Rotary impact hydraulic drill provided with a shank equipped with a coupling spline

Abstract

The rotary impact hydraulic drill (2) comprises: - a main body (3); - a shank (13) coupled to at least one drilling bar equipped with a tool - the shank (13) comprises a coupling portion including a female coupling spline (16) and a male coupling spline (17) that are angularly offset from each other with respect to the extension axis of the shank (13); - a striking piston (5) slidably mounted inside the main body (3) along a striking axis (A) and configured to strike the shank (13); - a rotary drive device (18) configured to rotate the shank (13) around a rotation axis substantially corresponding to the striking axis - the rotary drive device (18) comprises a coupling member (19) disposed around the shank (13), wherein the coupling member (19) is a male member that is rotatably coupled to the female and male coupling splines (16, 17) of the shank (13), respectively Includes coupling splines and female coupling splines -;and - includes a front contact surface (23) fixed to the main body (3), the front contact surface (23) is annular and extends around the shank (13), and the shank (13) is configured to contact the front contact surface (23) to limit the forward displacement stroke of the shank (13), the shank (13) includes an annular bearing flange (24) provided on the outer surface of the shank (13), and the annular bearing flange includes an annular bearing surface (25) configured to contact the front contact surface (23), and each of the female and male coupling splines (16, 17) provided on the shank (13) extends from the annular bearing flange (24) in the direction of the striking piston (5), and each female coupling spline (16) provided on the shank (13) has a bottom surface (27) and each bottom surface (27) annular It includes a connecting surface (28) connected to a bearing flange (24), the connecting surface extending forward away from the extension axis of the shank (13), and the connecting surface (28) of each female coupling spline (16) provided on the shank (13) is at least partially formed by a curved concave surface (28.1) that extends substantially in the extension direction of each female coupling spline, and the curved concave surface has a radius of curvature (R) smaller than the radial height (Hr) of each male coupling spline provided on the shank (13).

Description

Technology Field

[0001] The present invention relates particularly to a rotary impact hydraulic drill used in drilling equipment. Background Technology

[0002] A drilling apparatus comprises a rotary impact hydraulic drill that is slidably mounted on a slide in a known manner and drives one or more drilling bars, the last of which has a tool called a cutting edge that contacts the rock. The purpose of such a drill is, generally, to bore a hole of some depth to allow for the placement of an explosive charge inside. Thus, the drill is a key component of the drilling apparatus, which, on the one hand, provides rotary and impact settings to the cutting edge via the drilling bar to bore through the rock, and on the other hand, provides an injection fluid to extract fragments from the bore hole.

[0003] A rotary impact hydraulic drill, in particular, comprises, on the one hand, a striking device including a striking piston configured to strike a shank coupled to a drilling bar in each operating cycle of the drill, driven by one or more hydraulic fluid flow rates coming from a main hydraulic supply circuit, and on the other hand, a rotary drive device configured to rotate the shank and the drilling bar, equipped with a hydraulic rotary motor.

[0004] The rotary drive unit includes a coupling member positioned particularly around a shank, the coupling member comprising a male coupling spline and a female coupling spline that are respectively rotatably coupled to a female coupling spline and a male coupling spline provided on the outer surface of the shank. The female and male coupling splines provided on the shank extend substantially parallel to the extension axis of the shank and are angularly offset from each other with respect to the extension axis of the shank.

[0005] When the cutting edge is blocked in the rock, the rotary impact hydraulic drill is retracted until the front end of the male coupling spline provided on the shank contacts the front contact surface provided on the front contact member that is fixed to the body of the rotary impact hydraulic drill.

[0006] Next, to unlock the tool, the rotary drive and / or striking device may be activated to rotate the shank and / or strike the shank with the striking piston.

[0007] Such activation of the rotary drive device and / or striking device causes rotational friction of the male coupling spline provided on the shank against the front contact surface and / or axial impact of the male coupling spline provided on the shank against the front contact surface.

[0008] However, these repetitive axial impacts and rotational frictions cause rapid wear of the male coupling splines equipped on the shank, requiring the shank to be replaced frequently. In addition, such wear of the male coupling splines generates chips that can get stuck between the different moving parts of the rotary impact hydraulic drill and potentially damage those parts. The problem to be solved

[0009] The present invention aims to improve all or part of these disadvantages. means of solving the problem

[0010] Accordingly, the technical problem underlying the present invention is to provide a rotary impact hydraulic drill that is simple in structure, economical, highly reliable, and compact.

[0011] To this end, the present invention relates to a rotary impact hydraulic drill, wherein the drill is,

[0012] - Main body;

[0013] - A shank coupled to at least one drilling bar equipped with a tool - The shank comprises a coupling portion including a female coupling spline and a male coupling spline that are angularly offset from each other with respect to the extension axis of the shank -;

[0014] - A striking piston slidably mounted inside the main body along the striking axis and configured to strike the shank;

[0015] - A rotary drive device configured to rotate a shank around a rotation axis substantially aligned with a striking axis - The rotary drive device comprises a coupling member disposed around the shank, wherein the coupling member comprises a male coupling spline and a female coupling spline rotatably coupled to the female and male coupling splines of the shank, respectively -; and

[0016] - Includes a front contact surface fixed to the main body,

[0017] The forward contact surface is annular and extends around the shank, and the shank is configured to contact the forward contact surface to limit the forward displacement stroke of the shank, and

[0018] The shank includes an annular bearing flange provided on the outer surface of the shank, the annular bearing flange includes an annular bearing surface configured to contact a forward contact surface, each of the female and male coupling splines provided on the shank extends from the annular bearing flange in the direction of a striking piston, each female coupling spline provided on the shank includes a bottom surface and a connecting surface connecting each bottom surface to the annular bearing flange, the connecting surface extends forward away from the extension axis of the shank, and the connecting surface of each female coupling spline provided on the shank is at least partially formed by a curved concave surface extending substantially in the extension direction of each female coupling spline, the curved concave surface having a radius of curvature smaller than the radial height of each male coupling spline provided on the shank.

[0019] If such annular bearing flanges are present on the front portions of the female and male coupling splines provided on the shank, contact between the front contact surface and the male coupling spline provided on the shank can be prevented, and thus the integrity of the shank can be maintained.

[0020] In addition, if there is an annular bearing surface on the annular bearing flange, a relatively large contact area between the front contact surface and the annular bearing flange is ensured, so the impact force and / or friction force applied to the front contact surface by the shank is better distributed.

[0021] Accordingly, a specific configuration of the rotary impact hydraulic drill according to the present invention can significantly increase the lifespan of the shank, thereby significantly reducing the time required to replace the shank and the risk of damage to the drill that could affect user safety.

[0022] In addition, if the male coupling spline provided on the shank extends directly from the annular bearing flange, the axial length of the shank is not affected by the presence of the annular bearing flange, and thus, a compact rotary impact hydraulic drill can be obtained. By the fact that each female coupling spline provided on the shank includes a connecting surface formed at least partially by a curved concave surface having a small radius of curvature, the axial length of the shank can be further reduced, and thus the compactness of the rotary impact hydraulic drill can be further increased.

[0023] By a specific configuration of the connection surface of each female coupling spline provided to the shank, the presence of sharp angles that could cause high stress on the shank during the operation of the drill and lead to the shank's rupture can be avoided.

[0024] A rotary impact hydraulic drill may have one or more of the following features, either alone or in combination.

[0025] According to one embodiment of the present invention, the female and male coupling splines provided on the shank extend substantially parallel to the extension axis of the shank.

[0026] According to one embodiment of the present invention, the connecting surface of each female coupling spline provided in the shank is formed entirely by each curved concave surface.

[0027] According to one embodiment of the present invention, the annular bearing flange has a maximum outer diameter greater than or equal to the outer diameter of the coupling portion. By configuring the coupling portion in this way, the cross-section of the shank in the coupling portion can be reduced, and thus the cross-section of the coupling member can be reduced while maintaining a large protective surface. Therefore, by this arrangement, it is possible to reduce the footprint of the rotary impact hydraulic drill according to the present invention.

[0028] According to one embodiment of the present invention, the front end of each female coupling spline provided on the shank is provided on an annular bearing flange. According to one variation of the present invention, the front end of each female coupling spline provided on the shank may be adjacent to the annular bearing flange.

[0029] According to one embodiment of the present invention, the front end of each male coupling spline provided on the shank is adjacent to an annular bearing flange.

[0030] According to one embodiment of the present invention, each male coupling spline provided in the shank includes a normal surface extending from an annular bearing flange.

[0031] According to one embodiment of the present invention, for each male coupling spline provided in a shank, the radial distance between the extension axis of the shank and the normal surface of the male coupling spline is substantially constant along the male coupling spline.

[0032] According to one embodiment of the present invention, the radius of curvature of each curved concave surface is less than 15 mm, for example, less than 10 mm. Due to these values ​​of the radius of curvature of the curved concave surface of each female coupling spline provided on the shank, it is possible to reduce the connection length between the bearing flange and the other coupling spline provided on the shank, and thus reduce the length of the shank. Thus, by this arrangement, it is possible to increase the compactness of the rotary impact hydraulic drill according to the present invention.

[0033] According to one embodiment of the present invention, the connecting surface of each female coupling spline provided in the shank comprises an inclined surface that is inclined with respect to the extension axis of the shank and diverges in the direction of the forward contact surface. Advantageously, the inclined surface extends as an extension of a curved concave surface and in the direction of the forward end of the shank.

[0034] According to one embodiment of the present invention, an annular bearing flange includes an outer peripheral surface that is generally cylindrical.

[0035] According to one embodiment of the present invention, the front end of each female coupling spline provided in the shank is open into the outer surface of the annular bearing flange.

[0036] According to one embodiment of the present invention, the front end of each female coupling spline provided in the shank is open into the outer peripheral surface.

[0037] According to one embodiment of the present invention, the outer peripheral surface extends as an extension of the annular bearing surface in the direction of the striking piston.

[0038] According to one embodiment of the present invention, the front end of each female coupling spline provided in the shank is open into the annular bearing surface of the annular bearing flange.

[0039] According to one embodiment of the present invention, the radial height of the annular bearing flange at the exit of the front end of each female coupling spline provided in the shank is greater than 50% of the maximum radial height of the annular bearing flange, for example, 60% or 70% or more.

[0040] According to one embodiment of the present invention, each female coupling spline provided in the shank comprises two lateral surfaces that extend in the longitudinal direction and are substantially parallel.

[0041] According to one embodiment of the present invention, the annular bearing surface is inclined with respect to the striking axis and diverges in the direction of the striking piston. However, according to one variation of the present invention, the annular bearing surface may be perpendicular to the striking axis.

[0042] According to one embodiment of the present invention, a front contact surface is provided in the main body.

[0043] According to another embodiment of the present invention, a rotary impact hydraulic drill includes an annular contact ring disposed on a body, and the annular contact ring is disposed around a shank and includes a front contact surface.

[0044] According to one embodiment of the present invention, the coupling member includes an external peripheral member that is rotatably coupled, for example, directly or indirectly, to the output shaft of a drive motor belonging to a rotary drive device.

[0045] According to one embodiment of the present invention, the coupling member is a coupling pinion.

[0046] According to one embodiment of the present invention, the female coupling splines of the shank are uniformly distributed around the extension axis.

[0047] According to one embodiment of the present invention, the male coupling splines of the coupling member are uniformly distributed around the extended axis of the shank.

[0048] According to one embodiment of the present invention, the shank comprises a first end having an end face that opposes the striking piston and receives the strike of the striking piston, and a second end located opposite the first end and coupled to at least one drilling bar.

[0049] According to one embodiment of the present invention, the coupling portion is formed by the first end of the shank.

[0050] According to one embodiment of the present invention, the extension axis of the shank is parallel to the striking axis and, for example, coincides with the striking axis.

[0051] According to one embodiment of the present invention, a rotary impact hydraulic drill includes a main hydraulic supply circuit configured to control the reciprocating sliding of a striking piston along a striking axis.

[0052] According to an embodiment of the present invention, each of the female and male coupling splines provided on the shank extends to the rear end of the shank. According to one variation of the present invention, the rear end of each of the female and male coupling splines provided on the shank is spaced apart from the rear end of the shank.

[0053] According to an embodiment of the present invention, each of the female and male coupling splines provided on the shank has a useful length of less than 100 mm.

[0054] According to an embodiment of the present invention, the shank has a maximum diameter of 61 mm or less, advantageously less than 46 mm, at the front portion of the annular bearing flange.

[0055] According to an embodiment of the present invention, the bottom surface of each female coupling spline provided in the shank is substantially flat.

[0056] The present invention will be better understood with the help of the following description, with reference to the attached schematic drawing illustrating one embodiment of such a rotary impact hydraulic drill as a non-limiting example. Brief explanation of the drawing

[0057] FIG. 1 is a schematic longitudinal section of a rotary impact hydraulic drill according to a first embodiment of the present invention. FIG. 2 is a side view of a shank belonging to the rotary impact hydraulic drill of FIG. 1. FIG. 3 is a cross-sectional view of the shank of FIG. 2. FIG. 4 is a longitudinal section partial view of the shank of FIG. 2. FIG. 5 is a longitudinal section partial view of a shank of a rotary impact hydraulic drill according to a second embodiment of the present invention. Specific details for implementing the invention

[0058] FIGS. 1 to 4 show a rotary impact hydraulic drill (2) for drilling a blast hole.

[0059] The rotary impact hydraulic drill (2) includes a main body (3) configured to be slidably mounted on a slide.

[0060] The rotary impact hydraulic drill (2) further comprises a striking device (4) including a striking piston (5) mounted to alternately slide in a piston cylinder (6) that is defined by the body (3) and extends along the striking axis (A). The striking piston (5) and the piston cylinder (6) define an annular main control chamber (7) and an auxiliary control chamber (8) that has a larger cross-section than the main control chamber (7) and faces the main control chamber (7).

[0061] The striking device (4) further includes a control valve (9) arranged to control the reciprocating motion of the striking piston (5) within the piston cylinder (6), which alternately follows the striking stroke and the return stroke. This control valve (9) is configured to connect the auxiliary control chamber (8) to a high-pressure fluid supply duct (11), such as a high-pressure incompressible fluid supply duct, during the striking stroke of the striking piston (5), and to connect it to a pressure fluid return duct (12), such as a low-pressure incompressible fluid return duct, during the return stroke of the striking piston (5). High-pressure fluid is advantageously supplied continuously to the main control chamber (7) by means of a supply channel.

[0062] The high-pressure fluid supply duct (11) and the low-pressure fluid return duct (12) belong to the main hydraulic supply circuit to which the striking device (4) is provided. This main hydraulic supply circuit may advantageously include a high-pressure accumulator connected to the high-pressure fluid supply duct (11).

[0063] The rotary impact hydraulic drill (2) also includes a shank (13) that is coupled in a known manner to at least one drilling bar (not shown in the drawing) equipped with a tool. The shank (13) includes a first end (14.1) that extends longitudinally along an extension axis that is advantageously aligned with the impact axis (A), and is provided with an end face (15) that is opposed to the impact piston (5), and during each operating cycle of the rotary impact hydraulic drill (2), the impact piston (5) strikes the end face, and the shank also includes a second end (14.2) that is opposite to the first end (14.1) and is coupled to at least one drilling bar.

[0064] The shank (13) includes, for example, a coupling portion formed by a first end (14.1), and the coupling portion includes, for example, a female coupling spline (16) and a male coupling spline (17) that extend parallel to the extension axis of the shank (13) and are angle-offset from each other with respect to the extension axis of the shank (13). The female and male coupling splines (16, 17) are advantageously evenly distributed around the extension axis of the shank (13). Advantageously, each male coupling spline (17) is positioned between two adjacent female coupling splines (16).

[0065] Each of the female and male coupling splines (16, 17) includes a rear end oriented toward the striking piston (5) and a front end opposite to each rear end. According to the embodiments shown in FIGS. 1 to 4, each of the female and male coupling splines (16, 17) extends to the rear end of the shank (13). However, according to one variation of the invention, the rear end of each of the female and male coupling splines (16, 17) may be spaced apart from the rear end of the shank (13).

[0066] The rotary impact hydraulic drill (2) further includes a rotary drive unit (18) configured to rotate the shank (13) around a rotation axis that substantially coincides with the impact axis (A).

[0067] The rotary drive device (18) includes a coupling member (19), such as a tubular coupling pinion, positioned around the shank (13). The coupling member (19) includes a male coupling spline and a female coupling spline that are rotatably coupled to the female and male coupling splines (16, 17) of the shank (13), respectively. The male coupling spline and the female coupling spline provided on the coupling member (19) are evenly distributed around the extension axis of the shank (13).

[0068] Advantageously, the coupling member (19) includes an outer peripheral tooth that is rotatably coupled to the output shaft of a drive motor (21), such as a hydraulic motor, which is hydraulically supplied by an external hydraulic supply circuit belonging to a rotary drive unit (18). The rotary drive unit (18) may include, for example, an intermediate pinion (22), which is coupled to the output shaft of the drive motor (21) on one side and to the outer peripheral tooth of the coupling member (19) on the other side.

[0069] The rotary impact hydraulic drill (2) further includes a forward contact surface (23) that is annular and extends around the shank (13). The forward contact surface (23) is located on the opposite side of the impact piston (5) with respect to the coupling member (19). The forward contact surface (23) may be provided directly to the main body (3) or to an annular contact ring disposed on the main body (3).

[0070] The shank (13) includes an annular bearing flange (24) provided on the outer surface of the shank (13). The annular bearing flange (24) includes an annular bearing surface (25), which is configured to contact a forward contact surface (23) to limit the forward displacement stroke of the shank (13). Advantageously, the annular bearing surface (25) is inclined with respect to the striking axis (A) and diverges in the direction of the coupling portion of the shank (13).

[0071] According to the embodiments shown in FIGS. 1 to 4, the annular bearing flange (24) further comprises an outer peripheral surface (26) that is generally cylindrical and extends in the direction of the rear end of the shank (13) as an extension of the annular bearing surface (25). The outer peripheral surface (26) advantageously has an outer diameter greater than or equal to the outer diameter of the coupling portion.

[0072] Advantageously, each female and male coupling spline (16, 17) extends from the annular bearing flange (24) toward the rear end of the shank (13). According to the embodiment shown in FIGS. 1 to 4, the front end of each female coupling spline (16) is provided on the annular bearing flange (24) and is open into the outer surface of the annular bearing flange (24) and, for example, the outer periphery surface (26).

[0073] According to the embodiments shown in FIGS. 1 to 4, each female coupling spline (16) comprises a bottom surface (27) that is substantially flat and extends in the extension direction of the female coupling spline, and a connecting surface (28) that connects each bottom surface (27) to an annular bearing flange (24) and extends forward away from the extension axis of the shank (13). According to the embodiments shown in FIGS. 1 to 4, the connecting surface (28) of each female coupling spline (16) is formed by a curved concave surface (28.1) that extends in the extension direction of each female coupling spline (16) and has a radius of curvature (R) smaller than the radial height (Hr) of each male coupling spline (17) provided to the shank (13). The radius of curvature (R) of each curved concave surface (28.1) is advantageously less than 15 mm, for example less than 10 mm.

[0074] Each female coupling spline (16) may have, for example, a rectangular cross-section and thus may have two lateral surfaces that are extended in the longitudinal direction and substantially parallel. However, each female coupling spline (16) may have a generally V-shaped cross-section.

[0075] According to the embodiments shown in FIGS. 1 to 4, for each male coupling spline (17), the radial distance (D) between the extension axis of the shank (13) and the normal surface (29) of the male coupling spline (17) R ) is substantially constant along the male coupling spline.

[0076] When the cutting edge is blocked by the rock, the rotary impact hydraulic drill (2) is retracted until the annular bearing surface (25) of the annular bearing flange (24) contacts the front contact surface (23).

[0077] Then, to unlock the cutting edge, the rotary drive unit (18) is activated to rotate the shank (13). The striking unit (4) can also be activated simultaneously with the rotary drive unit (18) to strike the shank (13) with the striking piston (5).

[0078] Such activation of the rotary drive device (18) and possibly the striking device (4) causes rotational friction of the annular bearing surface (25) of the annular bearing flange (24) against the front contact surface (23) and potential axial impact of the annular bearing surface (25) against the front contact surface (23).

[0079] If an annular bearing flange (24) is present in the front portion of the female and male coupling splines (16, 17) provided on the shank (13), contact between the male coupling spline (17) provided on the shank (13) and the front contact surface (23) can be avoided, and thus the integrity of the latter can be maintained. Additionally, the fact that the annular bearing surface (25) is annular ensures a relatively large contact surface between the front contact surface (23) and the annular bearing flange (24), and thus ensures better dispersion of the impact force applied to the front contact surface (23) by the shank (13).

[0080] Accordingly, a specific configuration of the rotary impact hydraulic drill (2) according to the present invention significantly increases the service life of the shank (13), thereby significantly reducing the time required to replace the shank (13) and the risk of damage to the rotary impact hydraulic drill (2) by wear particles from the shank (13).

[0081] Additionally, when the male coupling spline (17) provided on the shank (13) extends directly from the annular bearing flange (24), the axial length of the shank (13) is not affected by the presence of the annular bearing flange (24), thereby obtaining a compact rotary impact hydraulic drill (2).

[0082] FIG. 5 shows a shank (13) of a rotary impact hydraulic drill (2) according to a second embodiment of the present invention, which is different from the first embodiment shown in FIG. 1 to 4 in that the front end of each female coupling spline (16) is open into the annular bearing surface (25) of the annular bearing flange (24). According to such an embodiment of the present invention, the radial height of the annular bearing flange (24) at the exit of the front end of each female coupling spline (16) is greater than 50% of the maximum radial height of the annular bearing flange (24), for example, 60% or 70% or more.

[0083] Of course, the present invention is not limited to the only embodiment of this rotary impact hydraulic drill described above as an example, but on the contrary, includes all variations thereof.

Claims

Claim 1 A rotary impact hydraulic drill (2), comprising: a main body (3); a shank (13) coupled to at least one drilling bar equipped with a tool—the shank (13) comprises a coupling portion including a female coupling spline (16) and a male coupling spline (17), wherein the female coupling splines (16) are angularly offset from each other with respect to the extension axis of the shank (13) and the male coupling splines (17) are angularly offset from each other with respect to the extension axis of the shank (13)—; a striking piston (5) slidably mounted inside the main body (3) along a striking axis (A) and configured to strike the shank (13); a rotary drive device (18) configured to rotate the shank (13) around a rotation axis that coincides with the striking axis—the rotary drive device (18) is a coupling disposed around the shank (13). It includes a member (19), wherein the coupling member (19) includes a male coupling spline and a female coupling spline that are respectively rotatably coupled to the female and male coupling splines (16, 17) of the shank (13).and includes a front contact surface (23) fixed to the main body (3), wherein the front contact surface (23) is annular and extends around the shank (13), and the shank (13) is configured to contact the front contact surface (23) to limit the forward displacement stroke of the shank (13), the shank (13) includes an annular bearing flange (24) provided on the outer surface of the shank (13), the annular bearing flange includes an annular bearing surface (25) configured to contact the front contact surface (23), and each of the female and male coupling splines (16, 17) provided on the shank (13) extends from the annular bearing flange (24) in the direction of the striking piston (5), and each female coupling spline (16) provided on the shank (13) has a bottom surface (27) and each bottom A rotary impact hydraulic drill comprising a connecting surface (28) connecting a surface (27) to an annular bearing flange (24), wherein the connecting surface extends forward away from the extension axis of the shank (13), and the connecting surface (28) of each female coupling spline (16) provided on the shank (13) is at least partially formed by a curved concave surface (28.1) extending in the extension direction of each female coupling spline, and the curved concave surface has a radius of curvature (R) smaller than the radial height (Hr) of each male coupling spline provided on the shank (13). Claim 2 In claim 1, the rotary impact hydraulic drill (2) has a maximum outer diameter that is greater than or equal to the outer diameter of the coupling portion. Claim 3 In claim 1 or 2, the front end of each female coupling spline (16) provided on the shank (13) is provided on the annular bearing flange (24), a rotary impact hydraulic drill (2). Claim 4 In claim 1 or 2, each male coupling spline (17) provided on the shank (13) comprises a normal surface (29) extending from the annular bearing flange (24), a rotary impact hydraulic drill (2). Claim 5 In claim 1 or 2, the connecting surface (28) of each female coupling spline (16) provided in the shank (13) is formed entirely by each curved concave surface (28.1), a rotary impact hydraulic drill (2). Claim 6 In claim 1 or 2, each of the female and male coupling splines (16, 17) provided on the shank (13) extends to the rear end of the shank (13), forming a rotary impact hydraulic drill (2). Claim 7 A rotary impact hydraulic drill (2) according to claim 1 or 2, wherein the radius of curvature (R) of each curved concave surface (28.1) is less than 15 mm. Claim 8 In claim 1 or 2, the rotary impact hydraulic drill (2) comprises an annular bearing flange (24) having a cylindrical outer peripheral surface (26). Claim 9 In claim 8, the front end of each female coupling spline (16) provided on the shank (13) is open into the outer peripheral surface (26), a rotary impact hydraulic drill (2). Claim 10 A rotary impact hydraulic drill (2) according to claim 1 or 2, wherein the front end of each female coupling spline (16) provided on the shank (13) is open into the annular bearing surface (25) of the annular bearing flange (24). Claim 11 In claim 10, a rotary impact hydraulic drill (2) in which the radial height of the annular bearing flange (24) at the exit of the front end of each female coupling spline (16) provided in the shank (13) is greater than 50% of the maximum radial height of the annular bearing flange (24). Claim 12 A rotary impact hydraulic drill (2), wherein, in claim 1 or 2, the annular bearing surface (25) is inclined with respect to the impact axis and diverges in the direction of the impact piston (5). Claim 13 In claim 1 or 2, the rotary impact hydraulic drill comprises an annular contact ring disposed on the main body (3), the annular contact ring disposed around the shank (13) and comprising a front contact surface (23), a rotary hydraulic impact drill (2).

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