Speed change control device and tractor

Abstract

The invention relates to the technical field of tractors, and discloses a variable-speed control device and a tractor. The variable-speed control device comprises a shell assembly, a variable-speed transmission assembly and a variable-speed transmission assembly, the lower operating rod support assembly is arranged on the shell assembly, a spherical cavity is formed in the lower operating rod support assembly, and the spherical cavity is communicated with the operating cavity; the lower operating rod comprises an upper rod part, a spherical surface part and a lower rod part which are arranged in sequence, the spherical surface part is arranged in the spherical cavity and movably matched with the spherical cavity, the upper rod part extends out of one end of the spherical cavity, and the lower rod part extends into the operating cavity from the other end of the spherical cavity; and the auxiliary limiting elastic piece is used for assisting limiting elastic force to act between the lower operating rod and the lower operating rod support assembly or the shell assembly, so that the spherical surface part elastically abuts against the cavity wall on one side of the spherical cavity. According to the variable speed control device and the tractor, the auxiliary limiting elastic piece is additionally arranged, so that the control reliability can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of tractors, and in particular relates to a speed control device and a tractor. Background Art

[0002] The function of the main and auxiliary speed control devices of tractors is to control the meshing state of different gears in each gear of the gearbox to achieve different vehicle speeds. At present, the main and auxiliary speed control of tractor products in my country mostly adopts the center shift mechanism, and its operating lever is arranged on the upper cover of the transmission box in front of the driver's seat, located between the legs of the driver, which occupies a large space, is inconvenient for the driver to get on and off the vehicle, and has poor operating comfort. The main and auxiliary speed control levers of some models are distributed on the left and right sides of the driver, which causes many inconveniences for shifting gears. In order to ensure the comfort and convenience of operation, tractors mostly use side-mounted speed control mechanisms, but the space connecting rods of the side-mounted speed control mechanisms are prone to large shaking, which will have an adverse effect on the reliability of operation. Summary of the invention

[0003] The purpose of the present application is to provide a speed control device and a tractor, which are beneficial to improving the reliability of control.

[0004] In order to achieve the above-mentioned object, the present application provides a speed shift operating device on one hand, the speed shift operating device comprising:

[0005] A housing assembly having an operating chamber therein;

[0006] A lower operating rod support assembly is arranged on the housing assembly, and the lower operating rod support assembly is formed with a spherical cavity, and the spherical cavity is communicated with the operating cavity;

[0007] A lower operating rod, comprising an upper rod portion, a spherical portion and a lower rod portion which are arranged in sequence, wherein the spherical portion is built into the spherical cavity and movably cooperates with the spherical cavity, the upper rod portion extends from one end of the spherical cavity, and the lower rod portion extends into the operating cavity from the other end of the spherical cavity;

[0008] An auxiliary limiting elastic member, wherein the elastic force of the auxiliary limiting elastic member acts between the lower operating rod and the lower operating rod support assembly or the housing assembly to elastically press the spherical portion against a side cavity wall of the spherical cavity.

[0009] In some specific embodiments, the elastic member is a spring sleeved on the upper rod portion or the lower rod portion.

[0010] In some specific embodiments, a limiting member is provided on the lower operating rod, one end of the auxiliary limiting elastic member presses against the limiting member, and the other end presses against the lower operating rod support assembly or the housing assembly.

[0011] In some specific embodiments, the limiting member is a fixed retaining ring member fixedly mounted on the lower rod portion, an annular sinker is provided at one end of the lower operating rod support assembly relatively close to the lower rod portion, and the elastic member is pressed between the annular sinker and the limiting member.

[0012] In some specific embodiments, the lower joystick support assembly includes:

[0013] a stopper sleeve, in which the upper cavity portion of the spherical cavity is formed;

[0014] A support body is fixed on the housing assembly, the annular sink is arranged on the support body, the lower cavity of the spherical cavity is formed in the support body, the support body is provided with a stopper sleeve accommodating cavity, the upper portion of the stopper sleeve accommodating cavity is open and communicates with the lower cavity of the spherical cavity, and the stopper sleeve is arranged in the stopper sleeve accommodating cavity;

[0015] The retaining ring, the upper rod portion is sequentially inserted into the retaining sleeve and the retaining ring from bottom to top, and the retaining ring is clamped on the cavity wall of the retaining sleeve accommodating cavity to fix the retaining sleeve on the support body.

[0016] In some specific embodiments, the speed shift operating device includes a main speed shift operating lever and a sub-speed shift operating lever, the number of the lower operating levers is provided with two and the two lower operating levers correspond to the main speed shift lower operating lever and the sub-speed shift lower operating lever, the main speed shift lower operating lever is connected to the main speed shift operating lever, the sub-speed shift lower operating lever is connected to the sub-speed shift operating lever, and at least one of the main speed shift lower operating lever and the sub-speed shift lower operating lever is provided with the auxiliary limiting elastic member.

[0017] In some specific embodiments, the speed shift operating device also includes a main speed transfer rod and a main speed outer shift head both located in the operating cavity, the main speed outer shift head is fixedly disposed on the main speed transfer rod, the lower rod portion of the main speed lower operating rod is transmission connected to the main speed outer shift head so as to drive the main speed transfer rod to rotate, and a neutral detection unit is provided between the main speed transfer rod and the housing assembly, and the neutral detection unit can detect whether the main speed transfer rod is in a neutral state position.

[0018] In some specific embodiments, the neutral detection unit includes:

[0019] A neutral switch toggle head is fixedly arranged on the main transmission lever and rotates synchronously with the main transmission lever, and a card slot is provided on the outer periphery of the neutral switch toggle head;

[0020] The sensor is arranged on the housing assembly, the induction head of the sensor is movably matched with the card slot, and can send out a neutral signal when the main gear transmission lever is in a neutral state position.

[0021] In some specific embodiments, the speed shift operating device further includes a neutral state display unit, which is communicatively connected to the neutral detection unit and can display a corresponding prompt signal according to a neutral signal of the neutral detection unit.

[0022] A second aspect of the present application provides a tractor comprising the above-mentioned speed shift control device.

[0023] Through the above technical solution, since an auxiliary limiting elastic member is added between the lower operating lever support assembly or the housing assembly and the lower operating lever, the spherical portion of the lower operating lever can be pressed against the side cavity wall of the spherical cavity under the elastic force of the elastic member, thereby ensuring that the operating components are tightly combined, effectively avoiding the shaking of the main and auxiliary speed change operating levers caused by the gap between the lower operating lever and the lower operating lever support assembly, the outer shift head and other components, thereby improving the reliability of operation and the comfort of the driver.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0026] Figure 1 A cross-sectional view of a speed shift operating device according to a specific embodiment of the present application is shown;

[0027] Figure 2 for Figure 1 A schematic diagram of the partial structure of the speed change control device;

[0028] Figure 3 for Figure 1 A cross-sectional view from another perspective of the speed shift control device.

[0029] Description of Reference Numerals

[0030] 1 Main speed change handle ball 2 Secondary speed change handle ball

[0031] 3 Main speed levers 4 Sub-speed levers

[0032] 5 Dust cover 6 Main gear lower lever

[0033] 61 upper shaft 62 ball portion

[0034] 63 lower rod 7 retaining ring

[0035] 8-stop sleeve 9-support body

[0036] 10 auxiliary limiting elastic member 11 limiting member

[0037] 12 Main speed outer shifter 13 Secondary speed lower lever

[0038] 14 gear shift outer shift head 15 housing assembly

[0039] 16 pairs of speed control levers 17 limit plates

[0040] 18 Main speed shift operating force dial 19 First return spring

[0041] 20 Neutral status display unit 21 Connection harness

[0042] 22 sensor 23 neutral switch dial

[0043] 25 second return spring 26 auxiliary speed change transmission rod

[0044] 27 Main gear transfer lever DETAILED DESCRIPTION

[0045] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0046] The spatial connection rod of the side-mounted speed control device is prone to large shaking, which will have an adverse effect on the reliability and comfort of the operation. In the prior art, the matching accuracy between the components is often improved by further improving the processing accuracy of the processing technology, thereby reducing the shaking of the spatial connection rod. However, this method will greatly increase the manufacturing cost of the side-mounted speed control device and reduce the cost performance of the tractor.

[0047] In view of this, if Figure 1 , Figure 2 and Figure 3As shown, the first aspect of the present application provides a speed control device, which includes a housing assembly 15, a lower operating rod support assembly, a lower operating rod and an auxiliary limiting elastic member 10. The housing assembly 15 is provided with an operating chamber, the lower operating rod support assembly is arranged on the housing assembly 15, and the lower operating rod support assembly forms a spherical chamber, which is connected to the operating chamber. The lower operating rod includes an upper rod portion 61, a spherical portion 62 and a lower rod portion 63 arranged in sequence, the spherical portion 62 is built into the spherical chamber and movably cooperates with the spherical chamber, the upper rod portion 61 extends from one end of the spherical chamber, and the lower rod portion 63 extends into the operating chamber from the other end of the spherical chamber. The elastic force of the auxiliary limiting elastic member 10 acts between the lower operating rod and the lower operating rod support assembly or the housing assembly 15, so as to elastically press the spherical portion 62 against a side wall of the spherical chamber.

[0048] It can be seen that in the speed control device, the spherical portion 62 of the lower joystick cooperates with the spherical cavity of the lower joystick support assembly to form a spatial linkage mechanism. However, due to the limitations of the processing technology and assembly design requirements of the spherical portion 62 of the lower joystick and the spherical cavity of the lower joystick support assembly, there will be a certain gap between the lower joystick and the lower joystick support assembly or other components, which may easily cause the joystick to shake, which is not conducive to improving the reliability and comfort of driving control.

[0049] In order to take into account both the reliability and comfort of driving control, reduce the precision requirements for parts and reduce unnecessary increase in manufacturing costs, the speed control device of the present application adds an auxiliary limit elastic member 10 between the lower control rod support assembly and the lower control rod, or between the housing assembly 15 and the lower control rod. One end of the auxiliary limit elastic member 10 elastically acts on the lower control rod support assembly or the housing assembly 15, and the other end can elastically act on the lower control rod, so that a force can be applied to the lower control rod toward one side, so that the spherical portion 62 presses against the side wall of the spherical cavity. In this way, the speed control device can effectively reduce the shaking of the control rod and improve the reliability and comfort of driving control. In addition, the manufacturing cost and processing and assembly cost of the auxiliary limit elastic member 10 are low, and will not increase the manufacturing and processing cost of the speed control device.

[0050] It should be noted that the structures and matching structures of the housing assembly 15, the lower joystick support assembly, the lower joystick and the auxiliary limiting elastic member 10 can be varied and can be designed according to actual application requirements. Structural forms that can achieve corresponding functions should also fall within the protection scope of this application.

[0051] For example, the housing assembly 15 and the lower joystick support assembly can be assembled from two or more parts, respectively. The spherical surface of the spherical portion 62 can also be provided with multiple functional structural grooves to achieve different functions, such as limit grooves, etc. The upper rod portion 61 of the lower joystick can be provided with different connection structures that can be fixedly connected to the joystick, and the lower rod portion 63 of the lower joystick can be provided with different connection structures that can be movably connected to the outer dial head. The auxiliary limit elastic member 10 can be a compression spring, a torsion spring, a leaf spring, etc.

[0052] In addition, according to the different types of auxiliary limiting elastic members 10 and the actual structures of the lower joystick support assembly and the housing assembly 15, the elastic action structures of the auxiliary limiting elastic member 10 between the lower joystick support assembly and the lower joystick, or between the housing assembly 15 and the lower joystick, can also be varied. One end of the auxiliary limiting elastic member 10 can be mortgaged on the upper rod portion 61, the spherical portion 62 or the lower rod portion 63, and the other end can be mortgaged on the limiting groove or limiting protrusion of the lower joystick support assembly or the housing assembly 15. Among them, when the lower joystick, the lower joystick support assembly and the housing assembly 15 are respectively integrally formed with limiting structures that can limit the ends of the auxiliary limiting elastic member 10, the two ends of the auxiliary limiting elastic member 10 can be directly pressed between the lower joystick and the lower joystick support assembly, or between the lower joystick and the housing assembly 15. Of course, the lower joystick, the lower joystick support assembly and the shell assembly 15 may also be fixedly equipped with corresponding limit members that can limit the auxiliary limit elastic member 10. The two ends of the auxiliary limit elastic member 10 can be indirectly pressed between the lower joystick and the lower joystick support assembly, or between the lower joystick and the shell assembly 15 through the limit members.

[0053] In some specific embodiments, since the spring is easily available, the production and assembly cost is low, such as Figure 1 and Figure 2 As shown, the auxiliary limiting elastic member 10 may be a spring sleeved on the upper rod portion 61 or the lower rod portion 63 .

[0054] Furthermore, in order to facilitate pressing the end of the auxiliary limiting elastic member 10 against the lower operating rod without increasing the manufacturing difficulty and cost of the lower operating rod, as shown in FIG. Figure 1 and Figure 2 As shown, a limit member 11 may be mounted on the lower operating lever, one end of the auxiliary limit elastic member 10 presses against the limit member 11 , and the other end presses against the lower operating lever support assembly or the housing assembly 15 .

[0055] Furthermore, the stopper 11 can be a fixed retaining ring member fixedly sleeved on the lower rod 63. An annular sink 91 is provided at one end of the lower operating rod support assembly relatively close to the lower rod 63, and the elastic member is pressed between the annular sink and the stopper 11. Specifically, Figure 1 and Figure 2As shown, an annular groove can be machined on the lower rod 63, and a fixed retaining ring can be sleeved on the lower rod 63 as a limiting member 11 and can be connected to the annular groove. In this way, the bottom end of the auxiliary limiting elastic member 10 can be pressed against the top surface of the limiting member 11, thereby realizing the bottom end limiting of the auxiliary limiting elastic member 10. The bottom end of the lower operating rod support assembly is provided with an annular sink 91 arranged in alignment with the limiting member 11. The annular sink 91 is in the shape of an annular groove. The lower rod 63 passes downward through the annular sink 91, and the top end of the auxiliary limiting elastic member 10 can be pressed against the annular sink 91, thereby realizing the top end limiting of the auxiliary limiting elastic member 10. At this time, the lower operating rod is subjected to the downward elastic force of the auxiliary limiting elastic member 10, and the spherical portion 62 is pressed against the upper cavity wall of the spherical cavity, reducing the axial movement of the lower operating rod.

[0056] In some specific embodiments, Figure 1 and Figure 2 As shown, the lower operating rod support assembly may include a stopper sleeve 8, a support body 9 and a stopper ring 7. The lower cavity of the spherical cavity is formed in the support body 9, and the upper cavity of the spherical cavity is formed in the stopper sleeve 8, that is, the spherical cavity is defined between the stopper sleeve 8 and the support body 9. The support body 9 is fixedly mounted on the housing assembly 15 by bolts, and the top of the housing assembly 15 is provided with a top opening connected to the operating cavity, and the annular sink is arranged at the bottom of the support body 9 and is located below the spherical cavity. The spherical cavity, the annular sink and the top opening of the housing assembly 15 are connected in sequence, and the lower operating rod is sequentially inserted into the spherical cavity, the annular sink and the top opening of the housing assembly 15. The top of the support body 9 is also provided with a stopper sleeve accommodating cavity, the upper part of which is open and connected to the lower cavity of the spherical cavity, and the stopper sleeve 8 is arranged in the stopper sleeve accommodating cavity. The upper rod portion 61 is sequentially inserted into the stopper sleeve 8 and the stopper ring 7 from bottom to top, and a snap ring groove is provided on the cavity wall of the stopper sleeve accommodating cavity, and the stopper ring 7 is snapped into the snap ring groove on the cavity wall of the stopper sleeve accommodating cavity to fix the stopper sleeve 8 on the support body 9. In this way, the spherical portion of the lower operating rod can be installed in the spherical cavity of the lower operating rod support assembly.

[0057] Optionally, the speed control device may include a main speed control lever 3 and a sub-speed control lever 4, and the number of the lower control levers is two and the two lower control levers correspond to the main speed lower control lever 6 and the sub-speed lower control lever 13. The main speed lower control lever 6 is fixedly connected to the main speed control lever 3, and the sub-speed lower control lever 13 is fixedly connected to the sub-speed control lever 4. At least one of the main speed lower control lever 6 and the sub-speed lower control lever 13 is provided with an auxiliary limiting elastic member, so that the shaking between the main speed lower control lever 6 and the sub-speed lower control lever 13 and other components can be reduced, and the operating reliability and comfort are better.

[0058] Specifically, Figure 1 and Figure 2As shown, the number of lower operating lever support assemblies is corresponding to two, and the two lower operating lever support assemblies are respectively fixedly mounted on the housing assembly 15. The main gear lower operating lever 6 is arranged on one of the lower operating lever support assemblies, and the auxiliary gear lower operating lever 13 is arranged on the other lower operating lever support assembly. The lower rod portion 63 of the main gear lower operating lever 6 and the lower rod portion 63 of the auxiliary gear lower operating lever 13 are respectively provided with a limiter 11, and are respectively sleeved with an auxiliary limiter elastic member 10, and the two ends of the two auxiliary limiter elastic members 10 are pressed against the corresponding limiter 11 and the annular sink at the bottom of the support body 9.

[0059] Alternatively, if Figure 1 and Figure 2 As shown, the speed shifting device further includes a main speed shifting handle ball 1, a sub-speed shifting handle ball 2 and two dust covers 5. The main speed shifting handle ball 1 is arranged on the top of the main speed shifting lever 3, and the sub-speed shifting handle ball 2 is arranged on the top of the sub-speed shifting lever 4. The two dust covers 5 are respectively arranged on the tops of the two support bodies 9, and the upper rod portion 61 of the main speed shifting lower lever 6 and the upper rod portion 61 of the sub-speed shifting lower lever 13 pass through the dust covers 5 to be connected to the main speed shifting lever 3 and the sub-speed shifting lever 4 respectively.

[0060] Optionally, the speed control device further includes a limit plate 17 and a main speed outer shift head 12, a sub-speed outer shift head 14, a sub-speed operating force head 16, a main speed operating force head 18, a first return spring 19, a second return spring 25, a sub-speed transmission rod 26 and a main speed transmission rod 27 in the control chamber. The sub-speed operating force head 16 and the main speed operating force head 18 are inserted into the limit plate 17 for limiting. The main speed outer shift head 12 is fixedly arranged on the main speed transmission rod 27, and the lower rod portion 63 of the main speed lower operating rod 6 is transmission-connected with the main speed outer shift head 12 to drive the main speed transmission rod 27 to rotate.

[0061] Specifically, Figure 1 and Figure 2 As shown, the main gear shift outer shift head 12 is movably connected to the lower rod portion 63 of the main gear shift lower operating lever 6 and can swing with the main gear shift lower operating lever 6. The first return spring 19 is sleeved on the main gear shift transmission rod 27, and the main gear shift transmission rod 27 is fixedly connected to the main gear shift outer shift head 12 and can rotate with the swing of the main gear shift outer shift head 12. The main gear shift operating force shift head 18 is fixedly arranged on the main gear shift transmission rod 27 and can move with the rotation of the main gear shift transmission rod 27, thereby transmitting the operating force.

[0062] Likewise, if Figure 1 and Figure 2As shown, the auxiliary transmission outer shift head 14 is movably connected to the lower rod portion 63 of the auxiliary transmission lower operating rod 13, and can swing with the auxiliary transmission lower operating rod 13. The second return spring 25 is sleeved on the auxiliary transmission transmission rod 26, and the auxiliary transmission transmission rod 26 is fixedly connected to the auxiliary transmission outer shift head 14 and can rotate with the swing of the auxiliary transmission outer shift head 14. The auxiliary transmission operating force shift head 16 is fixedly set on the auxiliary transmission transmission rod 26, and can move with the rotation of the auxiliary transmission transmission rod 26, so as to transmit the operating force.

[0063] During the use of the tractor, the operator often starts the tractor in the working gear. When starting the tractor in the working gear, the starter bears additional burden. Doing so for a long time may cause premature damage to the starter and accelerate the wear of the engine, clutch and other parts, affecting their service life. In addition, the parking brake will be subjected to additional friction, causing wear or damage. Moreover, when starting the tractor in the working gear, the tractor may suddenly rush forward, especially on steep slopes or slippery roads, which may cause the tractor to lose control and cause a safety accident.

[0064] Therefore, in order to further increase the reliability and safety of tractor operation, in some specific embodiments, a neutral detection unit may be provided between the main transmission lever 27 and the housing assembly 15, and the neutral detection unit can detect whether the main transmission lever 27 is in the neutral state position. In this way, the driver can always see the gear information of the vehicle, avoid starting the vehicle in the working gear, and improve the reliability and safety of operation.

[0065] The neutral detection unit may have various structural forms, for example, using components such as a travel switch, a micro switch or a proximity switch to detect whether the main gear transmission lever 27 is in the neutral state position.

[0066] Alternatively, if Figure 2 and Figure 3 As shown, the neutral detection unit may include a neutral switch head 23 and a sensor 22. The neutral switch head 23 is fixedly arranged on the main transmission lever 27 and rotates synchronously with the main transmission lever 27. A card slot is provided on the outer periphery of the neutral switch head 23. The sensor 22 is arranged on the housing assembly 15, and the sensing head of the sensor 22 is movably matched with the card slot. When the main transmission lever 27 is in the neutral state position, the sensing head of the sensor 22 is in a compressed state and sends out a neutral signal; when the main transmission lever 27 rotates and leaves the neutral state position, the sensing head of the sensor 22 is in a released state and can send out a working gear signal.

[0067] Alternatively, if Figure 3As shown, the speed control device may further include a neutral state display unit 20, which is in communication with the neutral detection unit and can display a corresponding prompt signal according to the neutral signal of the neutral detection unit. The neutral state display unit 20 may be a control panel, a display screen, or a light display.

[0068] It should be noted that the structural principles of the sensor 22 and the neutral state display unit 20 are well known to those skilled in the art, and do not belong to the core improvement part of the present application, so they will not be described here in detail.

[0069] The structure and working principle of the speed shift operating device of the present application will be briefly described below.

[0070] The driver moves the main gear lever 1 to drive the main gear lever 3 and the main gear lower lever 6 to move. The main gear lower lever 6 is connected to the main gear outer dial 12. The main gear outer dial 12 moves with the main gear lower lever 6. The main gear transmission rod 27 moves with the main gear outer dial 12, and drives the neutral switch dial 23 and the main gear operating force dial 18 to move. The main gear operating force dial 18 transmits the operating force. After the neutral switch dial 23 moves, the sensor 22 is moved, so that the signal is displayed on the neutral state display unit through the connecting harness 21 to remind the driver of the current gear information. Among them, the auxiliary limit elastic member 10 located on the main gear lower lever 6 can adjust the gap between the main gear lower lever 6 and the support body 9 and the main gear outer dial 12 at all times due to its own elastic force, ensuring that the above parts are in contact at all times and reducing the shaking of the main gear lever 3. In addition, the first return spring 19 can automatically return the main gearshift lever 3 to its original position when the gear is not engaged due to its own elastic force.

[0071] The driver moves the auxiliary speed-shift handle ball 2 to drive the auxiliary speed-shift lever 4 and the auxiliary speed-shift lower lever 13 to move. The auxiliary speed-shift lower lever 13 is connected to the auxiliary speed-shift outer dial head 14. The auxiliary speed-shift outer dial head 14 moves with the auxiliary speed-shift lower lever 13. The auxiliary speed-shift transmission rod 26 moves with the auxiliary speed-shift outer dial head 14 and drives the auxiliary speed-shift operating force dial head 16 to move. The auxiliary speed-shift operating force dial head 16 transmits the operating force. Among them, the auxiliary limit elastic member 10 located on the auxiliary speed-shift lower lever 13 can adjust the gap between the auxiliary speed-shift lower lever 13 and the support body 9 and the auxiliary speed-shift outer dial head 14 at all times due to its own elastic force, ensuring that the above parts are in contact at all times and reducing the shaking of the auxiliary speed-shift lever 4. In addition, the second reset spring 25 can automatically reset the auxiliary speed-shift lever 4 when the gear is not engaged due to its own elastic force.

[0072] The second aspect of the present application provides a tractor, the tractor comprising the above-mentioned speed shift control device. Since the tractor comprises the above-mentioned speed shift control device, it also has all the technical effects brought by the speed shift control device, so it will not be repeated.

[0073] In summary, the speed control device and tractor of the present application utilize the elasticity of the auxiliary limit elastic member 10 to ensure the tight combination of the control parts, which not only reduces the precision requirements for the parts, but also effectively avoids the shaking of the main and auxiliary speed control levers caused by the gap between the lower control lever and the lower control lever support, the outer shifter and other parts, thereby improving the reliability and comfort of the operation. In addition, by adding structures such as the neutral switch shifter and the sensor, the driver can always see the gear information of the vehicle, avoid starting the vehicle in the working gear, and improve the reliability and safety of the operation.

[0074] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A speed control device, characterized in that: include: A housing assembly (15) having an operating chamber therein; A lower operating rod support assembly is arranged on the housing assembly (15), the lower operating rod support assembly is formed with a spherical cavity, and the spherical cavity is communicated with the operating cavity; The lower operating rod comprises an upper rod portion (61), a spherical portion (62) and a lower rod portion (63) which are arranged in sequence, wherein the spherical portion (62) is built into the spherical cavity and movably cooperates with the spherical cavity, the upper rod portion (61) extends from one end of the spherical cavity, and the lower rod portion (63) extends into the operating cavity from the other end of the spherical cavity; An auxiliary limiting elastic member (10), wherein the elastic force of the auxiliary limiting elastic member (10) acts between the lower operating rod and the lower operating rod support assembly or the housing assembly (15) to press the spherical portion (62) against a side cavity wall of the spherical cavity.

2. The speed shift operating device according to claim 1, characterized in that: The auxiliary limiting elastic member (10) is a spring sleeved on the upper rod portion (61) or the lower rod portion (63).

3. The speed shift operating device according to claim 1, characterized in that: A limiting piece (11) is provided on the lower operating lever, one end of the auxiliary limiting elastic piece (10) presses against the limiting piece (11), and the other end presses against the lower operating lever support assembly or the housing assembly (15).

4. The speed shift operating device according to claim 3, characterized in that: The limiting member (11) is a fixed retaining ring member fixedly sleeved on the lower rod portion (63); an annular sinking platform (91) is provided at one end of the lower operating rod support assembly relatively close to the lower rod portion (63); and the elastic member is pressed between the annular sinking platform and the limiting member (11).

5. The speed shift operating device according to claim 4, characterized in that: The lower joystick support assembly comprises: A stopper sleeve (8), in which the upper cavity portion of the spherical cavity is formed; A support body (9) is fixed on the housing assembly (15), the lower cavity of the spherical cavity is formed in the support body (9), the support body (9) is provided with a stopper sleeve accommodating cavity, the upper portion of the stopper sleeve accommodating cavity is open and communicates with the lower cavity of the spherical cavity, the stopper sleeve (8) is arranged in the stopper sleeve accommodating cavity, and the annular sink is arranged on the support body (9); The retaining ring (7) is provided with the upper rod portion (61) being sequentially inserted into the retaining sleeve (8) and the retaining ring (7) from bottom to top, and the retaining ring (7) is clamped on the cavity wall of the retaining sleeve accommodating cavity to fix the retaining sleeve (8) on the support body (9).

6. The speed shift operating device according to claim 1, characterized in that: The speed shift operating device comprises a main speed shift operating lever (3) and a sub-speed shift operating lever (4); the number of the lower operating levers is two and the two lower operating levers correspond to the main speed shift lower operating lever (6) and the sub-speed shift lower operating lever (13); the main speed shift lower operating lever (6) is connected to the main speed shift operating lever (3), the sub-speed shift lower operating lever (13) is connected to the sub-speed shift operating lever (4); at least one of the main speed shift lower operating lever (6) and the sub-speed shift lower operating lever (13) is provided with the auxiliary limit elastic member.

7. The speed shift operating device according to claim 6, characterized in that: The speed shift operating device further comprises a main speed transmission rod (27) and a main speed outer shift head (12) both located in the operating chamber. The main speed outer shift head (12) is fixedly arranged on the main speed transmission rod (27). The lower rod portion (63) of the main speed lower operating rod (6) is in transmission connection with the main speed outer shift head (12) so as to be able to drive the main speed transmission rod (27) to rotate. A neutral gear detection unit is provided between the main speed transmission rod (27) and the housing assembly (15). The neutral gear detection unit is capable of detecting whether the main speed transmission rod (27) is in a neutral gear state position.

8. The speed shift operating device according to claim 7, characterized in that: The neutral detection unit comprises: A neutral switch dial (23) is fixedly arranged on the main speed transmission rod (27) and rotates synchronously with the main speed transmission rod (27); a clamping groove is provided on the outer periphery of the neutral switch dial (23); A sensor (22) is arranged on the housing assembly (15); a sensing head of the sensor (22) is movably matched with the slot and can send a neutral signal when the main gear transmission lever (27) is in a neutral state position.

9. The speed shift operating device according to claim 7, characterized in that: The speed shift operating device further comprises a neutral state display unit (20), which is communicatively connected with the neutral detection unit and can display a corresponding prompt signal according to a neutral signal of the neutral detection unit.

10. A tractor, characterized in that: A speed shift operating device comprising any one of claims 1-9.

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