Differential mechanism structure

Abstract

The utility model relates to a differential mechanism structure and belongs to the technical field of automobile transmission. Comprising a main reduction gear, a differential shell and a planetary gear shaft. The main reduction gear is fixed on the outer surface of the differential shell; the planetary gear shaft is connected with the differential mechanism shell through a roll pin. A planetary gear is mounted on the planetary gear shaft; the differential mechanism further comprises a half axle gear, and the half axle gear is installed on the differential mechanism shell and meshed with the planetary gear. Half shafts used for being connected with a vehicle are installed on the two opposite end faces of the differential mechanism shell respectively. A rolling bearing is arranged between the half axle gear and the differential shell; a rolling bearing is arranged between the planetary gear and the planetary gear shaft; and a rolling bearing is arranged between the half shaft and the differential shell. According to the technical scheme, sliding friction between parts in the differential mechanism structure is adjusted into rolling friction by arranging the rolling bearing, and the effect of improving transmission efficiency and transmission reliability can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a differential structure belongs to automobile transmission technical field. BACKGROUND

[0002] With the continuous development of the automobile industry, the transmission and the whole power system need to face more and more complex working conditions, and the user's demand for the transmission efficiency and reliability of the transmission is more and more urgent. The differential is an important part of the automobile transmission, and the conventional design differential can not meet the development requirements of the automobile industry for high transmission efficiency and high reliability of the transmission.

[0003] At present, the conventional design differential, such as Figure 2 As shown in the figure, the half shaft gear and the differential shell are slidably frictioned through the half shaft gear gasket, resulting in heat generated by friction, and there are problems of half shaft gear gasket ablation risk, low transmission efficiency, light hole cooperation between the planetary gear and the planetary gear shaft, sliding friction, heat generated by friction, planetary gear ablation risk, low transmission efficiency, light hole cooperation between the half shaft and the differential shell, sliding friction, heat generated by friction, half shaft ablation risk, and low transmission efficiency. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a spherical needle roller bearing and differential to solve the above technical problems.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme of:

[0006] A differential structure, comprising a main reduction gear, a differential shell and a planetary gear shaft, the main reduction gear is fixed on the outer surface of the differential shell, the planetary gear shaft is connected with the differential shell by using a roll pin, the planetary gear is installed on the planetary gear shaft, further comprising a half shaft gear, the half shaft gear is installed on the differential shell and engaged with the planetary gear, the half shafts for connecting with the vehicle are respectively installed on the opposite end faces of the differential shell, the rolling bearing is installed between the half shaft gear and the differential shell, the rolling bearing is installed between the planetary gear and the planetary gear shaft, and the rolling bearing is installed between the half shaft and the differential shell.

[0007] The further improvement of the utility model technical scheme is that the rolling bearing includes but is not limited to deep groove ball bearing, cylindrical roller bearing, thrust cylindrical roller bearing and needle roller bearing.

[0008] The further improvement of the utility model technical scheme is that the thrust cylindrical roller bearing is installed between the half shaft gear and the differential shell.

[0009] The further improvement of the utility model technical scheme is that the needle roller bearing two is installed between the half shaft and the differential shell.

[0010] The further improvement of the technical scheme of the utility model is that a needle roller bearing one is installed between the planetary gear and the planetary gear shaft.

[0011] Due to the adoption of the above technical scheme, the utility model has the following technical effects:

[0012] (1) High transmission efficiency: the sliding friction between the half shaft gear and the differential housing is adjusted to rolling friction by replacing the half shaft gear gasket with a rolling bearing, the sliding friction between the planetary gear and the planetary gear shaft is adjusted to rolling friction by adding a rolling bearing between the planetary gear and the planetary gear shaft, and the sliding friction between the half shaft and the differential housing is adjusted to rolling friction by adding a rolling bearing between the half shaft and the differential housing, so that the heat generated by friction is reduced during the operation of the differential, the corresponding loss is reduced, and the transmission efficiency of the differential is improved.

[0013] (2) High reliability: the sliding friction between the half shaft gear and the differential housing is adjusted to rolling friction by replacing the half shaft gear gasket with a rolling bearing, the sliding friction between the planetary gear and the planetary gear shaft is adjusted to rolling friction by adding a rolling bearing between the planetary gear and the planetary gear shaft, and the sliding friction between the half shaft and the differential housing is adjusted to rolling friction by adding a rolling bearing between the half shaft and the differential housing, so that the heat generated by friction is reduced during the operation of the differential, the corresponding risk of part wear and ablation is reduced, and the reliability of the differential is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the differential of the utility model;

[0015] Figure 2 is a conventional design differential;

[0016] Among them, 1, planetary gear, 2, needle roller bearing one, 3, half shaft gear, 4, thrust cylindrical roller bearing, 5, half shaft, 6, needle roller bearing two, 7, main reduction gear, 8, differential housing, 9, roll pin, 10, planetary gear shaft. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0018] In the description of the utility model, it is necessary to explain that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the position or location relationship based on the position or location relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0019] The utility model relates to a differential structure, which is mainly applied to the differential of an automobile.

[0020] The following is the description of the differential and related parts of the differential:

[0021] Differential: installed in the electric drive assembly transmission, located between the automobile half shaft and motor shaft, mainly composed of left and right half shaft gears, a plurality of planetary gears and gear carriers, capable of enabling the left and right drive wheels to rotate at different speeds.

[0022] Half shaft gear: installed on the differential housing, connected with the left and right half shafts, and plays a role in transmitting torque.

[0023] Planetary gear: installed on the planetary gear shaft, engaged with the half shaft gear, and plays a role in transmitting torque and realizing the speed difference between the left and right half shafts.

[0024] Planetary gear shaft: installed on the differential housing, used for fixing the planetary gear and transmitting torque.

[0025] Differential housing: connected with the main reduction gear, used for fixing the half shaft gear, planetary gear shaft and transmitting torque.

[0026] Pin: used for fixing the planetary gear shaft.

[0027] Main reduction gear: located between the intermediate gear and the differential, engaged with the intermediate gear, and plays a role in transmitting torque.

[0028] Half shaft: located between the automobile wheel and the differential, and plays a role in transmitting torque.

[0029] Thrust cylindrical roller bearing: composed of a retainer, inner and outer rings and cylindrical rollers, and plays a role in centering and bearing axial force.

[0030] Roller bearing: composed of a retainer and rollers, and plays a role in centering and bearing radial force.

[0031] This technical solution is based on the existing differential structure and involves arranging rolling bearings between the friction pairs of the differential. Other differential structures are known to those skilled in the art. Specifically, the improvement of this technical solution involves adjusting the sliding friction between the half-shaft gear and the differential housing to rolling friction, adjusting the sliding friction between the planetary gears and the planetary gear shafts to rolling friction, and adjusting the sliding friction between the half-shaft and the differential housing to rolling friction.

[0032] The method of changing from sliding friction to rolling friction is to use rolling bearings. Specifically, rolling bearings are installed between the half-shaft gear 3 and the differential housing 8; between the planetary gear 1 and the planetary gear shaft 10; and between the half-shaft 5 and the differential housing 8. Rolling bearings include, but are not limited to, deep groove ball bearings, cylindrical roller bearings, thrust cylindrical roller bearings, and needle roller bearings.

[0033] In specific implementation, a thrust cylindrical roller bearing 4 is installed between the half-shaft gear 3 and the differential housing 8. A needle roller bearing 6 is installed between the half-shaft 5 and the differential housing 8. A needle roller bearing 2 is installed between the planetary gear and the planetary gear shaft.

[0034] like Figure 1 As shown, the differential structure includes a main reduction gear 7, a differential housing 8, and a planetary gear shaft 10. The main reduction gear 7 is fixed to the outer surface of the differential housing 8, and meshes with the intermediate shaft gear of the transmission to transmit torque and speed to the differential housing 8.

[0035] The planetary gear shaft 10 is connected to the differential housing 8 via a coiled pin 9. The planetary gear shaft 10 transmits torque and speed. A needle roller bearing 2 is mounted on it, and the planetary gear 11 is mounted on the planetary gear shaft 10, rotating around the planetary gear shaft 10 via the needle roller bearing 2. The planetary gear 1 is also mounted on the planetary gear shaft 10 and can rotate around the planetary gear shaft 10 via the needle roller bearing 2. The planetary gear 1 meshes with the half-shaft gear 3, transmitting torque and speed differences.

[0036] The differential structure also includes a half-shaft gear 3, which is mounted on the differential housing 8 and can rotate through the thrust cylindrical roller bearing 4. The half-shaft gear 3 meshes with the planetary gear 11 to transmit torque and speed difference.

[0037] Half-shafts 5 for connecting to the vehicle are respectively installed on opposite end faces of the differential housing 8. The half-shafts 15 are installed between the differential and the wheels and can rotate via needle roller bearings 16 to transmit the vehicle's torque and speed.

[0038] Rolling bearings are installed between the half shaft gear 3 and the differential housing 8; rolling bearings are installed between the planetary gear 1 and the planetary gear shaft 10; rolling bearings are installed between the half shaft 5 and the differential housing 8.

[0039] The rolling needle bearing 12 used in the technical solution mainly comprises a retainer and rolling needles.

[0040] The working process of the differential is as follows: when the rotational speeds of the left and right wheels are different, the rotational speeds of the left and right half shafts 5 are different, at this time, the half shaft 5 rotates around the rolling needle bearing two 6 between the half shaft 5 and the differential housing 8, the half shaft 5 rotates around the thrust cylindrical roller bearing 4 between the half shaft gear 3 and the differential housing 8 with the half shaft gear 3, the half shaft gear 3 meshes with the planetary gear 1, and then the planetary gear 1 rotates around the planetary gear shaft 10 through the rolling needle bearing one 2, the rolling needle bearing one 2, the rolling needle bearing two 6 and the thrust cylindrical roller bearing 4 all belong to rolling friction mode, thereby realizing low friction heat generation, low friction loss, high transmission efficiency and high reliability.

[0041] In the technical solution, the sliding friction between the friction pairs is adjusted to rolling friction by using rolling bearings, the friction heat generation between the friction pairs is reduced, the friction loss of the differential is reduced, and the transmission efficiency of the differential assembly is improved.

[0042] In the technical solution, the sliding friction between the friction pairs is adjusted to rolling friction by using rolling bearings, the friction heat generation between the friction pairs is reduced, the ablation risk between the friction pairs is reduced, and the reliability of the differential assembly is improved.

[0043] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only to illustrate the principle of the utility model, various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A differential structure comprising a main reduction gear (7), a differential housing (8) and a planetary gear shaft (10); the main reduction gear (7) is fixed on the outer surface of the differential housing (8); the planetary gear shaft (10) is connected with the differential housing (8) by using a roll pin (9); a planetary gear (1) is installed on the planetary gear shaft (10); further comprising a half axle gear (3) which is installed on the differential housing (8) and engaged with the planetary gear (1); half axles (5) for connecting with a vehicle are installed on the opposite end faces of the differential housing (8) respectively; characterized in that: Rolling bearings are installed between the half axle gear (3) and the differential housing (8); rolling bearings are installed between the planetary gear (1) and the planetary gear shaft (10); rolling bearings are installed between the half axle (5) and the differential housing (8).

2. A differential structure according to claim 1, characterised in that: The rolling bearings include but are not limited to deep groove ball bearings, cylindrical roller bearings, thrust cylindrical roller bearings, needle bearings.

3. A differential structure according to claim 2, characterised in that: Thrust cylindrical roller bearings (4) are installed between the half axle gear (3) and the differential housing (8).

4. A differential structure according to claim 2, wherein: Needle bearings two (6) are installed between the half axle (5) and the differential housing (8).

5. A differential structure according to claim 2, wherein: Needle bearings one (2) are installed between the planetary gear and the planetary gear shaft.

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