Transfer case and working state control system and method thereof

Abstract

The invention discloses a transfer case and a working state control system and method thereof, and belongs to the technical field of engineering machinery control. Working states of the transfer case comprise a power take-off state and a driving state, the transfer case comprises a first guide rod, a second guide rod and an error-proof assembly, and the error-proof assembly comprises a reset spring and an error-proof plate. A first limiting hole and a third limiting hole are formed in the mistake-proof plate; when the transfer case is in a power take-off state, the small-diameter section of the first guide rod is located in the first limiting hole, and one end of the second guide rod is connected with the third limiting hole. When the transfer case is in a traveling state, the second guide rod horizontally moves to be separated from the third limiting hole, the first guide rod moves to enable the large-diameter section to be located in the first limiting hole, the mistake-proof plate is driven to move downwards, and the second guide rod and the third limiting hole are staggered. The driving state and the power take-off state are effectively prevented from occurring at the same time, switching of the driving state and the power take-off state is accurately controlled, and the safety and reliability of the power take-off process are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery control, and in particular relates to a transfer case and a control system and method for its working state. Background Art

[0002] Crane products are good at high off-road performance and high-speed driving, and have been widely used in many industries such as oil fields and wind power. The transfer case is an important component of the crane, and is located between the gearbox and the drive axle in the chassis layout. The power input end of the transfer case is the output of the gearbox, and the output end is the drive axle.

[0003] At present, in the use of transfer cases, due to human misoperation, the driving state and power take-off state are often out of gear or slipping, which leads to damage to the drive mechanism and seriously affects the safety and normal driving function of the whole vehicle. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a transfer case and its working state control system and method, which can effectively avoid the simultaneous occurrence of the driving state and the power taking state, and accurately control the switching between the driving state and the power taking state.

[0005] The present invention provides the following technical solutions: In a first aspect, a transfer case is provided, wherein the working states of the transfer case include a power-taking state and a driving state, and the transfer case includes a main case, an auxiliary case and an anti-error assembly; the main case includes a connected input shaft assembly and a first guide rod, the input shaft assembly is used to drive the first guide rod to move horizontally; the first guide rod includes a small-diameter section and a large-diameter section; the auxiliary case includes a connected fork member and a second guide rod, the fork member is used to drive the second guide rod to move horizontally; the anti-error assembly is arranged between the main case and the auxiliary case, and includes a return spring and an anti-error plate; one end of the return spring is installed on one side of the anti-error plate, and the other end is fixed to the case body of the main case, and is used to drive the anti-error plate to move up and down; the anti-error plate is provided with a A first limiting hole for connecting the first guide rod and a third limiting hole for connecting the second guide rod; the first limiting hole is in a vertical I-shape, and the third limiting hole is in a horizontal I-shape; when the transfer case is in a power-taking state, the small-diameter section of the first guide rod is located in the first limiting hole, and one end of the second guide rod is connected to the third limiting hole, and the first guide rod, the first limiting hole, the second guide rod and the third limiting hole cooperate together to limit the up and down movement of the anti-error plate; when the transfer case is in a driving state, the second guide rod moves horizontally to disengage from the third limiting hole, and the first guide rod moves so that the large-diameter section is located in the first limiting hole, driving the anti-error plate to move downward, and the second guide rod and the third limiting hole are offset from each other.

[0006] As an optional technical solution of the present invention, the anti-error plate is further provided with a second limiting hole, and the anti-error plate is installed on the main box body by a fixing pin that cooperates with the second limiting hole.

[0007] As an optional technical solution of the present invention, the second limiting hole is in a vertical straight shape.

[0008] As an optional technical solution of the present invention, the anti-error plate is S-shaped.

[0009] As an optional technical solution of the present invention, the first limiting hole and the third limiting hole have the same hole diameter.

[0010] As an optional technical solution of the present invention, the input shaft assembly includes a high-grade hydraulic oil circuit and a first guide rod connecting sleeve; the first guide rod connecting sleeve is connected to the first guide rod, and the high-grade hydraulic oil circuit leads to the first guide rod connecting sleeve.

[0011] As an optional technical solution of the present invention, the second guide rod includes a small diameter section and a large diameter section; when the transfer case is in a power taking state, the small diameter section of the second guide rod is located at the oil passage of the auxiliary case, so that the oil passage is conductive; when the transfer case is in a driving state, the large diameter section of the second guide rod is located at the oil passage of the auxiliary case, so that the oil passage is closed.

[0012] In a second aspect, there is provided a transfer case working state control system as described in the first aspect, comprising: a signal receiving module and a control module; the signal receiving module is connected to the control module, and is used to receive a working state signal and send it to the control module; the control module is connected to the input shaft assembly and the fork member, and is used to change the positional relationship between the first guide rod and the second guide rod and the anti-error plate by controlling the input shaft assembly and the fork member according to the received working state signal, so as to switch the working state of the transfer case.

[0013] In a third aspect, a control method of the working state control system according to the second aspect is provided, comprising: acquiring the working state signal; When the power take-off state signal is obtained, the high-grade hydraulic oil circuit is turned on to drive the first guide rod connecting sleeve to move horizontally, so that the small diameter section of the first guide rod is located in the first limit hole; the shift fork member is controlled to drive the second guide rod to move horizontally, so that one end of the second guide rod enters the third limit hole; When the driving status signal is obtained, the control fork member drives the second guide rod to move in the opposite direction, so that one end of the second guide rod is disengaged from the third limit hole; the high-end hydraulic oil circuit is closed, and the first guide rod connecting sleeve moves in the opposite direction, driving the large diameter section of the first guide rod to be located in the first limit hole.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The transfer case provided by the present invention effectively avoids the situation where the driving state and the power taking state appear at the same time through the cooperation of the error prevention component with the first guide rod and the second guide rod, greatly reduces the situation where the driving state and the power taking state are disordered or slipped, and improves safety and reliability. The control system provided by the present invention realizes accurate control of the switching between the driving state and the power take-off state of the transfer case through the control module, thereby improving the stability of the switching of the working state of the transfer case. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the structure of an error-proofing component in an embodiment of the present invention; Figure 2 is a structural schematic diagram of a power taking state in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the driving state in an embodiment of the present invention; Figure 4 is a schematic diagram of an input shaft assembly and a first guide rod in an embodiment of the present invention; Figure 5 Schematic diagram of the structure of the hydraulic control system in the embodiment of the present invention.

[0016] Markings in the figure are: 1. Reset spring; 2. Anti-error plate; 3. Fixing pin; 4. First guide rod; 5. Second guide rod; 2.1. First limit hole; 2.2. Second limit hole; 2.3. Third limit hole; 6.1. High-end hydraulic oil circuit; 6.2. First guide rod connecting sleeve; 1.1. Electric proportional relief valve; 1.2. Pressure sensor; 1.3. Low-end solenoid valve; 1.4. High-end solenoid valve; 1.5. High-end piston cylinder; 1.6. Low-end piston cylinder. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] Example 1 This embodiment provides a transfer case, wherein the working state of the transfer case includes a power taking state and a driving state. The transfer case includes a main case, a sub-case and an error prevention component.

[0019] like Figure 1As shown, the error prevention component is arranged between the main box and the auxiliary box, and includes a reset spring 1 and an error prevention plate 2. One end of the reset spring 1 is installed on one side of the error prevention plate 2, and the other end is fixed on the box body of the main box, which is used to drive the error prevention plate 2 to move up and down. The error prevention plate 2 is provided with a first limiting hole 2.1 for connecting the first guide rod 4 and a third limiting hole 2.3 for connecting the second guide rod 5. The first limiting hole 2.1 is in a vertical straight line shape, which is used for the first guide rod 4 to drive the error prevention plate 2 to move downward when switching to the driving state. The third limiting hole 2.3 is in a horizontal straight line shape, which is used for the third limiting hole 2.3 to be in a dislocated relationship with the second guide rod 5 after the error prevention plate 2 moves downward. The error prevention plate 2 is also provided with a second limiting hole 2.2, and the error prevention plate 2 is installed on the main box body by a fixing pin 3 that cooperates with the second limiting hole 2.2.

[0020] Furthermore, the second limiting hole 2.2 is in a vertical straight line shape, which is convenient for the reset spring 1 to drive the anti-error plate 2 to move up and down.

[0021] Furthermore, the anti-error plate 2 is S-shaped.

[0022] Furthermore, the first limiting hole 2.1 and the third limiting hole 2.3 have the same diameter. The first limiting hole 2.1 has a diameter larger than the diameter of the small diameter section of the first guide rod 4, and the third limiting hole 2.3 has a diameter larger than the diameter of the large diameter section of the second guide rod 5.

[0023] like Figure 2 As shown, when the transfer case is in the power-taking state, the small-diameter section of the first guide rod 4 is located in the first limit hole 2.1, one end of the second guide rod 5 is connected to the third limit hole 2.3, and the first guide rod 4, the first limit hole 2.1, the second guide rod 5 and the third limit hole 2.3 cooperate to limit the up and down movement of the anti-error plate 2. The interlocking of the driving state and the power-taking state is realized, and even if the operator accidentally shifts the driving gear at this time, mechanical operation cannot be performed, avoiding the disorderly gear phenomenon caused by the misoperation phenomenon; at the same time, in this state, the single guide rod is also locked, and it will not slide out, and the gear slipping phenomenon is also avoided.

[0024] like Figure 3 As shown, when the transfer case is in the driving state, the second guide rod 5 moves horizontally to disengage from the third limiting hole 2.3, and the first guide rod 4 moves so that the large diameter section is located in the first limiting hole 2.1, driving the anti-error plate 2 to move downward, and the second guide rod 5 and the third limiting hole 2.3 are misaligned with each other. At this time, even if the power take-off gear is operated by mistake, the second guide rod 5 is not easy to enter the anti-error plate 2, thereby avoiding random power take-off operations in this state.

[0025] Furthermore, the second guide rod 5 includes a small diameter section and a large diameter section; when the transfer case is in the power taking state, the small diameter section of the second guide rod 5 is located at the oil passage of the auxiliary case, so that the oil passage is conductive and the lubricating oil flows into the auxiliary case through the oil passage; when the transfer case is in the driving state, the large diameter section of the second guide rod 5 is located at the oil passage of the auxiliary case, so that the oil passage is closed, thereby realizing the rational use of lubrication resources.

[0026] like Figure 4 As shown, the main box includes an input shaft assembly and a first guide rod 4 connected to each other, and the input shaft assembly is used to drive the first guide rod 4 to move horizontally; the first guide rod 4 includes a small diameter section and a large diameter section.

[0027] Furthermore, the input shaft assembly comprises a high-grade hydraulic oil circuit 6.1 and a first guide rod connecting sleeve 6.2; the first guide rod connecting sleeve 6.2 is connected to the first guide rod 4, and the high-grade hydraulic oil circuit 6.1 leads to the first guide rod connecting sleeve 6.2.

[0028] The auxiliary box includes a fork member and a second guide rod 5 connected to each other, and the fork member is used to drive the second guide rod 5 to move horizontally.

[0029] Example 2 This embodiment provides a transfer case working state control system based on the first embodiment, including: a signal receiving module and a control module.

[0030] The signal receiving module is connected to the control module and is used for receiving a working status signal and sending it to the control module.

[0031] The control module is connected to the input shaft assembly and the fork member, and is used to change the position relationship between the first guide rod 4 and the second guide rod 5 and the anti-error plate 2 by controlling the input shaft assembly and the fork member according to the received working status signal, so as to switch the working state of the transfer case.

[0032] This embodiment uses a hydraulic control system to control the input shaft assembly. Figure 5 As shown, the hydraulic control system includes an electric proportional relief valve 1.1, a pressure sensor 1.2, a low-range solenoid valve 1.3, a high-range solenoid valve 1.4, a high-range piston cylinder 1.5 and a low-range piston cylinder 1.6.

[0033] The electric proportional relief valve 1.1 is opened. After the crane is started, the whole vehicle travels at a low speed, and the low-speed solenoid valve 1.3 is opened. When the crane needs to switch to the power take-off state, the four hydraulic cylinder legs support the crane so that the crane tires are off the ground. At this time, the power take-off state signal sent by the signal receiving module is obtained, the low-speed solenoid valve 1.3 is closed, and the pressure of the electric proportional valve relief valve 1.1 drops rapidly. When the pressure sensor 1.2 detects that the pressure P is lower than 5 bar, the high-speed solenoid valve 1.4 is powered on and opened. At this time, the pressure of the electric proportional relief valve 1.1 rises, and the high-speed piston cylinder 1.5 moves from the rodless chamber to the rod chamber, thereby connecting the high-speed hydraulic oil circuit 6.1.

[0034] When the crane needs to switch to the driving state, it obtains the driving state signal sent by the signal receiving module, the high-speed solenoid valve 1.4 is closed, and the pressure of the electric proportional valve overflow valve 1.1 drops rapidly. When the pressure sensor 1.2 detects that the pressure P is lower than 5 bar, the low-speed solenoid valve 1.3 is powered on and opened. At this time, the pressure of the electric proportional overflow valve 1.1 rises, and the low-speed piston cylinder 1.6 moves from the rodless cavity to the rod cavity, thereby disconnecting the high-speed hydraulic oil circuit 6.1 and connecting the low-speed hydraulic oil circuit. The crane travels at a low speed, and the vehicle speed is less than 60km / h.

[0035] The above precise control can realize precise control of the power take-off state and driving state of the transfer case, effectively avoiding the situation where the driving state and the power take-off state appear at the same time, and also ensure the stable transition of the entire switching process.

[0036] Example 3 This embodiment provides a method for controlling the working state of a transfer case based on Embodiments 1 and 2. The method comprises: The working status signal is obtained.

[0037] When the power take-off state signal is obtained, the high-grade hydraulic oil circuit 6.1 is opened to drive the first guide rod connecting sleeve 6.3 to move horizontally, so that the small diameter section of the first guide rod 4 is located in the first limit hole 2.1; the control fork member drives the second guide rod 5 to move horizontally, so that one end of the second guide rod 5 enters the third limit hole 2.3.

[0038] In this embodiment, Figure 2-4 As shown, when the power take-off state signal is obtained, the first guide rod connecting sleeve 6.3 drives the first guide rod 4 to move leftward until the small diameter section of the first guide rod 4 is located in the first limit hole 2.1. When the power take-off state signal is obtained, the power take-off gear of the fork is engaged, and the fork drives the second guide rod 5 to move rightward, so that the right end of the second guide rod 5 enters the third limit hole 2.3.

[0039] When the driving status signal is obtained, the control fork member drives the second guide rod 5 to move in the reverse direction, so that one end of the second guide rod 5 is disengaged from the third limit hole 2.3; the high-grade hydraulic oil circuit 6.1 is closed, and the first guide rod connecting sleeve 6.3 moves in the reverse direction, driving the large diameter section of the first guide rod 4 to be located in the first limit hole 2.1.

[0040] In this embodiment, when the driving state signal is obtained, the power take-off gear of the shift fork is exited, the shift fork drives the second guide rod 5 to move to the left, and the first guide rod connecting sleeve 6.3 drives the first guide rod 4 to move to the right until the large diameter section is located in the first limit hole 2.1. At this time, the reset spring 1 is in a stretched state, the anti-error plate 2 moves downward as a whole, and the third limit hole 2.3 is misaligned with the outer circle center of the second guide rod 5.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A transfer case, characterized in that: The working state of the transfer case includes a power take-off state and a driving state, and the transfer case includes a main case, a sub-case and an error-proofing component; The main box comprises an input shaft assembly and a first guide rod (4) connected to each other, the input shaft assembly being used to drive the first guide rod (4) to move horizontally; the first guide rod (4) comprises a small diameter section and a large diameter section; The auxiliary box comprises a fork member and a second guide rod (5) connected to each other, the fork member being used to drive the second guide rod (5) to move horizontally; The error prevention assembly is arranged between the main box and the auxiliary box, and comprises a return spring (1) and an error prevention plate (2); one end of the return spring (1) is mounted on one side of the error prevention plate (2), and the other end is fixed to the box body of the main box, and is used to drive the error prevention plate (2) to move up and down; The anti-error plate (2) is provided with a first limiting hole (2.1) for connecting to the first guide rod (4) and a third limiting hole (2.3) for connecting to the second guide rod (5); the first limiting hole (2.1) is in a vertical straight line shape, and the third limiting hole (2.3) is in a horizontal straight line shape; When the transfer case is in a power-taking state, the small-diameter section of the first guide rod (4) is located in the first limiting hole (2.1), one end of the second guide rod (5) is connected to the third limiting hole (2.3), and the first guide rod (4), the first limiting hole (2.1), the second guide rod (5) and the third limiting hole (2.3) cooperate with each other to limit the upward and downward movement of the anti-error plate (2); When the transfer case is in a driving state, the second guide rod (5) moves horizontally to disengage from the third limiting hole (2.3), and the first guide rod (4) moves so that the large diameter section is located in the first limiting hole (2.1), driving the anti-misalignment plate (2) to move downward, so that the second guide rod (5) and the third limiting hole (2.3) are mutually offset.

2. The transfer case according to claim 1, characterized in that: The anti-error plate (2) is also provided with a second limiting hole (2.2), and the anti-error plate (2) is mounted on the main box body via a fixing pin (3) that cooperates with the second limiting hole (2.2).

3. The transfer case according to claim 2, characterized in that: The second limiting hole (2.2) is in a vertical straight line shape.

4. The transfer case according to claim 1, characterized in that: The anti-error plate (2) is S-shaped.

5. The transfer case according to claim 1, characterized in that: The first limiting hole (2.1) and the third limiting hole (2.3) have the same hole diameter.

6. The transfer case according to claim 1, characterized in that: The input shaft assembly comprises a high-grade hydraulic oil circuit (6.1) and a first guide rod connecting sleeve (6.2); The first guide rod connecting sleeve (6.2) is connected to the first guide rod (4), and the high-grade hydraulic oil circuit (6.1) leads to the first guide rod connecting sleeve (6.2).

7. The transfer case according to claim 1, characterized in that: The second guide rod (5) comprises a small diameter section and a large diameter section; When the transfer case is in a power-taking state, the small-diameter section of the second guide rod (5) is located at the oil passage of the auxiliary case, so that the oil passage is open; When the transfer case is in a driving state, the large diameter section of the second guide rod (5) is located at the oil passage of the auxiliary case, so that the oil passage is closed.

8. A transfer case operating state control system according to any one of claims 1 to 7, characterized in that: It includes: a signal receiving module and a control module; The signal receiving module is connected to the control module and is used to receive the working status signal and send it to the control module; The control module is connected to the input shaft assembly and the fork member, and is used to change the positional relationship between the first guide rod (4) and the second guide rod (5) and the anti-error plate (2) by controlling the input shaft assembly and the fork member according to the received working state signal, so as to switch the working state of the transfer case.

9. A control method based on the working state control system according to claim 8, characterized in that: include: Acquiring the working status signal; When a power take-off state signal is obtained, the high-grade hydraulic oil circuit (6.1) is opened to drive the first guide rod connecting sleeve (6.3) to move horizontally, so that the small diameter section of the first guide rod (4) is located in the first limit hole (2.1); the shift fork member is controlled to drive the second guide rod (5) to move horizontally, so that one end of the second guide rod (5) enters the third limit hole (2.3); When a driving status signal is obtained, the control fork member drives the second guide rod (5) to move in the reverse direction, so that one end of the second guide rod (5) is disengaged from the third limit hole (2.3); the high-grade hydraulic oil circuit (6.1) is closed, and the first guide rod connecting sleeve (6.3) moves in the reverse direction, driving the large-diameter section of the first guide rod (4) to be located in the first limit hole (2.1).

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