A transfer case and method of operating a transfer case

Abstract

The application discloses a transfer case and a working state control system and method thereof, and belongs to the technical field of engineering machinery control. The working state of the transfer case includes a power take-off state and a driving state. The transfer case comprises a first guide rod, a second guide rod and a mistake-proofing assembly. The mistake-proofing assembly comprises a reset spring and a mistake-proofing plate. The mistake-proofing plate is provided with a first limiting hole and a third limiting hole. When the transfer case is in the power take-off state, a 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. When the transfer case is in the driving state, the second guide rod moves horizontally to be separated from the third limiting hole, the first guide rod moves to make a large-diameter section located in the first limiting hole, the mistake-proofing plate is driven to move downward, and the second guide rod and the third limiting hole are mutually misaligned. The application effectively avoids the state that the driving state and the power take-off state appear simultaneously, accurately controls the switching of the driving state and the power take-off state, and improves the safety and reliability of the power take-off process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engineering machinery control technology, and particularly relates to a transfer case and a working state control system and method thereof. BACKGROUND

[0002] The crane product is good at high off-road performance and high-speed driving, and has been widely applied to many industries such as oil fields and wind power. The transfer case constitutes an important component part of the crane, and is located in the middle position 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 process of the transfer case, due to human misoperation, the running state and the power take-off state are out of gear and slip gear, which causes the drive mechanism to be damaged, and seriously affects the safety and normal driving function of the vehicle. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art, and provides a transfer case and a working state control system and method thereof, which effectively avoid the simultaneous state of the running state and the power take-off state, and accurately control the switching of the running state and the power take-off state.

[0005] The present application provides the following technical solutions:

[0006] In a first aspect, a transfer case is provided, the working state of the transfer case includes a power take-off state and a running state, and the transfer case includes a main case, a sub-case and an error-proofing assembly; the main case includes an input shaft assembly and a first guide rod connected thereto, and 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 sub-case includes a shift fork and a second guide rod connected thereto, and the shift fork is used to drive the second guide rod to move horizontally; the error-proofing assembly is arranged between the main case and the sub-case, and includes a reset spring and an error-proofing plate; one end of the reset spring is mounted on one side of the error-proofing plate, and the other end is fixed to the case body of the main case, and is used to drive the error-proofing plate to move up and down; the error-proofing plate is provided with 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 the form of a vertical one, and the third limiting hole is in the form of a horizontal one; in the power take-off state of the transfer case, 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 to limit the error-proofing plate to move up and down; in the running state of the transfer case, the second guide rod moves horizontally to disengage from the third limiting hole, the first guide rod moves to make the large-diameter section located in the first limiting hole, drives the error-proofing plate to move downward, and the second guide rod and the third limiting hole are misaligned with each other.

[0007] As an optional technical solution of the present application, the error-proof plate is further provided with a second limiting hole, and the error-proof plate is installed on the main box body through a fixing pin matched with the second limiting hole.

[0008] As an optional technical solution of the present application, the second limiting hole is in vertical linear type.

[0009] As an optional technical solution of the present application, the error-proof plate is in S type.

[0010] As an optional technical solution of the present application, the first limiting hole and the third limiting hole have the same hole diameter.

[0011] As an optional technical solution of the present application, the input shaft assembly comprises a high-grade hydraulic oil path and a first guide rod connecting sleeve; the first guide rod connecting sleeve is connected with the first guide rod, and the high-grade hydraulic oil path is connected to the first guide rod connecting sleeve.

[0012] As an optional technical solution of the present application, the second guide rod comprises a small-diameter section and a large-diameter section; in the power take-off state of the transfer box, the small-diameter section of the second guide rod is located at the oil channel of the auxiliary box, so that the oil channel is open; in the driving state of the transfer box, the large-diameter section of the second guide rod is located at the oil channel of the auxiliary box, so that the oil channel is closed.

[0013] In the second aspect, a working state control system of the transfer box of the first aspect is provided, comprising: a signal receiving module and a control module; the signal receiving module is connected with the control module, and is used for receiving a working state signal and sending the working state signal to the control module; the control module is connected with the input shaft assembly and the yoke, and is used for changing the positional relationship between the first guide rod and the second guide rod and the error-proof plate according to the received working state signal, so as to switch the working state of the transfer box by controlling the input shaft assembly and the yoke.

[0014] In the third aspect, a control method based on the working state control system of the second aspect is provided, comprising: acquiring the working state signal;

[0015] When the power take-off state signal is acquired, the high-grade hydraulic oil path is turned on, the first guide rod connecting sleeve is driven to move horizontally, and the small-diameter section of the first guide rod is located in the first limiting hole; the yoke is controlled to drive the second guide rod to move horizontally, and one end of the second guide rod enters the third limiting hole;

[0016] When the driving state signal is acquired, the yoke is controlled to drive the second guide rod to move reversely, so that one end of the second guide rod is separated from the third limiting hole; the high-grade hydraulic oil path is closed, the first guide rod connecting sleeve moves reversely, and the large-diameter section of the first guide rod is located in the first limiting hole.

[0017] Compared with the prior art, the application has the beneficial effects that:

[0018] The transfer case provided by the application effectively avoids the state that the driving state and the power take-off state appear at the same time, greatly reduces the situation of gear confusion and gear slip in the driving state and the power take-off state, and improves the safety and reliability.

[0019] The control system provided by the application realizes accurate control of the switching of the driving state and the power take-off state of the transfer case through the control module, and improves the stability of the working state switching of the transfer case. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic view of the error-proof assembly in the embodiment of the application;

[0021] Figure 2 is a structure schematic view of the power take-off state in the embodiment of the application;

[0022] Figure 3 is a structure schematic view of the driving state in the embodiment of the application;

[0023] Figure 4 is a schematic view of the input shaft assembly and the first guide rod in the embodiment of the application;

[0024] Figure 5 is a structure schematic view of the hydraulic control system in the embodiment of the application.

[0025] In the figure, 1 is a reset spring, 2 is an error-proof plate, 3 is a fixed pin, 4 is a first guide rod, 5 is a second guide rod, 2.1 is a first limiting hole, 2.2 is a second limiting hole, 2.3 is a third limiting hole, 6.1 is a high-gear hydraulic oil path, 6.2 is a first guide rod connecting sleeve, 1.1 is an electric proportional overflow valve, 1.2 is a pressure sensor, 1.3 is a low-gear electromagnetic valve, 1.4 is a high-gear electromagnetic valve, 1.5 is a high-gear piston cylinder, and 1.6 is a low-gear piston cylinder. DETAILED DESCRIPTION

[0026] The application will be further described below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0027] Embodiment 1

[0028] The embodiment provides a transfer case, and the working state of the transfer case includes a power take-off state and a driving state. The transfer case includes a main case, a sub-case and an error-proof assembly.

[0029] As Figure 1As shown, the error-proof assembly is arranged between the main box and the auxiliary box, which comprises a reset spring 1 and an error-proof plate 2. One end of the reset spring 1 is mounted on one side of the error-proof plate 2, and the other end is fixed on the box body of the main box, for driving the error-proof plate 2 to move up and down. The error-proof 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 vertically linear, for driving the error-proof plate 2 to move down when switched to the running state. The third limiting hole 2.3 is horizontally linear, for being in a misaligned relationship with the second guide rod 5 after the error-proof plate 2 moves down. The error-proof plate 2 is further provided with a second limiting hole 2.2, and the error-proof plate 2 is mounted on the main box body through the fixing pin 3 matched with the second limiting hole 2.2.

[0030] Further, the second limiting hole 2.2 is vertically linear, facilitating the up and down movement of the error-proof plate 2 driven by the reset spring 1.

[0031] Further, the error-proof plate 2 is S-shaped.

[0032] Further, the hole diameters of the first limiting hole 2.1 and the third limiting hole 2.3 are the same. The hole diameter of the first limiting hole 2.1 is larger than the diameter of the small-diameter section of the first guide rod 4, and the hole diameter of the third limiting hole 2.3 is larger than the diameter of the large-diameter section of the second guide rod 5.

[0033] As shown in the drawings, Figure 2 when the transfer box is in the power take-off 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 jointly cooperate to limit the up and down movement of the error-proof plate 2. The interlocking of the running state and the power take-off state is realized, and even if the operator accidentally selects the running gear at this time, mechanical operation cannot be performed, avoiding the phenomenon of random gear selection caused by misoperation; at the same time, the single guide rod is also locked in this state and will not slip out, avoiding the occurrence of gear slipping.

[0034] As shown in the drawings, Figure 3 when the transfer box is in the running state, the second guide rod 5 moves horizontally out of the third limiting hole 2.3, the first guide rod 4 moves so that the large-diameter section is located in the first limiting hole 2.1, driving the error-proof plate 2 to move down, 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 misoperated, the second guide rod 5 is not easy to enter the error-proof plate 2, thereby avoiding the random power take-off operation in this state.

[0035] Further, the second guide rod 5 comprises a small-diameter section and a large-diameter section; in the power take-off state of the transfer case, the small-diameter section of the second guide rod 5 is located at the oil passage of the auxiliary gearbox, so that the oil passage is open, and the lubricating oil flows into the auxiliary gearbox through the oil passage; in the driving state of the transfer case, the large-diameter section of the second guide rod 5 is located at the oil passage of the auxiliary gearbox, so that the oil passage is closed, and the rational use of lubricating resources is achieved.

[0036] As shown in Figure 4 , the main gearbox comprises 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 comprises a small-diameter section and a large-diameter section.

[0037] Further, the input shaft assembly comprises a high-gear hydraulic oil path 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-gear hydraulic oil path 6.1 leads to the first guide rod connecting sleeve 6.2.

[0038] The auxiliary gearbox comprises a shift fork and a second guide rod 5 connected to each other, and the shift fork is used to drive the second guide rod 5 to move horizontally.

[0039] Embodiment 2

[0040] This embodiment is based on embodiment 1, and provides a working state control system of a transfer case. It comprises a signal receiving module and a control module.

[0041] The signal receiving module is connected to the control module, and is used to receive the working state signal and send it to the control module.

[0042] The control module is connected to the input shaft assembly and the shift fork, and is used to change the positional relationship between the first guide rod 4 and the second guide rod 5 and the error-proof plate 2 according to the received working state signal, so as to switch the working state of the transfer case by controlling the input shaft assembly and the shift fork.

[0043] This embodiment uses a hydraulic control system to control the input shaft assembly. As shown in Figure 5 , the hydraulic control system comprises an electric proportional overflow valve 1.1, a pressure sensor 1.2, a low-gear electromagnetic valve 1.3, a high-gear electromagnetic valve 1.4, a high-gear piston cylinder 1.5, and a low-gear piston cylinder 1.6.

[0044] The electric proportional overflow valve 1.1 is opened, the crane is started, and the whole vehicle is in a low-speed state. At this time, the low-grade electromagnetic valve 1.3 is opened. When the crane needs to switch to the power take-off state, the four hydraulic oil cylinders 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-grade electromagnetic valve 1.3 is closed, and the pressure of the electric proportional overflow valve 1.1 rapidly decreases. When the pressure sensor 1.2 detects that the pressure P is lower than 5 bar, the high-grade electromagnetic valve 1.4 is opened, at this time, the pressure of the electric proportional overflow valve 1.1 rises, the high-grade piston cylinder 1.5 moves from the rodless cavity to the rod cavity, and then the high-grade hydraulic oil circuit 6.1 is turned on.

[0045] When the crane needs to switch to the running state, the running state signal sent by the signal receiving module is obtained, the high-grade electromagnetic valve 1.4 is closed, and the pressure of the electric proportional overflow valve 1.1 rapidly decreases. When the pressure sensor 1.2 detects that the pressure P is lower than 5 bar, the low-grade electromagnetic valve 1.3 is opened, at this time, the pressure of the electric proportional overflow valve 1.1 rises, the low-grade piston cylinder 1.6 moves from the rodless cavity to the rod cavity, and then the high-grade hydraulic oil circuit 6.1 is turned off, the low-grade hydraulic oil circuit is turned on, the crane is in a low-speed state, and the vehicle speed is less than 60 km / h.

[0046] Through the above precise control, the power take-off state and the running state of the transfer box are precisely controlled, the state of the running state and the power take-off state is effectively avoided, and the stable transition of the whole switching process is ensured.

[0047] Embodiment 3

[0048] The embodiment provides a working state control method of a transfer box based on the embodiments 1 and 2. The method comprises the following steps:

[0049] The working state signal is obtained.

[0050] When the power take-off state signal is obtained, the high-grade hydraulic oil circuit 6.1 is turned on, the first guide rod connecting sleeve 6.3 is driven to move horizontally, so that the small-diameter section of the first guide rod 4 is located in the first limiting hole 2.1; the shift fork 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 limiting hole 2.3.

[0051] In the embodiment, as shown in the figure, Figures 2-4 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 to the left until the small-diameter section of the first guide rod 4 is located in the first limiting hole 2.1. When the power take-off gear of the shift fork is obtained, the shift fork drives the second guide rod 5 to move to the right, so that the right end of the second guide rod 5 enters the third limiting hole 2.3.

[0052] When the driving state signal is acquired, the control fork drives the second guide rod 5 to move reversely, so that one end of the second guide rod 5 is separated from the third limiting hole 2.3; the high gear hydraulic oil way 6.1 is closed, and the first guide rod connecting sleeve 6.3 moves reversely, driving the large diameter section of the first guide rod 4 to be located in the first limiting hole 2.1.

[0053] In the embodiment, when the driving state signal is acquired, the power take-off gear of the control fork is exited, the control fork drives the second guide rod 5 to move leftward, and the first guide rod connecting sleeve 6.3 drives the first guide rod 4 to move rightward until the large diameter section is located in the first limiting hole 2.1. At this time, the reset spring 1 is in a stretched state, the error-proof plate 2 moves downward as a whole, and the third limiting hole 2.3 is dislocated with the center of the outer circle of the second guide rod 5.

[0054] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0055] In the description of the present application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0056] The above is only the preferred embodiment of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the present application.

Claims

1. A transfer case characterized by: The working state of the transfer case includes a power take-off state and a driving state, and the transfer case comprises a main case, a sub case and an error-proof assembly; The main case comprises 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) comprises a small-diameter section and a large-diameter section; The sub case comprises a shift fork and a second guide rod (5) connected to each other, and the shift fork is used to drive the second guide rod (5) to move horizontally; The error-proof assembly is arranged between the main case and the sub case, and comprises a reset spring (1) and an error-proof plate (2); one end of the reset spring (1) is mounted on one side of the error-proof plate (2), and the other end is fixed on the case body of the main case, and is used to drive the error-proof plate (2) to move up and down; The error-proof 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 linear type, and the third limiting hole (2.3) is in a horizontal linear type; When the transfer case is in the power take-off state, the small-diameter section of the first guide rod (4) is located in the first limiting hole (2.1), and one end of the second guide rod (5) is connected to the third limiting hole (2.3); 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 error-proof plate (2) to move up and down; When the transfer case is in the driving state, the second guide rod (5) moves horizontally to be separated from the third limiting hole (2.3), the first guide rod (4) moves to make the large-diameter section located in the first limiting hole (2.1), and drives the error-proof plate (2) to move downward, and the second guide rod (5) and the third limiting hole (2.3) are misaligned with each other.

2. The transfer case of claim 1, wherein: The error-proof plate (2) is further provided with a second limiting hole (2.2), and the error-proof plate (2) is mounted on the case body of the main case through a fixed pin (3) matched with the second limiting hole (2.2).

3. The transfer case of claim 2, wherein: The second limiting hole (2.2) is in a vertical linear type.

4. The transfer case of claim 1, wherein: The error-proof plate (2) is in an S type.

5. The transfer case of claim 1, wherein: The hole diameters of the first limiting hole (2.1) and the third limiting hole (2.3) are the same.

6. The transfer case of claim 1, wherein: The input shaft assembly comprises a high-gear hydraulic oil path (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-gear hydraulic oil path (6.1) leads to the first guide rod connecting sleeve (6.2).

7. The transfer case of claim 1, wherein: The second guide rod (5) comprises a small-diameter section and a large-diameter section; When the transfer case is in the power take-off state, the small-diameter section of the second guide rod (5) is located at an oil passage of the sub case, so that the oil passage is open; 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 sub case, so that the oil passage is closed.

8. A working condition control system of the transfer case as set forth in claim 6, characterized by Comprise: 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 the working state signal to the control module; The control module is connected with the input shaft assembly and the shifting fork, and is used for changing the positional relationship between the first guide rod (4) and the second guide rod (5) and the error-proof plate (2) by controlling the input shaft assembly and the shifting fork according to the received working state signal, so as to switch the working state of the transfer case.

9. A control method of a working state control system according to claim 8, characterized by, Comprise: Acquiring the working state signal; When the power take-off state signal is acquired, the high gear hydraulic oil path (6.1) is turned on, the first guide rod connecting sleeve (6.2) is driven to move horizontally, so that the small diameter section of the first guide rod (4) is located in the first limiting hole (2.1); the shifting fork 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 limiting hole (2.3); When the driving state signal is acquired, the shifting fork is controlled to drive the second guide rod (5) to move reversely, so that one end of the second guide rod (5) is separated from the third limiting hole (2.3); the high gear hydraulic oil path (6.1) is closed, the first guide rod connecting sleeve (6.2) moves reversely, and the large diameter section of the first guide rod (4) is located in the first limiting hole (2.1).

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