Frame system capable of switching connection mode between frame and front axle and switching method thereof

Abstract

The present invention discloses a frame system with switchable connection modes between a frame and a front axle, including a frame, wherein the lower part of the front end of the frame is connected to the front axle via a leaf spring; the frame comprises two longitudinal beams arranged in parallel, and a group of switching components are respectively arranged at the left and right front ends of the two longitudinal beams, and the switching components are used to switch the connection mode between the frame and the front axle between an elastic connection and a rigid connection. The present invention also discloses a method for switching the connection mode between the frame and the front axle. The frame of the present invention has two connection modes, namely a rigid connection and an elastic connection, and the elastic connection is used when the industrial vehicle is traveling at high speed, and has a good vibration reduction function. The industrial vehicle switches to a rigid connection when it reaches the working area, and the industrial vehicle has good impact resistance. The frame system with switchable connection modes between the frame and the front axle of the present invention saves an additional transport vehicle for transporting engineering vehicles, and saves costs.

Description

Technical Field

[0001] The invention relates to the field of special industrial vehicles, and in particular to a frame system capable of switching the connection mode between a frame and a front axle and a switching method thereof. Background Art

[0002] Industrial vehicles are in a low-speed driving state when operating. The frame bears a large load, and most of them are impact loads. The frame and the axle are directly rigidly connected, without a vibration reduction system, and the vehicle itself has a low self-driving speed, generally not exceeding 40km / h. However, for some emergency tasks, when loading and unloading materials in two places over a long distance, simply relying on low-platform transportation of industrial vehicles will invisibly increase additional equipment and deployment and withdrawal time, which is not conducive to the completion of emergency tasks. If the self-driving speed of the industrial vehicle itself is increased to a highway driving speed of more than 80km / h, without relying on low-platform transportation, the industrial vehicle can meet the emergency task requirements of loading and unloading materials in two places over a long distance. In order to ensure the comfort and driving smoothness of industrial vehicles when driving at high speed, the frame and the axle should be connected in an elastic manner with good vibration reduction function. In this case, the industrial vehicle must meet the requirements of low-speed operation and must have the ability to drive at high speed on the highway. Therefore, it is required that the connection between the frame and the axle of the industrial vehicle should have both rigid and elastic connection methods, and ensure that the two connection methods can be converted quickly, safely and reliably. Summary of the invention

[0003] In order to solve the above technical problems, the main purpose of the present invention is to provide a frame system and a switching method thereof that can switch the connection mode between the frame and the front axle. When the frame and the front axle are in an elastic connection state, the industrial vehicle has good comfort and driving smoothness when traveling at high speed. When the frame and the front axle are in a rigid connection, the industrial vehicle can travel at a low speed and has good impact resistance.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions.

[0005] (i) A frame system capable of switching the connection mode between the frame and the front axle, comprising a frame, wherein the lower portion of the front end of the frame is connected to the front axle via a leaf spring; the frame comprises two longitudinal beams arranged in parallel, and a group of switching components are respectively arranged at the left and right front ends of the two longitudinal beams, and the switching components are used to switch the connection mode between the frame and the front axle between an elastic connection and a rigid connection.

[0006] Furthermore, each switching assembly includes a switching cylinder, a horizontal crank arm, a push-pull rod, a vertical upper plate and a vertical lower plate; the horizontal part of the switching cylinder is hinged on the longitudinal beam, the middle part of the horizontal crank arm is hinged on the longitudinal beam, and the switching cylinder is located behind the horizontal crank arm; the upper end of the vertical upper plate is hinged on the longitudinal beam, the lower end of the vertical lower plate is hinged on the front axle, and the lower end of the vertical upper plate and the upper end of the vertical lower plate are hinged through a first hinge shaft; one end of the horizontal crank arm is hinged to the piston rod of the switching cylinder, and the other end of the horizontal crank arm is connected to the tail end of the push-pull rod, and the front end of the push-pull rod is hinged on the first hinge shaft; when the vertical upper plate and the vertical lower plate are collinear in the vertical direction, the frame and the front axle are rigidly connected; when the vertical upper plate and the vertical lower plate are not collinear in the vertical direction, the frame and the front axle are elastically connected.

[0007] Furthermore, an oil cylinder support is provided on the inner side of the longitudinal beam, and a crank arm support is provided on the outer side of the longitudinal beam; the switching oil cylinder is hinged on the oil cylinder support, and the horizontal crank arm member is hinged on the crank arm support.

[0008] Furthermore, a shock absorber is arranged between the leaf spring and the longitudinal beam.

[0009] Furthermore, the horizontal crank arm member includes a driving arm and a driven arm, and the angle between the driving arm and the driven arm is 150°.

[0010] Furthermore, the length of the vertical lower plate is greater than the length of the vertical upper plate.

[0011] (II) A method for switching the connection mode between a vehicle frame and a front axle, based on the above vehicle frame system capable of switching the connection mode between the vehicle frame and the front axle, the switching method comprises the following steps:

[0012] Step 1: Start the vehicle hydraulic system, input hydraulic oil into the switching cylinder installed on each longitudinal beam, extend the piston rod of the switching cylinder, drive the horizontal crank arm to rotate, and the horizontal crank arm drives the push-pull rod to move backward, pulling the first articulated shaft to move backward;

[0013] Step 2: When the vertical upper plate and the vertical lower plate are collinear in the vertical direction, the oil circuit of the vehicle hydraulic system is locked, and the frame and the front axle are switched from an elastic connection to a rigid connection;

[0014] Step 3: Start the vehicle hydraulic system again, open the oil circuit of the vehicle hydraulic system, output the hydraulic oil in the switching cylinder, retract the piston rod of the switching cylinder, drive the horizontal crank arm to rotate, and the horizontal crank arm drives the push-pull rod to move forward, pushing the first articulated shaft to move forward;

[0015] Step 4: When the vertical upper plate and the vertical lower plate are not collinear in the vertical direction, the oil circuit of the vehicle hydraulic system is locked to complete the switching of the rigid connection between the frame and the front axle to the elastic connection.

[0016] Compared with the prior art, the technical solution of the present invention has two connection modes between the frame and the front axle: rigid connection and elastic connection. The elastic connection is used when the industrial vehicle is traveling at high speed, which has good vibration reduction function. The rigid connection is switched when the industrial vehicle reaches the working area, and the industrial vehicle has good impact resistance. The frame system of the present invention with switchable frame and front axle connection mode saves additional transport vehicles for transporting engineering vehicles and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 It is a three-dimensional schematic diagram of a frame system of the present invention that can switch the connection mode between the frame and the front axle and is applied to an engineering vehicle;

[0019] Figure 2 for Figure 1 A top view of the middle frame when rigidly connected to the front axle;

[0020] Figure 3 for Figure 2 The AA section view when the middle frame is rigidly connected to the front axle;

[0021] Figure 4 for Figure 1 A top view of the middle frame when it is elastically connected to the front axle;

[0022] Figure 5 for Figure 4 The directional view at the BB section when the middle frame is rigidly connected to the front axle;

[0023] Figure 6 A top view of an embodiment of a horizontal crank arm.

[0024] In the above picture:

[0025] 1 longitudinal beam; 2 leaf spring; 3 front axle; 4 switching cylinder; 5 horizontal crank arm member; 501 driving arm; 502 driven arm; 6 push-pull rod; 7 vertical upper plate; 8 vertical lower plate; 9 first articulated shaft; 10 cylinder support; 11 crank arm support; 12 shock absorber. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the following description, specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Industrial vehicles are in a low-speed driving state when operating. The frame bears a large load, and most of them are impact loads. The frame and the axle are directly rigidly connected, without a vibration reduction system, and the vehicle itself has a low self-driving speed, generally not exceeding 40km / h. However, for some emergency tasks, when loading and unloading materials in two places over a long distance, simply relying on low-platform transportation of industrial vehicles will invisibly increase additional equipment and deployment and withdrawal time, which is not conducive to the completion of emergency tasks. If the self-driving speed of the industrial vehicle itself is increased to a highway driving speed of more than 80km / h, without relying on low-platform transportation, the industrial vehicle can meet the emergency task requirements of loading and unloading materials in two places over a long distance. In order to ensure the comfort and driving smoothness of industrial vehicles when driving at high speed, the frame and the axle should be connected in an elastic manner with good vibration reduction function. In this case, the industrial vehicle must meet the requirements of low-speed operation and must have the ability to drive at high speed on the highway. Therefore, it is required that the connection between the frame and the axle of the industrial vehicle should have both rigid and elastic connection methods, and ensure that the two connection methods can be converted quickly, safely and reliably.

[0029] (I) The present invention provides a frame system with switchable connection modes between the frame and the front axle. When driving fast, the frame and the front axle are elastically connected, and the vehicle speed can reach a highway driving speed of more than 80 km / h. After arriving at the on-site work area, the elastic connection between the frame and the front axle is switched to a rigid connection, meeting the low-speed driving operation requirements for material loading and unloading in the on-site area.

[0030] Please refer to Figure 1 A frame system capable of switching the connection mode between a frame and a front axle includes a frame, wherein the lower portion of the front end of the frame is connected to a front axle 3 via a leaf spring 2; the frame includes two parallel longitudinal beams 1, and a group of switching components are respectively arranged at the left and right front ends of the two longitudinal beams 1, and the switching components are used to switch the connection mode between the frame and the front axle 3 between an elastic connection and a rigid connection.

[0031] In the above embodiments, there are two connection modes between the frame and the front axle 3, namely, elastic connection and rigid connection. The connection mode between the frame and the front axle 3 can be quickly realized by switching components. When the frame and the front axle 3 are in an elastic connection mode, the vehicle speed can reach more than 80 km / h, and the destination can be reached quickly; after arriving at the working area, the frame and the front axle 3 are switched to a rigid connection mode to meet the low-speed driving operation requirements of the working area. The frame system of the present invention with switchable frame and front axle connection mode has two connection modes between the frame and the front axle 3, which saves the transportation vehicle for transporting the engineering vehicle and saves costs.

[0032] refer to Figure 1 , Figure 2 and Figure 3 , further, specifically, each group of the switching components includes a switching cylinder 4, a horizontal crank arm 5, a push-pull rod 6, a vertical upper plate 7 and a vertical lower plate 8; the horizontal part of the switching cylinder 4 is hinged on the longitudinal beam 1, the middle part of the horizontal crank arm 5 is hinged on the longitudinal beam 1, and the switching cylinder 4 is located behind the horizontal crank arm 5; the upper end of the vertical upper plate 7 is hinged on the longitudinal beam 1, the lower end of the vertical lower plate 8 is hinged on the front axle 3, and the lower end of the vertical upper plate 7 and the upper end of the vertical lower plate 8 are hinged through a first hinge shaft 9; one end of the horizontal crank arm 5 is hinged to the piston rod of the switching cylinder 4, the other end of the horizontal crank arm 5 is connected to the tail end of the push-pull rod 6, and the front end of the push-pull rod 6 is hinged on the first hinge shaft 9;

[0033] refer to Figure 2 and Figure 3 Specifically, the piston rod of the switching cylinder 4 extends out, driving the horizontal crank arm 5 to rotate, the horizontal crank arm 5 pulls the push-pull rod 6, and the push-pull rod 6 pulls the first hinge shaft 9. When the vertical upper plate 7 and the vertical lower plate 8 are collinear in the vertical direction, the frame and the front axle 3 are rigidly connected. At this time, the leaf spring 2 does not work, the engineering vehicle travels at a slow speed, and can withstand a large impact load; reference Figure 4 and Figure 5 , the piston rod of the switching cylinder 4 retracts, the horizontal crank arm 5 rotates, pushing the push-pull rod 6 to move forward, and the push-pull rod 6 pushes the first hinge shaft 9 forward. When the vertical upper plate 7 and the vertical lower plate 8 are not collinear in the vertical direction, the frame and the front axle 3 are elastically connected. At this time, the leaf spring 2 plays a shock-absorbing role, and the engineering vehicle can travel at high speed, meeting the comfort and driving stability.

[0034] Further, refer to Figure 2 The inner side of the longitudinal beam 1 is provided with a cylinder support 10, and the outer side of the longitudinal beam 1 is provided with a crank arm support 11; the switching cylinder 4 is hinged to the cylinder support 10, and the horizontal crank arm member 5 is hinged to the crank arm support 11.

[0035] In the above embodiments, a cylinder support 10 is provided on the inner side of each longitudinal beam 1, and a crank arm support 11 is provided on the outer side of each longitudinal beam 1, so that the switching cylinder 4 is located on the inner side of the longitudinal beam 1, and the vertical upper plate 7 and the vertical lower plate 8 are located on the outer side of the longitudinal beam 1, and are connected in the middle by a horizontal crank arm member 5 and a push-pull rod 6, which saves more space.

[0036] Further, refer to Figure 3 In order to improve the vibration reduction performance between the frame and the front axle 3 , a vibration absorber 12 is provided between the leaf spring 2 and the longitudinal beam 1 .

[0037] Further, refer to Figure 6 The horizontal crank arm 5 includes a driving arm 501 and a driven arm 502, and the angle between the driving arm 501 and the driven arm 502 is 150°.

[0038] Furthermore, the length of the vertical lower plate 8 is greater than the length of the vertical upper plate 7 .

[0039] (II) A method for switching the connection mode between a vehicle frame and a front axle, based on the above vehicle frame system capable of switching the connection mode between the vehicle frame and the front axle, the switching method comprises the following steps: when the vehicle frame and the front axle 3 are switched from an elastic connection to a rigid connection, the switching method comprises the following steps:

[0040] Step 1: Start the vehicle hydraulic system, input hydraulic oil into the switching cylinder 4 installed on each longitudinal beam 1, the piston rod of the switching cylinder 4 extends, drives the horizontal crank arm 5 to rotate, and the horizontal crank arm 5 drives the push-pull rod 6 to move backward, pulling the first articulated shaft 9 to move backward;

[0041] Step 2: When the vertical upper plate 7 and the vertical lower plate 8 are collinear in the vertical direction, the oil circuit of the vehicle hydraulic system is locked, and the frame and the front axle 3 are switched from an elastic connection to a rigid connection;

[0042] Step 3: When the operation of the engineering vehicle is completed, the vehicle hydraulic system is started again, the oil circuit of the vehicle hydraulic system is opened, the hydraulic oil in the switching cylinder 4 is output, the piston rod of the switching cylinder 4 is retracted, the horizontal crank arm 5 is driven to rotate, and the horizontal crank arm 5 drives the push-pull rod 6 to move forward, pushing the first hinge shaft 9 to move forward;

[0043] Step 4: When the vertical upper plate 7 and the vertical lower plate 8 are not collinear in the vertical direction, the oil circuit of the vehicle hydraulic system is locked, and the rigid connection between the frame and the front axle 3 is switched to an elastic connection.

[0044] Although the present invention has been described in detail in this specification by means of general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto on the basis of the present invention. Therefore, these modifications or improvements made without departing from the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A frame system capable of switching the connection mode between the frame and the front axle, characterized in that: The invention comprises a vehicle frame, wherein the lower part of the front end of the vehicle frame is connected to a front axle (3) via a leaf spring (2); the vehicle frame comprises two longitudinal beams (1) arranged in parallel, and a group of switching components are respectively arranged at the left and right sides of the front ends of the two longitudinal beams (1), and the switching components are used to switch the connection mode between the vehicle frame and the front axle (3) between an elastic connection and a rigid connection; a shock absorber (12) is arranged between the leaf spring (2) and the longitudinal beam (1); each group of the switching components comprises a switching cylinder (4), a horizontal crank arm member 5, a push-pull rod (6), a vertical upper plate (7) and a vertical lower plate (8); The switching oil cylinder (4) is horizontally hinged on the longitudinal beam (1), the middle part of the horizontal crank arm (5) is hinged on the longitudinal beam (1), and the switching oil cylinder (4) is located behind the horizontal crank arm (5); the upper end of the vertical upper plate (7) is hinged on the longitudinal beam (1), the lower end of the vertical lower plate (8) is hinged on the front axle (3), and the lower end of the vertical upper plate (7) and the upper end of the vertical lower plate (8) are hinged through a first hinge shaft (9); One end of the horizontal crank arm (5) is hinged to the piston rod of the switching cylinder (4), and the other end of the horizontal crank arm (5) is connected to the tail end of the push-pull rod (6), and the front end of the push-pull rod (6) is hinged to the first hinge shaft (9); The piston rod of the switching oil cylinder (4) extends to drive the horizontal crank arm (5) to rotate, the horizontal crank arm (5) pulls the push-pull rod (6), and the push-pull rod (6) pulls the first hinge shaft (9). When the vertical upper plate (7) and the vertical lower plate (8) are collinear in the vertical direction, the frame and the front axle (3) are rigidly connected; The piston rod of the switching cylinder (4) retracts, the horizontal crank arm (5) rotates, pushing the push-pull rod (6) to move forward, and the push-pull rod (6) pushes the first hinge shaft (9) forward. When the vertical upper plate (7) and the vertical lower plate (8) are not collinear in the vertical direction, the frame and the front axle (3) are elastically connected.

2. The frame system with switchable frame and front axle connection mode according to claim 1, characterized in that: The inner side surface of the longitudinal beam (1) is provided with a cylinder support (10), and the outer side surface of the longitudinal beam (1) is provided with a crank arm support (11); the switching cylinder (4) is hinged on the cylinder support (10), and the horizontal crank arm member (5) is hinged on the crank arm support (11).

3. The frame system with switchable frame and front axle connection mode according to claim 1, characterized in that: The horizontal crank arm member (5) comprises a driving arm (501) and a driven arm (502), and the angle between the driving arm (501) and the driven arm (502) is 150°.

4. The frame system with switchable frame and front axle connection mode according to claim 1, characterized in that: The length of the vertical lower plate (8) is greater than the length of the vertical upper plate (7).

5. A method for switching the connection mode between a vehicle frame and a front axle, characterized in that: Based on the frame system with switchable frame and front axle connection mode according to claim 1, the switching method comprises the following steps: Step 1: Start the vehicle hydraulic system, input hydraulic oil into the switching cylinder (4) installed on each longitudinal beam (1), and the piston rod of the switching cylinder (4) extends to drive the horizontal crank arm (5) to rotate, and the horizontal crank arm (5) drives the push-pull rod (6) to move backward, pulling the first hinge shaft (9) to move backward; Step 2: When the vertical upper plate 7 and the vertical lower plate (8) are collinear in the vertical direction, the oil circuit of the vehicle hydraulic system is locked, and the vehicle frame and the front axle (3) are switched from an elastic connection to a rigid connection; Step 3: start the vehicle hydraulic system again, open the oil circuit of the vehicle hydraulic system, output the hydraulic oil in the switching cylinder (4), retract the piston rod of the switching cylinder (4), drive the horizontal crank arm (5) to rotate, and the horizontal crank arm (5) drives the push-pull rod (6) to move forward, pushing the first hinge shaft (9) to move forward; Step 4: When the vertical upper plate (7) and the vertical lower plate (8) are not collinear in the vertical direction, the oil circuit of the vehicle hydraulic system is locked, and the rigid connection between the vehicle frame and the front axle (3) is switched to an elastic connection.

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