CN110641279B - HST control mechanism and agricultural machine - Google Patents

HST control mechanism and agricultural machine Download PDF

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Publication number
CN110641279B
CN110641279B CN201911162875.0A CN201911162875A CN110641279B CN 110641279 B CN110641279 B CN 110641279B CN 201911162875 A CN201911162875 A CN 201911162875A CN 110641279 B CN110641279 B CN 110641279B
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China
Prior art keywords
driving
hst
swing arm
backward
mode
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CN201911162875.0A
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Chinese (zh)
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CN110641279A (en
Inventor
王桂民
于克港
李玉彪
刘然
陈福昌
王乐刚
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Lovol Heavy Industry Co Ltd
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Lovol Heavy Industry Co Ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K26/00Arrangements or mounting of propulsion unit control devices in vehicles
    • B60K26/02Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K20/00Arrangement or mounting of change-speed gearing control devices in vehicles
    • B60K20/02Arrangement or mounting of change-speed gearing control devices in vehicles of initiating means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K26/00Arrangements or mounting of propulsion unit control devices in vehicles
    • B60K26/04Arrangements or mounting of propulsion unit control devices in vehicles of means connecting initiating means or elements to propulsion unit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H59/00Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02Selector apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H63/00Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30Constructional features of the final output mechanisms

Abstract

The invention relates to an HST control mechanism and agricultural machinery, wherein the HST control mechanism comprises an HST displacement adjusting part, a gear shifting mechanism, a forward end swing arm, a backward end swing arm and a driving mechanism, the driving mechanism is hinged on a rack, the power end of the driving mechanism is connected with a foot accelerator through a foot accelerator pull wire, the first driving end of the driving mechanism is connected with an engine through an engine accelerator pull wire, the second driving end of the driving mechanism is respectively connected with the forward end swing arm and the backward end swing arm, the forward end swing arm and the backward end swing arm are respectively connected to the gear shifting mechanism and realize the switching between a forward mode and a backward mode through the gear shifting mechanism, and the gear shifting mechanism is connected with the HST displacement adjusting part; in the forward mode or the backward mode, the driving mechanism drives the engine throttle and simultaneously drives the forward end swing arm or the backward end swing arm to swing, so that the shifting mechanism synchronously acting with the forward end swing arm or the backward end swing arm pushes the HST displacement adjusting piece to increase or decrease the HST displacement.

Description

HST control mechanism and agricultural machine
Technical Field
The invention relates to the field of agricultural machinery, in particular to an HST control mechanism and agricultural machinery.
Background
At present, the prior agricultural machinery equipped with an HST (hydraulic continuously variable transmission) in China generally adopts a mode of manually controlling the HST discharge capacity, when walking operation is carried out, one hand is needed to control a handle to change the HST discharge capacity, the advancing speed of the whole machine is controlled, only one hand is needed to control a steering wheel, the direction stability is poor, and the walking operation route is easy to be S-shaped. Because the agricultural equipment needs to frequently adjust the operation speed during operation, the existing manual gear shifting control mode has high labor intensity of a manipulator and poor direction stability; in addition, when climbing a slope, crossing a ridge and getting on a truck, if the forward or backward speed needs to be changed midway, one hand is needed to operate the handle, the other hand is needed to control the steering wheel, the steering wheel is operated by one hand, the stability of the steering wheel is difficult to control, and the safety is not high.
Disclosure of Invention
The invention aims to solve the technical problem that the direction stability is poor due to the fact that the manual operation handle is commonly adopted by domestic agricultural machinery equipped with the HST to control the HST discharge capacity.
The technical scheme for solving the technical problems is as follows: an HST control mechanism comprises an HST displacement adjusting part, a gear shifting mechanism, a forward end swing arm, a backward end swing arm and a driving mechanism, wherein the driving mechanism is hinged to a rack, the power end of the driving mechanism is connected with a foot accelerator through a foot accelerator pull wire, the first driving end of the driving mechanism is connected with an engine through an engine accelerator pull wire, the second driving end of the driving mechanism is respectively connected with the forward end swing arm and the backward end swing arm, the forward end swing arm and the backward end swing arm are respectively connected to the gear shifting mechanism and realize switching between a forward mode and a backward mode through the gear shifting mechanism, and the gear shifting mechanism is connected with the HST displacement adjusting part; in the forward mode or the backward mode, the driving mechanism drives the engine throttle and simultaneously drives the forward end swing arm or the backward end swing arm to swing, so that the shifting mechanism synchronously acting with the driving mechanism pushes the HST displacement adjusting piece to increase or decrease the HST displacement.
The invention has the beneficial effects that: according to the HST control mechanism, the driving mechanism is respectively connected with the accelerator pull wire and the forward and backward swinging arm of the engine, when the accelerator pedal is trampled, the displacement of the accelerator of the engine and the displacement of the HST can be simultaneously increased or decreased, so that a handle rod is not frequently operated by hands during acceleration and deceleration, the labor intensity of a driver is greatly reduced, a steering wheel is guaranteed to be held by two hands during acceleration and deceleration, the S shape of an operation route is reduced, and the direction stability is improved; when climbing a slope, crossing a bank and getting on a truck, the steering wheel can be operated by two hands, and the safety is high.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the driving mechanism comprises a driving plate, a forward end connecting rod and a backward end connecting rod, the middle of the driving plate is hinged to the rack, the power end, the first driving end and the second driving end are respectively located on the driving plate, and the second driving end is respectively connected with the forward end swing arm and the backward end swing arm through the forward end connecting rod and the backward end connecting rod.
The beneficial effect of adopting the further scheme is that: the driving plate is matched with the connecting rod to drive the forward and backward swinging arms respectively, and the rotation angle of the driving plate can be controlled through a pull wire when the accelerator is stepped, so that the engine accelerator and the HST discharge capacity are increased simultaneously, and the increase of the vehicle speed is realized.
Furthermore, the power end, the first driving end and the second driving end are respectively positioned at four corners of a quadrangle, and a connecting line of the two driving ends is intersected with a connecting line of the power end and the first driving end.
The beneficial effect of adopting the further scheme is that: the swing direction of the forward end swing arm and the swing direction of the backward end swing arm are different in the forward mode and the backward mode by adopting a similar four-bar linkage structure, but the HST discharge capacity and the engine throttle can be synchronously increased.
Further, an arc-shaped limiting groove is formed in the driving plate, a limiting pin is arranged on the rack, and the limiting pin moves along the limiting groove in the rotating process of the driving plate.
The beneficial effect of adopting the further scheme is that: the arc-shaped limiting groove is formed in the driving plate, and the limiting pin is arranged in the limiting groove, so that the driving plate can rotate more stably.
And furthermore, the device also comprises a return spring for returning the driving plate, wherein one end of the return spring is connected to the rack, and the other end of the return spring is connected to the driving plate.
The beneficial effect of adopting the further scheme is that: the return spring is arranged, so that the driving plate can return automatically when the foot accelerator is loosened.
Further, the gear shifting mechanism comprises a switching shaft and a shifting fork, the shifting fork is connected with the HST displacement adjusting part through a movable arm, the forward end swing arm and the backward end swing arm are respectively and rotatably connected onto the switching shaft, the shifting fork can be axially connected onto the switching shaft along the switching shaft in a moving mode, and the shifting fork can be meshed with the forward end swing arm or the backward end swing arm to realize switching between a forward mode and a backward mode.
The beneficial effect of adopting the further scheme is that: the switching between the forward mode and the backward mode is realized by the engagement of the shifting fork and the forward end swing arm or the backward end swing arm.
Further, the switching shaft is vertically spaced from the forward end link and the backward end link, respectively.
The beneficial effect of adopting the further scheme is that: the switching shaft is vertically arranged at intervals with the forward end connecting rod and the backward end connecting rod, installation control can be provided for the swing arm, transmission among the connecting rod, the swing arm and the switching shaft is facilitated, and finally the switching shaft rotates and drives the swing arm to drive the HST discharge adjusting part to achieve HST discharge adjustment.
Further, the HST displacement adjusting part comprises a meniscus and a trunnion, the center of a straight edge of the meniscus is coaxially and fixedly connected with the trunnion, and one end of an arc-shaped edge of the meniscus is connected with the gear shifting mechanism through a connecting rod.
The beneficial effect of adopting the further scheme is that: the meniscus is connected with gear shift mechanism through the connecting rod, and gear shift mechanism is through switching the mode of advancing or retreating, when stepping on the foot throttle, can promote the meniscus and the trunnion rotation on it through the connecting rod, realizes HST discharge capacity and adjusts.
Furthermore, the meniscus positioning device further comprises a zero position arm and a zero position spring, an open slot is formed in the position, close to the other end of the arc-shaped edge, of the meniscus, one end of the zero position arm is hinged to the rack, the other end of the zero position arm is connected to the rack through the zero position spring, a limiting part is arranged on the zero position arm, and the limiting part is located in the open slot and can be moved along the open slot.
The beneficial effect of adopting the further scheme is that: after the accelerator pedal is loosened, the meniscus returns to the zero position under the action of the zero position spring, and the matching of the open slot and the limiting part on the zero position arm is utilized to ensure that the meniscus can return to the zero position and is not too fast when returning, so that the danger of the tilting of the tail of the vehicle caused by the emergency brake phenomenon when the returning is too fast is avoided.
An agricultural machine comprising an engine, an HST and said HST operating mechanism, said HST displacement adjustment member being mounted on said HST for adjusting displacement.
The invention has the beneficial effects that: the agricultural machine provided by the invention can ensure that the steering wheel is held by two hands when the speed is increased or decreased, the S shape of an operation route is reduced, the directional stability is improved, the handle rod is not required to be frequently operated, the comfortableness is high, the labor intensity of a driver is greatly reduced, and when the agricultural machine climbs a slope, passes through a ridge and is loaded on a truck, the steering wheel is operated by two hands, so that the safety is high.
Drawings
FIG. 1 is a schematic view of the mounting structure of the HST control mechanism of the present invention;
fig. 2 is another schematic orientation of the mounting structure of the HST handling structure of the present invention;
fig. 3 is an enlarged schematic view of a portion a in fig. 2.
In the drawings, the components represented by the respective reference numerals are listed below:
1. an HST displacement adjuster; 11. a meniscus; 12. a trunnion; 13. a connecting rod;
2. a forward end swing arm; 3. a rear end swing arm; 4. a foot throttle; 41. a foot accelerator cable; 42. an engine throttle cable;
5. a drive mechanism; 51. a drive plate; 511. a limiting groove; 512. a spacing pin; 52. a forward end connecting rod; 53. a retreating end connecting rod; 54. a return spring;
6. a gear shift mechanism; 61. a switching shaft; 62. a shifting fork; 63. a movable arm; 64. a shift fork plate;
7. a null arm; 71. a zero position spring; 72. a limiting member;
8、HST。
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
As shown in fig. 1-3, an HST control mechanism of this embodiment includes an HST displacement adjusting member 1, a gear shift mechanism 6, a forward end swing arm 2, a backward end swing arm 3 and a driving mechanism 5, where the driving mechanism 5 is hinged to a frame, a power end of the driving mechanism 5 is connected to a foot accelerator 4 through a foot accelerator cable 41, a first driving end of the driving mechanism 5 is connected to an engine through an engine accelerator cable 42, a second driving end of the driving mechanism 5 is connected to the forward end swing arm 2 and the backward end swing arm 3 respectively, the forward end swing arm 2 and the backward end swing arm 3 are connected to the gear shift mechanism 6 respectively and realize switching between a forward mode and a backward mode through the gear shift mechanism 6, and the gear shift mechanism 6 is connected to the HST displacement adjusting member 1; in the forward mode or the backward mode, the driving mechanism 5 drives the engine throttle and simultaneously drives the forward end swing arm 2 or the backward end swing arm 3 to swing, so that the shifting mechanism 6 synchronously acting with the forward end swing arm 2 or the backward end swing arm 3 pushes the HST displacement adjusting piece 1 to increase or decrease the HST displacement.
In the HST control mechanism of the embodiment, the driving mechanism is respectively connected with the accelerator pull wire of the engine and the forward and backward swinging arm, when the accelerator pedal is trampled, the displacement of the accelerator of the engine and the displacement of the HST can be simultaneously increased or decreased, so that a handle rod is not frequently operated by hands during acceleration and deceleration, the labor intensity of a driver is greatly reduced, a steering wheel is ensured to be held by two hands during acceleration and deceleration, the S shape of an operation route is reduced, and the direction stability is improved; when climbing a slope, crossing a bank and getting on a truck, the steering wheel can be operated by two hands, and the safety is high.
As shown in fig. 1-3, the driving mechanism 5 includes a driving plate 51, a forward end connecting rod 52 and a backward end connecting rod 53, the driving plate 51 is hinged to the frame at the middle, the power end, the first driving end and the second driving end are respectively located on the driving plate 51, and the second driving end is respectively connected to the forward end oscillating arm 2 and the backward end oscillating arm 3 through the forward end connecting rod 52 and the backward end connecting rod 53. The driving plate is matched with the connecting rod to drive the forward and backward swinging arms respectively, and the rotation angle of the driving plate can be controlled through a pull wire when the accelerator is stepped, so that the engine accelerator and the HST discharge capacity are increased simultaneously, and the increase of the vehicle speed is realized.
According to a specific scheme of the embodiment, the power end, the first driving end and the second driving end are respectively located at four corners of a quadrangle, and a connecting line of the two driving ends is intersected with a connecting line of the power end and the first driving end. The swing direction of the forward end swing arm and the swing direction of the backward end swing arm are different in the forward mode and the backward mode by adopting a similar four-bar linkage structure, but the HST discharge capacity and the engine throttle can be synchronously increased.
As shown in fig. 1, the driving plate 51 of this embodiment is provided with a circular arc-shaped limiting groove 511, the rack is provided with a limiting pin 512, and during the rotation of the driving plate 51, the limiting pin 512 moves along the limiting groove 511. The arc-shaped limiting groove is formed in the driving plate, and the limiting pin is arranged in the limiting groove, so that the driving plate can rotate more stably.
As shown in fig. 2 and 3, the control mechanism of the present embodiment further includes a return spring 54 for returning the driving plate 51, wherein one end of the return spring 54 is connected to the frame, and the other end is connected to the driving plate 51. The return spring is arranged, so that the driving plate can return automatically when the foot accelerator is loosened.
Specifically, as shown in fig. 1 to 3, the driving plate 51 of the present embodiment is a vertically arranged triangular structure, two corners of which are respectively connected to the forward end connecting rod 52 and the backward end connecting rod 53, the other corner is located at the lowest end for connecting the foot throttle cable 41, the upper end edge of the triangular structure extends upward to form a connecting arm for connecting the engine throttle cable 42, and the forward end connecting rod 52 and the backward end connecting rod 53 are arranged in parallel and respectively hinged to two corners at two sides of the triangular structure. The return spring 54 is connected to the upper end edge of the triangular structure at a position between the hinge points of the connecting arm and the retreating-end connecting rod 53. The forward end link 52 and the backward end link 53 are respectively hinged at their lower ends to the forward end swing arm 2 and the backward end swing arm 3, and the forward end swing arm 2 and the backward end swing arm 3 are respectively located at the same side of the drive plate 51.
As shown in fig. 1 to 3, the shift mechanism 6 includes a switching shaft 61 and a shift fork 62, the shift fork 62 is connected to the HST displacement adjusting element 1 through a movable arm 63 extending downward, the forward end swing arm 2 and the reverse end swing arm 3 are respectively rotatably connected to the switching shaft 61, the shift fork 62 is axially movably connected to the switching shaft 61 along the switching shaft 61, and the shift fork 62 can be engaged with the forward end swing arm 2 or the reverse end swing arm 3 to switch between the forward mode and the reverse mode. The switching between the forward mode and the backward mode is realized by the engagement of the shifting fork and the forward end swing arm or the backward end swing arm. The gear shifting mechanism 6 further comprises a gear shifting fork plate 64, the gear shifting fork plate 64 is respectively connected with the shifting fork 62 and a gear shifting operating handle, the gear shifting fork plate 64 drives the shifting fork connected with the gear shifting fork plate to axially move along the switching shaft 61 by operating the gear shifting operating handle, the shifting fork 62 is meshed with the forward end swing arm 2 or the backward end swing arm 3, and switching of a forward mode or a backward mode is achieved.
As shown in fig. 1, the switching shaft 61 is arranged vertically spaced from the forward end link 52 and the backward end link 53, respectively. The switching shaft is vertically arranged at intervals with the forward end connecting rod and the backward end connecting rod, installation control can be provided for the swing arm, transmission among the connecting rod, the swing arm and the switching shaft is facilitated, and finally the switching shaft rotates and drives the swing arm to drive the HST discharge adjusting part to achieve HST discharge adjustment.
As shown in fig. 1-3, the HST displacement adjuster 1 includes a meniscus 11 and a trunnion 12, the center of the straight edge of the meniscus 11 is coaxially and fixedly connected with the trunnion 12, and one end of the arc-shaped edge of the meniscus 11 is connected with the gear shift mechanism 6 through a connecting rod 13. Two ends of the connecting rod 13 are hinged to one end of the meniscus arc edge and the movable arm 63 through spherical hinges respectively. The trunnion 12 is connected with an HST variable rod for HST displacement adjustment. The meniscus is connected with gear shift mechanism through the connecting rod, and gear shift mechanism is through switching the mode of advancing or retreating, when stepping on the foot throttle, can promote the meniscus and the trunnion rotation on it through the connecting rod, realizes HST discharge capacity and adjusts.
As shown in fig. 1 to 3, the operating mechanism of this embodiment further includes a zero-position arm 7 and a zero-position spring 71, an open slot is formed in a position of the meniscus 11 close to the other end of the arc edge, one end of the zero-position arm 7 is hinged to the rack, the other end of the zero-position arm is connected to the rack through the zero-position spring 71, a limiting member 72 is disposed on the zero-position arm 7, and the limiting member 72 is located in the open slot and can move along the open slot. The zero-position arm 7 is located on one side, close to the shifting mechanism, of the meniscus 11, the edge of one side, close to the meniscus, of the zero-position arm is provided with the open slot, the limiting pin is provided with the gasket, the limiting pin is arranged in the open slot and can be followed the slot wall of the open slot moves, and the gasket is in a compression joint mode above the meniscus and can achieve the purpose of axial limiting on the open slot. After the accelerator pedal is loosened, the meniscus returns to the zero position under the action of the zero position spring, and the matching of the open slot and the limiting part on the zero position arm is utilized to ensure that the meniscus can return to the zero position and is not too fast when returning, so that the danger of the tilting of the tail of the vehicle caused by the emergency brake phenomenon when the returning is too fast is avoided.
The working process of the HST control mechanism of the embodiment is that in the forward mode, the shift operating handle is operated to enable the shifting fork connected with the shift operating handle to be meshed with the forward end swing arm, the shift operating handle enters the forward mode, the foot throttle is stepped on, the foot throttle pull wire connected with the foot throttle pulls the bottom end of the driving plate to enable the forward end connecting rod to move upwards to drive the forward end swing arm to swing upwards, the forward end swing arm drives the shifting fork and the switching shaft to rotate, the movable arm on the shifting fork drives the connecting rod connected with the shifting fork to move, and the connecting rod pushes the meniscus hinged with the connecting rod to rotate, so that the increase of the HST; when the HST discharge capacity is increased, the foot throttle stay wire and the engine throttle stay wire are arranged at the bottom end and the top end of the same drive plate, and the engine throttle stay wire is dragged by the drive plate while the drive plate rotates under the pulling action of the foot throttle stay wire, so that the engine throttle and the HST discharge capacity are simultaneously increased, and the function of automatic speed change is achieved. When in a backward mode, the gear-shifting operation handle is operated to enable a shifting fork connected with the gear-shifting operation handle to be meshed with a backward end swinging arm to enter the backward mode, a foot accelerator is stepped on, a foot accelerator cable connected with the foot accelerator pulls the bottom end of a driving plate to enable a backward end connecting rod to move downwards to drive the backward end swinging arm to swing downwards, the backward end swinging arm drives the shifting fork and a switching shaft to rotate, a movable arm on the shifting fork drives a connecting rod connected with the shifting fork to move, and the connecting rod pushes a meniscus hinged with the connecting rod to rotate to increase the HST displacement; when the HST discharge capacity is increased, the foot throttle stay wire and the engine throttle stay wire are arranged at the bottom end and the top end of the same drive plate, and the engine throttle stay wire is dragged by the drive plate while the drive plate rotates under the pulling action of the foot throttle stay wire, so that the engine throttle and the HST discharge capacity are simultaneously increased, and the function of automatic speed change is achieved. When the foot throttle is released, the driving plate automatically returns under the action of a return spring no matter in a forward mode or a backward mode. The meniscus returns to the zero position under the matching action of the zero position arm and the zero position spring and the matching action of the limiting pin and the open slot.
The forward and reverse shift mechanism of the HST control mechanism of the present embodiment functions to switch only the forward and reverse modes without changing the magnitude of the HST displacement. In the embodiment, the engine throttle cable and the HST variable rod are connected to the same driving plate, and when the foot throttle is stepped, the engine throttle and the HST displacement can be synchronously increased, so that the function of automatic speed change is achieved. When this embodiment makes to loosen the foot throttle through zero-position mechanism, HST can get back to the zero-position automatically, utilizes the cooperation of zero-position arm, spacer pin and open slot simultaneously, plays the purpose of control return speed, prevent to appear warping the tail phenomenon.
The HST control structure of the embodiment can ensure that both hands hold the steering wheel when increasing and decreasing the speed, reduces the S shape of the operation route and improves the direction stability; the mechanism can ensure that a handle is not frequently operated by hands during acceleration and deceleration, realizes high comfort of 'automatic gear' like a car, and greatly reduces the labor intensity of a driver; when climbing a slope, crossing a bank and getting on a truck, the steering wheel is operated by hands with both hands, so that the safety is high.
Example 2
The agricultural machine of the embodiment comprises an engine, an HST 8 and the HST control mechanism, wherein the HST displacement adjusting piece 1 is installed on the HST 8 and used for adjusting the displacement. The agricultural machinery of this embodiment can guarantee that the steering wheel is held to both hands when increasing and decreasing speed, "S" type that reduces the operation route improves the direction stability, need not frequently operate the handle pole, and the travelling comfort is high, greatly reduced driver' S intensity of labour, when climbing, cross the ridge and go up the truck, both hands operate the steering wheel, and the security is high.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed 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 such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. An HST control mechanism is characterized by comprising an HST displacement adjusting piece, a gear shifting mechanism, a forward end swing arm, a backward end swing arm and a driving mechanism, wherein the driving mechanism is hinged to a rack, the power end of the driving mechanism is connected with a foot accelerator through a foot accelerator pull wire, the first driving end of the driving mechanism is connected with an engine through an engine accelerator pull wire, the second driving end of the driving mechanism is respectively connected with the forward end swing arm and the backward end swing arm, the forward end swing arm and the backward end swing arm are respectively connected to the gear shifting mechanism and realize switching between a forward mode and a backward mode through the gear shifting mechanism, and the gear shifting mechanism is connected with the HST displacement adjusting piece; in the forward mode or the backward mode, the driving mechanism drives the engine throttle and simultaneously drives the forward end swing arm or the backward end swing arm to swing, so that the shifting mechanism synchronously acting with the driving mechanism pushes the HST displacement adjusting piece to increase or decrease the HST displacement.
2. The HST control mechanism according to claim 1, wherein the driving mechanism comprises a driving plate, a forward end connecting rod and a backward end connecting rod, the driving plate is hinged to the frame at the middle part, the power end, the first driving end and the second driving end are respectively located on the driving plate, and the second driving end is respectively connected with the forward end swing arm and the backward end swing arm through the forward end connecting rod and the backward end connecting rod.
3. The HST control mechanism according to claim 2, wherein the power end, the first driving end and the second driving end are located at four corners of a quadrilateral, and a connecting line of the second driving end intersects with a connecting line of the power end and the first driving end.
4. The HST control mechanism according to claim 2, wherein the driving plate has a circular-arc-shaped limiting groove, the frame has a limiting pin, and the limiting pin moves along the limiting groove during the rotation of the driving plate.
5. The HST control mechanism of claim 2, further comprising a return spring for returning the drive plate, the return spring having one end connected to the frame and the other end connected to the drive plate.
6. The HST control mechanism according to any one of claims 2 to 5, wherein the shifting mechanism comprises a switching shaft and a shifting fork, the shifting fork is connected with the HST displacement adjusting part through a movable arm, the forward end swing arm and the backward end swing arm are respectively and rotatably connected onto the switching shaft, the shifting fork is axially movably connected onto the switching shaft along the switching shaft, and the shifting fork can be meshed with the forward end swing arm or the backward end swing arm to realize switching between the forward mode and the backward mode.
7. The HST control mechanism according to claim 6, wherein the switching shaft is vertically spaced from the forward end link and the rearward end link, respectively.
8. The HST control mechanism as claimed in any one of claims 1-5 and 7, wherein the HST displacement adjusting piece comprises a meniscus and a trunnion, the center of the straight edge of the meniscus is fixedly connected with the trunnion coaxially, and one end of the arc-shaped edge of the meniscus is connected with the gear shifting mechanism through a connecting rod.
9. The HST control mechanism according to claim 8, further comprising a zero lever arm and a zero spring, wherein an open slot is formed at a position of the meniscus near the other end of the arc-shaped edge, one end of the zero lever arm is hinged to the frame, the other end of the zero lever arm is connected to the frame through the zero spring, and a limiting member is disposed on the zero lever arm and located in the open slot and movable along the open slot.
10. An agricultural machine comprising an engine, an HST and an HST operating mechanism as claimed in any of claims 1 to 9, wherein the HST displacement adjustment member is mounted on the HST for adjusting the displacement.
CN201911162875.0A 2019-11-25 2019-11-25 HST control mechanism and agricultural machine Active CN110641279B (en)

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JP2006077427A (en) * 2004-09-08 2006-03-23 Hitachi Constr Mach Co Ltd Wheel type hydraulic excavator
KR20140128787A (en) * 2013-04-29 2014-11-06 대동공업주식회사 Agricultural vehicle
CN203769948U (en) * 2014-03-03 2014-08-13 中联重科股份有限公司 Construction machinery and throttle linkage mechanism thereof
CN104989813B (en) * 2015-07-21 2017-05-31 山东巨明机械有限公司 The lever operation system of HST variable speed multi gear one
JP2018031458A (en) * 2016-08-26 2018-03-01 株式会社小松製作所 Wheel loader, control method of wheel loader and control system of wheel loader
CN109263470A (en) * 2016-08-31 2019-01-25 泉州鑫豪工程机械科技有限公司 Engineering truck throttle and traveling control system and method
CN208719331U (en) * 2018-07-19 2019-04-09 佳木斯常发佳联农业装备有限公司 A kind of hydraulic stepless speed change drive system of grain combine

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