Electric tool shell and electric hammer

Abstract

The utility model discloses an electric tool shell which is characterized in that the electric tool shell comprises two outer shells which are oppositely arranged, a separating piece and a sealing ring, and an installation space is formed between the outer shells; the separator is fixed in the mounting space and divides the mounting space into a first space and a second space, the first space is used for fixing a transmission mechanism of the electric tool, the second space is used for fixing a motor, a winding flow channel is formed between the separator and the inner wall of the shell, and the first space is used for fixing the transmission mechanism of the electric tool. Lubricating grease carried by the transmission mechanism and generated air flow are blocked for multiple times when flowing towards the second space, and the flow direction is changed; and the sealing ring is at least partially extruded between the separator and the shell. According to the electric tool shell, due to the fact that the zigzag flow channel is arranged, turbulent flow is generated when airflow generated by the transmission mechanism moves downwards, kinetic energy is consumed when lubricating grease is driven by the airflow to flow downwards, and therefore the probability of oil leakage is reduced, and the stability of long-time use is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power tools, and particularly relates to an improved power tool housing and a hammer drill adopting the power tool housing. Background Art

[0002] As a commonly used tool in people's daily work, a power tool usually has a transmission mechanism disposed inside a housing to connect a power mechanism and an operating mechanism. To provide lubrication to reduce friction and lower the temperature rise, grease is usually added to the transmission mechanism. However, when the transmission mechanism is working, air flow is generated, and the grease will flow under the action of the air flow. If the housing is not sealed properly, oil leakage may occur after long-term use.

[0003] The information disclosed in this background art section is only for enhancing the overall understanding of the utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an improved power tool housing to solve the problem of oil leakage.

[0005] To achieve the above purpose, a specific embodiment of the utility model provides a power tool housing, which is characterized in that it includes two relatively arranged outer shells, a partition member and a sealing ring. An installation space is formed between the outer shells; the partition member is fixed in the installation space and divides the installation space into a first space and a second space. The first space is configured to accommodate a power tool transmission mechanism, and the second space is configured to accommodate a motor. A meandering flow channel is formed between the partition member and the inner wall of the outer shell; at least part of the sealing ring is squeezed between the partition member and the outer shell.

[0006] In one or more embodiments of the utility model, a ring-shaped groove is provided on the inner wall of the outer shell near the partition member in the first space. The partition member includes a substrate and an annular protrusion protruding outward from the side wall of the substrate and capable of being inserted into the groove. The flow channel includes a first gap between the protrusion and the groove.

[0007] In one or more embodiments of the utility model, a stop portion is provided on the inner wall of the outer shell. The stop portion is located above the groove and protrudes toward the inside of the installation space. The flow channel includes a second gap between the stop portion and the outer peripheral wall of the partition member.

[0008] In one or more embodiments of the utility model, the width of the first gap in the flow direction of the flow channel is greater than the width of the second gap in the flow direction of the flow channel.

[0009] In one or more embodiments of the present utility model, a first receiving groove for receiving the sealing ring is provided on the separating member.

[0010] In one or more embodiments of the present utility model, a positioning hole is formed at the bottom of the first receiving groove, and a positioning post protruding from the sealing ring is inserted into the positioning hole.

[0011] In one or more embodiments of the present utility model, at least one of the two outer shells is provided with a second receiving groove for receiving the sealing ring.

[0012] The present utility model also provides a hammer drill, which includes the electric tool housing, the front cylinder, the motor, the transmission assembly and the striking assembly as described above. The front cylinder is fixed to the outer shell and communicates with the first space; the motor is installed in the second space; the transmission assembly is installed in the first space and is connected to the motor; the striking assembly is installed in the front cylinder and the first space and is connected to the transmission assembly.

[0013] In one or more embodiments of the present utility model, the transmission assembly includes a gearbox and a crankshaft connected to the gearbox. A support rib for supporting the gearbox is provided on the inner wall of the outer shell, and the striking assembly is connected to the crankshaft.

[0014] In one or more embodiments of the present utility model, a partition is provided on the inner wall of the outer shell. The crankshaft is arranged between the partition and the support rib, and at least two through holes are formed in the partition.

[0015] Compared with the prior art, the electric tool housing of the present utility model is provided with a tortuous flow channel, so that the air flow generated by the upper transmission mechanism generates turbulence when moving downward, and the kinetic energy of the grease is consumed when it flows downward under the drive of the air flow. Therefore, the probability of oil leakage is reduced and the stability during long-term use is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is an exploded view of the electric tool housing in an embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of the outer shell in an embodiment of the present utility model;

[0019] Figure 3 Schematic diagram of a partition member in an embodiment of the present utility model;

[0020] Figure 4 Schematic diagram of a sealing ring in an embodiment of the present utility model;

[0021] Figure 5 Cross-sectional view of a hammer drill in an embodiment of the present utility model;

[0022] Figure 6 is Figure 5 An enlarged view of a partial area A in

[0023] Main reference numeral description:

[0024] 100 - Electric tool housing, 10 - Outer shell, 11 - First space, 12 - Second space, 13 - Stopping portion, 14 - Groove, 151 - First gap, 152 - Second gap, 16 - Support rib, 17 - Partition board, 18 - Through hole, 19 - Heat dissipation hole, 20 - Sealing ring, 21 - Positioning post, 30 - Partition member, 31 - First receiving groove, 32 - Positioning hole, 33 - Protruding portion, 40 - Motor, 50 - Transmission assembly, 51 - Gearbox, 52 - Crankshaft, 60 - Striking assembly, 70 - Front cylinder, 200 - Hammer drill. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0026] As Figures 1-4 and Figure 6 shown, the electric tool housing 100 in an embodiment of the present utility model includes two relatively arranged outer shells 10, as well as a partition member 30 and a sealing ring 20. After the two outer shells 10 are combined together, an installation space will be formed between them. The partition member 30 is fixed in the installation space and divides the installation space into a vertically arranged first space 11 and a second space 12, where the first space 11 is used to fix the transmission mechanism of the tool, and the second space 12 is used to fix the motor. A tortuous flow channel is formed between the partition member 30 and the inner wall of the outer shell 10. The sealing ring 20 is pressed at the connection of the two outer shells 10, and a part of it is arranged between the flow channel and the second space 12.

[0027] Since lubricating grease generally needs to be added to the transmission mechanism, a sealing ring 20 is configured to improve airtightness and prevent oil leakage. However, since air flow is generated when the transmission mechanism is working, the air flow can provide power for the flow of the lubricating grease, and oil leakage may still occur after long-term operation. Since the air flow is the greatest at the position where the transmission mechanism is connected to the motor, in this embodiment, a meandering flow channel is reserved between the partition member 30 and the inner wall of the housing 10, which can increase the flow path of the air flow and the lubricating grease. When flowing on different surfaces of the flow channel, the air flow and the lubricating grease carried by the transmission mechanism are blocked by the flow channel many times and change the flow direction, and the kinetic energy is greatly reduced, and the air flow is greatly weakened. Therefore, when the air flow generated by the operation of the transmission mechanism flows in the direction of the second space 12, the pushing effect on the lubricating grease is greatly reduced. The lubricating grease also needs to pass through the above flow channel to move towards the second space 12, so the probability of oil leakage is greatly reduced, and the stability during long-term use is improved.

[0028] As Figure 2 shown, a ring-shaped groove 14 is provided on the housing 10, and the partition member 30 includes a substrate 34 and an annular protrusion 33 protruding outward from the side wall of the substrate 34. When assembling the housing 10 and the partition member 30, the protrusion 33 is inserted into the groove 14, and the protrusion 33 and the groove 14 do not completely abut against each other, and a first gap 151 is formed therebetween. The above flow channel includes the first gap 151.

[0029] As Figure 6 shown (the arrows indicate the flow direction of the air flow and the lubricating grease), when the air flow and the lubricating grease generated by the transmission mechanism flow in the direction of the lower second space 12, the air flow and the lubricating grease flow downward along the gap between the side wall of the partition member 30 and the upper end surface of the groove 14, and then are blocked by the upper end surface of the protrusion 33, and the flow direction of the air flow and the lubricating grease changes, and flows in the direction parallel to the upper end surface of the protrusion 33 towards the bottom wall of the groove 14. The flow direction changes at the corner of the upper end surface of the protrusion 33 and passes downward through the gap between the side wall of the protrusion 33 and the bottom wall of the groove 14, and then is blocked by the lower side wall of the groove 14 and the flow direction changes again, and flows along the side wall of the groove 14 in the direction away from the bottom wall of the groove 14, and then is blocked by the side wall of the partition member 30, and finally flows along the side wall of the partition member 30 towards the sealing ring 20. Therefore, when the air flow and the lubricating grease flow towards the second space 12, they are blocked and the flow direction changes many times, and the kinetic energy of the air flow and the lubricating grease is consumed during the process. Therefore, the lubricating grease loses the tendency to continue flowing before flowing to the sealing ring 20, and the oil leakage situation is greatly reduced.

[0030] This embodiment shows the situation of providing a groove 14 in the first space 11 and providing a protrusion 33 on the partition member 30. When the space allows and does not affect the fixation of the internal transmission structure, the number of grooves 14 and protrusions 33 can be increased, and this embodiment does not limit.

[0031] As Figure 2 shown, a stop portion 13 is further provided on the inner wall of the outer shell 10, and its protruding portion is located above the groove 14 and protrudes into the installation space. A second gap 152 is formed between the stop portion 13 and the outer peripheral wall of the partition member 30, and the second gap 152 and the first gap 151 together constitute the above-mentioned flow channel. Still referring to Figure 6 shown, when the transmission mechanism generates a downward airflow, the airflow and lubricant above the stop portion 13 are first blocked by the stop portion 13, then flow towards the second gap 152, and finally enter the first gap 151.

[0032] Preferably, the width of the first gap 151 in the flow direction of the flow channel is greater than the width of the second gap 152 in the flow direction of the flow channel, and the entire flow channel has a structure that is narrow first and then wide along the flow direction. The grease and airflow in the first space 11 are restricted when passing through the second gap 152, and the wider first gap 151 can buffer the grease and gas flowing from the second gap 152, playing a role in adjusting and restoring the air pressure.

[0033] To prevent the seal ring 20 from shifting, as Figure 3 shown, an annular first receiving groove 31 is further provided on the substrate 34 for receiving the part of the seal ring 20 that winds around the partition member 30.

[0034] Furthermore, a positioning hole 32 is opened at the bottom of the first receiving groove 30, and correspondingly, a positioning post 21 protruding from the seal ring 20 can be inserted into the positioning hole 32, which is used to further prevent the seal ring 20 from shifting and play a positioning role. When the positioning post 21 is inserted into the corresponding positioning hole 32, the remaining part of the seal ring 20 can just adhere to the edge position of the outer shell 10 after the partition member 30 is placed on the outer shell 10 without adjustment. Therefore, the operation steps are reduced and the assembly efficiency is improved.

[0035] It is already contemplated that at least one of the two outer shells 10 is also provided with a second receiving groove (not shown in the figure) for receiving the seal ring 20 to prevent the seal ring 20 from shifting. During assembly, first wind the seal ring 20 into the first receiving groove 31, place the partition member 30 on the outer shell 10 provided with the second receiving groove, embed the remaining part of the seal ring 20 into the second receiving groove, and finally combine the two outer shells 10 to complete the assembly.

[0036] In one embodiment, to improve the heat dissipation effect, a plurality of heat dissipation holes 19 are opened on the outer shell 10, and the heat dissipation holes 19 are only opened on the part of the outer shell 10 corresponding to the second space 12, while no heat dissipation holes 19 are opened on the part of the outer shell 10 corresponding to the first space 11 to prevent the grease in the first space 11 from flowing out through the heat dissipation holes 19.

[0037] The present utility model further provides a hammer drill 200, which includes the above-mentioned electric tool housing 100, as well as a front cylinder 70, a motor 40, a transmission assembly 50 and a striking assembly 60. The front cylinder 70 is fixed to the housing 10 and communicates with the first space 11. The motor 40 is installed in the second space 12, the striking assembly 60 is installed in the front cylinder 70 and the first space 11, and the transmission assembly 50 is installed in the first space 11 and is respectively connected to the motor 40 and the striking assembly 60.

[0038] Specifically, the motor 40 and the transmission assembly 50 are fixed to both ends of the partition 30 and then installed on the housing 10. The transmission assembly 50 mainly includes a gearbox 51 and a crankshaft 52, both of which are respectively fixed to the partition 30. The gearbox 51 is connected to and drives the striking assembly 60 through the crankshaft 52 to perform a striking operation. A support rib 16 for supporting the gearbox 51 is provided on the inner wall of the housing 10. During assembly, grease is applied to the transmission assembly 50, and mainly applied to the upper half of the gearbox 51 and near the crankshaft 52. Therefore, the support rib 16 also plays a role in space stratification, and can prevent the grease from flowing towards the motor 40 to a certain extent.

[0039] Furthermore, a partition 17 is also provided on the inner wall of the housing 10. The partition 17 is arranged above the crankshaft 52. The crankshaft 52 is arranged between the partition 17 and the support rib 16, and at least two through holes 18 are formed in the partition 17 ( Figure 2 only the semi-circular hole on one of the housings 10 is shown in the figure. When the two housings 10 are combined, the two semi-circular holes form a complete through hole 18). The partition 17 and the through holes 18 can enable the air flow generated above the support rib 16 by the gearbox 51 to circulate, and also facilitate the flow of grease above the support rib 16.

[0040] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power tool housing, characterized in that: include: Two housings (10) arranged opposite to each other, with an installation space formed between the housings (10); A partition (30) is fixed in the installation space and divides the installation space into a first space (11) and a second space (12), wherein the first space (11) is configured to accommodate a power tool transmission mechanism, and the second space (12) is configured to accommodate a motor, and a meandering flow channel is formed between the partition (30) and the inner wall of the housing (10); The sealing ring (20) is at least partially squeezed between the partition (30) and the housing (10).

2. The power tool housing according to claim 1, characterized in that: The housing (10) is provided with an annular groove (14) on the inner wall near the partition (30) in the first space (11); the partition (30) comprises a base plate (34) and an annular protrusion (33) protruding outward from the side wall of the base plate (34) and capable of being inserted into the groove (14); the flow channel comprises a first gap (151) between the protrusion (33) and the groove (14).

3. The power tool housing according to claim 2, characterized in that: A stopper (13) is provided on the inner wall of the housing (10), the stopper (13) is located above the groove (14) and protrudes toward the interior of the installation space, and the flow channel includes a second gap (152) between the stopper (13) and the outer peripheral wall of the partition (30).

4. The power tool housing according to claim 3, characterized in that: The width of the first gap (151) in the flow direction of the flow channel is greater than the width of the second gap (152) in the flow direction of the flow channel.

5. The power tool housing according to claim 2, characterized in that: The separator (30) is provided with a first accommodating groove (31) for accommodating the sealing ring (20).

6. The power tool housing according to claim 5, characterized in that: A positioning hole (32) is provided at the bottom of the first receiving groove (31), and a positioning column (21) protrudes from the sealing ring (20) and is inserted into the positioning hole (32).

7. The power tool housing according to claim 1, characterized in that: At least one of the two housings (10) is provided with a second accommodating groove for accommodating the sealing ring (20).

8. An electric hammer, characterized in that: include: The power tool housing according to any one of claims 1 to 7; A front cylinder (70) is fixed to the housing (10) and communicates with the first space (11); A motor (40) is installed in the second space (12); A transmission assembly (50) is installed in the first space (11) and connected to the motor (40); The striking assembly (60) is installed in the front tube (70) and the first space (11), and is connected to the transmission assembly (50).

9. The electric hammer according to claim 8, characterized in that: The transmission assembly (50) comprises a gear box (51) and a crankshaft (52) connected to the gear box (51); a support rib (16) for supporting the gear box (51) is provided on the inner wall of the housing (10); and the striking assembly (60) is connected to the crankshaft (52).

10. The electric hammer according to claim 9, characterized in that: A partition (17) is provided on the inner wall of the outer shell (10), the crankshaft (52) is arranged between the partition (17) and the supporting rib (16), and at least two through holes (18) are opened on the partition (17).

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