CN-121989088-A - Machining device for reserved mounting holes of electric drive speed reducer shell

CN121989088ACN 121989088 ACN121989088 ACN 121989088ACN-121989088-A

Abstract

The invention relates to the technical field of drilling equipment, in particular to a machining device for a reserved mounting hole of an electric drive speed reducer shell, which comprises a drilling tool and a track assembly, wherein the track assembly is provided with a positioning mechanism for coaxially positioning a bearing hole of a shell, the positioning mechanism is connected with the drilling tool through an arm expanding mechanism, the invention adopts an inner shaft rod to move and roughly adjust through data fed back by a measuring assembly when the inner shaft rod is in a non-rotating state, then the track assembly rotates the inner shaft rod, the track assembly drives the inner shaft rod to move finely through data fed back by the measuring assembly, then the outer shaft sleeve is locked with the shell through the connecting assembly, and then the outer shaft sleeve is aligned with the bearing hole coaxially in high precision, the driving assembly drives the drilling tool to move the shell for high-quality hole-by-hole machining, the influence of shape errors such as ovality and conicity of the bearing hole on the positioning reference is effectively eliminated, and the position precision of drilling machining is remarkably improved.

Inventors

ZHANG XICHUAN
ZHANG DELONG
LI CHANGBO
LU JUNYING
ZHANG QIAN

Assignees

山东百昌汽车零部件有限公司

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. The machining device for the reserved mounting hole of the electric drive speed reducer shell comprises a drilling tool and a track assembly and is characterized in that a positioning mechanism for coaxially positioning a bearing hole of a shell is arranged on the track assembly, and the positioning mechanism is connected with the drilling tool through an arm expanding mechanism; The positioning mechanism comprises an outer shaft sleeve fixedly connected to the track assembly, an inner shaft rod is coaxially arranged in the outer shaft sleeve in a rotating mode, a measuring assembly for measuring the distance between the inner shaft rod and the inner wall of the bearing hole is arranged at the right end of the inner shaft rod, the track assembly drives the inner shaft rod to move to the coaxial position of the bearing hole according to distance measurement data fed back by the measuring assembly, and a connecting assembly for locking the inner shaft rod and a workpiece is arranged on the outer shaft sleeve; The track assembly drives the inner shaft rod to move and roughly adjust through the data fed back by the measuring assembly in a non-rotating state; The arm unfolding mechanism comprises a rotating block which is rotatably sleeved on the outer shaft sleeve, a movable arm which is fixedly connected with the drilling tool is radially and slidably connected to the outer side of the rotating block along the outer shaft sleeve, and the mechanism also comprises a driving assembly for driving the drilling tool to move for hole-by-hole machining; And (3) drilling the mounting hole on the electric drive speed reducer shell through coarse and fine coaxial positioning of the inner shaft rod and hole-by-hole movement of the drilling tool.
2. The device for machining reserved mounting holes in an electrically driven reducer casing according to claim 1, wherein the track assembly comprises a movable casing fixedly connected to the outer hub, the movable casing being capable of freely moving along the X, Y, Z axis and locking the position.
3. The machining device for reserved mounting holes of the electric drive reducer shell according to claim 2, wherein a synchronous motor is fixedly mounted on the left side of the movable shell, and an output shaft of the synchronous motor is fixedly connected with the inner shaft.
4. The machining device for reserved mounting holes of electric drive speed reducer shells according to claim 1, wherein the measuring assembly comprises a plurality of laser ranging sensors which are arranged at equal intervals along the circumferential direction of the inner shaft rod, the laser ranging sensors are fixedly connected to the right end of the inner shaft rod, and the laser ranging sensors are used for measuring distances between the laser ranging sensors and corresponding positions of the inner walls of the bearing holes in a non-contact mode.
5. The device for machining reserved mounting holes in an electrically driven reducer casing according to claim 4, wherein the inner shaft drives the laser ranging sensors in a non-rotating state during coarse adjustment, and the track assembly drives the inner shaft to move until the values of the laser ranging sensors are all within the same interval.
6. The machining device for reserved mounting holes of an electric drive speed reducer shell according to claim 4, wherein during fine adjustment, the inner shaft drives the laser ranging sensors to be in a rotating state, and the track assembly drives the inner shaft to move until the subtraction result of instantaneous values monitored by the laser ranging sensors is smaller than or equal to a set value.
7. The machining device for reserved mounting holes of an electric drive reducer shell according to claim 1, wherein the driving assembly comprises a servo motor fixedly mounted on an outer shaft sleeve through a bracket, and an output shaft of the servo motor is connected with a rotating block through a reducer.
8. The machining device for reserved mounting holes of an electrically driven reducer casing according to claim 1, wherein the connecting assembly comprises a plurality of locking plates which are arranged at equal intervals along the circumferential direction of the outer shaft sleeve, and the locking plates are radially and slidably connected to the right side of the outer shaft sleeve.
9. The device for machining reserved mounting holes of an electrically driven reducer casing according to claim 8, wherein the connecting assembly further comprises driving blocks axially sliding on the outer sides of the outer sleeves and in one-to-one correspondence with the locking plates, the outer sides of the driving blocks are inclined planes, and the inclined planes are in sliding connection with the corresponding locking plates.
10. The machining device for reserved mounting holes of an electrically driven reducer casing according to claim 9, wherein the connecting assembly further comprises a plurality of hydraulic cylinders fixedly mounted on the outer side of the outer shaft sleeve, and telescopic sections of the hydraulic cylinders are fixedly connected with driving blocks at corresponding positions.

Description

Machining device for reserved mounting holes of electric drive speed reducer shell Technical Field The invention relates to the technical field of drilling equipment, in particular to a machining device for reserved mounting holes of an electric drive speed reducer shell. Background The electric drive speed reducer is used as a core component of a power transmission system of a new energy automobile, a shell of the electric drive speed reducer is generally of a split type structural design and is composed of two shells, precise bearing holes are formed in the two parts and are used for installing bearings for supporting a gear transmission shaft, after the two shells are connected and combined through bolts, the coaxiality of the bearing holes of the two parts directly determines the installation accuracy of a gear shaft, and then the transmission efficiency, vibration noise and service life of the whole speed reducer are affected. The coaxiality requirement of the bearing holes is very strict, in actual production, the coaxiality of the front bearing holes and the rear bearing holes is required to be controlled within phi 0.02mm to phi 0.05mm in many high-precision reducers, certain precision application scenes even require less than or equal to 0.01mm, if the coaxiality of the bearing holes is out of tolerance, the gear shafts can incline after being installed, the contact area is reduced when the gears are meshed, the local stress is increased, the transmission efficiency is obviously reduced, and meanwhile, the service life of the bearings is obviously shortened. In order to ensure that the bearing holes on the two shell parts have higher coaxiality, the key is to ensure that the mounting holes on the joint surfaces of the left shell and the right shell have accurate position precision, and the drilling machining precision of the mounting holes directly determines the assembly position relation of the left shell and the right shell, so that the coaxiality of the bearing holes at the two ends after combination is influenced. However, when the existing drilling equipment is used for processing the reserved mounting hole on the joint surface of the shell, the manners of expanding pin positioning, taper pin positioning and the like are generally adopted, and all the methods follow the static positioning logic of 'tightening and centering', so that the axis of the mechanical structure is supposed to coincide with the hole axis as long as the mechanical structure is evenly opened and contacts the hole wall of the bearing, however, due to shape errors such as ovality, taper and the like existing in the bearing hole, the mechanical contact is not equal to the coincidence of the geometric centers. The positioning mode based on physical contact cannot effectively identify and compensate shape errors of holes, so that deviation exists between a positioning reference and a theoretical geometric center, and when the holes with the deviation are used as references for drilling subsequent mounting holes, the errors are inevitably brought in, so that the position accuracy of the mounting holes is affected, the coaxiality of the combined left and right shell bearing holes is finally reduced, and the requirement of high-accuracy assembly is difficult to meet. Therefore, how to provide a processing device capable of overcoming the above-mentioned drawbacks and realizing high-precision positioning before drilling is a technical problem to be solved in the art. Disclosure of Invention In order to solve the technical problems, the technical scheme adopted by the invention is that the machining device for the reserved mounting hole of the electric drive speed reducer shell comprises a drilling tool and a track assembly, wherein a positioning mechanism for coaxially positioning a bearing hole of a shell body with high precision is arranged on the track assembly, and the positioning mechanism is connected with the drilling tool through an arm unfolding mechanism. The positioning mechanism comprises an outer shaft sleeve fixedly connected to the track assembly, an inner shaft rod is coaxially arranged in the outer shaft sleeve in a rotating mode, a measuring assembly for measuring the distance between the inner shaft rod and the inner wall of the bearing hole is arranged at the right end of the inner shaft rod, the track assembly drives the inner shaft rod to move to the coaxial position of the bearing hole according to distance measurement data fed back by the measuring assembly, and a connecting assembly for locking the inner shaft rod and a workpiece is arranged on the outer shaft sleeve. The track assembly drives the inner shaft rod to move in rough adjustment through data fed back by the measuring assembly in a non-rotating state, and then drives the inner shaft rod to move in fine adjustment in a secondary movement state through data fed back by the measuring assembly in a rotating state. The arm unfolding mechanism compri