Four-gear transmission transmission system

Abstract

The utility model discloses a four-gear transmission transmission system which comprises a first shaft assembly and a second shaft assembly which are coaxially arranged, and the two sides of the second shaft assembly are each provided with a middle shaft assembly. The first shaft assembly comprises a first shaft, and a first shaft gear is integrally forged at the end part of the rear end of the first shaft; the second shaft assembly comprises a second shaft, a third-gear and fourth-gear sliding gear sleeve, a second shaft third-gear gear, a second shaft second-gear gear, a first-gear and second-gear sliding gear sleeve and a second shaft first-gear gear are installed on the second shaft from front to back, the middle shaft assembly comprises a middle shaft, and a middle shaft fourth-gear gear, a middle shaft third-gear gear and a middle shaft second-gear gear are sequentially and integrally forged on the middle shaft from front to back; according to the intermediate shaft assembly, the intermediate shaft and the gear on the intermediate shaft are integrally forged, formed and machined, so that the intermediate shaft assembly is simpler in structure, higher in precision, high in reliability and high in torque transmission capacity, the overall weight is reduced, the size of a gear blank is reduced, the shaft center distance is shortened, and the rigidity of a whole transmission transmission system is improved; and system performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile technology relates to a transmission drive system, concretely relates to a 4 gear transmission drive system. BACKGROUND

[0002] At present, new energy is the main development trend of engineering machinery and heavy vehicles, and the transmission as the core component of the vehicle power system plays a vital role in the normal operation of the vehicle. The working condition of new energy mining vehicles is more severe, the load is variable, and the reliability of the transmission is extremely high. Based on the above requirements, the existing market new energy vehicles mostly use the transmission with double intermediate shaft structure, the intermediate shaft gear and the intermediate shaft usually adopt interference connection, and the strength of the connection is not only subject to the performance of the material itself, but also subject to the assembly, usually adopts the hot mounting mode, to facilitate flexible adjustment of the position degree of the gear, to meet the design requirements. Under the long-time continuous operation of the transmission, the interference connection of the existing intermediate shaft and the gear will cause relative slipping, causing the load sharing performance of the double intermediate shaft to decrease, causing difficulty in gear shifting, gear drop, abnormal wear, and even gear tooth breakage and other faults, causing the failure of the transmission, thereby causing major accidents. When hot mounting, in order to avoid gear tempering, causing strength to decrease, the hot mounting temperature is usually controlled at 150 degrees Celsius, thereby further limiting the interference value. In the face of high power density transmission torque, the interference connection transmission torque mode becomes an important risk point of system reliability, especially for new energy transmission system, under high impact load, the risk increases sharply. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a 4 gear transmission drive system, which can solve the technical problems of transmission applause and even failure caused by the connection mode of the existing double intermediate shaft and the gear thereon.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme to realize it:

[0005] A 4 gear transmission drive system, comprising a shaft assembly and a two shaft assembly coaxially arranged, two intermediate shaft assemblies are arranged on both sides of the two shaft assembly;

[0006] The one-axis assembly comprises a one-axis, and a one-axis gear is integrally forged at the rear end of the one-axis; the two-axis assembly comprises a two-axis, and a two-axis three-gear, a two-axis two-gear and a two-axis one-gear are sleeved on the two-axis from front to back, the two-axis is provided with a groove and a spline for limiting the axial movement of the two-axis three-gear, the two-axis two-gear and the two-axis one-gear, a three-four-gear sliding gear sleeve is installed on the two-axis at the front side of the two-axis three-gear, a one-two-gear sliding gear sleeve is arranged on the two-axis between the two-axis two-gear and the two-axis one-gear, the three-four-gear sliding gear sleeve and the one-two-gear sliding gear sleeve are respectively matched with the outer spline on the two-axis through the inner spline and can move axially along the two-axis, and the rear end of the one-axis is connected with the front end of the two-axis.

[0007] The pair of intermediate shaft assemblies comprise an intermediate shaft, and an intermediate shaft four-gear, an intermediate shaft three-gear and an intermediate shaft two-gear are integrally forged on the intermediate shaft from front to back, and an intermediate shaft one-gear with an axial tooth structure is machined on the intermediate shaft at the rear side of the intermediate shaft two-gear.

[0008] The one-axis gear is engaged with the intermediate shaft four-gear, and the two-axis three-gear, the two-axis two-gear and the two-axis one-gear are respectively engaged with the intermediate shaft three-gear, the intermediate shaft two-gear and the intermediate shaft one-gear.

[0009] The front end of the one-axis assembly is connected with a power transmission system, the one-axis assembly transmits power to the two-axis assembly through the pair of intermediate shaft assemblies, and the two-axis assembly outputs power.

[0010] The utility model also includes the following technical features:

[0011] The front end of the two-axis is provided with a cylindrical roller bearing without an outer ring, the rear end of the one-axis gear is provided with a light hole, and the cylindrical roller bearing is installed in the light hole.

[0012] The front end of the one-axis is provided with a spline, a four-point contact ball bearing is installed between the spline and the one-axis gear, the rear end of the two-axis is provided with a spline, and a tapered roller bearing is installed between the spline and the two-axis one-gear.

[0013] The front end and the rear end of the pair of intermediate shafts are both provided with cylindrical roller bearings.

[0014] The rear end of one of the intermediate shafts is provided with a spline outside the end of the cylindrical roller bearing installed thereon.

[0015] The intermediate shaft two-gear tooth part is shaved or turned.

[0016] The utility model also comprises a one-two-gear shift fork and a three-four-gear shift fork, one ends of the one-two-gear shift fork and the three-four-gear shift fork are connected with a gear control system, the other end of the one-two-gear shift fork is connected with the one-two-gear sliding gear sleeve, and the other end of the three-four-gear shift fork is connected with the three-four-gear sliding gear sleeve.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] The utility model discloses a middle shaft and its upper gear are integrally forged into shape processing, make middle shaft assembly structure more simple, precision is higher, power transmission route is changed from the interference transmission of input shaft through middle shaft and its upper gear to the direct transmission of input shaft to middle shaft, and the transmission capacity is strong, the overall weight drops, the size of tooth blank is reduced, the shaft center distance is reduced, realizes the miniaturization of system, light weight, the reliability of middle shaft assembly is high, and the integral structure increases the rigidity of middle shaft simultaneously, and then the rigidity of the whole transmission system is increased, the gear tooth breakage, pitting, bearing damage and other conditions caused by the poor system rigidity and large deformation are reduced, and then the probability of transmission failure is reduced, and the system performance is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic diagram of the utility model.

[0020] Figure 2 It is the middle shaft assembly schematic diagram of the utility model.

[0021] Figure 3 It is the two shaft assembly structure schematic diagram of the utility model.

[0022] Figure 4 It is the structure schematic diagram of the one shaft assembly, two shaft assembly and gear control system of the utility model.

[0023] The meaning of each reference numeral in the drawing is as follows:

[0024] 1, one shaft, 2, one shaft gear, 3, two shafts, 4, two shaft three gear, 5, two shaft two gear, 6, two shaft one gear, 7, three four gear sliding tooth sleeve, 8, one two gear sliding tooth sleeve, 9, middle shaft, 10, middle shaft four gear, 11, middle shaft three gear, 12, middle shaft two gear, 13, middle shaft one gear, 14, cylindrical roller bearing, 15, four point contact ball bearing, 16, tapered roller bearing, 17, one two gear shift fork, 18, three four gear shift fork, 19, gear control system.

[0025] The specific content of the utility model is further explained and described in detail in combination with the following embodiments. DETAILED DESCRIPTION

[0026] The specific embodiments of the utility model are given below, and it should be explained that the utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical scheme of the application falls within the protection scope of the utility model.

[0027] The terms "upper", "lower", "front", "back", and the like used in the utility model only indicate the orientation or positional relationship for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and "inner" and "outer" refer to the inner and outer contours of the corresponding components, and the above terms cannot be understood as limiting the utility model. In the utility model, Figure 2 and Figure 3 The orientation is described as shown.

[0028] In addition, the ordinal numbers "first", "second", and the like are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.

[0029] In the utility model, the terms "mounting", "connection", "connection", "fixing", and the like should be understood broadly without the opposite description, for example, it can be fixedly connected, or it can be detachably connected or integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0030] Unless otherwise specified, the components in the utility model can be purchased from the market.

[0031] Embodiment:

[0032] The embodiment gives a kind of 4 gear transmission system, as shown in Figure Figures 1 to 4 It includes coaxially arranged one shaft assembly and two shaft assembly, and one intermediate shaft assembly is arranged at the two sides of two shaft assembly respectively;

[0033] One shaft assembly includes one shaft 1, and one shaft gear 2 is integrally forged at the rear end of one shaft 1;Two shaft assembly includes two shaft 3, and two shaft three gear 4, two shaft two gear 5 and two shaft one gear 6 are sleeved on two shaft 3 from front to back, recess and spline pad for limiting the axial movement of two shaft three gear 4, two shaft two gear 5 and two shaft one gear 6 are arranged on two shaft 3, three four gear sliding tooth sleeve 7 is installed on the front side of two shaft 3 of two shaft three gear 4, two shaft 3 between two shaft two gear 5 and two shaft one gear 6 is provided with a two gear sliding tooth sleeve 8, three four gear sliding tooth sleeve 7 and two gear sliding tooth sleeve 8 are matched with the outer spline on two shaft 3 through inner spline, and can move axially along two shaft 3, the rear end of one shaft 1 is connected with the front end of two shaft 3;

[0034] The pair of intermediate shaft assemblies comprises an intermediate shaft 9, and the intermediate shaft 9 is integrally forged with an intermediate shaft fourth gear 10, an intermediate shaft third gear 11 and an intermediate shaft second gear 12 from front to back, and the intermediate shaft 9 at the rear side of the intermediate shaft second gear 12 is processed with an intermediate shaft first gear 13 with shaft tooth structure;

[0035] The primary shaft gear 2 is engaged with the intermediate shaft fourth gear 10, the secondary shaft third gear 4, the secondary shaft second gear 5 and the secondary shaft first gear 6 are respectively engaged with the intermediate shaft third gear 11, the intermediate shaft second gear 12 and the intermediate shaft first gear 13.

[0036] The front end of the primary shaft assembly is connected with the power transmission system, the primary shaft assembly transmits power to the secondary shaft assembly through the pair of intermediate shaft assemblies, and the secondary shaft assembly outputs power.

[0037] In the embodiment, the transmission drive system adopts a double-intermediate-shaft structure, all gears are helical gears, the bearing capacity is high, the power density is large, and the noise is low, the primary shaft and the primary shaft gear and the intermediate shaft and the gears thereon are integrally forged and formed, the one-piece structure of the intermediate shaft has little increase in axial dimension compared with the existing assembled intermediate shaft, but the precision is high, the power transmission route is changed from the transmission of torque between the input shaft and the gears on the intermediate shaft through interference to the direct transmission of torque from the input shaft to the intermediate shaft, the transmission of torque is strong, the overall weight is reduced, the size of the gear blank is reduced, the shaft center distance is reduced, the system is miniaturized and lightened, and the reliability of the intermediate shaft assembly is high.

[0038] In operation of the embodiment, external power is input to the primary shaft gear 2, the primary shaft gear 2 is engaged with the intermediate shaft fourth gear 10, and power is transmitted to the intermediate shaft 9, when the control system controls the shift fork to engage in the corresponding gear position, the gears on the intermediate shaft are engaged with the corresponding gear position gears on the secondary shaft, the gear position gears on the secondary shaft transmit power to the secondary shaft through the corresponding sliding tooth sleeves, the secondary shaft is connected with the output shaft through the spline at the right end, and then the secondary shaft transmits power to the output shaft.

[0039] As a preferred scheme of the embodiment, the front end of the secondary shaft 3 is provided with a cylindrical roller bearing 14 without an outer ring, the rear end of the primary shaft gear 2 is processed with a light hole, the cylindrical roller bearing 14 is installed in the light hole, when the transmission is in a low gear position, power is transmitted between the primary shaft 1 and the secondary shaft 3 through the intermediate shaft 9, when the transmission is in a fourth gear position, the front end of the third-fourth gear sliding tooth sleeve 7 is engaged with the primary shaft gear 2, the primary shaft 1 and the secondary shaft 3 are integrated, and power is directly transmitted from the primary shaft 1 to the secondary shaft 3.

[0040] As a preferred scheme of the embodiment, the front end of the first shaft 1 is processed with a spline, a four-point contact ball bearing 15 is installed between the spline and the first shaft gear 2, the front end of the first shaft is installed on the gearbox housing through the four-point contact ball bearing 15, the external power system is connected with the spline on the first shaft 1, and the external power is input into the first shaft 1; the rear end of the second shaft 3 is processed with a spline, a tapered roller bearing 16 is installed between the spline and the second shaft first gear 6, the second shaft 3 is installed on the gearbox housing through the tapered roller bearing 16, and the power transmitted to the second shaft 3 is output through the spline on the second shaft 3.

[0041] As a preferred scheme of the embodiment, the front end and the rear end of the pair of intermediate shafts 9 are both installed with cylindrical roller bearings 14, and the pair of intermediate shafts 9 are installed on the gearbox housing through the cylindrical roller bearings 14.

[0042] Further, the rear end of one of the intermediate shafts 9 is processed with a spline beyond the end of the cylindrical roller bearing 14 installed thereon, and the spline at the rear end of the intermediate shaft 9 can be connected with a power take-off or the like transmission mechanism.

[0043] As a preferred scheme of the embodiment, the intermediate shaft second gear 12 is shaved or turned in the embodiment, which can reduce the distance between the intermediate shaft second gear 12 and the intermediate shaft third gear 11, and further reduce the axial size of the entire transmission system.

[0044] As a preferred scheme of the embodiment, the embodiment further includes a first-second gear shift fork 17 and a third-fourth gear shift fork 18, one end of the first-second gear shift fork 17 and the third-fourth gear shift fork 18 are both connected with a gear control system 19 arranged on the top of the gearbox housing, the other end of the first-second gear shift fork 17 is connected with the first-second gear sliding gear sleeve 8, and the other end of the third-fourth gear shift fork 18 is connected with the third-fourth gear sliding gear sleeve 7; when the external power is input into the first shaft gear 2, the first shaft gear 2 is engaged with the intermediate shaft fourth gear 10, the gear control system 19 controls the shift fork to be engaged into the corresponding gear position, the gears on the intermediate shaft 9 are engaged with the corresponding gear on the second shaft 3, the remaining gear positions on the second shaft 3 are in idle state, the gear on the second shaft 3 transmits power to the second shaft 3 through the corresponding sliding gear sleeve, and the power is output through the spline on the second shaft 3.

[0045] In actual operation of the embodiment:

[0046] When the gear control system 19 controls the three-fourth gear shift fork 18 to engage the three-fourth gear sliding sleeve 7 with the primary shaft gear 2, power is transmitted from the primary shaft gear 2 to the secondary shaft 3 through the three-fourth gear sliding sleeve 7, realizing a transmission ratio of 1 in the fourth gear. When the gear control system 19 controls the three-fourth gear shift fork 18 to engage the three-fourth gear sliding sleeve 7 with the secondary shaft third gear 4, the connection between the primary shaft 1 and the secondary shaft 3 is idle, power is transmitted from the primary shaft gear 2 to the intermediate shaft 9 through the intermediate shaft fourth gear 10, and then transmitted from the meshing intermediate shaft third gear 11 and the secondary shaft third gear 4 to the secondary shaft 3. At this time, the secondary shaft second gear 5 and the secondary shaft first gear 6 on the secondary shaft are in an idle state, and the transmission system realizes three-gear transmission. When the gear control system 19 controls the first-second gear shift fork 17 to engage the first-second gear sliding sleeve 8 with the secondary shaft second gear 5, power is transmitted from the primary shaft gear 2 to the intermediate shaft 9 through the intermediate shaft fourth gear 10, and then transmitted from the meshing intermediate shaft second gear 12 and the secondary shaft second gear 5 to the secondary shaft 3. At this time, the connection between the primary shaft 1 and the secondary shaft 3 is also idle, the three-fourth gear shift fork 18 is not connected to the gears on both sides, the secondary shaft third gear 4 and the secondary shaft first gear 6 are also in an idle state, and the transmission system realizes two-gear transmission. When the gear control system 19 controls the first-second gear shift fork 17 to engage the first-second gear sliding sleeve 8 with the secondary shaft first gear 6, power is transmitted from the primary shaft gear 2 to the intermediate shaft 9 through the intermediate shaft fourth gear 10, and then transmitted from the meshing intermediate shaft first gear 13 and the secondary shaft first gear 6 to the secondary shaft 3. At this time, the connection between the primary shaft 1 and the secondary shaft 3 is also idle, the three-fourth gear shift fork 18 is not connected to the gears on both sides, the secondary shaft third gear 4 and the secondary shaft second gear 5 are in an idle state, and the transmission system realizes one-gear transmission.

Claims

1. A 4-speed transmission drive system characterized by, It includes coaxial one-axis assembly and two-axis assembly, and one intermediate shaft assembly is arranged on both sides of the two-axis assembly respectively. The one-axis assembly includes a shaft (1), and a shaft gear (2) is integrally forged at the rear end of the shaft (1); the two-axis assembly includes a two-axis (3), and a two-axis three-gear (4), a two-axis two-gear (5) and a two-axis one-gear (6) are sleeved on the two-axis (3) from front to back, the two-axis (3) is provided with a groove and a spline pad for limiting the axial movement of the two-axis three-gear (4), the two-axis two-gear (5) and the two-axis one-gear (6), a three-four gear sliding tooth sleeve (7) is installed on the two-axis (3) on the front side of the two-axis three-gear (4), a one-two gear sliding tooth sleeve (8) is arranged on the two-axis (3) between the two-axis two-gear (5) and the two-axis one-gear (6), the three-four gear sliding tooth sleeve (7) and the one-two gear sliding tooth sleeve (8) are matched with the outer spline on the two-axis (3) through the inner spline, and can move axially along the two-axis (3), and the rear end of the shaft (1) is connected with the front end of the two-axis (3). A pair of intermediate shaft assemblies include an intermediate shaft (9), and an intermediate shaft four-gear (10), an intermediate shaft three-gear (11) and an intermediate shaft two-gear (12) are integrally forged on the intermediate shaft (9) from front to back, and an intermediate shaft one-gear (13) with shaft tooth structure is machined on the rear side of the intermediate shaft two-gear (12). The one-axis gear (2) is engaged with the intermediate shaft four-gear (10), and the two-axis three-gear (4), the two-axis two-gear (5) and the two-axis one-gear (6) are engaged with the intermediate shaft three-gear (11), the intermediate shaft two-gear (12) and the intermediate shaft one-gear (13) respectively. The front end of the one-axis assembly is connected with the power transmission system, the one-axis assembly transmits power to the two-axis assembly through a pair of intermediate shaft assemblies, and the two-axis assembly outputs power.

2. The 4-range transmission drive system of claim 1, wherein, The front end of the two-axis (3) is provided with a cylindrical roller bearing (14) without an outer ring, and the rear end of the one-axis gear (2) is machined with a light hole, and the cylindrical roller bearing (14) is installed in the light hole.

3. The 4-range transmission drive system of claim 1, wherein, The front end of the shaft (1) is machined with a spline, and a four-point contact ball bearing (15) is installed between the spline and the one-axis gear (2); the rear end of the two-axis (3) is machined with a spline, and a tapered roller bearing (16) is installed between the spline and the two-axis one-gear (6).

4. The 4-range transmission drive system of claim 1, wherein, The front end and the rear end of the intermediate shaft (9) are both provided with a cylindrical roller bearing (14).

5. The 4-range transmission drive system of claim 4, wherein, The rear end of one of the intermediate shafts (9) is machined with a spline outside the end of the cylindrical roller bearing (14) installed thereon.

6. The 4-range transmission drive system of claim 1, wherein, The tooth part of the intermediate shaft two-gear (12) is shaved or turned.

7. The 4-range transmission drive system of claim 1, wherein, It also includes a one-two shift fork (17) and a three-four shift fork (18), one end of the one-two shift fork (17) and the three-four shift fork (18) is connected with the gear position control system (19), the other end of the one-two shift fork (17) is connected with the one-two gear sliding tooth sleeve (8), and the other end of the three-four shift fork (18) is connected with the three-four gear sliding tooth sleeve (7).

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