Spline sleeve and rotating gear assembly used in cooperation with rock drill

Abstract

The utility model discloses a spline sleeve and rotary gear assembly used in cooperation with a rock drill, which 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 arcs protruding outwards, the curves B are arcs protruding outwards, and the curves C are arcs protruding outwards. The curve A is an arc protruding outwards, the curve C is an arc concave inwards, the curve B is located at the corner of the side face outline of the spline sleeve, the curve A and the curve B are in smooth connection through the curve C, a spline is arranged in the spline sleeve, the rotating gear comprises an inner gear face, and the inner gear face is provided with an outer gear face. The inner wheel face and the side face of the spline sleeve are the same in contour shape and are attached. According to the spline sleeve and the rotating gear used in cooperation with the rock drill, the outline of the side face of the spline sleeve is all set to be curves, angle fluctuation during rotation is reduced through multi-face meshing, and rotation is more stable under the impact load.

Description

Technical Field

[0001] This utility model relates to the field of rock drill technology, and in particular to a splined sleeve and rotary gear assembly used in conjunction with a rock drill. Background Technology

[0002] Rock drills, as specialized equipment for drilling into rocks, emerged to meet the demand for efficient and precise drilling in engineering projects. The core transmission structure of a rock drill is key to its drilling function, primarily responsible for converting the power source into the impact and rotational motion required for drilling, and transmitting force and motion to the drill bit through mechanical transmission components to break up the rock.

[0003] The existing rock drill transmission structure consists of a splined sleeve and a rotating gear. The outer contour of the splined sleeve is circular. Since the inner contour of the rotating gear and the outer contour of the splined sleeve are both circular, the angle of rotation of the rotating gear and the splined sleeve fluctuates greatly, resulting in unstable rotation under impact load.

[0004] Therefore, a splined sleeve and rotary gear assembly for use with a rock drill is proposed to solve the above problems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a splined sleeve and rotary gear assembly for use with a rock drill, so as to solve the problems existing in the background technology.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a splined sleeve and rotating gear assembly for use with a rock drill, comprising a splined sleeve and a rotating gear, wherein the rotating gear is fixedly sleeved on the outside of the splined sleeve, the side profile of the splined sleeve includes multiple curves A, multiple curves B and multiple curves C, wherein curve A is an outwardly convex arc, curve B is an outwardly convex arc, and curve C is an inwardly concave arc, wherein curve B is located at the corner of the side profile of the splined sleeve, and curves A and B are smoothly connected through curve C, wherein a spline is provided inside the splined sleeve, and the rotating gear includes an inner wheel surface, wherein the inner wheel surface has the same shape as and fits the outer profile of the splined sleeve.

[0007] Preferably, the curvatures of curve A, curve B, and curve C are different from each other.

[0008] Preferably, there are 4 curves A and 4 curves B, and 8 curves C.

[0009] Preferably, all curves A have the same diameter, all curves B have the same diameter, and all curves C have the same diameter.

[0010] Preferably, the curvature of curve B is 1.7-2.2 times that of curve A.

[0011] Preferably, the curvature of curve C is 7-9 times that of curve A.

[0012] Preferably, the number of splines is 4, 6 or 8.

[0013] Preferably, the spline sleeve is made of copper or a copper alloy.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting all the components of the spline sleeve's side profile as curves, unilateral stress exceeding limits is avoided. The four curves B and A of the spline sleeve's side profile smoothly transition through curve C, eliminating stress concentration points at right-angle or acute-angle connections. The convex arc surface forms a multi-directional force transmission path, preventing unilateral stress exceeding limits when the rotary mechanism is subjected to high torque, improving the smoothness of power transmission. The curve B design at the rounded corner helps optimize stress distribution and reduce stress concentration. Under operating conditions, when the borehole encounters deflection, it can better withstand radial forces and bending from the drill rod.

[0016] 2. By setting the side profile of the spline sleeve to a full curve structure, the load is distributed, the risk of fatigue failure is reduced, and the service life is extended.

[0017] 3. The inner contour of the rotating gear is identical in shape to and fits snugly with the outer contour of the spline sleeve. This conformal design increases the contact area during gear operation and reduces abnormal wear caused by localized point contact.

[0018] 4. Curves A and B are designed as outwardly convex arc surfaces, forming a multi-directional force transmission path, which improves torsional stiffness and dynamic response. The multiple convex sections have a larger moment of inertia, thus providing stronger resistance to torsional deformation. Multi-faceted meshing reduces angular fluctuations during rotation, resulting in smoother rotation under impact loads.

[0019] 5. The circular arc transition structure curve C promotes the uniform distribution of lubricating oil on the mating surface. Combined with the oil-air lubrication system, it can effectively reduce the coefficient of friction. The smooth contour reduces the probability of rock debris deposition in the groove. Combined with the high-pressure water flow of the flushing system, it can reduce the risk of abrasive wear.

[0020] 6. The outward-convex full-curve profile design disperses stress on one side of the spline sleeve, allowing it to withstand greater torque. The inward-concave transition arc curve C reduces the coefficient of friction and the probability of rock debris deposition, thereby improving the service life of the spline sleeve. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0022] Figure 1 This is a schematic diagram of the spline sleeve structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the side profile of the spline sleeve of this utility model.

[0024] Figure 3 This is a schematic diagram of the rotating gear structure of this utility model.

[0025] Figure 4 This is a schematic diagram of the impact mechanism structure of this utility model.

[0026] Figure 5 This is a schematic diagram of the explosion of the impact mechanism of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Chisel rod; 2. Spline sleeve; 21. Curve A; 22. Curve B; 23. Curve C; 24. Spline; 3. Rotary gear; 31. Gear tooth; 32. Gear rim; 33. Inner gear surface; 4. Drive gear; 5. Transmission shaft; 6. Coupling; 7. Hydraulic motor; 8. Rotary bushing; 9. Impact piston. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] Reference Figures 1 to 5This invention provides an embodiment of a splined sleeve and rotary gear assembly for use with a rock drill. The assembly includes a splined sleeve 2 and a rotary gear 3. The rotary gear 3 is fixedly sleeved on the outside of the splined sleeve 2. The side profile of the splined sleeve 2 includes multiple curves A21, B22, and C23. Curve A21 is an outwardly convex arc, curve B22 is an outwardly convex arc, and curve C23 is an inwardly concave arc. Curve B22 is located at the corner of the side profile of the splined sleeve 2. Curves A21 and B22 are smoothly connected by curve C23. A spline 24 is provided inside the splined sleeve 2. The rotary gear 3 includes an inner wheel surface 33, which has the same shape as and fits the outer profile of the splined sleeve 2. The side profile of the splined sleeve 2 refers to the cross-sectional profile along the axis, and the outer profile refers to the profile perpendicular to the side profile.

[0031] Specifically, the side profile of the spline sleeve 2 includes multiple curves A21, multiple curves B22, and multiple curves C23. All curves form a flower-shaped profile. All curves A21 have the same diameter, all curves B22 have the same diameter, and all curves C23 have the same diameter. The curvatures of curves A21, B22, and C23 are different. The curvature of curve B22 is 1.7-2.2 times that of curve A21, and the curvature of curve C23 is 7-9 times that of curve A21.

[0032] Specifically, there are 4 curves A21 and 4 curves B22, 8 curves C23, and an even number of splines 24, such as 4, 6, or 8.

[0033] Specifically, curve A21 and curve B22 are both outward-convex arcs, while curve C23 is an inward-concave arc. Curves A21 and B22 are smoothly connected by curve C23, with curve B22 located at the corner of the side profile of the spline sleeve 2. The convex arc surfaces A21 and B22 form a multi-directional force transmission path, which can prevent unilateral stress exceeding limits and improve the smoothness of power transmission when the rotary mechanism is subjected to high torque. The rounded corner design of curve C23 at the transition position of the side profile helps to optimize stress distribution and reduce stress concentration. Under working conditions, when the borehole encounters deflection, it can better withstand the radial force and bending from the drill rod.

[0034] Understandably, the convex arc curves B22 and A21 on the side profile of the spline sleeve 2 smoothly transition through the concave arc curve C23, eliminating stress concentration points at right-angle or acute-angle connections. The four arc surfaces form a multi-directional force transmission path, preventing unilateral stress overshoot when the rotary mechanism is subjected to high torque, improving power transmission smoothness, torsional stiffness, and dynamic response. The multi-faceted cross-section has a larger moment of inertia, stronger resistance to torsional deformation, and multi-faceted meshing reduces angular fluctuations during rotation, resulting in smoother rotation under impact loads.

[0035] It is understandable that traditional right angles are prone to lubrication dead zones. By using the concave arc transition structure curve C23, the lubricating oil is promoted to be evenly distributed on the mating surface. Combined with the oil-air lubrication system, the friction coefficient can be effectively reduced. The measured temperature rise is reduced by 15%-20%. The oil-air lubrication system is the rest of the structure on the rock drill and is existing technology. The specific structure and working principle do not affect the effect of this utility model and will not be described.

[0036] Understandably, the smooth contour curve C23 reduces the probability of rock debris deposition in the groove. Combined with the high-pressure water flow of the flushing system (water pressure typically >10MPa), it can reduce the risk of abrasive wear, increase service life, and lower maintenance costs. The flushing system is part of the rest of the rock drill's structure and is existing technology; its specific structure and working principle do not affect the effectiveness of this invention and will not be described further. Compared to the A22L / D hydraulic rock drill, the splined sleeve 2 in this invention extends the maintenance cycle by more than 50% under the same working conditions, and significantly reduces the frequency of spare parts replacement.

[0037] In some embodiments, curve A21 is designed as five, six... ten or more evenly distributed arc surfaces, and smoothly transitions to curve B22, which is a large transition arc at the four corners.

[0038] Specifically, the rotating gear 3 includes a rim 32 and teeth 31 fixed outside the rim 32. An inner wheel surface 33 is formed inside the rim 32, and the inner wheel surface 33 has the same shape as the outer contour of the spline sleeve 2 but fits snugly. This conformal design increases the contact area of ​​the rotating gear 3 when it rotates, and reduces abnormal wear caused by local point contact. Compared with the A22L / D hydraulic rock drill, the contact area is increased by about 30%-40%.

[0039] Specifically, the spline sleeve 2 is made of copper or a copper alloy, and the copper alloy includes elements such as copper, iron, zinc, and manganese.

[0040] Specifically, the impact mechanism includes a hydraulic motor 7 and a gear set consisting of gears, a transmission shaft 5, and a coupling 6. The output shaft of the hydraulic motor 7 is connected to the transmission shaft 5 through the coupling 6. A drive gear 4 is provided on the transmission shaft 5. The drive gear 4 meshes with a rotating gear 3. A spline sleeve 2 is provided inside the rotating gear 3. A chisel 1 is provided inside the spline sleeve 2.

[0041] Understandably, the hydraulic motor 7 drives the rotating gear 3 to rotate continuously via a gear set, which consists of a coupling 6, a transmission shaft 5, and a drive gear 4. The spline sleeve 2 is embedded in one end of the rotating gear 3. The four arcuate surfaces of the inner hole of the rotating gear 3 fit against the four arcuate surfaces of the outer side of the spline sleeve 2. During rotation, the friction generated by the four arcuate surfaces and the thrust between the edges efficiently and smoothly transmits a huge torque to the spline sleeve 2, which in turn drives the chisel 1 to rotate. The impact mechanism drives the impact piston 9 to perform high-frequency reciprocating linear motion. The impact piston 9 is connected to the inner hole of the pentagonal sleeve via a rotating bushing 8. This connection transmits rotation but allows axial relative sliding. When the impact piston 9 impacts forward, it causes the spline sleeve 2 to slide forward axially within the hole of the rotating gear 3, thus causing the spline sleeve 2 to rotate forward axially within the hole of the rotating gear 3. Throughout the process, the rotating gear 3 rotates continuously. The spline sleeve 2 rotates synchronously with the rotating gear 3 while smoothly sliding back and forth along the axial direction within the hole of the rotating gear 3.

[0042] During use, the rotating gear 3 is driven by the hydraulic motor 7 through the gear set. The inner hole contour is consistent with the outer contour of the sleeve. Its four arc inner hole surfaces provide a stable and precise channel for the axial sliding of the spline sleeve 2. The outer surface is a spline 24 for transmitting torque. The rotational motion of the hydraulic motor 7 is efficiently transmitted to the pentaangular spline sleeve 2 through the four protruding arc contact surfaces, and the power is output to the chisel 1.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A splined sleeve and rotary gear assembly for use with a rock drill, comprising a splined sleeve (2) and a rotary gear (3), wherein the rotary gear (3) is fixedly sleeved on the outside of the splined sleeve (2), characterized in that: The side profile of the spline sleeve (2) includes multiple curves A (21), multiple curves B (22) and multiple curves C (23). Curve A (21) is an outwardly convex arc, curve B (22) is an outwardly convex arc, and curve C (23) is an inwardly concave arc. Curve B (22) is located at the corner of the side profile of the spline sleeve (2). Curve A (21) and curve B (22) are smoothly connected by curve C (23). A spline (24) is provided inside the spline sleeve (2). The rotating gear (3) includes an inner wheel surface (33). The inner wheel surface (33) has the same shape as the outer profile of the spline sleeve (2) and fits it.

2. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: The curvatures of curves A (21), B (22), and C (23) are different from each other.

3. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: The number of curves A (21) and B (22) is 4 each, and the number of curves C (23) is 8.

4. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: All of the curves A(21) have the same diameter, all of the curves B(22) have the same diameter, and all of the curves C(23) have the same diameter.

5. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: The curvature of curve B(22) is 1.7-2.2 times that of curve A(21).

6. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: The curvature of curve C(23) is 7-9 times that of curve A(21).

7. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: The number of splines (24) is 4, 6 or 8.

8. The splined sleeve and rotary gear assembly for use with a rock drill according to claim 1, characterized in that: The spline sleeve (2) is made of copper or a copper alloy.

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