Rock drill transmission assembly, rock drill rotation system and rock drill

Abstract

The invention discloses a rock drilling machine transmission assembly, a rock drilling machine rotation system and a rock drilling machine. The rock drilling machine transmission assembly comprises a driven gear and a driving sleeve, and the outer contour of the driving sleeve is in clearance fit with an inner hole of the driven gear through a spline structure; a limiting structure used for axial guiding and circumferential limiting is arranged between the driving sleeve and the driven gear. The rock drill rotation system and the rock drill both comprise the rock drill transmission assembly. The spline structure is adopted between the outer contour of the driving sleeve and the inner hole of the driven gear, the problems of high machining cost, extremely high precision requirement and the like caused by the adoption of a prismatic structure are solved, meanwhile, on the premise that parts are not increased, the fit clearance generated by the spline structure is limited through the limiting structure, and the machining precision is improved. Therefore, the driving sleeve is stressed evenly, abrasion is smooth and even, and the service life of the rock drill can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of rock drills, and in particular to a rock drill transmission assembly, a rock drill rotation system and a rock drill. Background Art

[0002] As a key component of rock drilling equipment, a rock drill's core function is to break rock and form a drill hole through impact and rotation. Its rotary system consists of a motor, drive shaft, driving gear, driven gear, and drive sleeve. The motor in a rock drill is often bolted to the cylinder body, resulting in low transmission efficiency and susceptibility to high-frequency vibration and harsh external operating environments. This often leads to motor loosening and rock drill rotation failure due to broken motor mounting bolts or loose nuts. The drive sleeve, on the other hand, connects to the driven gear and rotates the drill adapter. Its inner profile is a spline for mounting the adapter, while its outer profile is a ribbed or splined structure for connecting to the driven gear. A ribbed outer profile requires extremely high machining costs and precision. A splined outer profile, while less demanding, results in a clearance fit. This clearance causes misalignment between the two, and when the rock drill is operating, the impact piston and the drill adapter are also misaligned. This results in uneven force on the drive sleeve, severe wear, and a shorter lifespan.

[0003] The existing technology lacks a corresponding optimization method to address the problem of rock drill rotation failure caused by the looseness of the external motor, and can only reduce its frequency by improving the processing quality of fasteners. To address the problem of the drive sleeve, the existing utility model patent with authorization announcement number CN220286236 U discloses a drive sleeve with an involute spline structure. Its inner profile is still a spline, but multiple positioning members are set between the outer profile transmission gear to keep the two coaxial and fixed. This can increase the service life of the drive sleeve. However, this patent achieves the purpose of limiting the coaxiality of the drive sleeve and the driven gear by adding structural members, which also introduces the risk of positioning member failure and causing rock drill failure.

[0004] In summary, existing rock drill motors are externally mounted, prone to loosening, have a high frequency of slewing failures, and exhibit low transmission efficiency. The prismatic outer profile of the drive sleeve requires high machining requirements, and the spline structure is prone to wear and has a short lifespan. Therefore, designing a new rock drill slewing system is essential.

[0005] It should be noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or implication in any form that the above technical information constitutes prior art already known to those skilled in the art. Summary of the Invention

[0006] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a rock drill transmission assembly, a rock drill rotation system and a rock drill, and the technical problem to be solved is: how to improve the reliability of the rock drill rotation and impact.

[0007] The technical solution of the present invention is: A rock drill transmission assembly includes a driven gear and a drive sleeve. A spline structure provides a clearance fit between the outer contour of the drive sleeve and the inner bore of the driven gear. A retaining structure for axial guidance and circumferential limiting is provided between the drive sleeve and the driven gear. This technical solution employs a spline structure between the outer contour of the drive sleeve and the inner bore of the driven gear, avoiding the high processing costs and extremely high precision requirements associated with a prismatic structure. Furthermore, the retaining structure limits the clearance created by the spline structure, ensuring uniform force distribution on the drive sleeve and gentle, even wear, thereby extending the life of the rock drill.

[0008] On the basis of the above technical solution, as a preferred technical solution for using a rock drill transmission assembly, the limiting structure includes a plane structure provided on the outer contour and a flat key protrusion provided on the inner hole. When the driving sleeve and the driven gear are clearance-matched through the spline structure, the plane structure and the flat key protrusion are slidingly matched along the axial direction of the drill tail and stop-matched in the circumferential direction of the drill tail.

[0009] Based on the above technical solution, as a preferred technical solution for using a rock drill transmission assembly, the gap between the planar structure and the flat key protrusion is less than 0.5 mm. Preferably, the gap between the planar structure and the flat key protrusion is between 0.2 mm and 0.5 mm.

[0010] On the basis of the above technical solution, as a preferred technical solution for using a rock drill transmission assembly, the inner diameter of the first end of the driven gear is larger than the inner diameter of the spline structure in the inner hole, the first end of the drive sleeve is a step structure adapted to the first end of the driven gear, the plane structure is arranged at the step structure of the drive sleeve, and the flat key protrusion is arranged at the first end of the driven gear; or the plane structure is arranged at the spline root of the drive sleeve, and the flat key protrusion is arranged at the spline root of the driven gear.

[0011] A rock drill rotation system comprises a rock drill transmission assembly as described in any of the above-mentioned technical solutions, further comprising a motor, a drive shaft, and a driving gear connected in sequence, wherein the driving gear drives the drill adapter via a driven gear and a drive sleeve. In this technical solution, a spline structure is employed between the outer contour of the drive sleeve and the inner bore of the driven gear, avoiding the high processing costs and extremely high precision requirements associated with a prismatic structure. Furthermore, a limiting structure limits the clearance created by the spline structure, thereby ensuring uniform force distribution on the drive sleeve and gentle and even wear, thereby extending the life of the rock drill.

[0012] Based on the above technical solution, as a preferred technical solution for a rock drill rotation system, the motor is built into the cylinder housing of the impact piston, and the inner cavity is connected to the motor's oil inlet and outlet. This technical solution not only improves the reliability of the rock drill's rotation and impact in two ways, but also coordinates these two aspects to fully ensure the reliability of the rock drill's rotation and impact. The first is the matching relationship between the driven gear and the drive sleeve in the rock drill's transmission assembly, and the second is the structure of the motor built into the cylinder housing.

[0013] On the basis of the above technical solution, as a preferred technical solution for using a rock drill rotary system, the motor is circumferentially positioned by an inner cavity provided on the cylinder housing, the inner cavity is provided with a threaded hole, and the motor is fixed in the inner cavity by a screw adapted to the threaded hole.

[0014] On the basis of the above technical solution, as a preferred technical solution for using a rock drill rotary system, four screws are provided and respectively connected to the four corners of the motor, and the gear housing is connected to the cylinder housing and is used to press the motor in the inner cavity.

[0015] On the basis of the above technical solution, as a preferred technical solution for using a rock drill rotary system, one end of the transmission shaft is connected to the motor through an internal spline, and the other end is connected to the driving gear through an external spline, and the drive sleeve is connected to the drill tail through an internal spline.

[0016] A rock drill comprises a head housing, a gear housing and a cylinder housing connected in sequence, and includes the rock drill rotation system described in any of the above technical solutions, wherein the impact piston connected to the cylinder housing is coaxial with the drill tail connected to the head housing.

[0017] Compared with the prior art, the rock drill rotation system and rock drill proposed in this invention effectively address the existing problems of low external transmission efficiency of rock drill motors, frequent rotation failures caused by loose motor fasteners, and high machining difficulty, rapid wear, and short lifespan due to the use of prismatic or splined structures on the outer profile of the drive sleeve. The present invention optimizes both the rock drill motor mounting structure and the drive sleeve structure. The motor is built into the cylinder, making its reliability unaffected by the external environment and equipment vibration. The splined outer profile of the drive sleeve incorporates a limiting feature, making it easier to machine and extending its lifespan. These improvements contribute significantly to improving rock drill reliability. It should be particularly emphasized that excessive wear of the outer spline of the drive sleeve will accelerate the wear and deformation of the inner spline, thereby increasing the rotational resistance, causing an abnormal increase in the motor load torque, which may damage the motor bearings or stator in the long term, and thus cause unstable motor output torque; and unstable torque will cause the drive sleeve spline to be subjected to alternating stress, accelerating tooth surface wear and even local peeling; the spline boss in the present invention has a limiting function, the outer spline teeth wear more regularly, and the service life is longer, which can alleviate the above phenomenon. At the same time, the reliability and output torque of the motor built-in solution are more stable, and the drive sleeve is subjected to load and wear regularly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 It is a structural diagram of a rock drill; Figure 2 This is a schematic diagram of the structure after the cylinder housing, impact piston and motor are assembled; Figure 3 for Figure 2 Schematic diagram of the structure of the cylinder housing; Figure 4 for Figure 3 Front view of Figure 5 For motor assembly Figure 1 ; Figure 6 For motor assembly Figure 2 ; Figure 7 This is an assembly diagram of the driving sleeve and the driven gear embodiment 1; Figure 8 for Figure 7 Schematic diagram of the structure of the driven gear; Figure 9 for Figure 7 Schematic diagram of the structure of the middle drive sleeve; Figure 10 It is a cross-sectional view of the second embodiment of the driving sleeve and the driven gear.

[0020] Description of Figure Numbers: 1-head housing; 2-gear housing; 3-cylinder housing; 301-inner cavity; 302-threaded hole; 303-screw; 4- Impact piston; 5-motor; 501-oil inlet; 502-oil outlet; 6- transmission shaft; 7- driving gear; 8-driven gear; 801-inner hole; 802-flat key protrusion 1; 803-flat key protrusion 2; 9-driving sleeve; 901-outer contour; 902-plane structure 1; 903-plane structure 2; 10-Socket tail. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the core concept of the present invention and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present application provides these embodiments to make this application thorough and complete, and to fully express the scope of this application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0023] It should be noted that, in the description of this application, unless otherwise specified, "several" means greater than or equal to two; the terms "upper," "lower," "left," "right," "inner," "outer," "axial," "radial," and the like, indicating orientations or positional relationships, are intended solely to facilitate the description of this application and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] In addition, the terms "first," "second," and similar terms used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the word include the elements listed after the word, and do not exclude the possibility of other elements being included.

[0025] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0026] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0028] One object of the present invention is to provide a new rock drill to solve the problems in the prior art of low transmission efficiency when the rock drill motor is external, frequent rotation failures caused by loosening of fasteners, and high processing difficulty, rapid wear and short service life caused by the use of a prismatic or spline structure on the outer contour of the drive sleeve.

[0029] Core invention point 1: The motor is built into the cylinder body, and the working process is no longer affected by the external environment and high-frequency vibration. Compared with the external motor, the transmission efficiency of the built-in motor is more efficient and reliable.

[0030] Core invention point 2: The outer contour of the drive sleeve adopts a spline form, and a limiting structure is designed at the same time, which reduces the processing difficulty and extends the service life.

[0031] The specific embodiments are as follows: A rock drill transmission assembly, such as Figure 1 and Figure 2 As shown, it includes a driven gear 8 and a drive sleeve 9. As an essential transmission component in a rock drill, the functional objectives of the driven gear 8 and the drive sleeve 9 in this embodiment are the same as those in the prior art, the difference being the matching structure between the driven gear 8 and the drive sleeve 9.

[0032] like Figures 7 to 9 As shown, the outer profile 901 of the drive sleeve 9 and the inner bore 801 of the driven gear 8 are loosely fitted via a spline structure. A retaining structure is provided between the drive sleeve 9 and the driven gear 8 for axial guidance and circumferential limiting. While the spline assembly creates a clearance between the driven gear 8 and the drive sleeve 9, the retaining structure compensates for this clearance, ensuring reliable transmission between the two. Furthermore, no new components are introduced, minimizing the risk of failure and naturally avoiding the increased failure rate of the rock drill due to an excessive number of components.

[0033] That is, a spline structure is adopted between the outer contour 901 of the driving sleeve 9 and the inner hole 801 of the driven gear 8 in this embodiment, thereby avoiding the problems of high processing cost and extremely high precision requirements caused by the use of a prismatic structure. At the same time, the fitting clearance generated by the spline structure is limited by the limiting structure, so that the driving sleeve 9 is evenly stressed and wears smoothly and evenly, which can extend the life of the rock drill.

[0034] On the basis of the above embodiment, as a preferred embodiment of using the rock drill transmission assembly, Figure 8 and Figure 9 As shown, the limiting structure includes a plane structure provided on the outer contour 901 and a flat key protrusion provided on the inner hole 801. When the driving sleeve 9 and the driven gear 8 are clearance-fitted through the spline structure, the plane structure and the flat key protrusion are slidingly fitted along the axial direction of the shank 10 and stop-fitted in the circumferential direction of the shank 10.

[0035] This embodiment provides a preferred implementation of the limiting structure, namely, a planar structure that matches the flat key protrusion. Since the outer contour 901 of the drive sleeve 9 and the inner hole of the driven gear 8 are both cylindrical, the planar structure and the flat key protrusion match, achieving both axial guidance and circumferential stopping.

[0036] As for the specific location of the planar structure and the flat key protrusion, there are many options, such as being located at the front end of the driving sleeve 9 and the driven gear 8, or at the rear end of the driving sleeve 9 and the driven gear 8, or between the two ends of the driving sleeve 9 and the driven gear 8. Preferably, the planar structure and the flat key protrusion are located at the end.

[0037] Based on the above embodiment, as a preferred embodiment of a rock drill transmission assembly, the gap between the planar structure and the flat key protrusion is less than 0.5 mm. Preferably, the gap between the planar structure and the flat key protrusion is between 0.2 mm and 0.5 mm.

[0038] Based on the above embodiment, as a preferred embodiment for a rock drill transmission assembly, the inner diameter of the first end of the driven gear 8 is larger than the inner diameter of the spline structure in the inner bore 801, i.e., the wall thickness of the first end is thinner, and a radial step exists between the first end and the internal spline structure. The first end of the drive sleeve 9 has a stepped structure adapted to fit the first end of the driven gear 8. This stepped structure forms a relatively radially outwardly convex end flange between the spline structure on the outside of the drive sleeve 9.

[0039] The flat structure is arranged at the step structure of the driving sleeve 9, that is, located on the outer circumference of the step structure, and the circumferential surface connected to the step structure is cut into a combination of an arc surface and a flat surface. The flat key protrusion is arranged at the first end of the driven gear 8, that is, the flat key protruding from the inner hole 801 of the first end of the driven gear 8. Figure 8 and Figure 9 As shown, the plane structure and the flat key protrusion in this embodiment are respectively recorded as plane structure one 901 and flat key protrusion one 801.

[0040] Alternatively, as another alternative embodiment, the plane structure and the flat key protrusion are located at the other end of the above structure, that is, the plane structure is arranged at the spline root of the driving sleeve 9, and the flat key protrusion is arranged at the spline root of the driven gear 8. Figure 10 As shown, the plane structure and the flat key protrusion in this embodiment are respectively recorded as plane structure two 902 and flat key protrusion two 802.

[0041] A rock drill rotation system, such as Figure 1 As shown, the rock drill transmission assembly includes any one of the above embodiments, and further includes a motor 5, a transmission shaft 6, and a driving gear 7 that are sequentially connected to each other. The driving gear 7 drives the drill tail 10 through the driven gear 8 and the drive sleeve 9.

[0042] In this embodiment, a spline structure is adopted between the outer contour 901 of the driving sleeve 9 and the inner hole 801 of the driven gear 8, thereby avoiding the problems of high processing cost and extremely high precision requirements caused by the use of a prismatic structure. At the same time, the fitting clearance generated by the spline structure is limited by a limiting structure, so that the driving sleeve 9 is evenly stressed and wears gently and evenly, which can extend the life of the rock drill.

[0043] On the basis of the above embodiment, as a preferred embodiment of the rock drill rotary system, Figures 2 to 4As shown, the motor 5 is built into the cylinder housing 3 of the impact piston 4. The inner cavity 301 is connected to the oil inlet 501 and oil outlet 502 for the motor 5. This embodiment not only improves the reliability of the rock drill's rotation and impact in two ways, but also coordinates these two aspects to fully ensure the reliability of the rock drill's rotation and impact. The first is the matching relationship between the driven gear 8 and the drive sleeve 9 in the rock drill's transmission assembly, and the second is the structure of the motor 5 built into the cylinder housing 3.

[0044] On the basis of the above embodiment, as a preferred embodiment of using the rock drill rotary system, Figures 3 to 6 As shown, the motor 5 is circumferentially positioned by an inner cavity 301 provided on the cylinder housing 3 . The inner cavity 301 is provided with a threaded hole 302 . The motor 5 is fixed in the inner cavity 301 by a screw 303 adapted to the threaded hole 302 .

[0045] On the basis of the above embodiment, as a preferred embodiment of the rock drill rotary system, Figure 4 and Figure 5 As shown, four screw rods 303 are provided and are respectively connected to the four corners of the motor 5 . The gear housing 3 is connected to the cylinder housing 3 and is used to press the motor 5 in the inner cavity 301 .

[0046] Based on the above embodiment, as a preferred embodiment of the rock drill rotation system, one end of the transmission shaft 6 is connected to the motor 5 through an internal spline, and the other end is connected to the driving gear 7 through an external spline, and the drive sleeve 9 is connected to the drill tail 10 through an internal spline.

[0047] A rock drill, such as Figures 1 to 10 As shown, it includes a head housing 1, a gear housing 2 and a cylinder housing 3 connected in sequence, including the rock drill rotation system described in any of the above embodiments, and the impact piston 4 connected to the cylinder housing 3 is coaxial with the drill tail 10 connected to the head housing 1.

[0048] On the basis of the above embodiments, as a preferred embodiment of the rock drill, the purpose is to provide a rock drill with a built-in motor, a drive sleeve with low machining difficulty and a long service life.

[0049] In order to achieve the above-mentioned object, the rock drill of the present invention comprises: a head housing 1, a gear housing 2, and a cylinder housing 3, which are composed of the entire housing of the rock drill and are connected by bolts; a motor 5, which is built into the cylinder housing and connected by bolts; a transmission shaft 6, which passes through the gear box 2, is connected to the motor 5 at one end and to the driving gear 7 at the other end; the driving gear 7 is installed in the gear box 2 and cooperates with the driven gear 7 for transmission; a driven gear 8 is built into the gear box 2; a drive sleeve 8 is installed in the driven gear 8 and drives the drill tail 10 to rotate; an impact piston 4 is installed in the cylinder body and is coaxial with the drill tail 10; and the drill tail 10 is installed in the head 1.

[0050] In this embodiment, as described above, the head housing 1, the gear box housing 2, and the cylinder housing 3 are the outer shell of the rock drill, and the motor 5, the transmission shaft 6, the driving gear 7, the driven gear 8, the drive sleeve 9, the impact piston 4, the drill tail 10 and other structures are all located in the housing.

[0051] The motor 5 is bolted to the cylinder body, which has a corresponding internal cavity for mounting the motor. The cavity's contour matches the motor's shape and features threaded holes for mounting the motor. To reduce the number of parts required for motor 5, the cylinder body serves as the motor housing, with oil inlet and outlet ports located on the sides of the cavity. This design allows the motor 5 to be bolted in place while also being compressed by the gearbox 2, eliminating the possibility of axial movement. Furthermore, the motor's contours are designed to be curved, similar to the internal contours of the cylinder's mounting cavity, preventing the motor from rotating.

[0052] The above design not only reduces the impact of external environmental and equipment vibration on motor operation, improving reliability, but also shortens the motor's transmission path, increasing transmission efficiency. Drive shaft 6 is designed with internal and external splines at both ends, one end connected to the motor and the other to the driving gear. The motor torque is transmitted through the drive shaft to the driving gear and then to the driven gear. The inner bore of the driven gear and the outer contour of the drive sleeve are designed as splines, with a clearance fit between the two splines.

[0053] A step is designed at the mounting end of the driven gear and the driving sleeve, a flat key protrusion is designed at the step of the driven gear, and the step of the driving sleeve is flattened accordingly. The step is clearance-fitted, and the clearance value is less than 0.2~0.5mm. This can effectively solve the problem of misalignment between the impact piston and the drill tail and uneven force on the driving sleeve caused by the gap between the driven gear and the driving sleeve when the driven gear and the driving sleeve are simply spline-fitted, thereby reducing the abnormal wear rate of the spline and improving the service life of the driving sleeve.

[0054] The rock drill of this embodiment is as follows Figures 1 to 9 As shown, the shank mainly comprises a head housing 1, a gearbox housing 2, a cylinder housing 3, a motor 5, a transmission shaft 6, a driving gear 7, a driven gear 8, a drive sleeve 9, an impact piston 4, and a shank adapter 10. The housings are connected by bolts; the motor is bolted to the cylinder cavity; the transmission shaft passes through the gearbox 2, with one end connected to the motor 5 and the other to the driving gear 7, transmitting the motor torque to the gears; the driving gear 7 and the driven gear 8 are installed in the gearbox 2, and the two cooperate to drive the shank adapter; the drive sleeve 9 is installed in the driven gear 8, driving the shank adapter to rotate; the impact piston 4 is installed in the cylinder, performing reciprocating motion, and the shank adapter is coaxial, breaking the rock by impacting the shank adapter.

[0055] When the rock drill of the present invention is in use, the impact piston is hydraulically controlled to perform high-frequency reciprocating motion. The impact piston is coaxial with the shank and can drive the shank to perform high-frequency impact. At the same time, the motor can provide rotational torque to drive the shank to rotate. The combined action of the shank's composite motion breaks the rock. Compared to the prior art, the motor of the present invention is built-in and connected to the cylinder cavity by bolts. This design form is fixed by bolts and compressed by the gearbox at the same time, so there is no possibility of axial movement. At the same time, the motor contour and the cylinder mounting cavity contour are designed to be arc-shaped, avoiding the possibility of motor rotation. The above design not only avoids the influence of external environment and equipment vibration on the operation of the motor, thereby improving its reliability, but also shortens the motor transmission path and improves transmission efficiency. In addition, the connection between the driven gear and the driving sleeve is in the form of a spline. At the same time, steps are designed at the mounting ends of the driven gear and the driving sleeve. A flat key protrusion is designed at the step of the driven gear, and the step of the driving sleeve is correspondingly flattened. The step is clearance-fitted, and the clearance value is less than 0.5mm. This can effectively solve the problem of misalignment between the impact piston and the drill tail and uneven force on the driving sleeve caused by the gap between the driven gear and the driving sleeve when the driven gear and the driving sleeve are simply spline-fitted, thereby reducing the abnormal wear rate of the spline and improving the service life of the driving sleeve.

[0056] In the present invention, the motor is built into the cylinder body, and its reliability is no longer affected by the external environment and equipment vibration, and the transmission efficiency is higher; the outer contour of the drive sleeve adopts a spline while adding a limiting feature, which reduces the processing difficulty and extends the service life. The above improvements have a positive effect on improving the reliability of the rock drill.

[0057] Therefore, according to the present invention, the installation form of the rock drill motor and the drive sleeve structure are optimized accordingly; the motor is built into the cylinder body, and the reliability is no longer affected by the external environment and equipment vibration, and the transmission efficiency is higher; the outer contour of the drive sleeve adopts splines while adding limiting features, which reduces the processing difficulty and extends the service life. The above improvements have a positive effect on improving the reliability of the rock drill.

[0058] Any details not provided in the present invention are conventional technical means known to those skilled in the art.

[0059] The above content shows and describes the basic principles, main features and beneficial effects of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A rock drill transmission assembly, comprising a driven gear (8) and a drive sleeve (9), characterized in that: The outer contour (901) of the driving sleeve (9) and the inner hole (801) of the driven gear (8) are clearance-fitted via a spline structure, and a limiting structure for axial guidance and circumferential limiting is provided between the driving sleeve (9) and the driven gear (8).

2. The rock drill transmission assembly according to claim 1, characterized in that: The limiting structure includes a plane structure provided on the outer contour (901) and a flat key protrusion provided on the inner hole (801). When the driving sleeve (9) and the driven gear (8) are fitted through the clearance of the spline structure, the plane structure and the flat key protrusion are fitted in a sliding manner along the axial direction of the shank (10) and are fixed in a circumferential direction of the shank (10).

3. The rock drill transmission assembly according to claim 2, characterized in that: The gap between the planar structure and the flat key protrusion is less than 0.5 mm.

4. The rock drill transmission assembly according to claim 2 or 3, characterized in that: The inner diameter of the first end of the driven gear (8) is larger than the inner diameter of the spline structure in the inner hole (801), the first end of the driving sleeve (9) is a step structure adapted to the first end of the driven gear (8), the plane structure is arranged at the step structure of the driving sleeve (9), and the flat key protrusion is arranged at the first end of the driven gear (8); Alternatively, the planar structure is arranged at the spline root of the drive sleeve (9), and the flat key protrusion is arranged at the spline root of the driven gear (8).

5. A rock drill rotation system, characterized by: The rock drill transmission assembly comprises the rock drill transmission assembly according to any one of claims 1 to 5, and further comprises a motor (5), a transmission shaft (6), and a driving gear (7) which are sequentially connected to each other, wherein the driving gear (7) drives the drill tail (10) through the driven gear (8) and the drive sleeve (9).

6. The rock drill rotation system according to claim 5, characterized in that: The motor (5) is built into the cylinder housing (3) of the impact piston (4), and the inner cavity (301) is connected to an oil inlet (501) and an oil outlet (502) for the motor (5).

7. The rock drill rotation system according to claim 6, characterized in that: The motor (5) is circumferentially positioned by an inner cavity (301) provided on the cylinder housing (3); the inner cavity (301) is provided with a threaded hole (302); and the motor (5) is fixed in the inner cavity (301) by a screw (303) adapted to the threaded hole (302).

8. The rock drill rotation system according to claim 7, characterized in that: Four screw rods (303) are provided and are respectively connected to the four corners of the motor (5). The gear housing (3) is connected to the cylinder housing (3) and is used to press the motor (5) in the inner cavity (301).

9. The rock drill rotation system according to any one of claims 5 to 8, characterized in that: One end of the transmission shaft (6) is connected to the motor (5) via an internal spline, and the other end is connected to the driving gear (7) via an external spline. The drive sleeve (9) is connected to the shank (10) via an internal spline.

10. A rock drill comprising a head housing (1), a gear housing (2) and a cylinder housing (3) connected in sequence, characterized in that: The rock drill rotary system comprises the rock drill rotary system according to any one of claims 5 to 9, wherein the impact piston (4) connected to the cylinder housing (3) is coaxial with the drill tail (10) connected to the head housing (1).

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