WO2019080470A1

WO2019080470A1 - Two-gear intermediate shaft transmission structure

Info

Publication number: WO2019080470A1
Application number: PCT/CN2018/085152
Authority: WO
Inventors: 陈步高; 张栋梁; 曹福顺
Original assignee: 盐城市步高汽配制造有限公司
Priority date: 2017-10-25
Filing date: 2018-04-28
Publication date: 2019-05-02
Also published as: CN207406719U

Abstract

A compact two-gear transmission. The two-gear transmission comprises an input shaft, a first-shaft intermediate assembly, a second-gear intermediate shaft assembly, an output shaft assembly, and a differential mechanism. Power of a drive motor is transmitted to a housing by the input shaft, and a first-gear intermediate shaft assembly and the second-gear intermediate shaft assembly are connected to the housing by a clutch structure at the corresponding gears and transmit power. A first-gear intermediate shaft gear and a first-gear gear of an output shaft are constantly engaged, a second-gear intermediate shaft gear and a second-gear gear of the output shaft are constantly engaged, and power is transmitted at the corresponding gears. According to the transmission, no friction is generated in a gear shifting process, few components are adopted, impact is weak in the gear shifting process, reliability is high, the output power and the mechanical performance can be improved, and various properties of electric vehicles are greatly improved.

Description

Two-speed intermediate shaft transmission structure

Technical field

The utility model belongs to the technical field of vehicle transmissions, in particular to a two-speed intermediate shaft transmission structure.

Background technique

As a new generation of vehicles, electric vehicles have a great advantage over traditional fuel vehicles in terms of energy saving and emission reduction and the creation of green homes.

The traditional single-shaft transmission arrangement mostly adopts the form that the intermediate shaft assembly is disposed directly below the input shaft and the output shaft assembly. Although it is convenient to arrange the power output device such as the power take-off device, it also has some disadvantages: the intermediate shaft assembly is disposed at When the input shaft and the output shaft are directly below, the operating device can only be placed directly above the output shaft assembly, so that the height of the transmission assembly is high, which poses certain difficulties for the entire vehicle layout.

Some manufacturers try to solve the above problem by connecting a two-speed transmission to the rear end of the original direct-drive motor. The two-speed transmission can automatically shift the vehicle without interruption, making driving easier and more convenient. It can improve the comfort, power and safety of the car. However, the two-speed transmission of pure electric vehicles on the market has the problems of high height, heavy weight and high cost, which cannot be promoted on a large scale.

Utility model content

In order to solve the above problems, the utility model discloses a two-speed intermediate shaft transmission structure, which has low height, light weight, high transmission efficiency, no power interruption during shifting, higher reliability, compact overall arrangement and more adaptability. it is good.

In order to achieve the above object, the technical solution of the present invention is as follows:

A two-speed intermediate shaft transmission structure, comprising: a first intermediate shaft assembly, a second intermediate shaft assembly, an input shaft, a housing, an output shaft assembly, and a differential; The utility model comprises: a first intermediate shaft and a first intermediate shaft gear coaxially mounted and fixedly connected to the first intermediate shaft, an upper transfer baffle and a lower transfer baffle; and the second intermediate shaft assembly includes a second gear intermediate a shaft and a second-speed countershaft gear, an electromagnet and a shift pin fixedly coupled to the second-speed intermediate shaft; the input shaft is coupled to the front end of the housing; the housing, the first intermediate shaft assembly and the second intermediate shaft Coaxially mounted, and the clutch driven disc of the first intermediate shaft assembly is located in the housing, and the clutch driven disc of the second intermediate shaft assembly is located at the rear end of the outer casing; the output shaft assembly includes: coaxial Installing and fixing an output shaft first gear, an output shaft second gear and an output shaft drive gear connected to the output shaft; the first gear of the output shaft is constantly meshed with the first intermediate gear; the second gear of the output shaft and the second gear The countershaft gear is always meshed; the output shaft is actively toothed Output gear constantly meshed with the differential.

As an improvement of the present invention, the input shaft is coaxially mounted and fixedly coupled to an output shaft of the drive motor, and the input shaft is coaxially mounted and fixedly coupled to the housing.

As an improvement of the utility model, an upper transfer baffle, a lower transfer baffle and a first countershaft gear are distributed along the axial direction of the first gear intermediate shaft, wherein the upper transfer baffle and the lower transfer case The baffle and the first intermediate shaft are coaxially connected by the deep groove ball bearing, and the first intermediate shaft gear is coaxially fixedly connected with the first intermediate shaft.

As an improvement of the utility model, the axial position of the second-speed intermediate shaft assembly is determined by the relative positions of the shift pin and the upper transfer baffle and the lower transfer baffle in different gear positions; The stop pin is located on the upper side of the lower transfer baffle, and the lower side of the upper transfer baffle is lifted in contact with the lower transfer baffle; in the first gear, the shift pin is located on the upper side of the upper transfer baffle And not in contact with the upper transfer baffle; in the second gear, the shift pin is located on the upper side of the lower transfer baffle, on the lower side of the upper transfer baffle, and is pressed down in contact with the upper transfer baffle tight.

As an improvement of the utility model, the movable distance of the shift pin in the upper transfer baffle and the lower transfer baffle is smaller than the clutch driven disc of the first intermediate shaft assembly to the clutch active disc inside the housing The maximum spacing.

As an improvement of the utility model, the shift pin is a cylinder whose head is a hemisphere, and the tail portion is connected to the electromagnet through a spring, and the circular through hole on the cylinder and the second gear intermediate shaft is a clearance fit.

As an improvement of the present invention, the electromagnet is mounted on a cylindrical wall surface on the inner side of the second-speed intermediate shaft, and the mounting position is on the axis of the shift pin.

As an improvement of the present invention, the second intermediate shaft has a structure as shown in Fig. 5, and two cylindrical through holes in the interior thereof are used to mount the shift pin.

As an improvement of the utility model, the shift control is realized by the electromagnet controlling the expansion and contraction of the shift pin, and the specific shifting method and power transmission route are.

1. Neutral, the electromagnet is de-energized, the shift pin is located between the upper transfer baffle and the lower transfer baffle, and is in the pop-up state; at this time, the second-speed intermediate shaft assembly is lifted by the lower transfer baffle because The clutch disc of the second intermediate shaft is not in contact with the clutch active disc at the rear end of the housing; the clutch driven disc of the first intermediate shaft is also not in contact with the clutch active disc inside the housing; no power transmission is performed at this time;

2. In the first gear, the electromagnet is energized to draw the shift pin head into the cylindrical hole of the second gear intermediate shaft. At this time, the middle axial direction of the first gear moves downward until the clutch disc of the first intermediate shaft and the clutch inside the housing are actively activated. The disk is in contact with and compacted; the power transmission route at this time is: drive motor, housing, first gear intermediate shaft, first gear intermediate shaft gear, output shaft first gear, output shaft, output shaft drive gear, differential;

3. The second gear, the first cylindrical hole that moves to the second intermediate shaft in the middle axial direction is located between the upper transfer baffle and the lower transfer baffle. At this time, the electromagnet is cut off and the shift pin is ejected. The intermediate shaft moves downward again until the upper transfer baffle contacts and presses the shift pin. Due to the axial force from the shift pin, the clutch disc of the second intermediate shaft contacts the clutch active disc at the rear end of the housing and Pressing, the power transmission route at this time is: drive motor, housing, second gear intermediate shaft, second gear intermediate shaft gear, output shaft second gear, output shaft, output shaft drive gear, differential.

As an improvement of the present invention, the tooth width of the first-stage countershaft gear is increased, so that the gear can be fully meshed when shifting.

As an improvement of the utility model, the gear width of the second-speed countershaft gear is increased, so that the gear shifting can still be fully engaged when shifting.

As a further improvement of the present invention, the shifting tooth hub is fixed to the output shaft, and the first gear cylinder includes a first driving gear and a driven gear, and the first driven gear rotates. Arranged outside the first gear carrier; the second gear spur gear pair includes a second gear drive gear and a second gear driven gear, and the second gear driven gear is disposed to rotate outside the second gear wheel hub.

As a further improvement of the present invention, the inner input shaft of the input shaft assembly is provided with a mounting groove on the inner hole, and the inner input shaft is provided with a matching mounting groove. The needle bearing support is mounted on the mounting slot and is matched for installation. In the slot.

As a further improvement of the present invention, the input shaft adopts a combination of a shaft and a column, and the shaft and the column are integrally formed, and the first gear of the driving gear and the cylinder of the input shaft are also integrally formed.

As a further improvement of the utility model, the front end shaft of the first intermediate shaft is supported in the inner hole of the motor main shaft, and the motor main shaft is supported on the rear end cover of the motor through the rear end bearing of the motor.

As a further improvement of the present invention, the first intermediate shaft is supported by a deep groove ball bearing disposed on the front casing, the deep groove ball bearing is mounted on a shaft, and is axially positioned by the snap ring and passes through the first gear. Intermediate shaft bearing cap, deep groove ball bearing outer ring snap ring, front shell end face for installation and positioning.

Compared with the prior art, the utility model has the following beneficial effects:

1. The mechanical parts are used for shifting. There is no mechanical friction and fewer parts during the shifting process, which makes the transmission have higher transmission efficiency than the current transmission structure.

2. The double intermediate shaft double clutch structure with coaxial arrangement is adopted, the axial space size is smaller, the overall arrangement is compact, and the adaptability is better.

3. There is no power interruption during the shifting process, and the reliability is higher.

DRAWINGS

Figure 1 is a schematic view of the neutral structure.

Figure 2 is a schematic diagram of the power transmission of the first block.

Figure 3 is a schematic diagram of the power transmission of the second gear.

Figure 4 is a schematic view showing the structure of the shifting mechanism.

Figure 5 is a schematic view of the structure of the second intermediate shaft.

List of reference signs:

1, motor, 2, input shaft, 3, first gear intermediate shaft, 4, electromagnet, 5, shift pin, 6, upper transfer baffle, 7, lower transfer baffle, 8, first gear intermediate shaft gear 9, differential input gear, 10, differential, 11, output shaft drive gear, 12, output shaft first gear, 13, output shaft second gear, 14, output shaft, 15, second gear countershaft gear 16, the shell.

Detailed ways

The present invention will be further clarified by the following description in conjunction with the accompanying drawings and specific embodiments. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, the words "inside" and "outside" "Respectively refers to the direction toward or away from the geometric center of a particular component.

As shown in FIG. 1 , a two-speed transmission for a pure electric vehicle includes a motor 1, an input shaft 2, a second intermediate shaft 3, an output shaft 14, a differential 10, and a first gear. The intermediate shaft gear 8, the differential input gear 9, the output shaft drive gear 11, the output shaft first gear 12, the output shaft second gear 13, and the second intermediate shaft gear 15.

The output shaft of the motor 1 is coaxially fixed to the input shaft 2.

The first gear intermediate shaft gear 8 and the output shaft first gear 12 are often meshed into a single gear cylindrical gear pair;

The second gear intermediate shaft gear 15 and the output shaft second gear 13 are constantly meshed to form a second gear cylindrical gear pair;

The output shaft second gear 13 and the output shaft first gear 12 are coaxially fixed with the output shaft 14;

The output shaft drive gear 11 is coaxially fixed to the output shaft 14;

The output driven gear is coaxially fixed to the differential 10;

The output driving gear and the output driven gear 9 constitute a normally meshing cylindrical gear pair;

The input shaft 2 is coaxial with the second intermediate shaft 3;

The input shaft 2 and the second intermediate shaft 3 are parallel to the output shaft 14;

The electromagnet 4 is mounted on the input shaft cylinder surface, and the two shift pins 5 are connected by a spring;

The motor 1 is coaxial with the input shaft 2.

The working and shifting methods of this embodiment are as follows:

1. As shown in Fig. 1, the neutral gear and the electromagnet are de-energized. The shift pin 5 is located between the upper transfer baffle 6 and the lower transfer baffle 7 and is in a pop-up state; at this time, the second-speed intermediate shaft assembly is divided. The movable baffle 7 is lifted because the clutch driven disc of the second intermediate shaft is not in contact with the clutch active disc at the rear end of the housing 16; the clutch driven disc of the first intermediate shaft 3 is also not engaged with the clutch active disc inside the housing 16. Contact; no power transmission at this time;

2. As shown in Fig. 2, the first gear, the electromagnet 4 is energized, and the head of the shift pin 5 is sucked into the cylindrical hole of the intermediate shaft of the second gear. At this time, the first intermediate shaft 3 moves downward until the clutch of the first intermediate shaft 3 is driven. The disk is in contact with and compressed by the clutch active disk inside the housing 16; the power transmission route at this time is: the driving motor 1, the housing 16, the first intermediate shaft 3, the first gear intermediate shaft gear 8, and the output shaft first gear 12 , output shaft 14, output shaft drive gear 11, differential 10;

3. As shown in Fig. 3, the second gear, the first cylinder 3 moves up to the second gear intermediate shaft and the cylindrical hole is located between the upper transfer baffle 6 and the lower transfer baffle 7. At this time, the electromagnet is de-energized and will be shifted. The pin 5 is ejected, and thereafter the first intermediate shaft 3 is moved downward again until the upper transfer baffle 6 contacts and presses the shift pin 5, and the clutch disc of the second intermediate shaft is received by the axial force from the shift pin. The clutch active disk at the rear end of the housing 16 is in contact with and pressed, and the power transmission route at this time is: the driving motor 1, the housing 16, the second-speed intermediate shaft, the second-speed intermediate shaft gear 15, the output shaft second gear 13, and the output. The shaft 14, the output shaft drive gear 11, and the differential 10.

The two-speed transmission of the utility model adopts a form in which the input shaft and the intermediate shaft are coaxial, and skillfully solves the disadvantage that the height of the transmission assembly is high, the axial space size is smaller, and the overall arrangement is compact and adapted. Better sex.

The utility model is provided with an electromagnet on the second-speed transmission route, and the working state of the electromagnet is controlled by the power supply voltage, and the utility model adopts soft magnetic degaussing to make the electromagnet de-energized, and the utility model is made of soft magnetic degaussing. The electromagnet technology is used to connect the spring with the electromagnet 4 to control the shift pin. This has the advantage that the control is more sensitive than the mechanical, and the size of the magnet can be controlled by the strength of the current. When the electromagnet 4 is powered off, the shift pin 5 is in the pop-up state, the electromagnetic 4 iron is energized, and the shift pin 5 is sucked.

The first gear intermediate gear 8 and the output shaft first gear 12 are arranged in a special position in the neutral gear, and are not fully meshed, but are necessarily staggered. The purpose of the arrangement is that the first gear is in the first gear. 3 moves downward, at which time the first countershaft gear 8 and the output shaft first gear 12 are in full engagement.

The utility model improves the second-speed intermediate shaft and breaks the concept that the shaft is cylindrical in the past, and the designed double cylindrical shape has the advantage that the shaft has more functions, in addition to installing the shift gear, the electromagnetic installation is also considered. Iron 4, the role of the spring clutch driven disc, saves space and reduces the cost advantage.

The housing 16 of the present invention is in the form of a hollow, and the design has the advantage that the function of installing the first clutch active disk and the second gear clutch active disk can be considered.

In order to make the second gear work, the first gear will not cause interference. The utility model is designed with the upper baffle 6 and the lower baffle 7 on the first intermediate shaft 3, and the second intermediate gear is used for the second gear. The circular hole column moved to the second intermediate shaft is located between the upper transfer baffle 6 and the lower transfer baffle 7, and the shift pin 5 is ejected, and then the first intermediate shaft 3 is moved down again to the upper transfer baffle 6 to be pressed. Tight, second gear work, and the advantage of this design is that the two gears cooperate with each other to promote the work of the other gear.

The technical means disclosed in the solution of the present invention is not limited to the technical means disclosed in the above embodiments, and includes a technical solution composed of any combination of the above technical features.

Claims

A two-speed intermediate shaft transmission structure, comprising: a first intermediate shaft assembly, a second intermediate shaft assembly, an input shaft, a housing, an output shaft assembly, and a differential; The utility model comprises: a first intermediate shaft and a first intermediate shaft gear coaxially mounted and fixedly connected to the first intermediate shaft, an upper transfer baffle and a lower transfer baffle; and the second intermediate shaft assembly includes a second gear intermediate a shaft and a second-speed countershaft gear, an electromagnet and a shift pin fixedly coupled to the second-speed intermediate shaft; the input shaft is coupled to the front end of the housing; the housing, the first intermediate shaft assembly and the second intermediate shaft Coaxially mounted, and the clutch driven disc of the first intermediate shaft assembly is located in the housing, and the clutch driven disc of the second intermediate shaft assembly is located at the rear end of the outer casing; the output shaft assembly includes: coaxial Installing and fixing an output shaft first gear, an output shaft second gear and an output shaft drive gear connected to the output shaft; the first gear of the output shaft is constantly meshed with the first intermediate gear; the second gear of the output shaft and the second gear The countershaft gear is always meshed; the output shaft is actively toothed Output gear constantly meshed with the differential.
A two-speed countershaft transmission structure according to claim 1, wherein the input shaft is coaxially mounted and fixedly coupled to an output shaft of the drive motor, and the input shaft is coaxially mounted and fixedly coupled to the housing. .
A two-speed countershaft transmission structure according to claim 1, wherein: the upper transfer baffle, the lower transfer baffle and the first countershaft gear are axially distributed on the first intermediate shaft. Wherein, the upper transfer baffle and the lower transfer baffle are coaxially connected with the first intermediate shaft through the deep groove ball bearing, and the first intermediate shaft gear is coaxially fixedly connected with the first intermediate shaft.
A two-speed countershaft transmission structure according to claim 1, wherein said shift pin has a movable distance in the upper transfer baffle and the lower transfer baffle that is smaller than a clutch of the first intermediate shaft assembly. The maximum distance from the driven plate to the clutch active disk inside the housing.
A two-speed countershaft transmission structure according to claim 1, wherein said shift pin is a cylinder having a hemispherical head, and the tail is connected to the electromagnet by a spring, and the cylinder and the second gear are on the intermediate shaft. The circular through hole is a clearance fit.
A two-speed countershaft transmission structure according to claim 1, wherein said housing is a hollow structure.
A two-speed countershaft transmission structure according to claim 1, wherein said second intermediate shaft has a double cylindrical shape.
A shifting method for a two-speed countershaft transmission structure according to claim 1, wherein:

(1), neutral, the electromagnet is de-energized, the shift pin is located between the upper transfer baffle and the lower transfer baffle, and is in the pop-up state; at this time, the second-speed intermediate shaft assembly is lifted by the lower transfer baffle Because the clutch disc of the second intermediate shaft does not contact the clutch active disc at the rear end of the housing; the clutch driven disc of the first intermediate shaft is not in contact with the clutch active disc inside the housing; no power transmission is performed at this time;

(2), first gear, the electromagnet energizes the shift pin head into the cylindrical hole of the second gear intermediate shaft, at this time, the middle axial direction of the first gear moves downward until the clutch driven plate of the first intermediate shaft and the inside of the casing The clutch active disk contacts and compacts; the power transmission route at this time is: drive motor, housing, first gear intermediate shaft, first gear intermediate shaft gear, output shaft first gear, output shaft, output shaft drive gear, differential ;

(3), the second gear, the first cylindrical hole moving in the middle axial direction to the second intermediate shaft is located between the upper transfer baffle and the lower transfer baffle. At this time, the electromagnet is de-energized and the shift pin is ejected. The first intermediate shaft moves downward again until the upper transfer baffle contacts and presses the shift pin. Due to the axial force from the shift pin, the clutch follower plate of the second intermediate shaft and the clutch active disk at the rear end of the housing Contact and compression, the power transmission route at this time is: drive motor, housing, second gear intermediate shaft, second gear intermediate shaft gear, output shaft second gear, output shaft, output shaft drive gear, differential.