JP2924976B2 - Perforation or impact hammer - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a boring or percussion hammer provided with a motion conversion transmission, in particular a percussion tool driven through a swash plate transmission and reciprocating. The swash plate boss has a swash plate boss on which the motion conversion transmission is rotationally driven.
A ball rolling groove for a rolling bearing is provided perpendicular to the axis of the swash plate boss, and the outer race of the rolling bearing is fixed to the holding casing in the radial direction and in one direction in the axial direction. Regarding the format.

2. Description of the Related Art In a known perforated or percussive hammer configuration, a fixed bearing for a swashplate transmission is inserted into a casing. This solution is, however, cumbersome. Patent application P.3819125
According to, the bearing is held by a retaining ring,
This leads to an accumulation of manufacturing errors in mass production, which results in play in the swash plate boss bearings.

The object of the invention is therefore to eliminate the above-mentioned disadvantages of the known drilling or hitting hammers.

SUMMARY OF THE INVENTION In order to solve this problem, according to an embodiment of the invention, in a piercing or impact hammer of the type mentioned at the outset, the rolling bearing is axially moved towards the holding casing by means of an elastic holding plate. When pressed, the retaining plate contacts on the one hand the outer race of the rolling bearing and, on the other hand, contacts the retaining casing at at least two support points located on opposite sides of the retaining plate.

According to the invention, the piercing or hitting hammer constructed according to the invention has the advantage that, unlike the known ones, the swash plate transmission can be supported without play. And such a bearing type requires a small space, is easy to assemble, and is insensitive to errors. It is also advantageous if the holding plate is made of spring steel and is fastened to the projection of the holding casing. The spigot can be cast at low cost into one piece of the holding casing, which is necessary anyway for holding the hammering tool.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

The perforating hammer 10 has a motor 11 with a fan wheel 12 in a motor casing 13, which has an outer casing 14 in which a striking tool 15 is housed.
And are screwed. A tool receiving portion 16 is connected to the impact tool 15, and a tool 17 can be inserted into the tool receiving portion.

The impact tool is a swash plate transmission 19 as a motion conversion transmission.
The swash plate transmission is driven by an intermediate shaft 20 connected to the motor 11. A swash plate boss 21 is disposed on the intermediate shaft. The swash plate boss has a ball rolling groove 23 that is positioned obliquely with respect to the axis 22 and a ball rolling groove that is positioned perpendicular to the axis 22. 24 and has. Ball rolling groove 23,
It belongs to a bearing for an oscillating finger 25, shown in dashed lines, which drives a hollow piston 26 with a striking body 27 guided inside. The ball rolling groove 24 serves to support the swash plate boss 21 in the holding casing 31 and belongs to a rolling bearing 28 provided with an outer race 29.

The holding casing 31 further has a turning part 32 in which the outer race 29 is held in a sliding seat in the radial direction and toward the motor 11. Holding casing
31 further receives the motor-side end of the intermediate shaft 20 in its lower area. Holding casing in upper area of swash plate boss 21
31 has a tubular tube 33 protruding towards the striking tool 15, and this tube segment is provided with a slot 34 for passing the swing finger 25. A rotatably driven drive tube 36 for a rotary drive of the tool receiving part 16 is supported on the tube piece 33 via a needle bearing 35. Drive tube 36
The hollow piston 26 is also guided therein.

The pipe piece 33 has a side cutout 3 on the rolling bearing 28 on both sides.
U-shaped holding plate 40 with legs 41, 42 and a web portion 43 connecting the legs.
Can be introduced. The holding plate 40 is resilient and is preferably made of spring steel. Retaining plate legs 41, 42
In the assembled state, extends downward to the height of the shaft 22 of the swash plate boss 21. The ends of the legs 41 and 42 are in contact with the contact surface 44 of the outer race 29 of the rolling bearing (see FIG. 2). In the inserted state of the holding plate 40, a gap 45 remains between the web part 43 and the pipe piece 33, this gap being formed in the pipe piece 33, for example in the form of a turned part. The web portion 43 and the side opposite to the legs 41, 42 are advantageously chamfered flat, so that the legs are substantially flush with the holding casing 31.
Up to the height of the assembly projection 46 which is integrally cast. The protrusion 46 may be formed in the holding casing 31 as a concave portion or a protruding edge. From the pipe piece 33, tensioning projections 47, 48 protrude on both sides at the height of the gap 45, and both tensioning projections are axially viewed from the direction of the impact tool, and the rolling bearings 28 It projects beyond the plane of the contact surface 44.
The tensioning lugs may also extend upwardly in the direction of the assembly lugs 46. The tensioner is integrally cast into the holding casing 31 and the holding plate 40 is provided at two support points 49, 50 near the web at the rolling bearing 28 at the tensioner.
Is in contact with the side facing In the lower area of the pipe piece 33, near the slit 34, two casing projections 51, 52 which are cast integrally project laterally. These spikes 51,
52 has an axial spacing from the contact surface 44 which corresponds approximately to the material thickness of the holding plate 40, so that the holding plate can be introduced between the rolling bearing 28 and the casing projections 51, 52. . The side of the projections 51, 52 facing the rolling bearing 28 is chamfered at an angle, so that the holding plate 40 is located almost at the contact point located at the center of the leg,
The lower ends 55 and 56 of the projections 51 and 52 are in contact with each other. Further, the protrusion may be formed in a block shape. In the embodiment, the projection is made thick for reasons of casting technology.

The attachment of the holding plate 40 can be easily performed using, for example, a driver. The insertion of the holding casing 31 into the outer casing 14 causes the holding plate 40 to have the notches 37, 3
Beyond 8, the casing projections 51, 52 are pushed between the bearing projections 28 until the web portion 43 contacts the tensioning projections 47, 48. The web portion 43 is then moved toward the impact tool away from the holding casing 31 with the help of a driver, in which case the holding plate flexes and is positioned in front of the tensioning projections 47,48. The driver is then applied from the front to the assembly projection 46 and pressed against the flat chamfered surface of the web portion 43. In this way, the holding plate 40 is pushed down toward the rolling bearing to the illustrated end position. This allows the rolling bearing 28
The outer race 29 is pressed without play against the turning part 32 in the holding casing and is fixed in any direction. The holding plate is held in its clamped position in a self-locking manner. After mounting on the outer casing 14, the retaining plate is additionally prevented from being displaced upwards from this outer casing. This is because in this case the web part 43 is in contact with the outer casing 14 (see FIG. 2).

For disassembly, simply insert a screwdriver or the like into the gap 43 and lift the holding plate 40 upward.

The invention is not limited to a U-shaped holding plate. In other words, instead of such a holding plate, for example, two rod-shaped holding plates may be in contact with the left and right sides of the rolling bearing 28, and each may be fixed to the casing.

[Brief description of the drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a perforated hammer, and FIG. 2 is a sectional view taken along line II-II of FIG. 21 ... swash plate boss, 25 ... swinging finger, 28 ... rolling bearing, 29 ... outer race, 31 ... holding casing, 33 ...
Pipe piece, 34 ... slot, 35 ... bearing, 36 ... drive tube, 3
7,38 …… Notch, 40 …… Retention plate, 41,42 …… Leg, 4
4 ... Support surface, 46 ... Assembly projection

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B25D 16/00 B23B 45/16

Claims (8)

(57) [Claims] 1. A piercing or hammer having a swash plate boss which is driven through a motion conversion transmission device and reciprocates and has a swash plate boss which is rotationally driven. The swash plate boss is provided with a ball rolling groove for a rolling bearing arranged perpendicular to the axis of the swash plate boss, and the outer race of the rolling bearing has a radial direction and an axial direction in one side. The rolling bearing (28) is pressed in the axial direction toward the holding casing (31) by an elastic holding plate (40), and is fixed to the holding casing (31). ) On the one hand contacts the outer race (29) of the rolling bearing (28) and, on the other hand, the retaining plate (40)
Perforating or hitting hammer, characterized in that it contacts the holding casing (31) at at least two support points (49, 50; 53, 54) located on opposite sides of the hammer. 2. The bearing (49, 50), which is located away from the rolling bearing (28), is located on the same side of the holding plate (40) as the rolling bearing (28). 2. The perforation or percussion hammer according to claim 1, wherein the support point (53, 54) located near the (28) is located on the other side of the holding plate (40). 3. The support portion (49, 50; 53, 54) is in contact with a projection (47, 48; 51, 52) provided on the holding casing (31), and the projection is rolled. The bearing (28) is offset with respect to the plane of the support surface (44) and is deflected with the mounting plate (40) mounted and pressed against the rolling bearing (28). 2. The perforated or hitting hammer according to 2. 4. A holding plate (40) is U-shaped and has two legs (41, 42), each of which contacts a rolling bearing (28) and a holding casing (31). 4. A perforation or percussion hammer according to any one of the preceding claims, wherein 5. The two legs (41, 42) of the holding plate (40) surround a tubular piece (33) of the holding casing (31) for receiving a part of the striking tool (15). Claim 4
A perforated or hitting hammer as described. 6. The perforation or percussion hammer according to claim 5, wherein the tube piece (33) has a notch (37, 38) on the side for pushing the holding plate (40). 7. A swash plate boss (21) is provided with a ball rolling groove (23) positioned obliquely to an axis of the swash plate boss,
An oscillating finger (25) is connected to the swash plate boss (21) through the ball rolling groove, and a pipe piece (33) is connected to the swash plate boss (21) to penetrate the oscillating finger. Drilling or hitting hammer according to claim 5, characterized in that it has a slit (34) oriented towards the hole. 8. The drilling or percussion hammer has a hollow drive tube (36) serving as a drive spindle, and a tube piece (33) of a holding casing (31) is provided for the rotating drive tube (36). Drilling or hitting hammer according to claim 5, which receives a bearing (35).