Mechanical HST electric control speed change device

Abstract

A mechanical HST electric control speed change device comprises a controller, an angle sensor, two safety switches, a driver, a linear motor, a control assembly and a swing arm assembly, the angle sensor and the two safety switches are electrically connected with the controller, and the controller, the driver and the linear motor are electrically connected in sequence. The angle sensor and one safety switch are installed on the control assembly, when the control assembly is shifted, the control assembly can drive the control assembly to act, the linear motor and the other safety switch are installed on the swing arm assembly, and a rotating shaft is arranged on the swing arm assembly and fixedly connected with a swash plate square shaft head of the mechanical HST in a matched mode. And a push rod of the linear motor drives the rotating shaft to rotate when acting. The swing angle of the swash plate square shaft head of the mechanical HST is changed by changing the telescopic position of the push rod of the linear motor with the position feedback function, the process action is smooth and free of impact, and the characteristics of telescopic position feedback, overload protection and the like are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to agricultural machinery technical field, concretely relates to a mechanical HST electric control speed change device. BACKGROUND

[0002] The mechanical HST commonly used in the existing agricultural machinery is a pump and motor integrated hydrostatic drive system assembly, which is generally a swash plate variable angle speed change mode and is composed of an input shaft, an input pump, an output shaft, an output motor, an input variable swash plate and an output fixed swash plate. The input shaft of the HST is a power source and is generally fixed in a rotational direction. The input variable swash plate of the HST has a middle position, a left swing range and a right swing range. When the input variable swash plate is in the middle position, the flow rate of the input pump is zero, the transmission speed of the output motor is also zero, and the output is in a stop state. When the input variable swash plate swings in the left swing range, the hydraulic flow rate of the input pump is changed, the transmission speed of the output shaft (motor) of the HST is changed through hydraulic transmission, and the output shaft rotates in a counterclockwise direction in this range. When the input variable swash plate swings in the right swing range, the hydraulic flow rate of the input pump is changed, the transmission speed of the output shaft (motor) of the HST is changed through hydraulic transmission, and the output shaft rotates in a clockwise direction in this range.

[0003] The input variable swash plate and the input shaft are rotating parts and are driven to rotate by a mechanical structure. The action process of the conventional mechanical transmission structure is not smooth enough, the control of the rotating range is not accurate enough, and there is a lack of certain safety limiting function, which affects the speed change function of the mechanical HST. Therefore, the utility model improves the existing mechanical structure by electrical control and proposes a mechanical HST electric control speed change device, which realizes the speed change function of electrical control and meets the design requirements of intelligent and unmanned driving of modern agricultural machinery. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to solve at least one of the technical problems in the prior art. Therefore, the purpose of the utility model is to provide a mechanical HST electric control speed change device, which solves the problems of

[0005] .

[0006] The utility model is implemented by the following technical solutions:

[0007] A mechanical HST electric control gear device, comprising a controller, an angle sensor, two safety switches, a driver, a linear motor, a steering assembly and a swing arm assembly, the bottom of the steering assembly is fixed on a machine body, the bottom of the swing arm assembly is fixed on a housing of a gear box, the angle sensor and the two safety switches are electrically connected with the controller, the controller, the driver and the linear motor are electrically connected in sequence, the angle sensor and one of the safety switches are installed on the steering assembly and are driven to move when the steering assembly is actuated, the linear motor and the other safety switch are installed on the swing arm assembly, the swing arm assembly is provided with a rotating shaft and is fixedly connected with a swash plate square shaft head of a mechanical HST, and the rotating shaft is driven to rotate when a push rod of the linear motor is actuated.

[0008] Preferably, the steering assembly comprises a handle mounting seat, an operating handle, a swing tooth plate, a first shaft sleeve, a short hinge plate, a long hinge plate and a spring plate, the bottom of the handle mounting seat is fixed on the machine body, the top of the handle mounting seat is provided with an assembly shaft head and is provided with a first mounting hole, a second mounting hole and an arc-shaped groove in a matched manner, the waist of the handle mounting seat is fixed with the spring plate, the angle sensor is installed on the handle mounting seat and an input shaft thereof passes through the first mounting hole, the top of the swing tooth plate is configured as a U-shaped structure and is provided with a pin shaft head, the bottom of the swing tooth plate is configured as a toothed structure, the middle part of the swing tooth plate is provided with a shaft sleeve part and a pit in a matched manner, the assembly shaft head is sleeved into the shaft sleeve part through the first shaft sleeve, the operating handle is fixed between the U-shaped structures, the toothed structure is provided in a matched manner with a coiled part of the spring plate, the pit is a hole single-side groove structure, a contact end of the first safety switch (17) passes through the second mounting hole and forms a contact point with the groove, one end of the long hinge plate is hingedly connected to the pin shaft head and is axially limited by a split pin, the other end of the long hinge plate is hingedly connected to one end of the short hinge plate, the hingedly connected points are connected by bolts and the bolts can move in the arc-shaped groove, the other end of the short hinge plate is hingedly connected to the input shaft of the angle sensor.

[0009] More preferably, the head of the input shaft of the angle sensor is configured as a semicircular structure, and a semicircular hole is provided in a matched manner on one end of the short hinge plate hingedly connected with the input shaft.

[0010] Preferably, the swing arm assembly includes a swing arm plate mounting seat, an arm plate, a second bushing, and a square sleeve shaft. The bottom side of the swing arm plate mounting seat is fixed to the housing of the gearbox. The linear motor is mounted on the top of the swing arm plate mounting seat. The swing arm plate mounting seat has a third mounting hole and a bushing hole. The third mounting hole and the bushing hole are located on a vertical straight line. The shaft of the square sleeve shaft is fitted into the bushing hole through the second bushing. Its shaft end face is fixed to the bottom end of the arm plate. The top of the arm plate is hinged to the push rod of the linear motor and is axially limited by a pin and a cotter pin. The middle part of the arm plate is provided with a recessed structure. The recessed structure is a single-sided bevel structure. After the contact end of the second safety switch (18) passes through the third mounting hole, it forms a contact engagement with the bevel. The connecting part of the square sleeve shaft is engaged with the swashplate square shaft head of the mechanical HST and forms a fixed connection.

[0011] Preferably, the connecting part of the square sleeve shaft is an open structure with threaded hole locking structures on both sides. The swash plate square shaft head contains an annular groove structure, which is assembled with the above-mentioned open structure. The square connecting part and the swash plate square shaft head are fixedly connected by screws passing through the above-mentioned threaded hole locking structures. The shaft end face of the square sleeve shaft is provided with a central threaded hole and a set of pin holes. The bottom end of the arm plate is provided with a corresponding central threaded hole and a set of pin holes. The pin holes of the square sleeve shaft and the corresponding pin holes of the arm plate are fixed by limiting cylindrical pins. Afterwards, the central threaded hole of the square sleeve shaft and the central threaded hole of the arm plate are fixed by a large washer, an elastic washer and a bolt.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model achieves the change of the swing angle of the swashplate square shaft head of the mechanical HST by changing the extension and retraction position of the push rod of a linear motor with position feedback. The process is smooth and shock-free, and features extension and retraction position feedback and overload protection. The overall design is simple, requires minimal modification to the mechanical structure, and is low in cost, economical, and highly practical.

[0014] 2. This utility model has an HST mid-position safety protection function. Subsequent operation can only be started normally when the square shaft head of the swashplate is in the zero position (middle position). This mid-position safety protection function uses two sets of contact safety switch signal acquisition, which has the characteristics of high safety and reliability.

[0015] 3. The electrical control part of this utility model adopts a push-button switch and a controller through CAN communication function, which has the characteristics of small response delay, low current of electrical control system and low energy consumption. It can also be applied to the speed control of hydraulic variable speed adjustment swashplate type HST, where only the linear motor push rod needs to be omitted, which has the characteristics of compatibility. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the mechanical HST electronically controlled speed change device of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the control component of this utility model;

[0019] Figure 3 This is an assembly drawing of the control component of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the swing tooth plate and the spring plate of this utility model.

[0021] Figure 5 A schematic diagram of the structure of the short hinge plate of this utility model, which has a semi-circular hole at one end;

[0022] Figure 6 This is an assembly drawing of the swing arm assembly of this utility model;

[0023] Figure 7 This is a side view of the swing arm assembly of this utility model.

[0024] Figure 8 This is a three-dimensional structural diagram of the square sleeve rotating shaft of this utility model;

[0025] Figure 9 This is a rear view of the square sleeve pivot of this utility model;

[0026] Figure 10 This is a top view of the slanted square shaft head on the mechanical HST of this utility model.

[0027] The components include: controller 1, angle sensor 2, input shaft 201, driver 3, linear motor 4, push rod 401, operating assembly 5, handle mounting base 501, assembly shaft head 5011, first mounting hole 5012, second mounting hole 5013, arc groove 5014, operating handle 502, swing tooth plate 503, pin head 5031, bushing part 5032, recess 5033, first bushing 504, short hinge plate 505, semi-circular hole 5051, long hinge plate 506, spring plate 507, rolled part 5071, swing arm assembly 6, swing arm plate mounting base 601, third mounting hole 6011, bushing hole 6012, arm plate 602, recess structure 6021, second bushing 603, square sleeve rotating shaft 604, shaft part 6041, square connecting part 6042, and mechanical HST. 7. Swashplate square shaft head 701, cotter pin 8, bolt 9, pin 10, screw 11, center threaded hole 12, pin hole 13, limit cylindrical pin 14, large washer 15, elastic washer 16, first safety switch 17, second safety switch 18, open structure a, annular groove structure b, threaded hole locking structure c. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0029] The technical solution of this utility model will be further described below with reference to the accompanying drawings. Figures 1-10A mechanical HST electronically controlled transmission device is shown, comprising: a controller 1, an angle sensor 2, two safety switches (first safety switch 17 and second safety switch 18), a driver 3, a linear motor 4, an operating assembly 5, and a swing arm assembly 6. The bottom of the operating assembly 5 is fixed to the machine body, and the bottom of the swing arm assembly 6 is fixed to the housing of the gearbox. The angle sensor 2 and the two safety switches are electrically connected to the controller 1. The controller 1, driver 3, and linear motor 4 are electrically connected in sequence. The angle sensor 2 and one of the safety switches are mounted on the operating assembly 5. When the operating assembly 5 is moved, it will drive its movement. The linear motor 4 and the other safety switch are mounted on the swing arm assembly 6. The swing arm assembly 6 has a rotating shaft that is fixedly connected to the swashplate square shaft head 701 of the mechanical HST 7. When the push rod 401 of the linear motor 4 is actuated, it drives the aforementioned rotating shaft to rotate. The sway angle of the swashplate square shaft head 701 of the mechanical HST 7 is changed by changing the extension and retraction position of the push rod of the linear motor 4 with position feedback. The process is smooth and shock-free, and features extension and retraction position feedback and overload protection.

[0030] The control assembly 5 includes a handle mounting base 501, an operating handle 502, a swing gear plate 503, a first bushing 504, a short hinge plate 505, a long hinge plate 506, and a spring plate 507. The bottom of the handle mounting base 501 is fixed to the machine body. The top of the handle mounting base 501 is provided with an assembly shaft head 5011, and is provided with a first mounting hole 5012, a second mounting hole 5013, and an arc-shaped groove 5014. The waist of the handle mounting base 501 is fixed with the spring plate 507. Angle sensor 2 is mounted on the handle mounting base 501, and its input shaft 201 passes through the first mounting hole 5012. The top of the swing gear plate 503 has a U-shaped structure and is provided with a pin head. 5031, the bottom structure of the swing tooth plate 503 is a toothed structure. The middle part of the swing tooth plate 503 is provided with a bushing part 5032 and a recess 5033. The mounting shaft head 5011 is fitted into the bushing part 5032 through the first bushing 504. The operating handle 502 is fixed between the above-mentioned U-shaped structures. The toothed structure is matched with the rolled part 5071 of the spring plate 507. The recess 5033 is a single-sided bevel structure. After the contact end of the first safety switch 17 passes through the second mounting hole 5013, it forms a contact with the bevel. When the contact point leaves the recess, no signal is generated or another signal is generated. Whether a signal is generated or not is related to the model of the touch safety switch. One end of the long hinge plate 506 is hinged to the pin head 5031 and axially limited by the cotter pin 8. The other end is hinged to one end of the short hinge plate 505. The hinge point here is connected by a bolt 9 and the bolt 9 can move in the arc groove 5014. The other end of the short hinge plate 505 is hinged to the input shaft 201 of the angle sensor 2.

[0031] To make the connection between the angle sensor 2 and the short hinge plate 505 more secure, preferably, the head of the input shaft 201 of the angle sensor 2 is constructed as a semi-circular structure, and a semi-circular hole 5051 is provided on the end of the short hinge plate 505 that is hinged to the input shaft 201.

[0032] The swing arm assembly 6 includes a swing arm plate mounting base 601, an arm plate 602, a second bushing 603, and a square sleeve shaft 604. The bottom side of the swing arm plate mounting base 601 is fixed to the housing of the gearbox. The linear motor 4 is mounted on the top of the swing arm plate mounting base 601 and is axially limited by a pin, a flat washer, and a cotter pin. The swing arm plate mounting base 601 has a third mounting hole 6011 and a bushing hole 6012. The third mounting hole 6011 and the bushing hole 6012 are located on a vertical straight line. The shaft part 6041 of the square sleeve shaft 604 is fitted into the bushing hole 6012 through the second bushing 603. Its shaft end face is fixed to the bottom end of the arm plate 602. The top end of the arm plate 602 is hinged to the push rod 401 of the linear motor 4 and is axially limited by the pin 10 and the cotter pin 8. The middle part of the arm plate 602 is provided with a recess structure 6021. The recess structure 6021 is a single-sided bevel structure. After the contact end of the second safety switch 18 passes through the third mounting hole 6011, it forms a contact engagement with the bevel. The square connecting part 6042 of the square sleeve shaft 604 is engaged with the swashplate square shaft head 701 of the mechanical HST 7 and forms a fixed connection.

[0033] The square connecting part 6042 of the square sleeve shaft 604 is an open structure a, with threaded hole locking structures c on both sides. The swash plate square shaft head 701 contains an annular groove structure b, which is assembled with the above-mentioned open structure a. The square connecting part 6042 and the swash plate square shaft head 701 are fixedly connected by screws 11 passing through the above-mentioned threaded hole locking structures c. The shaft part 6041 of the square sleeve shaft 604 has a central threaded hole 12 and a set of pin holes 13 on its end face. The bottom end of the arm plate 602 has a corresponding central threaded hole 12 and a set of pin holes 13. The pin holes 13 of the square sleeve shaft 604 and the corresponding pin holes 13 of the arm plate are fixed by limiting cylindrical pins 14. After fixing, the central threaded hole 12 of the square sleeve shaft 604 and the central threaded hole 12 of the arm plate 602 are fixed by large washers 15, elastic washers 16 and bolts 9.

[0034] It is worth mentioning that,

[0035] The working principle of this utility model:

[0036] The controller 1, angle sensor 2, safety switch, driver 3, and linear motor 4 constitute the electronically controlled drive unit. These components are electrically connected via electrical wiring harnesses. The electronically controlled drive unit is the control action execution unit, employing a distributed arrangement. They can be directly connected in parallel to the overall machine's electrical wiring harness. The controller 1 is the component for information collection and processing. The linear motor 4, with position feedback, is the action execution component. The driver 3 controls and drives the motor, amplifying its power. The safety switch is a touch-sensitive switch; its end contacts exhibit two states—signal and no signal—in the touched and free states. Its function is to provide a fixed starting position signal, ensuring that the extension and retraction length of the linear motor 4's push rod, acting on the swing arm assembly 6, is in a safe position, preventing accidents. The operation of the control component 5 is signal-acquired by the angle sensor 2. The middle position of the control handle 502 is signal-acquired through the first safety switch 17. The signal is transmitted to the controller 1, and the driver 3 controls the operation of the linear motor 4. The push rod of the linear motor 4 acts on the arm plate 602 in the swing arm assembly 6 and changes its angle position, ultimately realizing the swing angle change of the swashplate square shaft head 701 of the mechanical HST 7, that is, realizing the speed change function.

[0037] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanical HST electronically controlled transmission device, characterized in that: The system includes: a controller (1), an angle sensor (2), two safety switches, a driver (3), a linear motor (4), a control assembly (5), and a swing arm assembly (6). The bottom of the control assembly (5) is fixed to the machine body, and the bottom of the swing arm assembly (6) is fixed to the housing of the gearbox. The angle sensor (2) and the two safety switches are electrically connected to the controller. The controller (1), the driver (3), and the linear motor (4) are electrically connected in sequence. The angle sensor (2) and one of the safety switches are installed on the control assembly (5). When the control assembly (5) is moved, it will drive the operation. The linear motor (4) and the other safety switch are installed on the swing arm assembly (6). The swing arm assembly (6) has a rotating shaft and is fixedly connected to the swashplate square shaft head (701) of the mechanical HST (7). When the push rod (401) of the linear motor (4) is activated, it drives the rotating shaft to rotate.

2. The mechanical HST electronically controlled transmission device according to claim 1, characterized in that: The control assembly (5) includes a handle mounting base (501), an operating handle (502), a swing gear plate (503), a first bushing (504), a short hinge plate (505), a long hinge plate (506), and a spring plate (507). The bottom of the handle mounting base (501) is fixed to the machine body, and the top of the handle mounting base (501) is provided with an assembly shaft head (5011), and is provided with a first mounting hole (5012) and a second mounting hole (5013). 013) and arc groove (5014), the waist of the handle mounting base (501) is fixed with a spring plate (507), the angle sensor (2) is mounted on the handle mounting base (501), its input shaft (201) passes through the first mounting hole (5012), the top of the swing tooth plate (503) is U-shaped and has a pin head (5031), the bottom of the swing tooth plate (503) is toothed, the swing tooth plate (503) The middle part of the shaft is provided with a bushing part (5032) and a recess (5033). The assembly shaft head (5011) is fitted into the bushing part (5032) through the first bushing (504). The operating handle (502) is fixed between the above-mentioned U-shaped structures. The toothed structure is configured to cooperate with the rolled part (5071) of the spring plate (507). The recess (5033) is a single-sided bevel structure, through which the contact end of the first safety switch (17) passes through the second mounting hole. (5013) then forms a contact point with the above-mentioned bevel. One end of the long hinge plate (506) is hinged to the pin head (5031) and axially limited by the cotter pin (8). The other end is hinged to one end of the short hinge plate (505). The hinge point here is connected by a bolt (9) and the bolt (9) can move in the arc groove (5014). The other end of the short hinge plate (505) is hinged to the input shaft (201) of the angle sensor (2).

3. The mechanical HST electronically controlled transmission device according to claim 2, characterized in that: The head of the input shaft (201) of the angle sensor (2) is constructed as a semi-circular structure, and a semi-circular hole (5051) is provided on the end of the short hinge plate (505) that is hinged to the input shaft (201).

4. The mechanical HST electronically controlled transmission device according to claim 1, characterized in that: The swing arm assembly (6) includes a swing arm plate mounting base (601), an arm plate (602), a second bushing (603), and a square sleeve rotating shaft (604). The bottom side of the swing arm plate mounting base (601) is fixed to the housing of the gearbox. The linear motor (4) is mounted on the top of the swing arm plate mounting base (601). The swing arm plate mounting base (601) has a third mounting hole (6011) and a bushing hole (6012). The third mounting hole (6011) and the bushing hole (6012) are located on a vertical straight line. The shaft portion (6041) of the square sleeve rotating shaft (604) is fitted into the bushing hole (6012) through the second bushing (603). The shaft end face is fixed to the bottom end of the arm plate (602). The top end of the arm plate (602) is hinged to the push rod (401) of the linear motor (4) and is axially limited by the pin (10) and the cotter pin (8). The middle part of the arm plate (602) is provided with a recess structure (6021). The recess structure (6021) is a single-sided bevel structure. After the contact end of the second safety switch (18) passes through the third mounting hole (6011), it forms a contact point with the bevel. The square connecting part (6042) of the square sleeve shaft (604) is fitted with the swash plate square shaft head (701) of the mechanical HST (7) and forms a fixed connection.

5. The mechanical HST electronically controlled transmission device according to claim 4, characterized in that: The square connecting part (6042) of the square sleeve shaft (604) is an open structure a, with threaded hole locking structures c on both sides. The slanted square shaft head (701) contains an annular groove structure b, which is assembled with the open structure a. A screw (11) is used to pass through the threaded hole locking structure c to fix the square connecting part (6042) and the slanted square shaft head (701). A central threaded hole (12) and a central threaded hole (12) are provided on the end face of the shaft part (6041) of the square sleeve shaft (604). A set of pin holes (13) are provided. The bottom end of the arm plate (602) is provided with a central threaded hole (12) and a set of pin holes (13). The pin holes (13) of the square sleeve shaft (604) and the corresponding pin holes (13) of the arm plate are fixed by a limiting cylindrical pin (14). After that, the central threaded hole (12) of the square sleeve shaft (604) and the central threaded hole (12) of the arm plate (602) are fixed by a large washer (15), an elastic washer (16) and a bolt (9).

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