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CN-224214658-U - Spline sleeve and rotary gear assembly matched with rock drill

CN224214658UCN 224214658 UCN224214658 UCN 224214658UCN-224214658-U

Abstract

The utility model discloses a spline sleeve and rotary gear assembly matched with a rock drill, which comprises a spline sleeve and a rotary gear, wherein the rotary gear is fixedly sleeved outside the spline sleeve, the side profile of the spline sleeve comprises a plurality of curves A, a plurality of curves B and a plurality of curves C, the curves A are outwards convex circular arcs, the curves B are outwards convex circular arcs, the curves C are inwards concave circular arcs, the curves B are positioned at corners of the side profile of the spline sleeve, the curves A and the curves B are smoothly connected through the curves C, splines are arranged in the spline sleeve, the rotary gear comprises an inner wheel surface, the inner wheel surface is identical to and is attached to the side profile of the spline sleeve, and the spline sleeve and the rotary gear matched with the rock drill provided by the utility model rotate more stably under impact load by arranging all the side profiles of the spline sleeve into the curves, and reducing angle fluctuation in rotation by multi-surface engagement.

Inventors

  • PAN HAO
  • PAN ZHENJUN
  • LI TONG
  • WANG FENGKAI

Assignees

  • 烟台军恒工程机械设备有限公司

Dates

Publication Date
20260508
Application Date
20250709

Claims (8)

  1. 1. The spline sleeve and rotary gear assembly matched with a rock drill comprises a spline sleeve (2) and a rotary gear (3), wherein the rotary gear (3) is fixedly sleeved outside the spline sleeve (2), the spline sleeve is characterized in that the side profile of the spline sleeve (2) comprises a plurality of curves A (21), a plurality of curves B (22) and a plurality of curves C (23), the curves A (21) are outwards protruding circular arcs, the curves B (22) are outwards protruding circular arcs, the curves C (23) are inwards concave circular arcs, the curves B (22) are located at corners of the side profile of the spline sleeve (2), the curves A (21) and the curves B (22) are connected smoothly through the curves C (23), splines (24) are arranged in the spline sleeve (2), the rotary gear (3) comprises inner wheel surfaces (33), and the inner wheel surfaces (33) are identical in shape and fit with the outer wheel profiles of the spline sleeve (2).
  2. 2. A splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterised in that the curvatures of the curves A (21), B (22) and C (23) are different from each other.
  3. 3. A spline sleeve and rotary gear assembly for use with a rock drill according to claim 1, wherein the number of curves A (21) and B (22) is 4 and the number of curves C (23) is 8.
  4. 4. A splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterised in that all curves A (21) are of the same diameter, all curves B (22) are of the same diameter and all curves C (23) are of the same diameter.
  5. 5. A splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterised in that the curvature of curve B (22) is 1.7-2.2 times the curvature of curve A (21).
  6. 6. A splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterised in that the curvature of the curve C (23) is 7-9 times the curvature of the curve A (21).
  7. 7. A splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, wherein the number of splines (24) is 4, 6 or 8.
  8. 8. A spline sleeve and rotary gear assembly for use with a rock drill according to claim 1, wherein the spline sleeve (2) is copper or copper alloy.

Description

Spline sleeve and rotary gear assembly matched with rock drill Technical Field The utility model relates to the technical field of rock drills, in particular to a spline sleeve and rotary gear assembly matched with the rock drill. Background Rock drills are used as devices specially adapted for rock drilling, which are developed to meet the demands of efficient and accurate drilling in these engineering constructions. The core transmission structure of the rock drill is key to realizing the drilling function of the rock drill, is mainly responsible for converting a power source into impact action and rotation action required by rock drilling, and transmits force and motion to a drill bit through a mechanical transmission part to complete rock breaking. The existing rock drill transmission structure consists of a spline sleeve and a rotary gear, wherein the outer contour of the spline sleeve is circular, and the inner contour of the rotary gear and the outer contour of the spline sleeve are circular, so that the angle fluctuation is large when the rotary gear and the spline sleeve rotate, and the rotation is unstable under impact load. Therefore, a spline sleeve and rotary gear assembly for a rock drill is provided, and the problems are solved. Disclosure of utility model Aiming at the defects of the prior art, the invention aims to provide a spline sleeve and rotary gear assembly matched with a rock drill for solving the problems in the prior art. In order to solve the technical problems, the technical scheme is that the spline sleeve and rotary gear assembly matched with the rock drill comprises a spline sleeve and a rotary gear, the rotary gear is fixedly sleeved outside the spline sleeve, the side profile of the spline sleeve comprises a plurality of curves A, a plurality of curves B and a plurality of curves C, the curves A are outwards convex circular arcs, the curves B are outwards convex circular arcs, the curves C are inwards concave circular arcs, the curves B are positioned at corners of the side profile of the spline sleeve, the curves A and the curves B are smoothly connected through the curves C, splines are arranged in the spline sleeve, the rotary gear comprises inner wheel faces, and the inner wheel faces are identical in shape and fit with the outer profile of the spline sleeve. Preferably, the curvatures of the curve a, the curve B, and the curve C are different from each other. Preferably, the number of the curves a and the number of the curves B are 4, and the number of the curves C is 8. Preferably, all the curves a have the same diameter, all the curves B have the same diameter, and all the curves C have the same diameter. Preferably, the curvature of the curve B is 1.7-2.2 times the curvature of the curve a. Preferably, the curvature of the curve C is 7-9 times the curvature of the curve a. Preferably, the number of the splines is 4, 6 or 8. Preferably, the spline sleeve material is copper or copper alloy. The utility model has the beneficial effects that: 1. By setting all the side profiles of the spline sleeve as curves, the overrun of single-side stress is avoided, and the four curves B and A of the side profile of the spline sleeve are smoothly transited through the curve C, so that stress concentration points at the joint of right angles or acute angles are eliminated. The convex circular arc surface is formed into a multidirectional force transmission path, when the slewing mechanism bears high torque, unilateral stress overrun can be avoided, power transmission smoothness is improved, the curve B at the circular angle is designed to be beneficial to optimizing stress distribution, stress concentration phenomenon is reduced, and radial force and bending from a drill rod can be better borne when the drill hole encounters deflection under working conditions. 2. Through setting up spline sleeve's side profile to full curve structure, the load that disperses received reduces fatigue strength failure risk, and then increase of service life. 3. The inner contour of the rotary gear is the same as the outer contour of the spline sleeve in shape and is attached. This conformal design increases the contact area during gear drive and reduces the abnormal wear caused by localized point contact. 4. The curve A and the curve B are designed into outwards protruding arc surfaces to form a multidirectional force transmission path, so that torsional rigidity and dynamic response are improved, and the protruding sections have larger moment of inertia and further have stronger resistance to torsional deformation. The multi-face engagement reduces angular fluctuation during rotation, and the rotation is smoother under impact load. 5. The arc transition structure curve C promotes the uniform distribution of lubricating oil on the matching surface, the friction coefficient can be effectively reduced by combining an oil-gas lubrication system, the deposition probability of rock fragments at the groove