Differential assembly, vehicle power assembly and vehicle

Abstract

The utility model provides a differential assembly, a vehicle power assembly and a vehicle, the differential assembly comprises a shaft body, a differential control device and a first power transmission assembly, the shaft body comprises a first half shaft and a second half shaft, the differential control device comprises a driving device, a first torque transmission piece and a second torque transmission piece, the driving device can enable the first torque transmission piece to do reciprocating action, so that the first torque transmission piece can be combined with or disconnected from the second torque transmission piece, the first half shaft and the second half shaft are in transmission connection or disconnection, the first power transmission assembly comprises a fixed shaft and a rotating part hollowly sleeving the fixed shaft, and the rotating part is in transmission connection with the first half shaft and the second half shaft. According to the differential assembly, due to the fact that the fixed shaft and the rotating part are arranged, the differential rotation function of the two half shafts can be achieved, the first torque transmission piece can be combined with or disconnected from the second torque transmission piece through reciprocating motion, and therefore the first half shaft and the second half shaft are in transmission connection or disconnected.

Description

Technical Field

[0001] The utility model relates to the technical field of differential mechanisms, and in particular to a differential assembly. At the same time, the utility model also relates to a vehicle powertrain using the differential assembly, and a vehicle equipped with the vehicle powertrain. Background Art

[0002] In current vehicles, the vehicle powertrain generally includes two half-axles and a differential. The differential can realize differential rotation of the two half-axles, so that the two wheels can rotate differentially, thereby improving the driving safety of the vehicle.

[0003] Some products will also add a synchronization device on the basis of the differential to realize the function of combining or disconnecting the two half-shafts, that is, the two half-shafts can rotate differentially or synchronously. In addition, in some vehicles, the traditional differential is cancelled and two planetary gear systems are used to realize the differential rotation function of the two half-shafts.

[0004] Based on the existing product structure, if the synchronization device is cancelled, the vehicle powertrain cannot achieve the function of connecting or disconnecting the two half-shafts, and if the traditional differential is cancelled, the existing differential assembly cannot achieve the function of differential rotation of the two half-shafts. Utility Model Content

[0005] In view of this, the utility model aims to provide a differential assembly, which can realize the function of connecting and disconnecting two half-shafts, and can realize the function of differential rotation when the two half-shafts are disconnected.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A differential assembly comprises an axle body, a differential control device and a first power transmission assembly, wherein:

[0008] The shaft body comprises a first half shaft and a second half shaft;

[0009] The differential control device comprises a driving device, a first torque transmission member and a second torque transmission member; the driving device is fixedly arranged relative to the first half-shaft, the first torque transmission member is connected to the power output end of the driving device, and the second torque transmission member is arranged on the second half-shaft, the driving device can make the first torque transmission member reciprocate, and the first torque transmission member can be connected or disconnected with the second torque transmission member, so that the first half-shaft and the second half-shaft are connected or disconnected in driving manner;

[0010] The first power transmission assembly includes a fixed shaft and a rotating part loosely mounted on the fixed shaft, and the rotating part is drivingly connected to the first half shaft and the second half shaft respectively.

[0011] Furthermore, a transmission wheel is fixedly provided on the first half shaft, and the transmission wheel is in transmission connection with the rotating part;

[0012] The driving device comprises a linear driving device arranged on the transmission wheel, and the linear driving device drives the first torque transmission member to reciprocate along the axial direction of the shaft body.

[0013] Furthermore, the linear drive device includes any one of a linear motor, a hydraulic cylinder, a pneumatic cylinder and an electromagnetic drive unit.

[0014] Furthermore, a second power transmission assembly is provided on the second half shaft;

[0015] The second half shaft is drivingly connected to the rotating part through the second power transmission assembly.

[0016] Furthermore, the second power transmission assembly includes a planetary gear train, and the planetary gear train is drivingly connected to the rotating part and the second half-shaft respectively.

[0017] Furthermore, the planet carrier of the planetary gear train is fixed on the second half shaft, and the ring gear of the planetary gear train is transmission-connected to the rotating part.

[0018] Furthermore, the first power transmission components are divided into two groups, and the two groups of the first power transmission components are respectively disposed on both sides of the shaft body.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The differential assembly described in the utility model can realize the function of differential rotation when the two half-axles are disconnected due to the provision of a fixed shaft and a rotating part, and can also be combined or disconnected with the second torque transmission member through the reciprocating action of the first torque transmission member to connect or disconnect the first half-axle and the second half-axle. The overall structure is simple and the cost is low, and it can be widely used in passenger car models.

[0021] In addition, by arranging a transmission wheel on the first semi-axle, it is convenient to connect with the rotating part, and the driving device is arranged as a linear driving device, which is easy to move and convenient for overall arrangement. The linear driving device includes any one of a linear motor, a hydraulic cylinder, a cylinder and an electromagnetic driving part, and existing standard parts can be used, which is conducive to reducing production costs.

[0022] In addition, the second power transmission assembly is arranged on the second half shaft to facilitate the overall layout. The second power transmission assembly is set as a planetary gear system, which is convenient for transmission connection with the rotating part, can realize the deceleration function, and makes the overall structure more compact.

[0023] At the same time, the first power transmission components are provided in two groups, and the two groups of first power transmission components are placed on both sides of the shaft body, which is beneficial to improving the stability of the differential rotation of the first half shaft and the second half shaft.

[0024] Another object of the present invention is to provide a vehicle powertrain, which includes the differential assembly as described above.

[0025] Furthermore, it also includes a power source, and the power source includes a drive motor drivingly connected to the first half-shaft or the second half-shaft.

[0026] At the same time, another object of the present invention is to provide a vehicle, on which the vehicle powertrain as described above is provided.

[0027] The vehicle and vehicle powertrain described in the present invention have the same beneficial effects as the aforementioned differential assembly relative to the prior art, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the structure of the differential assembly in the application state according to the first embodiment of the utility model;

[0030] Figure 2 for Figure 1 A structural schematic diagram of a differential assembly in which the first half shaft and the second half shaft are in a disconnected state;

[0031] Figure 3 for Figure 1 Schematic diagram of the structure in which the first half shaft and the second half shaft of the differential assembly are in a combined state.

[0032] Description of reference numerals:

[0033] 1. Axle; 2. Differential control device; 3. First power transmission assembly; 4. Second power transmission assembly; 5. Power source; 6. Wheel;

[0034] 101, first half shaft; 102, second half shaft; 1011, transmission wheel;

[0035] 201, driving device; 202, first torque transmission member; 203, second torque transmission member;

[0036] 301, fixed shaft; 302, rotating part;

[0037] 401, sun gear; 402, planetary gear; 403, planet carrier; 404, ring gear. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] Embodiment 1

[0043] The present embodiment relates to a differential assembly, which can control the connection and disconnection of the first half-shaft 101 and the second half-shaft 102 by adding a differential control device 2, thereby realizing a locking function, and when the first half-shaft 101 and the second half-shaft 102 are disconnected, the function of differential rotation of the first half-shaft 101 and the second half-shaft 102 can also be realized.

[0044] Based on the above design ideas, such as Figure 1 As shown, the differential assembly involved in this embodiment has the functions of both speed reduction and differential. In terms of overall structure, the differential assembly mainly includes an axle 1, a differential control device 2 and a first power transmission assembly 3.

[0045] Among them, the shaft body 1 includes a first half-shaft 101 and a second half-shaft 102, and the differential control device 2 is used to control the connection or disconnection between the first half-shaft 101 and the second half-shaft 102, and the first power transmission component 3 is transmission-connected between the first half-shaft 101 and the second half-shaft 102. When the differential control device 2 disconnects the first half-shaft 101 and the second half-shaft 102, power can still be transmitted between the first half-shaft 101 and the second half-shaft 102, and the function of differential rotation of the first half-shaft 101 and the second half-shaft 102 is realized. The so-called differential rotation means that when power is transmitted between the first half-shaft 101 and the second half-shaft 102, the actual speed that the driven part can reach is different from the theoretical speed, and the differential component can still work normally.

[0046] Still refer to Figure 1 As shown, the differential control device 2 comprises a driving device 201, a first torque transmission member 202 and a second torque transmission member 203. The driving device 201 is fixedly arranged relative to the first semi-shaft 101, the first torque transmission member 202 is connected to the power output end of the driving device 201, and the second torque transmission member 203 is arranged on the second semi-shaft 102. The driving device 201 can make the first torque transmission member 202 reciprocate, and the first torque transmission member 202 can be connected or disconnected with the second torque transmission member 203, so that the first semi-shaft 101 and the second semi-shaft 102 are connected or disconnected in driving.

[0047] It should be noted here that the first torque transmission component 202 in this embodiment can be, for example, a coupling sleeve, and the second torque transmission component 203 can be, for example, a locking ring, also called a synchronization ring. When the driving device 201 drives the coupling sleeve to approach the locking ring and combine with the locking ring, the first torque transmission component 202 and the second torque transmission component 203 are combined, and the two can transmit torque, and the first half shaft 101 and the second half shaft 102 are transmission connected.

[0048] When the driving device 201 drives the coupling sleeve away from the locking ring and disconnects from the locking ring, the first torque transmission member 202 and the second torque transmission member 203 are disconnected, and the two cannot transmit torque, and the first half shaft 101 and the second half shaft 102 are disconnected, and the first half shaft 101 and the second half shaft 102 cannot transmit torque through the first torque transmission member 202 and the second torque transmission member 203.

[0049] In this embodiment, the first torque transmission member 202 may also be a lock ring, and in this case, the second torque transmission member 203 may be a coupling sleeve. In addition, the first torque transmission member 202 and the second torque transmission member 203 may also be combined with other structures to achieve torque transmission, such as end face splines or plug-in structures.

[0050] As a preferred embodiment, the aforementioned first power transmission component 3 includes a fixed shaft 301 and a rotating part 302 loosely mounted on the fixed shaft 301, and the rotating part 302 is respectively connected to the first half-shaft 101 and the second half-shaft 102 in a transmission manner, so that when the first half-shaft 101 and the second half-shaft 102 are not combined through the first torque transmission component 202 and the second torque transmission component 203, torque can still be transmitted between the first half-shaft 101 and the second half-shaft 102 through the rotating part 302.

[0051] As a preferred embodiment, a first gear and a second gear are provided on the rotating part 302 , and the first gear and the second gear are arranged along the axial spacing of the fixed shaft 301 , and the first gear is used for transmission connection with the first half shaft 101 , and the second gear is used for transmission connection with the second half shaft 102 .

[0052] It should be understood that in the present embodiment, all structures that use gears to achieve transmission connection between two components have high power transmission efficiency, high stability and reliability of power transmission. In other embodiments, it is also possible to use belt drive or chain drive to achieve transmission connection between two components, or it is also feasible for the two components to achieve transmission connection with the aid of an intermediate gear or other structure that can transmit power.

[0053] As a preferred embodiment, a transmission wheel 1011 is provided on the first semi-axle 101, and the transmission wheel 1011 is transmission-connected with the rotating part 302. As in this embodiment, the transmission wheel 1011 and the rotating part 302 are transmission-connected by a gear structure. The aforementioned driving device 201 includes a linear driving device fixed on the transmission wheel 1011, and the linear driving device drives the first torque transmission member 202 to reciprocate along the axial direction of the shaft body 1. Here, by providing the transmission wheel 1011 on the first semi-axle 101, it is convenient to be transmission-connected with the rotating part 302, and the driving device 201 is provided as a linear driving device, which is simple in movement and convenient for overall arrangement.

[0054] It should be noted that, in addition to being fixed on the transmission wheel 1011, the linear drive device can also be directly fixed on the first semi-shaft 101. In addition to the linear drive device, the drive device 201 can also include a rotation drive device 201, but it is also necessary to include a power transmission structure to achieve the function of driving the first torque transmission member 202 to reciprocate. The power transmission structure here includes, for example, a screw pair, a gear pair, a spring, etc., which can achieve the function of driving the first torque transmission member 202 to reciprocate.

[0055] In addition, the first torque transmission member 202 can be directly disposed at the power output end of the driving device 201, or can be connected to the power output end of the driving device 201. Figure 1In the state shown, the first torque transmission member 202 has a connecting shaft extending to the left, and a through hole is provided on the rotation. The first torque transmission member 202 is transmitted to the through hole to the left through the connecting shaft. A structure that reduces the sliding resistance of the connecting shaft along its own axial direction can also be arranged between the through hole and the connecting shaft, and the left end of the connecting shaft is connected to the power output end of the driving device 201, thereby realizing the function of the driving device 201 driving the first torque transmission member 202 to move back and forth.

[0056] As a preferred embodiment, the linear drive device includes any one of a linear motor, a hydraulic cylinder, a pneumatic cylinder, and an electromagnetic drive unit. The structures of the linear motor, the hydraulic cylinder, the pneumatic cylinder, and the electromagnetic drive unit can refer to the existing structure, and can directly drive the first torque transmission member 202 to reciprocate, or drive the first torque transmission member 202 to reciprocate with the help of the existing power transmission structure. In this structure, the linear drive device includes any one of a linear motor, a hydraulic cylinder, a pneumatic cylinder, and an electromagnetic drive unit, and existing standard parts can be used, which is conducive to reducing production costs.

[0057] As a preferred embodiment, the second half shaft 102 is provided with a second power transmission assembly 4, and the second half shaft 102 is transmission-connected to the rotating part 302 via the second power transmission assembly 4. Here, the second power transmission assembly 4 is provided on the second half shaft 102 to facilitate the overall arrangement.

[0058] As a preferred embodiment, still refer to Figure 1 As shown, the second power transmission assembly 4 includes a planetary gear system, which is respectively connected to the rotating part 302 and the second half shaft 102. Here, the second power transmission assembly 4 is set as a planetary gear system, which is convenient for connecting to the rotating part 302, can realize the deceleration function, and makes the overall structure more compact.

[0059] It should be understood that the second power transmission assembly 4 is used to realize the function of transmitting power between the rotating part 302 and the second half shaft 102. In addition to the planetary gear system, other structures such as gear pairs are also feasible. In addition, the second power transmission assembly 4 can also realize the deceleration function, which decelerates the rotation speed provided by the power source 5 described below and transmits it to the second half shaft 102.

[0060] As a preferred embodiment, the planet carrier 403 of the planetary gear train is fixedly mounted on the second half shaft 102, and the ring gear 404 of the planetary gear train is transmission-connected to the rotating part 302. As in this embodiment, the ring gear 404 is meshed and connected with the aforementioned second gear. In other embodiments, the sun gear 401 is fixedly connected to the second half shaft 102, and the planet carrier 403 is not fixedly connected to the second half shaft 102.

[0061] As a preferred embodiment, continue to refer to Figure 1 As shown, the first power transmission assembly 3 is divided into two groups, and the two groups of first power transmission assemblies 3 are respectively placed on both sides of the shaft body 1. At the same time, the first power transmission assembly 3 is divided into two groups, and the two groups of first power transmission assemblies 3 are respectively placed on both sides of the shaft body 1, which is conducive to improving the stability of the differential rotation of the first half shaft 101 and the second half shaft 102.

[0062] It should be noted that the first power transmission assembly 3 is divided into two groups, which can better ensure the stability of the differential rotation of the first semi-shaft 101 and the second semi-shaft 102, and is light in weight and low in cost. In addition, it is also feasible to set the number of the first power transmission assembly 3 to other values, such as 1 or more than 3. When the number of the first power transmission assembly 3 is more than 3, the more than 3 first power transmission assemblies 3 are distributed at intervals around the axial direction of the shaft body 1, preferably evenly distributed at intervals, so as to improve the stability of the differential rotation of the first semi-shaft 101 and the second semi-shaft 102.

[0063] like Figure 2 What is shown is a schematic diagram of the structure in which the first half-shaft 101 and the second half-shaft 102 are in a disconnected state. At this time, the differential control device 2 is in a disconnected mode, the power source 5 provides power and is fixedly connected to the sun gear 401, and the sun gear 401 drives the planetary carrier 403 to transmit power to the second half-shaft 102 by driving the planetary gear 402 of the planetary gear system.

[0064] Next, since the rotating part 302 and the planetary gear 402 are in transmission connection with the ring gear 404, the planetary gear 402 drives the ring gear 404, and the ring gear 404 drives the rotating part 302 to rotate. Since the rotating part 302 is in transmission connection with the transmission wheel 1011, the power is transmitted to the first half shaft 101 through the transmission wheel 1011, and the first half shaft 101 and the second half shaft 102 respectively drive the wheels 6 on the corresponding sides to rotate, so that the differential assembly can replace the deceleration differential effect of the traditional differential, and the vehicle can travel normally.

[0065] like Figure 3 The figure is a schematic diagram of the structure in which the first half-shaft 101 and the second half-shaft 102 are in a coupled state. At this time, the differential control device 2 is in a coupled mode, connecting the first half-shaft 101 and the second half-shaft 102 into one, the power source 5 provides power and is fixedly connected to the sun gear 401, and the sun gear 401 drives the planetary carrier 403 by driving the planetary gear 402 of the planetary gear train, thereby transmitting power to the first half-shaft 101 and the second half-shaft 102.

[0066] At this time, the ring gear 404 and the rotating part 302 of the planetary gear system can still work in a normal transmission relationship. At this time, the differential assembly can enable the vehicle to escape from trouble under special working conditions (such as wet and muddy roads).

[0067] The differential assembly of this embodiment, since it is provided with a fixed shaft 301 and a rotating part 302, can realize the function of differential rotation of the two half-shafts, and can also be connected or disconnected with the second torque transmission member 203 through the reciprocating motion of the first torque transmission member 202, so that the first half-shaft 101 and the second half-shaft 102 are connected or disconnected in transmission. The overall structure is simple and the cost is low, and it can be widely used in passenger car models.

[0068] Embodiment 2

[0069] The present embodiment relates to a vehicle powertrain, which includes the differential assembly of the first embodiment and a power source 5 , which is drivingly connected to the first half-shaft 101 or the second half-shaft 102 .

[0070] In this embodiment, the power source 5 is preferably a drive motor, which is coaxially arranged with the second semi-shaft 102, occupies less space and has a compact structure. When specifically connected, the power output end of the drive motor is transmission-connected with the sun gear 401 in the first embodiment, so that the power of the drive motor can be transmitted to the second semi-shaft 102 through the sun gear 401, the planetary gear 402 and the planetary carrier 403.

[0071] In this embodiment, the example in which the power provided by the power source 5 is first transmitted to the second half-shaft 102, and then transmitted to the first half-shaft 101 through a structure that can transmit power, such as the differential control device 2 and the first power transmission component is used for explanation. In this process, the second half-shaft 102 first receives the power provided by the power source 5 relative to the first half-shaft 101, and in this embodiment, the power provided by the drive motor is transmitted to the second half-shaft 102 through the second power transmission component 4. In addition, in other embodiments, the power of the drive motor can also be directly transmitted to the second half-shaft 102, or it can be transmitted to the second half-shaft 102 with the help of other power transmission structures.

[0072] It should also be understood that in the present embodiment, when the power source 5 is specifically configured, the power it provides may be transmitted to the second half-shaft 102 first and then to the first half-shaft 101. Alternatively, the power provided by the power source 5 may be transmitted to the first half-shaft 101 first and then to the second half-shaft 102 through a structure that can transmit power. Alternatively, there may be two power sources 5, and the two power sources 5 may first provide power to the first half-shaft 101 and the second half-shaft 102 respectively. When both power sources 5 output power and the first torque transmission component 202 and the second torque transmission component 203 are combined, the theoretical speed at which one of the power sources 5 causes the first half-shaft 101 to reach the same speed as the theoretical speed at which the other power source 5 causes the second half-shaft 102 to reach.

[0073] Meanwhile, the present embodiment also relates to a vehicle, which is provided with the vehicle powertrain as described above. The vehicle and the vehicle powertrain of the present embodiment have the same beneficial effects as the aforementioned differential assembly relative to the prior art, and will not be described in detail here.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential assembly, characterized in that: It comprises an axle body (1), a differential control device (2) and a first power transmission component (3); The shaft body (1) comprises a first semi-shaft (101) and a second semi-shaft (102); The differential control device (2) comprises a driving device (201), a first torque transmission member (202) and a second torque transmission member (203); the driving device (201) is fixedly arranged relative to the first half-shaft (101), the first torque transmission member (202) is connected to the power output end of the driving device (201), and the second torque transmission member (203) is arranged on the second half-shaft (102); the driving device (201) can drive the first torque transmission member (202) to reciprocate, and the first torque transmission member (202) can be connected or disconnected with the second torque transmission member (203) to make the first half-shaft (101) and the second half-shaft (102) connected or disconnected in driving manner; The first power transmission assembly (3) comprises a fixed shaft (301) and a rotating part (302) loosely sleeved on the fixed shaft (301), and the rotating part (302) is respectively drivingly connected to the first half shaft (101) and the second half shaft (102).

2. The differential assembly according to claim 1, characterized in that: A transmission wheel (1011) is fixedly provided on the first half shaft (101), and the transmission wheel (1011) is transmission-connected to the rotating part (302); The driving device (201) comprises a linear driving device arranged on the transmission wheel (1011), and the linear driving device drives the first torque transmission member (202) to reciprocate along the axial direction of the shaft body (1).

3. The differential assembly according to claim 2, characterized in that: The linear drive device includes any one of a linear motor, a hydraulic cylinder, a pneumatic cylinder and an electromagnetic drive unit.

4. The differential assembly according to claim 1, characterized in that: The second half shaft (102) is provided with a second power transmission assembly (4); The second half shaft (102) is transmission-connected to the rotating part (302) via the second power transmission assembly (4).

5. The differential assembly according to claim 4, characterized in that: The second power transmission assembly (4) comprises a planetary gear train, which is respectively in driving connection with the rotating part (302) and the second half shaft (102).

6. The differential assembly according to claim 5, characterized in that: The planet carrier (403) of the planetary gear train is fixedly arranged on the second half shaft (102), and the ring gear (404) of the planetary gear train is drivingly connected to the rotating part (302).

7. The differential assembly according to any one of claims 1 to 6, characterized in that: The first power transmission components (3) are divided into two groups, and the two groups of the first power transmission components (3) are respectively arranged on both sides of the shaft body (1).

8. A vehicle powertrain, characterized in that: The vehicle powertrain comprises the differential assembly according to any one of claims 1-7.

9. The vehicle powertrain according to claim 8, characterized in that: It also includes a power source (5), wherein the power source (5) includes a drive motor drivingly connected to the first half-shaft (101) or the second half-shaft (102).

10. A vehicle, characterized in that: The vehicle is provided with the vehicle powertrain according to claim 8 or 9.

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