CN110094501B - A device of cutting off gas in advance for helping hand system of shifting - Google Patents

Abstract

The invention relates to an early gas cut-off device for a gear shift assist system, comprising a shift trigger block, a fixed seat, a trigger switch, a trigger jack and an electromagnetic control valve. The shift trigger block is fixed on a shift shaft, and the shift trigger The top of the block is provided with a neutral gear groove, and the two sides of the neutral gear groove are correspondingly provided with a front gear arc protrusion and a rear gear arc protrusion; the fixed seat is fixed on the upper side of the shift trigger block, and the trigger switch It is fixed on the fixed seat, the triggering mandrel is arranged in the guide hole of the fixed seat, the upper end of the triggering mandrel is located on the lower side of the contact pin of the trigger switch, the lower end of the triggering mandrel is in the neutral position groove, and the electromagnetic control valve is a normally open type. The two-position three-way solenoid valve is connected in series with the trigger switch between the positive and negative poles of the vehicle power supply. The air inlet P of the solenoid control valve is connected to the air source, the air outlet A is connected to the shift booster system, and the exhaust port T communicates with the atmosphere. It has the advantages of simple structure, low cost, sensitive action, high precision and strong practicability.

Description

A kind of early gas cut-off device for shift assist system

technical field

The invention relates to a gear shift assist system, in particular to an early gas cut-off device for the gear shift assist system.

Background technique

With the development of vehicle technology, people have higher and higher requirements for driving comfort. The ease of shifting is an important indicator for evaluating driving comfort. For heavy-duty vehicles, the shifting mechanism is heavier when shifting gears, the shifting force required is large, and the labor intensity of the driver is high, which has attracted more and more attention in the industry. At present, the synchronizer is usually used in the art to solve the phenomena such as impact and tooth punching during shifting, and the shifting force is reduced by adding a shifting assist system to improve the portability of shifting. The gearboxes of heavy vehicles mostly use gas-acting high-low gear conversion auxiliary boxes, and the gearbox shift assist system generally adopts the form of gas assist. The boosting effect of the shifting power assist system is mainly reflected in the timing of boosting action. The timing of boosting action is advanced, and it is easy to cause the clutch to work before it is completely disengaged, which will increase the load of the synchronizer and seriously affect its life; and the timing of boosting action is delayed, No shift assist. To this end, the art uses the clutch disengagement complete signal to control the opening timing of the shift assist system, that is, after the clutch disengagement is complete, a signal is provided to the shift assist system to enable the air assist to activate, so as to realize the air assist after the clutch disengagement is complete. action. Although this method solves the problem of the timing of assist opening, the timing for ending the assist is when the clutch is engaged. During the shifting process, a larger shifting force is required only during the synchronization process of the synchronizer. After the synchronization process of the synchronizer is completed, if the shift assist has not ended before the synchronizer sleeve and the ring gear are engaged, it will be in the synchronization process. During the meshing process of the gear sleeve and the ring gear, the collision and secondary impact between the locking surfaces will occur, which will also affect the performance and life of the synchronizer. Furthermore, there is no technology in the art to precisely control the timing of the end of the assist of the shift assist system.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an early gas cut-off device for a shift assist system, which has the advantages of simple structure, low cost, sensitive action, high accuracy, and strong practicability, and realizes the end of assisting the shift assist system. The technical purpose of precise control of timing.

In order to solve the above problems existing in the prior art, the present invention provides an early gas cut-off device for a shift assist system, which includes a shift trigger block, a fixed seat, a trigger switch, a trigger jack and an electromagnetic control valve. The shift trigger block is fixed on the shift shaft of the gearbox. The top of the shift trigger block is provided with a neutral gear groove whose notch width is greater than the width of the groove bottom. Both sides of the neutral gear groove are correspondingly provided with front gear arcs. The bulge and the rear gear arc bulge; the fixed seat is fixed on the upper side of the shift trigger block; the trigger switch is a normally open switch, and the trigger switch is fixed on the fixed seat with its contact pin facing downward; The triggering mandrel is arranged in the guide hole provided on the lower side of the triggering switch by the fixed seat, the upper end of the triggering mandrel is located on the lower side of the contact pin of the triggering switch, and the lower end of the triggering mandrel is located in the neutral position groove of the shift trigger block. The electromagnetic control valve is a normally open two-position three-way electromagnetic valve, and it is connected in series with the trigger switch between the positive and negative poles of the vehicle power supply, the air inlet P of the electromagnetic control valve is connected to the air source, and the electromagnetic control The air outlet A of the valve is connected with the shift assist system, and the exhaust port T of the electromagnetic control valve is communicated with the atmosphere.

Further, the present invention is an early air cut-off device for a shift assist system, wherein the front gear arc protrusion and the rear gear arc protrusion are symmetrical structures, and are corresponding to the neutral gear groove. The two side walls are connected by a smooth transition.

Further, the present invention is an early air cut-off device for a shift power assist system, wherein the distance between the lower end of the contact pin of the trigger switch and the upper end of the trigger ejector rod is x, and the center point of the groove bottom of the neutral gear groove is x. The connection line of the shift shaft axis is m1, the length of m1 is r1, the connection line from the starting point of the arc-shaped protrusion of the front gear to the shift shaft axis is m2, the length of m2 is r2, and the distance between m2 and m1 is m2. The included angle is α; r2-r1-x=y, y represents the triggering stroke of the trigger switch, α-θ=Δα, Δα=1°～2°, θ represents the rotation angle of the shift shaft corresponding to the synchronizing stroke of the synchronizer.

Further, the present invention is an early air cut-off device for a shift power assist system, wherein the connection line between the end point of the arc-shaped protrusion of the front gear and the axis of the shift shaft is m3, and the clip between m2 and m1. The angle is β, β≥δ, and δ represents the rotation angle of the shift shaft corresponding to the shifting stroke.

Further, the present invention provides an early gas cut-off device for a shift assist system, wherein the α is 12°˜15°, and the β is 20°˜25°.

Further, the present invention provides an early air cut-off device for a shift assist system, wherein the triggering ejector rod is slidably matched with the peripheral wall of the guide hole on the fixed seat, and the peripheral wall of the triggering ejector rod is axially provided with a ventilation groove.

Further, the present invention provides an early air cut-off device for a shift assist system, wherein the lower end of the triggering ejector rod is a spherical head, and the upper end of the triggering ejector rod is a flat head.

Further, the present invention is an early air cut-off device for a shift assist system, wherein the groove bottom of the neutral gear groove is a flat bottom, and the convex surface of the front gear arc convex is a shift shaft. Cylinder for the axis.

Further, the present invention provides an early air cut-off device for a shift assist system, wherein the trigger switch is screwed into a threaded hole provided on the upper side of the guide hole of the fixed seat.

Further, the present invention is an early gas cut-off device for a gear shift assist system, wherein the trigger switch is provided with a limit octagonal head at the upper position of the fixed seat, and a distance adjustment is arranged between the limit octagonal head and the fixed seat. gasket.

Compared with the prior art, the present invention has the following advantages: the present invention provides a shift trigger block, a fixed seat, a trigger switch, a trigger ejector rod and an electromagnetic control valve, and the The gear trigger block is fixed on the shift shaft of the gearbox, and a neutral gear groove with a notch width greater than the width of the groove bottom is set on the top of the gear shift trigger block, and a front gear arc is correspondingly set on both sides of the neutral gear groove. Bump and rear gear arc bulge; fix the fixed seat on the upper side of the shift trigger block; make the trigger switch a normally open switch, and fix the trigger switch on the fixed seat with the contact pin facing down; Set the triggering mandrel in the guide hole provided on the lower side of the trigger switch, so that the upper end of the triggering mandrel is located on the lower side of the contact pin of the triggering switch, and the lower end of the triggering mandrel is in the neutral position of the shift trigger block. In the groove; let the electromagnetic control valve use a normally open two-position three-way electromagnetic valve, and connect it in series with the trigger switch between the positive and negative poles of the vehicle power supply, and connect the air inlet P of the electromagnetic control valve to the air source. Connect the air outlet A of the solenoid control valve to the shift assist system, and let the exhaust port T of the solenoid control valve communicate with the atmosphere. As a result, an early gas cut-off device for a shift assist system is formed, which is simple in structure, low in cost, sensitive in action, high in accuracy and strong in practicability. In practical applications, when the gearbox is in the neutral position, the neutral position groove of the shift trigger block is facing the trigger ejector rod, and the lower end of the trigger ejector rod is in the neutral position groove under the action of gravity. There is a gap between the contact pins of the trigger switch, the trigger switch is not turned on, and the electromagnetic control valve is not energized and is in a normally open state. The air inlet P and air outlet A of the electromagnetic control valve enter the shift assist system, and the shift assist system can normally provide shift assist. When the driver manipulates the shift mechanism to shift gear forward, the shift trigger block will rotate along with the shift shaft, and press the lower end of the trigger ejector rod to move linearly along the axis; When the position groove moves to the starting point of the arc-shaped protrusion of the front gear, the triggering rod gradually moves upward until the contact needle of the trigger switch is pressed to make it trigger and turn on; after the trigger switch is turned on, the electromagnetic control valve is energized and is in a closed state. , the air inlet P is separated from the air outlet A, the air outlet A is connected with the exhaust port T, and the shift assist system is separated from the air source and loses the shift assist. In this way, the center angle between the starting point of the arc-shaped protrusion of the front gear and the center point of the groove bottom of the neutral gear groove with the shift shaft as the center of the circle is the size of the circle, and the shift shaft corresponding to the synchronizing stroke of the synchronizer rotates The angle matching setting can control the timing of the end of the power assist of the shift assist system after the synchronization process of the synchronizer is completed, and before the gear sleeve of the synchronizer meshes with the ring gear. The principle and process of shifting gears backwards and shifting gears forwards are the same, and will not be repeated here. The invention realizes precise control of the timing of the end of the booster, solves the problem that the synchronizer is continuously acted by the shift booster and causes secondary impact in the prior art, improves the comfort and portability of shifting, and ensures the safety of the synchronizer sturdiness and reliability.

The following is a further detailed description of an early gas cut-off device for a shift assist system of the present invention in conjunction with the specific embodiments shown in the accompanying drawings.

Description of drawings

Fig. 1 is a state schematic diagram of an early gas cut-off device used in a shift assist system of the present invention when it is in neutral;

Fig. 2 is a state schematic diagram of an early gas cut-off device used in a shift assist system of the present invention when it is geared forward;

FIG. 3 is a state schematic diagram of an early gas cut-off device for a shift assist system according to the present invention when the gear is engaged in the rear.

Detailed ways

First of all, it should be noted that the orientation words such as upper, lower, left, right, front and rear described in the present invention are only descriptions according to the accompanying drawings, for ease of understanding, rather than limiting the technical solutions of the present invention and the scope of protection claimed. .

As shown in FIG. 1 to FIG. 3 , a specific embodiment of an early air cut-off device for a shift assist system of the present invention includes a shift trigger block 1 , a fixed seat 2 , a trigger switch 3 , a trigger jack 4 and an electromagnetic control valve 5. Fix the shift trigger block 1 on the shift shaft 6 of the gearbox, and set a neutral gear groove 11 with a notch width greater than the width of the groove bottom on the top of the shift trigger block 1, on both sides of the neutral gear groove 11 Correspondingly, the front suspension arc protrusion 12 and the rear suspension arc protrusion 13 are correspondingly provided. Fix the fixing base 2 on the upper side of the shift trigger block 1 . The trigger switch 3 is a normally open type switch, and the trigger switch 3 is fixed on the fixing base 2 with the contact pin 31 facing downward. The triggering mandrel 4 is arranged in the guide hole provided on the lower side of the triggering switch 3 of the fixing seat 2, so that the upper end of the triggering mandrel 4 is located on the lower side of the contact pin 31 of the triggering switch 3, and the lower end of the triggering mandrel 4 is in the replacement position. in the neutral position groove 11 of the blocking trigger block 1 . Let the electromagnetic control valve 5 use a normally open two-position three-way electromagnetic valve, and connect the electromagnetic control valve 5 and the trigger switch 3 in series between the positive and negative poles of the vehicle power supply, so that the air inlet P of the electromagnetic control valve 5 is connected to the air supply. The source is connected, so that the outlet A of the electromagnetic control valve 5 is connected to the shift assist system, and the exhaust port T of the electromagnetic control valve 5 is communicated with the atmosphere.

Through the above structure arrangement, an early gas cut-off device for a shift assist system is formed, which is simple in structure, low in cost, sensitive in action, high in accuracy and strong in practicability. In practical applications, when the gearbox is in the neutral position, the neutral position groove 11 of the shift trigger block 1 is facing the trigger jack 4, and the lower end of the trigger jack 4 is in the neutral position groove 11 under the action of gravity. When there is a gap between the trigger ejector rod 4 and the contact pin 31 of the trigger switch 3, the trigger switch 3 is not turned on, the electromagnetic control valve 5 is not energized and is in a normally open state, the air inlet P is in communication with the air outlet A, and the air outlet A Separated from the exhaust port T, the air source enters the shift assist system through the air inlet P and the air outlet A of the electromagnetic control valve 5, and the shift assist system can normally provide shift assist. When the driver manipulates the shift mechanism to shift forward, the shift trigger block 1 will rotate along with the shift shaft 6, and press the lower end of the trigger jack 4 to make a linear movement along the axis. During the movement of the lower end of the triggering ejector rod 4 from the neutral position groove 11 to the starting point of the front gear arc protrusion 12, the triggering ejector rod 4 gradually moves upwards until the contact pin 31 of the trigger switch 3 is pressed to make the triggering switch on. After the trigger switch 3 is turned on, the electromagnetic control valve 5 is energized and is in a closed state, the air inlet P is separated from the air outlet A, the air outlet A is connected with the exhaust port T, and the shift assist system is cut off from the air source and loses the shift assist. . In this way, the size of the central angle between the starting point of the arc-shaped protrusion 12 of the front gear and the center point of the groove bottom of the neutral gear groove 11 with the shift shaft 6 as the center of the circle is the size of the center angle corresponding to the synchronizing stroke of the synchronizer. The matching setting of the rotation angle of the gear shaft can control the timing of the end of the assist of the shift assist system after the synchronization process of the synchronizer is completed, and before the gear sleeve of the synchronizer meshes with the ring gear. The principle and process of shifting gears backwards and shifting gears forwards are the same, and will not be repeated here. The invention realizes precise control of the timing of the end of the booster, solves the problem that the synchronizer is continuously acted by the shift booster and causes secondary impact in the prior art, improves the comfort and portability of shifting, and ensures the safety of the synchronizer sturdiness and reliability. It should be noted that, in practical application, the front suspension arc protrusion 12 and the rear suspension arc protrusion 13 are symmetrical structures, and the front suspension arc protrusion 12 and the rear suspension arc protrusion 13 are made of symmetrical structures. Correspondingly, the two side walls of the neutral gear groove 11 are connected with a smooth transition, so as to enhance the smoothness and continuity of the movement of the trigger jack 4 during the shifting process.

As a specific embodiment, if the gap distance between the lower end of the contact pin 31 of the trigger switch 3 and the upper end of the trigger ejector rod 4 is represented by x, the line connecting the center point a of the groove bottom of the neutral position groove 11 to the axis of the shift shaft 6 It is represented by m1, the length of m1 is represented by r1, the connecting line from the starting point b of the arc-shaped protrusion 12 of the front gear to the axis of the shift shaft 6 is represented by m2, the length of m2 is represented by r2, and the clip between m2 and m1 is represented by m2. The angle is represented by α (the center angle between the starting point b of the arc-shaped protrusion 12 of the front gear and the center point a of the groove bottom of the neutral gear groove 11 with the shift shaft 6 as the center of the circle), the present invention should let r2-r1- x=y, where y represents the trigger stroke of the trigger switch 3, so that the trigger switch 3 can be reliably triggered and turned on when the lower end of the trigger ejector rod 4 moves from the neutral position groove 11 to the starting point of the front gear arc protrusion 12, And let α-θ=Δα, where Δα is 1° to 2°, and θ represents the rotation angle of the shift shaft corresponding to the synchronizing stroke of the synchronizer, so as to ensure that the timing of the end of the assist of the shift assist system is after the synchronization process of the synchronizer ends. And before the gear sleeve of the synchronizer meshes with the ring gear, the phenomenon of collision and secondary impact caused when the gear sleeve of the synchronizer and the ring gear are meshed with the gear shift assist is effectively avoided. In addition, if the connecting line from the end point c of the front gear arc protrusion 12 to the axis of the shift shaft is represented by m3, and the angle between m2 and m1 is represented by β (the end point c of the front gear arc protrusion 12 The center angle between the center point a of the groove bottom of the groove 11 and the center point a of the groove bottom of the neutral gear groove 11 with the shift shaft 6 as the center of the circle), the present invention usually sets β≥δ, where δ represents the rotation angle of the shift shaft corresponding to the gear-shifting stroke, so as to ensure The arc length between the starting point b and the ending point c of the front gear arc protrusion 12 meets the requirements of the gear shifting stroke. It should be noted that, in the present invention, α is usually designed to be 12° to 15°, and β is designed to be 20° to 25° to match the rotation angle of the shift shaft corresponding to the synchronous stroke and the gear shifting stroke. The synchronizer and shift mechanism are adapted to adjust.

As an optimized solution, in this specific embodiment, by sliding the triggering plunger 4 with the peripheral wall of the guide hole on the fixing base 2, the triggering plunger 4 is provided with a ventilation groove 41 on its peripheral wall along the axial direction, so as to enhance the triggering plunger 4 On the basis of the smooth movement along the axial direction, the action sensitivity and precision of the early gas cut-off device are improved. The lower end of the trigger ejector rod 4 adopts a spherical head to enhance the smoothness and continuity of its movement, and the upper end of the trigger ejector rod 4 adopts a flat head to ensure the reliability of pressing the contact pin 31 . At the same time, in this specific embodiment, the trigger switch 3 is screwed into the threaded hole provided on the upper side of the guide hole of the fixed seat 2, which improves the convenience of disassembly and assembly, and the trigger switch 3 is arranged on the upper side of the fixed seat 2. The limit octagonal head 32 is provided, and a distance adjustment gasket 33 is arranged between the limit octagonal head 32 and the fixed seat 2. The distance increases the scope of application of the early gas cut-off device. In addition, in the present invention, the groove bottom of the neutral position groove 11 is formed with a flat bottom, so as to simplify the structure and the manufacturing process.

It should be noted that, in the present invention, the convex surfaces of the front gear arc protrusion 12 and the rear gear arc protrusion 13 are cylindrical surfaces with the shift shaft as the axis. The above content mainly describes the front gear arc-shaped protrusion 12 and the control process of the timing of the end of the assist when the front gear is engaged, and the rear-gear arc-shaped protrusion 13 is arranged in a symmetrical structure with the front-mounted gear arc-shaped protrusion 12 , the backward shifting process is exactly the same as the forward shifting process.

The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of protection of the present invention. Without departing from the design concept of the present invention, those skilled in the art can make various Deformations shall fall within the protection scope determined by the claims of the present invention.

Claims (10)

1. The advanced gas cut-off device for the gear shifting power-assisted system is characterized by comprising a gear shifting trigger block (1), a fixed seat (2), a trigger switch (3), a trigger ejector rod (4) and an electromagnetic control valve (5), wherein the gear shifting trigger block (1) is fixed on a gear shifting shaft of a gearbox, a neutral gear groove (11) with the width of a notch larger than the width of the bottom of a gear is formed in the top of the gear shifting trigger block (1), and a front gear engaging arc-shaped bulge (12) and a rear gear engaging arc-shaped bulge (13) are correspondingly arranged on two sides of the neutral gear groove (11); the fixed seat (2) is fixed on the upper side of the gear shifting trigger block (1); the trigger switch (3) is a normally-open switch, and the trigger switch (3) is fixed on the fixed seat (2) and leads a contact pin (31) of the trigger switch to face downwards; the trigger ejector rod (4) is arranged in a guide hole formed in the fixed seat (2) on the lower side of the trigger switch (3), the upper end of the trigger ejector rod (4) is located on the lower side of a contact pin (31) of the trigger switch (3), and the lower end of the trigger ejector rod (4) is located in a neutral position groove (11) of the gear shifting trigger block (1); the electromagnetic control valve (5) is a normally open two-position three-way electromagnetic valve and is connected with the trigger switch (3) in series between the positive electrode and the negative electrode of a vehicle power supply, an air inlet P of the electromagnetic control valve (5) is connected with an air source, an air outlet A of the electromagnetic control valve (5) is connected with a gear shifting assisting system, and an air outlet T of the electromagnetic control valve (5) is communicated with the atmosphere.

2. The early air-break device for a shift assist system according to claim 1, wherein the front shift arch (12) and the rear shift arch (13) are symmetrical and are smoothly transitionally connected with two side walls of the neutral groove (11).

3. The early air-break device for the shift assist system as claimed in claim 2, wherein the distance between the lower end of the contact pin (31) of the trigger switch (3) and the upper end of the trigger push rod (4) is x, the connecting line from the center point of the groove bottom of the neutral groove (11) to the axis of the shift shaft is m1, the length of m1 is r1, the connecting line from the starting point of the front gear arc-shaped protrusion (12) to the axis of the shift shaft is m2, the length of m2 is r2, the included angle between m2 and m1 is α, r2-r 1-x-y represents the trigger stroke of the trigger switch (3), α -theta-delta α, delta α -1-352 deg, and theta represents the rotation angle of the shift shaft corresponding to the synchronous stroke of the synchronizer.

4. The early air-break device for a shift assist system as set forth in claim 3, wherein a line connecting the end point of the front shift arc protrusion (12) to the axis of the shift shaft is m3, and the angle between m2 and m1 is β ≧ which indicates the rotation angle of the shift shaft corresponding to the shift stroke.

5. The early gas cutoff device for a shift assist system as set forth in claim 4 wherein said α is 12 ° to 15 ° and said β is 20 ° to 25 °.

6. The early air-break device for the shift assist system according to any one of claims 1 to 5, wherein the trigger push rod (4) is in sliding fit with the peripheral wall of the guide hole on the fixed seat (2), and the peripheral wall of the trigger push rod (4) is provided with an air vent groove (41) along the axial direction.

7. The early air-break device for the shift assist system according to any one of claims 1 to 5, wherein the lower end of the trigger push rod (4) is a spherical head, and the upper end of the trigger push rod (4) is a flat head.

8. The early air-break device for a shift assist system according to any one of claims 1 to 5, wherein the groove bottom of the neutral recess (11) is a flat bottom, and the convex surface of the front engaging arc-shaped protrusion (12) is a cylindrical surface with the shift shaft as the axis.

9. An early blow-off device for a shift assist system according to any one of claims 1 to 5, characterized in that the trigger switch (3) is screwed into a threaded hole provided in the holder (2) at an upper side of the guide hole.

10. The early air-break device for a shift assist system according to claim 9, wherein the trigger switch (3) is provided with a limit octagon head (32) at an upper side position of the fixed seat (2), and a distance adjusting gasket (33) is arranged between the limit octagon head (32) and the fixed seat (2).

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