 955 reaches the position where the oil inlet 59 is located, the damping control The oil inlet 59 of the oil circuit is blocked, and the mechanical valve 95 is closed. In other words, according to the setting of the oil circuit on the manifold block, the spool blocking section 955 blocks the common oil inlet circuit of the basic damping oil circuit and the enhanced damping oil circuit, while Do not block the oil inlet of the safety lock-up oil passage and the oil inlet of the second oil suction oil passage.

When the piston rod 56 of the hydraulic cylinder 51 protrudes toward one end of the rod cavity 512, the volume of the rodless cavity 511 increases, negative pressure is generated in the cavity, and the first one-way valve 91 is opened, so that the hydraulic oil Oil is sucked from the oil storage tank 52 through the first oil suction oil path, and the damping on this oil path can be ignored, forming an undamped oil path.

When the piston rod 56 of the hydraulic cylinder 51 retracts toward one end of the rodless cavity 511, the volume of the rod cavity 512 increases, negative pressure is generated in the cavity, the fourth one-way valve 94 is opened, and the hydraulic oil passes through The second oil suction circuit sucks the rod cavity 512 of the hydraulic cylinder 51 from the oil storage tank 52; for the rodless cavity 511, its volume decreases, the oil pressure in the container increases, the second check valve 92 opens, and the hydraulic oil passes through The first oil return oil path is discharged from the rodless cavity 511 to the oil storage tank 52. At this time, the damping buffer force on this oil path is also almost negligible, and it is also formed as a non-damping oil path.

Referring further to Fig. 6, after the left and right buffers 5, 6, which are mirror images of each other, are connected with the articulation system and controlled by the electronic control unit 4, a hydraulic buffer system with double cylinders and single damping is formed (because the left and right buffers 5 The structure of , 6 is the same as the hydraulic circuit, so the identification of the corresponding components of the right buffer 6 is omitted among the figures), and the electronic control unit 4 is the same as that of the prior art, including the vehicle CAN communication system and the proximity switch ( Not shown in the figure), after the vehicle starts, the solenoid valves 96 of the left and right buffers 5 and 6 are energized; Figure 7 shows the positional relationship of the articulation system when the vehicle is going straight. At this time, the left buffer 5 and the right buffer 6 are symmetrical Distributed on the left and right sides of the hinged bearing 3. When the vehicle turns right to the first angle (38.6° in this embodiment), the positional relationship between the hydraulic buffer system and the articulation system is as shown in Figure 8. At this moment, the axis of the right buffer 6 passes through the center of rotation of the turntable bearing 3, and the right buffer The piston rod 56 of the device 6 is retracted to the shortest position; if the vehicle continues to turn right, the piston rod 56 will be stretched out from the retraction, and the left buffer 5 will continue to stretch out, that is, when the vehicle turning angle is greater than the first angle, The piston rods 56 of the left and right buffers 5, 6 are all in the extended state; and when the vehicle turns right in a turning range greater than the first angle, the piston rods 56 of the left and right buffers 5, 6 are all in the extended state.

When the vehicle is going straight and turning right between the first angle, the piston rod 56 of the left buffer 5 of the articulation system stretches out to provide basic damping buffer moment; It can be seen from the working process that the buffer torque provided by the right buffer 6 can be ignored at this moment; The piston rod 56 of the buffer 5 stretches out to provide the basic damping buffer moment for the hinge system, and the piston rod 56 of the right buffer 6 stretches out to obtain a damping moment arm as the vehicle turns right to provide the basic damping buffer force for the hinge system.

When the vehicle continues to turn right between the second angle and the third angle (the third angle is 51° in this embodiment), the proximity switch in the electronic control unit 4 is triggered to send control to the vehicle electronic control through the CAN communication system signal, the electronic control unit 4 controls the solenoid valves 96 of the left and right buffers 5 and 6, so that the solenoid valves 96 are de-energized, and the left and right buffer solenoid valves 96 are closed. moment.

When the vehicle turns right between the third angle and the fourth angle (the fourth angle in this embodiment is 54°), the proximity switch in the electronic control unit 4 is triggered to send a signal to the vehicle electronic control through the CAN communication system , the electronic control unit 4 controls the solenoid valves 96 of the left and right buffers 5 and 6, so that the solenoid valve 96 is powered off, and at the same time the piston rod 56 of the left buffer 5 is stretched outward to touch the handle of the mechanical valve 95, blocking the position of the mechanical valve 95 The oil circuit provides the buffer torque of safety locking damping for the articulation system, and the right buffer 6 provides enhanced damping torque for the articulation system.

When the vehicle turns straight or turns left from the beginning of the right turn to the fourth angle, the front and rear frames 1 and 2 of the articulated system need to turn around, and the left buffer 5 of the double-cylinder single damping effect is due to the piston rod 56 Inwardly compressed, the damping generated by it is negligible, and the damping torque provided by the left buffer 5 becomes the damping torque provided by the right buffer 6 in the articulation system. At this time, the moment arm of the left buffer 5 is greater than that of the right buffer 6 , the damping of the right buffer 6 is the basic damping. From the calculation formula that the torque is equal to the force multiplied by the moment arm, it can be concluded that as the hinged system rotates, the damping torque provided by the hydraulic buffer system for the hinged system becomes smaller, so that the hinged system can Can be swiveled easily. Moreover, the larger the turning angle, the greater the damping torque that prevents the turning angle from becoming larger, and the smaller the damping torque provided when turning, so that the vehicle can quickly turn back to the normal driving state, avoiding the side slip caused by the excessive damping torque caused by turning , Improve the safety of driving.

When the vehicle electronic control system 4 breaks down, the solenoid valves 96 in the left and right buffers 5 and 6 will be powered off, and the left and right buffers 5 and 6 will provide enhanced damping and safety locking damping functions for the articulation system to ensure that the vehicle travels safely until it is repaired Factory, and in the case of abnormal power failure, provide high damping force for the vehicle, so that the vehicle can keep its original shape as much as possible to ensure safety.

The rotation of the articulated system is the same. When the vehicle turns left, the double-cylinder single-damping hydraulic buffer system provides substantially equal damping torque for the articulated system at the same angle, but the functions of the left and right buffers 5 and 6 are reversed. In this way, for the articulated system, when turning left and right, the buffer moment curves that are mirror images of each other are obtained.

In other embodiments of the present utility model, the damping control oil circuit on the second oil return oil circuit between the hydraulic cylinder 51 and the oil storage tank 52 can be changed according to the requirements of vehicle control accuracy, as shown in Fig. The damping control oil circuit of the valve 21 and the hydraulic damping hole 22, or the damping control oil circuit including the solenoid valve 23 and the hydraulic damping hole 24 in series in FIG. turn process.

The technical content and technical features of the utility model have been disclosed above, but those skilled in the art may still make various replacements and modifications based on the teaching and disclosure of the utility model without departing from the spirit of the utility model. Therefore, the protection of the utility model The scope should not be limited to the content disclosed in the embodiments, but should include various replacements and modifications that do not depart from the utility model, and are covered by the claims of this patent application.

Claims (10)

1. An articulated vehicle chassis hinge system, including a front frame, a rear frame, and a turntable bearing and a hydraulic buffer device connected between the front frame and the rear frame. The hydraulic buffer device includes a hydraulic cylinder and an oil storage tank, and is formed on the hydraulic cylinder and The hydraulic control oil circuit between the oil storage tanks, the hydraulic cylinder is provided with a piston and a piston rod, and the piston divides the hydraulic cylinder into a rod chamber and a rodless chamber; it is characterized in that the hydraulic control oil circuit includes a The first oil suction oil circuit and the first oil return oil circuit between the rodless chamber and the oil storage tank, and the second oil suction oil circuit and the second oil return oil circuit arranged between the rod chamber of the hydraulic cylinder and the oil storage tank; the hydraulic oil passes through There is basically no damping between the hydraulic cylinder and the oil storage tank when the first oil suction circuit, the first oil return circuit and the second oil suction circuit are produced. When the hydraulic oil passes through the second oil return circuit, the pressure on the oil circuit is different. produce different damping. 2. The chassis articulation system of an articulated vehicle according to claim 1, wherein the hydraulic buffer device comprises a left buffer and a right buffer arranged on both sides of the turntable bearing, and when the articulated vehicle turns, the The piston rod of the hydraulic cylinder of one of the left buffer and the right buffer is stretched to provide the buffer with the set damping force; the piston rod of the other buffer hydraulic cylinder is compressed to provide the buffer with a small force. buffer force. 3. The chassis articulation system of an articulated vehicle according to claim 2, wherein when the articulated vehicle turns left or right to a certain angle, the axis of the corresponding side buffer passes through the rotation center of the turntable bearing, and the side buffer The piston rod of the side buffer is retracted to the shortest position; when the articulated vehicle continues to turn beyond the stated angle, the piston rod of the side buffer will be extended from retraction. 4. The articulated vehicle chassis articulation system according to claim 1 or 2, characterized in that the different damping includes basic damping, enhanced damping and safety lock damping selected according to the degree of compression of the rod cavity. 5. The chassis articulation system of an articulated vehicle according to claim 1, wherein when the articulated vehicle turns left and turns right at the same angle, the damping moments generated by the hydraulic buffer device are mirror images of each other. 6. The articulated vehicle chassis articulation system according to claim 1, characterized in that a first check valve is arranged on the first oil suction oil circuit, and a second one-way valve is arranged on the first oil return oil circuit, A fourth one-way valve is arranged on the second oil suction oil circuit. 7. The articulated vehicle chassis articulated system according to claim 1, characterized in that a third check valve, a mechanical valve, a solenoid valve, a hydraulic damping hole and a first overflow valve are arranged on the second oil return oil circuit , the solenoid valve is connected in parallel with the first relief valve after being connected with the hydraulic damping hole, and the solenoid valve connected in parallel is connected with the first relief valve and then with the mechanical valve and the third one-way valve , the electromagnetic valve is connected with the hydraulic damping hole to form a basic damping oil circuit, which is used to generate basic damping; the first overflow valve in parallel forms an enhanced damping oil circuit, which is used to generate enhanced damping. 8. The chassis articulation system of articulated vehicles according to claim 7, characterized in that a safety lock oil circuit is connected in parallel on the second oil return oil circuit, and a safety lock oil circuit is provided on the safety lock oil circuit which is connected to the first oil return oil circuit. The second relief valve connected by the three check valves is used to provide greater safety lock-up damping than the enhanced damping. 9. The articulated vehicle chassis hinge system according to claim 1, wherein the oil storage tank is arranged on the periphery of the hydraulic cylinder, and the two ends of the oil storage tank and the hydraulic cylinder are respectively fixedly connected to the integrated block and the end cover; The hydraulic cylinder and the oil storage tank are connected to the rear frame through the end cover, and the piston and piston rod are connected to the front frame. 10. The articulated vehicle chassis articulated system according to claim 1, characterized in that, the hydraulic buffer device is provided with a mechanical valve, and the mechanical valve has a mechanical valve spool extending in the rod chamber of the hydraulic cylinder, so that The mechanical valve spool blocks the oil circuit where the mechanical valve is located under the push of the piston.