CN109611221B

CN109611221B - Accelerator control system

Info

Publication number: CN109611221B
Application number: CN201910151895.1A
Authority: CN
Inventors: 何树营; 曹春花; 余丽艳; 沈彦斌; 关祥龙; 张翠翠; 李辉
Original assignee: Shantui Chutian Construction Machinery Co Ltd
Current assignee: Shantui Chutian Construction Machinery Co Ltd
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2021-02-09
Anticipated expiration: 2039-02-28
Also published as: CN109611221A

Abstract

The invention relates to the technical field of accelerator control systems, and particularly discloses an accelerator control system, which comprises a hand accelerator handle, a vehicle body and a control device, wherein the hand accelerator handle is pivoted on the vehicle body; the first end of the first flexible shaft is connected with a hand throttle handle; the second end of the first flexible shaft is connected with the first end of the first flexible shaft, the middle part of the rotating handle is pivoted to the vehicle body, the first end of the second flexible shaft is connected with the second end of the rotating handle, and the second flexible shaft is used for being connected with an engine throttle; the foot brake pedal is pivoted with the vehicle body; the position sensor is arranged on a foot brake pedal and is connected with the controller, and the controller controls the current of the pump motor according to a position signal transmitted back by the position sensor; a first end of the connecting rod is pivoted with the foot brake pedal; the second end of the connecting rod is in selective transmission fit with the rotating handle through the connecting component, and when the foot brake pedal is not trampled, the second end of the connecting rod is in transmission fit with the rotating handle, so that the position of the foot brake pedal cannot be changed when the hand accelerator handle is controlled independently, and the speed stability of a vehicle is guaranteed.

Description

Accelerator control system

Technical Field

The invention relates to the technical field of accelerator control systems, in particular to an accelerator control system.

Background

The hydrostatic transmission engineering vehicle with a mechanical accelerator engine has two functions of a foot brake pedal: one is to depress the foot brake pedal to reduce the engine speed; the other is that a position sensor is arranged on a foot brake pedal to realize the detection of the foot brake position, the foot brake pedal corresponds to different pump motors to control the current at different positions, namely, the stepping on the foot brake pedal can realize the reduction of the running speed through the control of the pump motors.

Taking a bulldozer as an example, a hydrostatic transmission bulldozer adopting a mechanical engine at present has the advantages that the accelerator operation is controlled by the linkage of a hand accelerator and a foot brake, the accelerator opening degree of the engine can be controlled to be reduced by stepping on the foot accelerator, the accelerator opening degree of the engine can be controlled to be increased or reduced by controlling the hand accelerator, and the other one can follow up when either the hand accelerator or the foot brake is operated. Especially when the throttle opening is reduced through the hand throttle, the foot brake can follow the downward action, and the position of the position sensor can change, so that the rotating speed of the engine and the control current of the pump motor can be reduced, when the engine is in a medium-small throttle state, the running speed is reduced too fast, and the operating efficiency is reduced.

Disclosure of Invention

The invention aims to: the accelerator control system is used for solving the problem that in the accelerator control system of the hydrostatic transmission engineering vehicle in the prior art, a foot accelerator is linked with a hand accelerator, and when the opening degree of an engine accelerator is controlled independently through the hand accelerator, the speed of the vehicle changes.

The invention provides a throttle control system, comprising:

the hand throttle handle is pivoted with the vehicle body;

the first end of the first flexible shaft is connected with the hand throttle handle;

the second end of the first flexible shaft is connected with the first end of the rotating handle, and the middle part of the rotating handle is pivoted to the vehicle body;

the first end of the second flexible shaft is connected with the second end of the rotating handle, and the second flexible shaft is used for being connected with an engine throttle;

the foot brake pedal is pivoted with the vehicle body;

the position sensor is arranged on the foot brake pedal and connected with the controller, and the controller controls the current of the pump motor according to a position signal transmitted back by the position sensor;

the first end of the connecting rod is pivoted with the foot brake pedal;

coupling assembling, the second end of connecting rod passes through coupling assembling with change handle selective drive cooperation, and work as when the foot brake pedal is not trampled, the connecting rod passes through coupling assembling with the change handle does not have the transmission cooperation, when trampling during the foot brake pedal, the connecting rod passes through coupling assembling with change handle transmission cooperation.

As a preferable aspect of the throttle operating system, the connecting assembly includes:

the first end of the first connecting rod is pivoted with the second end of the connecting rod;

the first driving gear is fixedly connected to the first connecting rod and is pivoted with the vehicle body;

the first intermediate gear is always meshed with the first driving gear, a limiting groove is formed in the vehicle body, and a rotating shaft of the first intermediate gear is located in the limiting groove and is in sliding fit with the limiting groove;

the first driven gear is fixedly mounted on the rotating handle, the center of the first driven gear is overlapped with the center of the rotating handle, which rotates relative to the vehicle body, the first intermediate gear is provided with a first position and a second position, the first intermediate gear can rotate between the first position and the second position, when the first intermediate gear is located at the first position, the first intermediate gear is separated from the first driven gear, when the first intermediate gear is located at the second position, the first intermediate gear is meshed with the first driven gear, and the rotating shaft of the first intermediate gear abuts against the end part of the limiting groove.

As a preferred scheme of the accelerator control system, the first intermediate gear comprises a coaxial pinion and a bull gear, the bull gear is fixedly connected with the pinion, the first driving gear is always engaged with the pinion, and when the first intermediate gear is located at the second position, the bull gear is engaged with the first driven gear.

As a preferred scheme of the accelerator control system, the limiting groove is an arc groove, and the circle center of the limiting groove coincides with the center of the first driving gear, which rotates relative to the vehicle body.

the first end of the second connecting rod is pivoted with the connecting rod;

the cam is pivoted to the vehicle body, and the second connecting rod is used for driving the cam to rotate;

the cam is provided with a third position and a fourth position, the cam can rotate between the third position and the fourth position, when the cam is positioned at the third position, the cam is in non-transmission fit with the second driven gear, and when the cam is positioned at the fourth position, the cam is in transmission fit with the second driven gear.

As the preferred scheme of throttle control system, coupling assembling still include the pin joint in the second intermediate gear of automobile body, the second intermediate gear with the meshing of second driven gear, the equipartition has the meshing tooth on the convex surface of cam, works as the cam is located when the third position, the base circular surface of cam with the second intermediate gear is relative, just the base circular surface of cam with the clearance fit of second intermediate gear, works as the cam is located when the fourth position, the meshing tooth with the meshing of second intermediate gear.

As the preferred scheme of throttle operating system, coupling assembling still includes the third connecting rod, the first end of third connecting rod with the second end pin joint of connecting rod, the middle part of third connecting rod with the automobile body pin joint, the third connecting rod has fifth position and sixth position, works as the third connecting rod is located during the fifth position, the second end of third connecting rod with the second end separation of turning handle, works as the third connecting rod is located during the sixth position, the second end of third connecting rod with the second end butt of turning handle.

As a preferred scheme of the throttle control system, the first flexible shaft comprises:

the first end of the first rod is connected with the hand throttle handle;

the box body is in sliding fit with the first rod;

the first pressure spring is sleeved on the first rod;

the first baffle seat is fixedly connected to the second end of the first rod and is positioned in the box body in a sliding manner;

the first end of the second rod is connected with the box body, the second end of the second rod is connected with the rotating handle, the first pressure spring and the second rod are respectively located on two sides of the first blocking seat, and two ends of the first pressure spring are respectively abutted to the box body and the first blocking seat.

As a preferable scheme of the throttle control system, the connecting rod comprises a third rod, a fourth rod, a second baffle seat and a second pressure spring; the first end of third pole with the pin joint of foot brake pedal, the second end of third pole with the first end sliding fit of fourth pole, the second end of fourth pole passes through coupling assembling with the selective transmission cooperation of turning handle, the second keeps off the seat and is fixed in the fourth pole, the second pressure spring cover is located the fourth pole, the second pressure spring respectively with the second keep off the seat with the second end butt of third pole, the second pressure spring with the first end of fourth pole is located respectively the both sides of the second end of third pole.

As the preferred scheme of the accelerator operating system, the accelerator operating system further includes an elastic component, a first limiting component and a second limiting component, the first limiting component and the second limiting component are installed on the vehicle body, the first limiting component and the second limiting component are respectively located at two sides of the foot brake pedal, the foot brake pedal can be respectively abutted against the first limiting component and the second limiting component, the elastic component is used for driving the foot brake pedal to be abutted against the first limiting component, and when the foot brake pedal is not trampled, the foot brake pedal is abutted against the first limiting component.

The invention has the beneficial effects that:

the invention provides an accelerator control system, a hand accelerator handle of the accelerator control system controls a rotating handle to rotate through a first flexible shaft, the rotating handle drives a second flexible shaft to control the size of an engine accelerator, a foot brake pedal is provided with a position sensor and can change the position along with the rotation of the foot brake pedal, the position sensor transmits a signal representing the position of the position sensor to a controller, the controller controls the control current of a pump motor according to the control current, so as to control the running speed of a vehicle, the foot brake pedal drives a connecting rod to rotate, the connecting rod selectively drives the rotating handle to rotate through a connecting component, when the foot brake pedal is not trampled, the connecting rod is not in transmission fit with the rotating handle, when the foot brake pedal is trampled, the connecting rod can be in transmission fit with the rotating handle through the connecting component, therefore, when the independent accelerator handle is operated, the rotating handle can not cause the power to be transmitted to the, the position of the foot brake pedal and the position of the position sensor can not be changed, so that the control current of the pump motor can be ensured, and the maximum capacity of the pump motor can be exerted.

Drawings

FIG. 1 is a schematic structural diagram of an oil door operating system according to an embodiment of the present invention;

FIG. 2 is a partial schematic structural view of a first idler gear of the connecting assembly in a first position according to one embodiment of the present invention;

FIG. 3 is a partial schematic structural view of the first idler gear of the connecting assembly in a second position according to one embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first compression spring of a first flexible shaft in a natural extension state according to a first embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first compression spring of a first flexible shaft in a compressed state according to a first embodiment of the present invention;

fig. 6 is a partial structural schematic view of a second compression spring of a connecting rod in a natural extension state according to an embodiment of the present invention;

fig. 7 is a partial structural schematic view of a connecting rod according to a first embodiment of the present invention, in which a second compression spring is in a compressed state;

FIG. 8 is a schematic structural diagram of an oil door operating system in the second embodiment of the present invention;

FIG. 9 is a partial schematic structural view of a second throttle actuation system according to an embodiment of the present invention, wherein the cam is located at a third position (the connecting assembly includes a second connecting rod, a cam and a second driven gear);

FIG. 10 is a partial schematic structural view of a second throttle actuation system according to an embodiment of the present invention, with the cam in a fourth position (the connecting assembly includes a second connecting rod, the cam and a second driven gear);

FIG. 11 is a partial schematic structural view of a second throttle actuation system according to an embodiment of the present invention, with the cam in a third position (the linkage assembly includes a second connecting rod, the cam, a second intermediate gear, and a second driven gear);

FIG. 12 is a partial schematic structural view of a second throttle actuation system according to an embodiment of the present invention with the cam in a fourth position (the linkage assembly includes a second connecting rod, the cam, a second intermediate gear, and a second driven gear);

fig. 13 is a partial schematic structural view of a cam in a second throttle control system according to an embodiment of the present invention when the cam is located at a third position (the connecting assembly includes a second connecting rod, a second driving gear, a cam, a transmission gear, and a second driven gear);

fig. 14 is a partial schematic structural diagram of a second throttle operating system according to an embodiment of the present invention, in which the cam is located at a fourth position (the connecting assembly includes a second connecting rod, a second driving gear, a cam, a transmission gear, and a second driven gear).

In the figure:

1. a hand throttle handle;

2. a first flexible shaft; 21. a first lever; 22. a second lever; 23. a box body; 24. a first pressure spring; 25. a first stopper seat;

3. a handle is rotated; 4. a second flexible shaft; 5. a foot brake pedal; 6. a position sensor;

7. a connecting rod; 71. a third lever; 72. a fourth bar; 73. a second stopper seat; 74. a second pressure spring;

8. a connecting assembly; 801. a first connecting rod; 802. a first drive gear; 803. a first intermediate gear; 804. a first driven gear; 805. a limiting groove; 811. a second connecting rod; 812. a cam; 813. a second driven gear; 814. a second intermediate gear; 815. a second driving gear; 816. a transmission gear;

9. a first limit piece; 10. a second limiting member.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

Referring to fig. 1 to 7, fig. 1 is a schematic structural diagram of an oil door operating system according to an embodiment of the present invention; fig. 2 is a partial schematic structural view of the first intermediate gear 803 of the connecting assembly 8 in the first position according to the first embodiment of the present invention; fig. 3 is a partial schematic structural view of the first intermediate gear 803 of the connecting assembly 8 in the second position according to the first embodiment of the present invention; fig. 4 is a schematic structural diagram of the first compression spring 24 of the first flexible shaft 2 in a natural extension state according to the first embodiment of the present invention; fig. 5 is a schematic structural diagram of the first compression spring 24 of the first flexible shaft 2 in a compressed state according to the first embodiment of the present invention; fig. 6 is a partial structural schematic view of the connecting rod 7 according to the first embodiment of the present invention, in which the second compression spring 74 is in a natural extension state; fig. 7 is a partial structural schematic diagram of the connecting rod 7 according to the first embodiment of the present invention, in which the second compression spring 74 is in a compressed state. The embodiment provides an accelerator control system, which comprises a hand accelerator handle 1, a first flexible shaft 2, a rotating handle 3, a second flexible shaft 4, a foot brake pedal 5, a position sensor 6, a connecting rod 7 and a connecting assembly 8. The hand throttle handle 1 is pivoted on the automobile body, and the first end of first flexible axle 2 is connected with hand throttle handle 1. Specifically, the first end of hand throttle handle 1 is used for the staff to control, and the middle part pin joint of hand throttle handle 1 is on the automobile body, and the second end of hand throttle handle 1 is connected with the first end of first flexible axle 2. The second end of the first flexible shaft 2 is connected with the first end of the rotating handle 3, and the middle part of the rotating handle 3 is pivoted on the vehicle body. The first end of the second flexible shaft 4 is connected with the second end of the rotating handle 3, and the second flexible shaft 4 is used for being connected with an engine throttle. When the hand accelerator handle 1 is pulled one by one, the hand accelerator handle 1 drives the rotating handle 3 to rotate through the first flexible shaft 2, and the rotating handle 3 adjusts the opening degree of the accelerator of the engine through the second flexible shaft 4.

The foot brake pedal 5 is pivoted on the vehicle body, the position sensor 6 is installed on the foot brake pedal 5, the position sensor 6 is connected with the controller, and the controller controls the current of the pump motor according to a position signal transmitted back by the position sensor 6. The first end of connecting rod 7 and the pin joint of foot brake pedal 5, the second end of connecting rod 7 passes through coupling assembling 8 and the selective transmission cooperation of turning handle 3, and when foot brake pedal 5 was not trampled, the second end of connecting rod 7 with turning handle 3 do not have the transmission cooperation, and when foot brake pedal 5 was trampled, the second end of connecting rod 7 can cooperate with the transmission of turning handle 3. Therefore, when the foot brake pedal 5 is stepped on, the connecting rod 7 can be in transmission connection with the rotating handle 3 through the connecting assembly 8, the opening of the engine throttle valve is adjusted through the second flexible shaft 4 by the rotating handle 3, the position of the position sensor 6 is driven to change, the control current of the pump motor is controlled through the position sensor 6, and the control of the running speed of the vehicle is realized.

In this embodiment, the first end of the foot brake pedal 5 is used for the person to step on, the second end of the foot brake pedal 5 is pivoted with the vehicle body, and the middle part of the foot brake pedal 5 is pivoted with the connecting rod 7. Of course, the specific arrangement of the foot brake pedal 5 in this embodiment is not limited, and in other embodiments, the first end of the foot brake pedal 5 may be used for being stepped on by a person, the middle portion of the foot brake pedal 5 may be pivotally connected to the vehicle body, and the second end of the foot brake pedal 5 may be pivotally connected to the connecting rod 7.

The principle of the controller controlling the magnitude of the pump motor current in this embodiment is as follows: when the foot brake pedal 5 is stepped, the foot brake pedal 5 rotates and drives the position sensor 6 to rotate, the position sensor 6 transmits a detected position signal to the controller, and the controller compares the position signal stored in the controller in advance with the map of the pump motor current according to the received position signal to obtain the corresponding pump motor current and accordingly control the current of the pump motor.

It should be noted that the second end of the connecting rod 7 can be in transmission fit with the rotating handle 3 when the foot brake pedal 5 is stepped on, and it can be understood that the second end of the connecting rod 7 can be in transmission fit with the rotating handle 3 as long as the foot brake pedal 5 is stepped on downwards, and it can also be understood that the second end of the connecting rod 7 can be in transmission fit with the rotating handle 3 after the foot brake pedal 5 is stepped on downwards and is stepped on for a certain distance. The vehicle body in this embodiment and the vehicle body in other embodiments refer to a vehicle body or chassis, or a support frame mounted on the vehicle body or chassis.

In the embodiment, when the foot brake pedal 5 is stepped downwards to enable the connecting rod 7 to be in transmission connection with the rotating handle 3 through the connecting assembly 8, the rotating handle 3 adjusts the accelerator opening of the engine to be smaller through the second flexible shaft 4, so that the vehicle can be in a medium-small accelerator working state. At the same time, as the foot brake pedal 5 is stepped on to rotate, the control current of the position sensor 6 controlling the pump motor is reduced synchronously, and the vehicle speed is reduced. When the hand throttle handle 1 is operated, the hand throttle handle 1 can adjust the opening degree of the throttle of the engine to be increased or decreased through the first flexible shaft 2, the rotating handle 3 and the second flexible shaft 4. Of course, this embodiment is not limited to this, and in another embodiment, the accelerator opening degree may be increased when the foot brake pedal 5 is depressed downward, and the accelerator opening degree may be decreased when the foot brake pedal 5 is depressed and rebounded, and the control current for controlling the pump motor by the position sensor 6 may be decreased simultaneously, so that the vehicle speed may be decreased.

The throttle control system that this embodiment provided, when manipulating hand throttle handle 1, and trample foot brake pedal 5 when not trampled, because turning handle 3 and connecting rod 7 separation, thereby turning handle 3 can not drive power to the transmission of foot brake pedal 5, can not cause foot brake pedal 5 to rotate passively, and then can prevent position sensor 6's position change, guarantee that pump motor's control current is unchangeable, consequently can adjust engine throttle aperture through hand throttle handle 1 alone, and can not influence pump motor's control. In the embodiment, the working efficiency of the medium and small throttle can be effectively ensured.

Referring to fig. 2 and 3, the connecting assembly 8 includes a first connecting rod 801, a first driving gear 802, a first intermediate gear 803, and a first driven gear 804. The first end of the first connecting rod 801 is pivotally connected to the second end of the connecting rod 7, and the first driving gear 802 is fixedly connected to the second end of the first connecting rod 801 and pivotally connected to the vehicle body. When the link 7 drives the first connecting rod 801 to rotate, the first connecting rod 801 drives the first driving gear 802 to rotate synchronously. The first intermediate gear 803 is always engaged with the first driving gear 802, a limiting groove 805 is provided on the vehicle body, a rotating shaft of the first intermediate gear 803 passes through the limiting groove 805, and the first intermediate gear 803 can rotate relative to the vehicle body through the rotating shaft and can slide along the extending direction of the limiting groove 805. The first driven gear 804 is fixedly arranged on the rotating handle 3, and the center of the first driven gear 804 is superposed with the center of the rotation of the rotating handle 3 relative to the vehicle body. The first intermediate gear 803 has a first position and a second position, the first intermediate gear 803 being rotatable between the first position and the second position, the first intermediate gear 803 being disengaged from the first driven gear 804 when the first intermediate gear 803 is in the first position, the first intermediate gear 803 being engaged with the first driven gear 804 when the first intermediate gear 803 is in the second position, and the first intermediate gear 803 abutting against an end of the stopper groove 805.

When the foot brake pedal 5 is pressed down, the transmission process is as follows: the foot brake pedal 5 drives the first connecting rod 801 to rotate relative to the vehicle body through the connecting rod 7, the first connecting rod 801 drives the first driving gear 802 to rotate, the first driving gear 802 drives the first intermediate gear 803 to rotate, the first driving gear 802 can simultaneously drive the first intermediate gear 803 to slide along the limiting groove 805 through meshing, after the first intermediate gear 803 abuts against the end part of the limiting groove 805, the first intermediate gear 803 is meshed with the first driven wheel 804, at the moment, the first intermediate gear 803 drives the first driven wheel 804 to rotate, the first driven wheel 804 drives the rotating handle 3 to rotate, and the rotating handle 3 controls the opening degree of the engine accelerator through the second flexible shaft 4. When the brake pedal 5 is not stepped on, the first intermediate gear 803 is separated from the first driven gear 804, and the opening degree of the engine accelerator can be independently controlled by the hand accelerator handle 1. It should be noted that, in the present embodiment, the first driving gear 802 may be a sector gear, a circular gear, or the like, and the specific shape of the present embodiment is not limited.

Preferably, the limiting groove 805 is an arc groove, and the center of the limiting groove 805 coincides with the center of the first driving gear 802, which rotates relative to the vehicle body, so that when the first driving gear 802 can drive the first intermediate gear 803 to rotate along the center of the first driving gear 802, the center distance between the first driving gear 802 and the first intermediate gear 803 does not change, the transmission force between the first driving gear 802 and the first intermediate gear 803 does not change, and the transmission precision can be ensured. Of course, in other embodiments, the limiting groove 805 may be a linear groove, and it is understood that, when the first driving gear 802 drives the first intermediate gear 803 to rotate between the first position and the second position, the teeth on the first driving gear 802 are not separated from the teeth grooves of the first intermediate gear 803, and the driving force can be transmitted. Preferably, when the first intermediate gear 803 is located at the first position, the first intermediate gear 803 abuts against a first end of the limiting groove 805, and when the first intermediate gear 803 is located at the second position, the first intermediate gear 803 abuts against a second end of the limiting groove 805, so that when the first intermediate gear 803 is located at the second position, the foot brake pedal 5 is further pressed, the first intermediate gear 803 does not slide relative to the limiting groove 805, the first intermediate gear 803 only rotates in the limiting groove 805, and the first driven gear 804 is driven to rotate.

Preferably, the first intermediate gear 803 includes a coaxial small gear and a large gear, which are fixedly connected and both mounted on the rotating shaft. The first driving gear 802 is always engaged with the small gear, and when the first intermediate gear 803 is located at the second position, the large gear is engaged with the first driven gear 804. By setting the number of teeth and the radius of the small gear and the large gear, the transmission ratio of the first driving gear 802 and the first driven gear 804 can be flexibly controlled, and the relationship between the stepping amplitude of the foot brake pedal 5 and the accelerator opening variation amplitude can be conveniently adjusted.

The accelerator control system further comprises an elastic piece, a first limiting piece 9 and a second limiting piece 10, wherein the first limiting piece 9 and the second limiting piece 10 are both installed on the vehicle body, the first limiting piece 9 and the second limiting piece 10 are respectively located on two sides of the foot brake pedal 5, the foot brake pedal 5 can be respectively abutted to the first limiting piece 9 and the second limiting piece 10, the elastic piece is used for driving the foot brake pedal 5 to be abutted to the first limiting piece 9, and when the foot brake pedal 5 is not trampled, the foot brake pedal 5 is abutted to the first limiting piece 9 under the action of the elastic piece to trample the foot brake pedal 5, the foot brake pedal 5 can be abutted to the second limiting piece 10, and the lifting and trampling positions of the foot brake pedal 5 can be limited by the first limiting piece 9 and the second limiting piece 10. In this embodiment, the elastic member is a torsion spring, which applies a force to the foot brake pedal 5 to make the foot brake pedal rotate towards the first limiting member 9, so that the foot brake pedal 5 can automatically return to the original position when the foot is released after the foot brake pedal 5 is stepped on. In other embodiments, the elastic member may also be a tension spring or a compression spring. The first limiting member 9 and the second limiting member 10 are preferably adjusting bolts which are screwed to the vehicle body and fixed by nuts, and when the nuts are loosened, the positions of the adjusting bolts relative to the vehicle body can be adjusted by screwing the adjusting bolts, so that the rotation amplitude of the foot brake pedal 5 is adjusted.

Preferably, both sides of hand throttle handle 1 are equipped with third locating part and fourth locating part respectively, and hand throttle handle 1 can rotate between third locating part and fourth locating part, and through hand throttle handle 1 respectively with third locating part and fourth locating part butt for limiting the rotation range of hand throttle handle 1, and then the aperture of restriction throttle.

Referring to fig. 4 and 5, the first flexible shaft 2 includes a first rod 21, a second rod 22, a first compression spring 24 and a first stopper 25. Wherein, the first end of the first rod 21 is pivoted with the second end of the hand throttle handle 1, and the first stopper seat 25 is fixedly connected to the second end of the first rod 21 and slidably located in the box body 23. The first end of second pole 22 is connected with box 23, and can keep off the seat 25 butt with first, and the second end of second pole 22 is connected with turning handle 3, and box 23 still with the pole body sliding fit of first pole 21, first pole 21 is located to first pressure spring 24 cover, and first pressure spring 24 and second pole 22 are located the both sides that first kept off the seat 25 respectively, and the both ends of first pressure spring 24 respectively with box 23 and first fender seat 25 butt. When the hand throttle handle 1 is pulled independently, the hand throttle handle 1 pulls the first rod 21, the first rod 21 pulls the second rod 22 through the first compression spring 24 and the box body 23, and then the rotating handle 3 is pulled to rotate. When the brake pedal 5 is stepped on independently, the accelerator amount is reduced, the rotating handle 3 pulls the box body 23 through the second rod 22, the box body 23 pulls the first rod 21 through the first compression spring 24, and the first compression spring 24 is compressed, so that the position of the hand accelerator handle 1 cannot be changed.

Referring to fig. 6 and 7, the connecting rod 7 includes a third rod 71, a fourth rod 72, a second stopper 73, and a second compression spring 74. The first end of the third rod 71 is pivoted with the middle of the foot brake pedal 5, the second end of the third rod 71 is in sliding fit with the first end of the fourth rod 72, the second end of the fourth rod 72 is in selective transmission fit with the rotating handle 3 through the connecting assembly 8, the second retainer 73 is fixedly sleeved on the fourth rod 72, the second pressure spring 74 is respectively abutted against the second ends of the second retainer 73 and the third rod 71, and the first ends of the second pressure spring 74 and the fourth rod 72 are respectively positioned on two sides of the second end of the third rod 71. In this embodiment, when the foot brake pedal 5 is stepped on, the foot brake pedal 5 presses the second pressure spring 74 through the third rod 71, and the second pressure spring 74 is partially compressed, or the original length is maintained, so that the third rod 71 can be pressed to drive the first connecting rod 801 to rotate, and further the rotation handle 3 to rotate. When the pedal 5 is stepped on continuously, and the accelerator opening reaches the minimum, the rotating handle 3 cannot rotate continuously, that is, the positions of the rotating handle 3 and the connecting assembly 8 are not changed any more, and at this time, the second pressure spring 74 is compressed until the pedal 5 contacts the second limiting member 10. Damage to the stem 3, the coupling assembly 8 and the stem 3 can be prevented by the provision of the second compression spring 74. Therefore, the hand throttle handle 1 can still move in a full stroke when the hand throttle and the small throttle are braked by feet, and the electric control of the pump motor can be effectively realized through the position of the position sensor 6.

In this embodiment, the operation process of the accelerator control system is as follows.

1) Operated by a hand throttle handle 1.

The operation is carried out from a small accelerator to a large accelerator.

The foot brake pedal 5 is at the highest position under the action of the torsion spring, that is, the foot brake pedal 5 abuts against the first limiting member 9. The hand throttle handle 1 is controlled from a small throttle to a large throttle, at the moment, the hand throttle handle 1 rotates along a first direction, the hand throttle handle 1 pulls the rotating handle 3 to rotate through the first flexible shaft 2, the rotating handle 3 drives the first driven gear 804 to rotate along a second direction, the rotating handle 3 drives the second flexible shaft 4 to pull the throttle, and the opening degree of the throttle of the engine is increased. At this time, the first intermediate gear 803 and the first driven gear 804 are in a separated state, and the first driven gear 804 can be rotated by the stem 3, but since the first driven gear 804 is separated from the first intermediate gear 803, the first driven gear 804 does not transmit power in the direction of the foot brake pedal 5, the position of the foot brake pedal 5 does not change, and the output signal of the position sensor 6 does not change. In this embodiment, the second direction is opposite to the first direction, which is a counterclockwise direction of the first driven gear 804 as viewed in fig. 1.

The operation is from the big throttle to the small throttle.

The foot brake pedal 5 is in the highest position under the action of the torsion spring. Handle 1 from big accelerator toward little accelerator direction with hand throttle handle, hand throttle handle 1 rotates along the second direction, and hand throttle handle 1 is along rotating through 2 pulling shanks 3 of first flexible axle, and shanks 3 drive first driven gear 804 and rotate along first direction to shanks 3 drive 4 pulling accelerators of second flexible axle, engine throttle aperture reduces. At this time, since the first intermediate gear 803 and the first driven gear 804 are in a separated state, the first driven gear 804 does not transmit power in the direction of the foot brake pedal 5, the position of the foot brake pedal 5 does not change, and the output signal of the position sensor 6 does not change.

2) And a foot brake pedal 5 is actuated.

The foot brake pedal 5 is depressed.

The foot brake pedal 5 is stepped on to move downwards, the foot brake pedal 5 drives the first driving gear 802 to rotate through the connecting rod 7 and the first connecting rod 801, the first driving gear 802 drives the first intermediate gear 803 to rotate and slide along the limiting groove 805, when the first intermediate gear 803 abuts against the second end of the limiting groove 805, at the moment, the first intermediate gear 803 only rotates in the limiting groove 805, the first intermediate gear 803 is meshed with the first driven gear 804, and drives the first driven gear 804 to rotate along the first direction, so that the rotating handle 3 is driven to rotate, the rotating handle 3 drives the second flexible shaft 4 to adjust the accelerator, and the opening degree of the accelerator of the engine is reduced. Meanwhile, the box body 23 is pulled by the rotating handle 3 through the second rod 22, the box body 23 compresses the first compression spring 24, the first compression spring 24 is compressed, and the position of the hand throttle rotating handle 3 cannot be changed.

When the rotating handle 3 rotates to the minimum opening degree of the accelerator, the foot brake pedal 5 is continuously stepped, at this time, the positions of the rotating handle 3 and the connecting assembly 8 are not changed, the third rod 71 and the fourth rod 72 compress the second pressure spring 74, that is, the length of the connecting rod 7 is shortened, and the foot brake pedal 5 is abutted against the second limiting member 10. Therefore, the hand throttle handle 1 can still move in a full stroke when the hand throttle and the small throttle are braked by feet, and the electric control of the pump motor can be effectively realized through the position of the position sensor 6.

The foot brake pedal 5 is released from operation.

The foot brake pedal 5 moves upwards under the action of the torsion spring, in the process, if the second compression spring 74 is in a compressed state, the length of the second compression spring gradually returns to a free body, then the first connecting rod 801 can rotate, and the rotating handle 3 can rotate along the second direction until the first compression spring 24 returns to the free state. If the foot brake pedal 5 is continuously released, the rotating handle 3 does not rotate any more, the first intermediate gear 803 is gradually separated from the first driven gear 804, and the foot brake pedal 5 can continuously move upwards under the action of the torsion spring until the foot brake pedal 5 abuts against the first limiting member 9.

In the embodiment, when the accelerator of the engine is controlled to be reduced by the hand accelerator handle 1, the foot brake pedal 5 cannot be driven to act, so that the position sensor 6 cannot be indirectly used for performing electrical speed reduction control on the pump motor, and the operating efficiency of the engine in a medium-small accelerator state is improved. Meanwhile, the second pressure spring 74 is arranged to ensure that the hand throttle handle 1 can still move in a full stroke when the hand throttle handle brakes by feet when the throttle is medium or small.

Example two

Referring to fig. 8 to 14, fig. 8 is a schematic structural diagram of an oil door operating system in the second embodiment of the present invention; fig. 9 is a partial structural schematic diagram of a second throttle control system according to an embodiment of the present invention, in which a cam 812 is located at a third position (a connecting assembly 8 includes a second connecting rod 811, the cam 812 and a second driven gear 813); fig. 10 is a partial schematic structural view of a second throttle operating system according to an embodiment of the present invention, in which a cam 812 is located at a fourth position (the connecting assembly includes a second connecting rod 811, the cam 812 and a second driven gear 813); fig. 11 is a partial structural schematic diagram of a second throttle control system according to an embodiment of the present invention, in which a cam 812 is located at a third position (the connecting assembly includes a second connecting rod 811, the cam 812, a second intermediate gear 814 and a second driven gear 813); fig. 12 is a partial schematic structural view of a second throttle control system according to an embodiment of the present invention, in which a cam 812 is located at a fourth position (the connecting assembly includes a second connecting rod 811, the cam 812, a second intermediate gear 814 and a second driven gear 813); fig. 13 is a partial schematic structural view of a second throttle control system according to an embodiment of the present invention, wherein the cam 812 is located at a third position (the connecting assembly includes a second connecting rod 811, a second driving gear 815, the cam 812, a transmission gear 816, and a second driven gear 813); fig. 14 is a partial structural schematic diagram of a second throttle control system according to an embodiment of the present invention, in which a cam 812 is located at a fourth position (the connecting assembly includes a second connecting rod 811, a second driving gear 815, a cam 812, a transmission gear 816, and a second driven gear 813). The present embodiment provides a throttle control system, and the present embodiment is different from the first embodiment in that the structure of the connecting assembly 8 is different.

Referring to fig. 8, in the present embodiment, the connecting assembly 8 includes a second connecting rod 811, a cam 812 and a second driven gear 813. The first end of the second connecting rod 811 is pivoted with the second end of the connecting rod 7, the cam 812 is pivoted with the vehicle body, the second end of the second connecting rod 811 is used for driving the cam 812 to rotate, the second driven gear 813 is fixedly arranged on the rotating handle 3, the center of the second driven gear 813 is overlapped with the center of the rotating handle 3 rotating relative to the vehicle body, the cam 812 has a third position and a fourth position, the cam 812 can rotate between the third position and the fourth position, when the cam 812 is positioned at the third position, the cam 812 is not in transmission fit with the second driven gear 813, and at this time, the foot brake pedal 5 is not stepped on; when the cam 812 is located at the fourth position, the cam 812 is in transmission engagement with the second driven gear 813, and the foot brake pedal 5 is stepped on. When the foot brake pedal 5 is stepped on, the foot brake pedal 5 can drive the cam 812 to rotate from the third position to the fourth position through the connecting rod 7 and the second connecting rod 811, and when the cam 812 is located at the fourth position, the cam 812 is meshed with the second driven gear 813, the foot brake pedal 5 is further stepped on, and the cam 812 drives the second driven gear 813 to rotate, so that the opening of the engine oil valve is adjusted.

Referring to fig. 8 to 10, as one embodiment, the cam 812 is fixed to the second connecting rod 811. Preferably, the cam 812 is fixedly connected to the second end of the second connecting rod 811, in other embodiments, the cam 812 may also be fixedly connected to the middle of the second connecting rod 811, the cam 812 is provided with a base circular surface and a convex surface, the radius of the convex surface is greater than that of the base circular surface, the convex surface is provided with engaging teeth, the engaging teeth can be engaged with the second driven gear 813, and the base circular surface is in clearance fit with the second driven gear. When the foot brake pedal 5 is not stepped on, the cam 812 is located at the third position, and the base circular surface of the cam 812 is opposite to the second driven gear 813 and is in clearance fit; when the cam 812 is located at the fourth position, the convex surface is opposite to the second driven gear 813, and the meshing teeth are meshed with the second driven gear 813, so that the cam 812 and the second driven gear 813 can be selectively in transmission fit. It is understood that the distance between the center of rotation of the cam 812 and the center of rotation of the second driven gear 813 is greater than the sum of the radius of the base circle and the radius of the second driven gear 813 and equal to the sum of the tooth diameter of the second driven gear 813 and the tooth diameter of the meshing teeth.

Referring to fig. 11 and 12, as another embodiment, a cam 812 is fixed to the second connecting rod 811. Preferably, the cam 812 is fixedly coupled to the second end of the second connecting rod 811. The cam 812 is pivoted with the vehicle body, a base circle surface and a convex surface are arranged on the cam 812, and meshing teeth are arranged on the convex surface. The connecting assembly 8 further includes a second intermediate gear 814 pivotally connected to the vehicle body, the second intermediate gear 814 is engaged with the second driven gear 813, when the cam 812 is located at the third position, the base circular surface of the cam 812 is opposite to the second intermediate gear 814, and the base circular surface of the cam 812 is in clearance fit with the second intermediate gear 814, when the cam 812 is located at the fourth position, the convex surface of the cam 812 is opposite to the second intermediate gear 814, and the engaging teeth are engaged with the second intermediate gear 814, so that the cam 812 can drive the second driven gear 813 to rotate through the second intermediate gear 814.

It should be noted that in the present embodiment, the second intermediate gear 814 may be a single gear, and is engaged with the second intermediate gear 814, which is selectively engaged with the cam 812. In other embodiments, the second intermediate gear 814 may also comprise two gears, which are fixed and coaxially arranged, wherein one gear is meshed with the second driven gear 813, and the other gear is selectively meshed with the cam 812. When the second intermediate gear 814 includes two gears, the diameter of the two gears is not limited in the present embodiment, and may be set according to the actual requirement of the transmission ratio of the cam 812 to the second driven gear 813.

Since the cam 812 drives the second driven gear 813 to rotate through the second intermediate gear 814, the intermediate second intermediate gear 814 is added compared with the previous scheme, which results in that the rotation direction of the cam 812 is the same as that of the second driven gear 813, and the rotation direction of the cam 812 is opposite to that of the second driven gear 813 in the scheme that the cam 812 directly drives the second driven gear 813 to rotate. In both of these solutions, in order to realize that the rotation handle 3 rotates in the same direction when the foot brake pedal 5 is stepped on, the rotation directions of the cam 812 in both solutions need to be opposite, which can be realized by adjusting the pivot positions of the connecting rod 7 and the second connecting rod 811, that is, in both solutions, the pivot positions of the adjusting connecting rod 7 and the second connecting rod 811 are respectively located at the two sides of the connecting line direction of the pivot position of the cam 812 and the vehicle body and the pivot position of the connecting rod 7 and the foot brake pedal 5, and are oppositely arranged.

Referring to fig. 13 and 14, as another embodiment, the connecting assembly 8 further includes a second driving gear 815 and a transmission gear 816 pivotally connected to the vehicle body, wherein the second driving gear 815 is fixedly connected to a second end of the second connecting rod 811 and pivotally connected to the vehicle body. The transmission gear 816 is fixedly connected with the cam 812, the transmission gear 816 and the cam 812 are coaxially arranged, a base circular surface and a convex surface are arranged on the cam 812, meshing teeth are arranged on the convex surface, the second driving gear 815 is meshed with the transmission gear 816, the meshing teeth can be meshed with the second driving gear 815, when the cam 812 is located at the third position, the base circular surface of the cam 812 is opposite to the second driving gear 815, the base circular surface is in clearance fit with the second driving gear 815, when the cam 812 is located at the fourth position, the convex surface of the cam 812 is opposite to the second driving gear 815, and at the moment, the meshing teeth are meshed with the second driving gear 815. The second driving gear 815 may drive the second driven gear 813 to rotate via the cam 812.

It should be noted that the cam 812 in the present embodiment is not limited to the cam shape defined in the textbook, for example, the cam 812 may be a sector gear, and a solid structure portion of the sector gear may correspond to a convex surface portion of the cam 812, and a portion around the sector gear where no solid structure is provided may correspond to a base circular portion of the cam 812. It is understood that, in the entire circumferential surface of the cam 812, a part of the cam has a larger radius than the rest of the cam and can mesh with the second driven gear 813 or the second intermediate gear 814, and the rest of the cam has a clearance fit with the second driven gear 813 or the second intermediate gear 814.

In this embodiment, the operating principle of the accelerator operating system is the same as that of the first embodiment, and the detailed description is omitted here.

EXAMPLE III

The present embodiment provides a throttle control system, and the present embodiment is different from the first embodiment in that the structure of the connecting assembly 8 is different.

In this embodiment, the connecting rod 7 assembly includes a third connecting rod, a first end of the third connecting rod is pivoted with a second end of the connecting rod 7, a middle portion of the third connecting rod is pivoted with the vehicle body, and a second end of the third connecting rod is selectively in transmission fit with a second end of the rotating handle 3. The third connecting rod has a fifth position and a sixth position, when the foot brake pedal 5 is not stepped on, the third connecting rod is located at the fifth position, the second end of the third connecting rod is separated from the second end of the rotating handle 3, the foot brake pedal 5 is stepped on to drive the third connecting rod 7 to rotate from the fifth position to the sixth position, and when the third connecting rod is located at the sixth position, the second end of the third connecting rod is abutted to the second end of the rotating handle 3.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A throttle actuation system, comprising:

the hand throttle handle (1) is pivoted to the vehicle body;

the first end of the first flexible shaft (2) is connected with the hand throttle handle (1);

the second end of the first flexible shaft (2) is connected with the first end of the rotating handle (3), and the middle part of the rotating handle (3) is pivoted to the vehicle body;

the first end of the second flexible shaft (4) is connected with the second end of the rotating handle (3), and the second flexible shaft (4) is used for being connected with an engine throttle;

a foot brake pedal (5) pivoted to the vehicle body;

the first end of the connecting rod (7) is pivoted with the foot brake pedal (5);

it is characterized in that the throttle control system further comprises:

the position sensor (6) is arranged on the foot brake pedal (5), the position sensor (6) is connected with the controller, and the controller controls the current of the pump motor according to a position signal transmitted back by the position sensor (6);

coupling assembling (8), the second end of connecting rod (7) passes through coupling assembling (8) with change handle (3) selective transmission cooperation, and work as when footbrake (5) are not stepped on, connecting rod (7) pass through coupling assembling (8) with change handle (3) do not have the transmission cooperation, when stepping on during footbrake (5), connecting rod (7) pass through coupling assembling (8) with change handle (3) transmission cooperation.

2. The throttle actuation system of claim 1, characterized in that the connection assembly (8) comprises:

a first connecting rod (801), wherein a first end of the first connecting rod (801) is pivoted with a second end of the connecting rod (7);

the first driving gear (802) is fixedly connected to the first connecting rod (801) and is pivoted with the vehicle body;

the first intermediate gear (803) is always meshed with the first driving gear (802), a limiting groove (805) is formed in the vehicle body, and a rotating shaft of the first intermediate gear (803) is located in the limiting groove (805) and is in sliding fit with the limiting groove (805);

the first driven gear (804) is fixedly mounted on the rotating handle (3), the center of the first driven gear (804) coincides with the center of the rotating handle (3) rotating relative to the vehicle body, the first intermediate gear (803) has a first position and a second position, the first intermediate gear (803) can rotate between the first position and the second position, when the first intermediate gear (803) is located at the first position, the first intermediate gear (803) is separated from the first driven gear (804), when the first intermediate gear (803) is located at the second position, the first intermediate gear (803) is meshed with the first driven gear (804), and the rotating shaft of the first intermediate gear (803) abuts against the end of the limiting groove (805).

3. The throttle actuation system of claim 2, wherein the first intermediate gear (803) comprises a coaxial pinion and a bull gear, the bull gear being grounded to the pinion, the first drive gear (802) being in constant mesh with the pinion, the bull gear being in mesh with the first driven gear (804) when the first intermediate gear (803) is in the second position.

4. The throttle control system according to claim 2, wherein the limiting groove (805) is a circular arc groove, and a center of the limiting groove (805) coincides with a center of rotation of the first driving gear (802) relative to the vehicle body.

5. The throttle actuation system of claim 1, characterized in that the connection assembly (8) comprises:

a second connecting rod (811), a first end of the second connecting rod (811) being pivotally connected to the connecting rod (7);

the cam (812) is pivoted to the vehicle body, and the second connecting rod (811) is used for driving the cam (812) to rotate;

the second driven gear (813) is fixedly mounted on the rotating handle (3), the center of the second driven gear (813) coincides with the center of the rotating handle (3) relative to the rotation of the vehicle body, the cam (812) has a third position and a fourth position, the cam (812) can rotate between the third position and the fourth position, when the cam (812) is located at the third position, the cam (812) is not in transmission fit with the second driven gear (813), and when the cam (812) is located at the fourth position, the cam (812) is in transmission fit with the second driven gear (813).

6. The throttle actuation system of claim 5, characterized in that the connecting assembly (8) further comprises a second intermediate gear (814) pivoted to the vehicle body, the second intermediate gear (814) being in mesh with the second driven gear (813), the cams (812) having meshing teeth on both convex surfaces, the base circle surface of the cam (812) being opposite to the second intermediate gear (814) when the cam (812) is in the third position, and the base circle surface of the cam (812) being in clearance fit with the second intermediate gear (814), the meshing teeth being in mesh with the second intermediate gear (814) when the cam (812) is in the fourth position.

7. The throttle actuation system of claim 1, wherein the connecting assembly (8) further comprises a third connecting rod, a first end of the third connecting rod is pivotally connected to the second end of the connecting rod (7), a middle portion of the third connecting rod is pivotally connected to the vehicle body, the third connecting rod has a fifth position and a sixth position, the second end of the third connecting rod is separated from the second end of the rotation handle (3) when the third connecting rod is located at the fifth position, and the second end of the third connecting rod is abutted to the second end of the rotation handle (3) when the third connecting rod is located at the sixth position.

8. The throttle actuation system according to any one of claims 1 to 7, characterized in that the first flexible shaft (2) comprises:

a first rod (21), wherein a first end of the first rod (21) is connected with the hand throttle handle (1);

a box (23) in sliding fit with the first rod (21);

the first pressure spring (24) is sleeved on the first rod (21);

the first baffle seat (25) is fixedly connected to the second end of the first rod (21) and is positioned in the box body (23) in a sliding manner;

second pole (22), the first end of second pole (22) with box (23) are connected, the second end of second pole (22) with turning handle (3) are connected, first pressure spring (24) with second pole (22) are located respectively the both sides of first fender seat (25), the both ends of first pressure spring (24) respectively with box (23) with first fender seat (25) butt.

9. The throttle actuation system according to any one of claims 1 to 7, wherein the link (7) comprises a third rod (71), a fourth rod (72), a second stop (73) and a second compression spring (74); the first end of third pole (71) with the pin joint of foot brake pedal (5), the second end of third pole (71) with the first end sliding fit of fourth pole (72), the second end of fourth pole (72) is passed through coupling assembling (8) with turning handle (3) selective transmission cooperation, the second keeps off seat (73) and is fixed in fourth pole (72), second pressure spring (74) cover is located fourth pole (72), second pressure spring (74) respectively with the second keeps off seat (73) with the second end butt of third pole (71), second pressure spring (74) with the first end of fourth pole (72) is located respectively the both sides of the second end of third pole (71).

10. The throttle operating system according to any one of claims 1 to 7, further comprising an elastic member, a first limiting member (9) and a second limiting member (10), wherein the first limiting member (9) and the second limiting member (10) are both mounted on the vehicle body, the first limiting member (9) and the second limiting member (10) are respectively located at two sides of the foot brake pedal (5), and the foot brake pedal (5) can be respectively abutted against the first limiting member (9) and the second limiting member (10), the elastic member is used for driving the foot brake pedal (5) to abut against the first limiting member (9), and when the foot brake pedal (5) is not stepped, the foot brake pedal (5) abuts against the first limiting member (9).