CN202392086U

CN202392086U - Main speed reducer shell for light vehicle bridge

Info

Publication number: CN202392086U
Application number: CN2011205678677U
Authority: CN
Inventors: 朱锐; 陈辉; 刘志英; 冯喜成; 曹定础; 陈永华; 陈卫星; 谢鸿; 唐建颖
Original assignee: Dongfeng Dana Axle Co Ltd
Current assignee: Dongfeng Dana Axle Co Ltd
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2012-08-22
Anticipated expiration: 2021-12-30

Abstract

The utility model discloses a main speed reducer shell for a light vehicle bridge. A step for installing a bearing is directly cast on a speed reducer shell; the bearing is directly assembled on the speed reducer shell; an active conical gear is directly assembled in a bearing hole; an installation surface of the speed reducer shell is provided with a through hole and is directly connected with a bridge shell; and reinforcing ribs are arranged corresponding to a front bearing and a rear bearing of the active conical gear and a differential bearing. According to the utility model, the meshing accuracy of the active conical gear can be improved effectively; a guide bearing is not adopted for supporting the active conical gear, space is saved, a space basis is provided for the wide gear surface design of the gear, and the design concept of high-power density of the speed reducer is realized finally; through resonable arrangement and optimization calculation of support ribs, the minimum basic wall thickness of the speed reducer shell can be 4mm; meanwhile, the service life of the gear is not influenced, and light weight design is realized; and proved by the rack and road experiments, bearing death from burn and early failure do not happen, and the matching requirements of a finished vehicle are met.

Description

Light-duty vehicle bridge is used bevel housing

Technical field

The utility model relates to field of automobile, is that a kind of light-duty vehicle bridge is used integrated type specifically

The main reducing gear cast housing.

Background technique

Bevel housing is one of kernel component in the axle assembly, and its structure and intensity directly have influence on the performance and the working life of whole retarder.As shown in Figure 1, be the existing position of reducer shell in speed reducer assembly, and the component that are connected with reducer shell: sequence number 1 is a reducer shell; Sequence number 2 is drive bevel gear; Sequence number 3 is by dynamic bevel gear, and sequence number 4, sequence number 5 are to support the fore bearing and the rear bearing of drive bevel gear, and sequence number 6 is to support the guide bearing of drive bevel gear; Sequence number 7 is to support the bearing support of drive bevel gear front and back bearings; Bearing support 7 is connected on the reducer shell 1 through bolt 9, and sequence number 8 is differential mechanisms, and main support is by dynamic bevel gear 3; Fig. 2 is the 3-D view of existing retarder, and sequence number 1 is a reducer shell, and sequence number 7 is to support the bearing support of drive bevel gear front and back bearings, and sequence number 8 is differential mechanisms; Fig. 3 is the structure diagram of existing reducer shell, and sequence number 1 is a reducer shell, and sequence number 7 is to support the bearing support of drive bevel gear front and back bearings.Common heavy retarder drive bevel gear 2 adopts bearing support 7 to be installed on the reducer shell 1; Drive bevel gear 2 is supported by three bearings in groups; Be respectively a pair of fore bearing 4 and rear bearing 5 and guide bearing 6; This structure is owing to needing to arrange the bolt of coupling shaft bearing 7 and the mounting point of guide bearing 6, and is bigger to the spatial requirement of retarder, is suitable for the bigger structure of heavy vehicle bridge self Dimensions.And for light-duty vehicle bridge, the overall dimensions specification is less than normal, arranges that in limited space nut connects and guide bearing, and the space is narrow.

The model utility content

Adopt nut and the general deficiency bigger than normal of guide bearing connection space for overcoming existing light-duty vehicle bridge; The model utility purpose of the utility model is to provide a kind of light-duty vehicle bridge to use bevel housing; Adopt to reduce bearing support and with the support of the connected nut that subtracts shell and guide bearing to drive bevel gear; To satisfy of the requirement of Light-duty Vehicle power from motor transmitting torque to ground, improve the integrated support ability and the gear installation precision of housing, strengthen support strength and rigidity to bearing; Guarantee the requirement of Gear Meshing Stiffness, for high power density design provides the more useful space.

For realizing above-mentioned purpose; The utility model technological scheme be: directly the front step and the backward step of fore bearing and rear bearing are installed in casting on reducer shell; Have the fore bearing hole and the rear bearing hole that are used to assemble fore bearing and rear bearing in the reducer shell; Fore bearing and rear bearing directly are assemblied on the reducer shell, and drive bevel gear directly is assemblied in the hole of fore bearing and rear bearing; The plane of the attachment face of reducer shell for the through hole of guide bearing need be installed; In the respective support position of fore bearing and the rear bearing of assembling drive bevel gear and differential bearing one, differential bearing two, be designed with stiffening rib one, stiffening rib two, the stiffening rib three of realization to the support of fore bearing and rear bearing and differential bearing one, differential bearing two.

The utility model is owing to reduced being connected of bearing support and reducer shell; Drive bevel gear does not need guide bearing to support; Reducer shell is not cast the position, hole of support guide bearing; While is the hole of processing and assembling guide bearing no longer, has improved the installation precision of drive bevel gear, has saved bolted space.

The utility model is in the relevant position of assembling forward and backward bearing of drive bevel gear and differential bearing one, differential bearing two; Stiffening rib one, stiffening rib two, stiffening rib three have been increased; Pass through computer simulation technique; The simulation stressing conditions of reducer shell under retarder in working state is basis for estimation with the intensity of housing with to the support stiffness of gear, supporting rib position reasonable in design; Reaching under the prerequisite that guarantees casing rigidity and gear support stiffness, the basic wall thickness of reducer shell is controlled at about 4mm.Effectively realized light-weight design, reduced complete vehicle quality, oil consumption reduces.

The utility model compared with prior art has the following advantages:

1, owing to adopts the spring bearing of drive bevel gear to be directly installed on the reducer shell; The installation precision of drive bevel gear is directly guaranteed by the machining accuracy of reducer shell; Do not exist the installation precision of bearing support to influence the installation precision of drive bevel gear, thereby effective assurance is provided for the accuracy of mesh of drive bevel gear.

2, owing to do not adopt guide bearing to support drive bevel gear, saved the space,, finally realized the design concept of the high power density of retarder for the wide flank of tooth design of gear provides space basis.

3, through the reasonable Arrangement and the computation optimization of supporting rib, the basic wall thickness minimum of reducer shell can reach 4mm, does not influence the life-span of gear simultaneously, has realized light-weight design.

4, through stand and roadway experiment checking, bearing do not occur and burn to death and gear early failue, satisfy the coupling needs of car load.

Description of drawings

Below in conjunction with accompanying drawing the utility model is described further.

Fig. 1 is the existing location diagram of reducer shell in speed reducer assembly;

Fig. 2 is the 3-D view of Fig. 1;

Fig. 3 is the structure diagram of the reducer shell of Fig. 1;

Fig. 4 is the location diagram of the utility model reducer shell in speed reducer assembly;

Fig. 5 is the 3-D view of Fig. 4;

Fig. 6 is the structure diagram of reducer shell 1;

Fig. 7 is the 3-D view of the direction of Fig. 6;

Fig. 8 is the 3-D view of another direction of Fig. 6.

Embodiment

Like Fig. 4, Fig. 5, Fig. 6, Fig. 7, shown in Figure 8; The utility model is on reducer shell 1; According to the requirement of gear engagement requirement and Bearing Installation precision, directly casting is used for installing respectively the front step 11 and backward step 10 of fore bearing 4 and rear bearing 5, and directly casts out the fore bearing hole 12 and rear bearing hole 9 that is used to assemble fore bearing 4 and rear bearing 5; Fore bearing 4 directly is assemblied on the reducer shell 1 with rear bearing 5, and drive bevel gear 2 directly is assemblied in the hole of fore bearing 4 and rear bearing 5; The attachment face of reducer shell 1 is the plane 16 that the through hole of guide bearing need be installed, and fixes through the screw thread on this face and the axle housing; Relevant position at the fore bearing 4 of assembling drive bevel gear 2 and rear bearing 5 and differential bearing 1, differential bearing 2 18 has stiffening rib 1, stiffening rib 2 14, stiffening rib 3 15.

The drive bevel gear 2 of the utility model reducer shell 1 does not adopt bearing block structure and guiding supporting structure.This model utility is set up the topological optimization 3D mockup of reducer shell through PRO/i; Carrying out topological optimization through the HYPERWORKS finite element software calculates; According to result of calculation, adopt the PRO/i secondary to set up detailed 3D model again, secondary carries out simulation calculation through PATRAN, NASTRAN; Based on the stress and the distortion of calculating reducer shell 1 under the tired stand test stress of gear; Through contrasting with the allowable stress of material and the distortion of mark post product, optimize the 3D model repeatedly, finally adopt integrated support.The structure of this reducer shell 1 had both satisfied the needs of light bridge transmission of power, can reduce the bearing support nut simultaneously and connect and guide bearing, and corresponding structural strength and the rigidity that improves corresponding position of bearings improves the integrated support ability of housing and the installation precision of gear.

The utility model is abandoned the structure that heavy reducer shell drive bevel gear commonly used is supported by bearing support, and the cancellation bearing support adopts the bearing of drive bevel gear 2 to be directly installed on the reducer shell 1; The bearings of bevel gear adopts a pair of drive bevel gear 2 and is supported by dynamic bevel gear 3, does not adopt bevel gear to add the structure of guide bearing, and correspondence improves the support stiffness of 1 pair of main cone bearing of reducer shell, and this intensity in the bearings position of housing; Design process is introduced topology and is calculated and simulation calculation, and the stressing conditions of checking reducer shell 1 under experiment condition is through continuing to optimize the size and dimension of stiffening rib 1, stiffening rib 2 14, stiffening rib 3 15; Formation is to the support of bearing and gear; Continue to optimize the thickness of reducer shell 1, basic wall thickness minimum is accomplished 4mm, still can guarantee the strength and stiffness of housing; Can not influence gear life, accomplish light-weight design.

Claims

1. a light-duty vehicle bridge is used bevel housing; It is characterized in that: go up front step (11) and the backward step (10) that fore bearing (4) and rear bearing (5) are installed in directly casting at reducer shell (1); Have the fore bearing hole (12) and rear bearing hole (9) that are used to assemble fore bearing (4) and rear bearing (5) in the reducer shell (1); Fore bearing (4) and rear bearing (5) directly are assemblied on the reducer shell (1), and drive bevel gear (2) directly is assemblied in the hole of fore bearing (4) and rear bearing (5); The plane (16) of the attachment face of reducer shell (1) for the through hole of guide bearing need be installed; In the respective support position of fore bearing (4) and the rear bearing (5) of assembling drive bevel gear and differential bearing one (17), differential bearing two (18), be designed with stiffening rib one (13), stiffening rib two (14), the stiffening rib three (15) of realization to the support of fore bearing (4) and rear bearing (5) and differential bearing one (17), differential bearing two (18).