TWI680227B - Motor apparatus for pneumatic tool - Google Patents

Abstract

The invention is a pneumatic tool motor device, which includes a rotor unit rotatably disposed in a cylinder unit, the rotor unit includes a rotor, a top stopper and a plurality of blades, and the rotor has a periphery formed on the rotor. A pair of first blade slots and a through hole communicating with the pair of first blade slots are arranged on the surface and symmetrically, and the top stopper is movably disposed in the through hole and the length of the top stopper is greater than the through hole So that at least one of the plurality of blades movably placed in the first blade slot keeps protruding from the outer diameter of the rotor, and accordingly, after the airflow is introduced into the cylinder unit, the protruding blades can be pushed to drive the rotor to make the rotor Was successfully launched.

Description

Pneumatic tool motor device

The present invention relates to pneumatic tool technology, and more particularly to a pneumatic tool motor device that enables a rotor to be started smoothly.

As the so-called workers want to do their best, they must first sharpen their tools. In order to make users of hand tools more time-saving and labor-saving, therefore, pneumatic tools have been developed to improve the work efficiency compared to traditional hand tools. To promote the development of industry and technology.

The power source of pneumatic tools lies in the driving of the air motor. The conventional air motor includes a cylinder and a rotor with a plurality of blades inserted around the cylinder. The cylinder further has a front cover, a front cover and a rear cover, respectively. The rotor is housed in the cylinder. It can be rotatably arranged between the front cover and the rear cover, so that the blade is driven by the gas pressure introduced by the cylinder to drive the rotor to rotate. However, in the conventional air motor structure, when the motor is stopped, the blade is often submerged in the rotor. In order to allow the blade to be exposed from the rotor smoothly during startup, the front and rear faces of the cylinder are provided with air-guiding blowers. The wind guide groove can blow blades inserted into the rotor out of the rotor when the rotor starts. However, the wind guide groove is provided on two sides adjacent to the blade. Therefore, the blade may be blocked by the wind guide groove. The blades cannot extend, which affects the operation of the rotor. Problems with smooth rotation or poor efficiency.

To solve the above problem, it is proposed that a spring be provided between the blade and the rotor, and the blade is pushed out by the spring. However, in this design, because the spring is not easy to locate, during the rotation of the rotor, the spring will be distorted due to the uneven force of the spring. Or damage caused by friction. When the spring is deformed or damaged, it will cause the blade to be stuck in the rotor and cannot be smoothly extended. With this structure design, there is still a possibility that the rotor cannot rotate smoothly. In addition, the blade is continuously affected by the spring elastic force. Abutting on the inner wall of the cylinder results in greater friction between the blade and the cylinder. This will cause the rotor to require greater wind force, which will affect the startup of the rotor. When the rotor rotates, it will also reduce the rotor's rotational force. And affect the rotor operation.

In view of this, how to find an air motor design without the need to set a wind guide blower and ensure that the blade can smoothly protrude to the outer diameter of the rotor when the rotor starts, thereby improving the working efficiency of the pneumatic machine tool. At present, those skilled in the art are eager to pursue the goal.

An object of the present invention is to provide an air motor in a cylinder without a wind guide groove, so that the blades can keep protruding from the rotor, so as to avoid the blades from being caught in the wind guide groove, so as to ensure that the rotor can start smoothly.

In order to achieve the above object, the present invention provides a pneumatic tool motor device including: a cylinder unit including a cylinder having an accommodation space; and a rotor unit rotatably disposed in the accommodation space of the cylinder. The rotor unit includes a rotor, a top stopper, and a plurality of blades. The rotor has a pair of first blade slots formed on the outer peripheral surface thereof and symmetrically arranged, and a pair of first blade slots. Through one through hole of the pair of first blade slots, each of the plurality of blades is movably disposed in each of the first blade slots, the top stopper is movably disposed in the through hole and the length of the top stopper is greater than The through hole is used to keep at least one of the plurality of blades protruding from the outer diameter of the rotor, wherein when the top stopper abuts the two blades in the pair of first blade slots, the outer side edges of the two blades The distance between them is larger than the outer diameter of the rotor and smaller than the inner diameter of the cylinder.

In an embodiment, the rotor has a plurality of pairs of first blade slots, and the top latch members are a plurality of, and each of the top latch members is movably disposed in each through hole of the plurality of pairs of first blade slots.

In another embodiment, there are a plurality of through-holes in the first blade slot, and a top stopper corresponding to the number of through-holes is movably disposed in each of the through-holes.

In another embodiment, the outer peripheral surface of the rotor further has a plurality of second blade slots, and each of the plurality of blades is movably disposed in each of the second blade slots.

In the above embodiment, each of the first blade slots and each of the second blade slots are respectively disposed along the radial direction of the rotor.

In another embodiment, the top latch is a single latch.

In yet another embodiment, the cylinder unit further includes a front cover having a front shaft hole and a rear cover having a rear shaft hole, and the front cover and the rear cover are respectively disposed on two axial sides of the cylinder. Both ends of the rotor are rotatably provided in the front shaft hole and the rear shaft hole, respectively. In addition, the rear cover has an intake flow passage, and the cylinder has an air passage communicating with the intake flow passage.

As can be seen from the above, compared with the prior art, the present invention It can keep the blades protruding from the outer diameter of the rotor, thereby achieving the effect of ensuring that the rotor can start smoothly, that is, avoiding that the air chamber isolated by the blade is not closed because it does not leave the groove, and thus cannot form. A certain air pressure is used to push the blades. In addition, as the rotor rotates, the blades that are movably installed in the slots will be centrifuged away as close to the inner wall of the cylinder as possible, which can make the rotor run more smoothly.

1‧‧‧Pneumatic tool motor device

10‧‧‧ Cylinder unit

101‧‧‧ Cylinder

102‧‧‧accommodation space

103‧‧‧Airway

12‧‧‧rotor unit

121‧‧‧rotor

122, 122’‧‧‧ Top stop

123‧‧‧ Blade

124, 124’‧‧‧ First blade slot

125, 125’‧‧‧ through holes

126‧‧‧Second Blade Slot

127‧‧‧Rod

13‧‧‧ front cover

131‧‧‧Front shaft hole

14‧‧‧ back cover

141‧‧‧Rear shaft hole

142‧‧‧Inlet runner

2‧‧‧Pneumatic tools

21‧‧‧Operation Department

211‧‧‧operating parts

22‧‧‧Air intake

221‧‧‧Trigger

Fig. 1 is an exploded perspective view of a pneumatic tool motor device according to the present invention; Fig. 2 is a longitudinal sectional view of the air tool motor device according to the present invention when it is applied to a pneumatic tool; Figs. 3A and 3B are air tool motors according to the present invention; The transverse sectional views of the first blade slot of the device in different states; FIG. 4 is an exploded view of the three-dimensional structure of the rotor having a plurality of pairs of first blade slots of the pneumatic tool motor device of the present invention; and FIG. 5 is the pneumatic view of the present invention. A transverse sectional view of the tool motor device having a plurality of pairs of first blade slots; FIG. 6 is a longitudinal sectional view of the pneumatic tool motor device of the present invention provided with a plurality of through-holes in a pair of first blade slots; and FIG. 7 A cross-sectional view of a pneumatic tool motor device having a second blade slot according to the present invention.

The technical content of the present invention will be described below with specific specific embodiments. Those skilled in the art can easily read the content disclosed in this specification. Learn about the advantages and benefits of the present invention. However, the present invention can also be implemented or applied in other specific embodiments.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to match the content disclosed in the specification for the understanding and reading of those skilled in the art, and are not intended to limit the implementation of the present invention. The limited conditions are not technically significant. Any modification of the structure, change of the proportional relationship, or adjustment of the size shall still fall within the scope of this invention without affecting the effects and goals that the invention can produce. The technical content disclosed by the invention can be covered. At the same time, the terms such as "up" and "side" cited in this specification are only for the convenience of description, and are not used to limit the scope of the present invention. Substantially changing the technical content should also be regarded as the scope in which the present invention can be implemented.

Please refer to FIG. 1, which is an exploded perspective view of a three-dimensional structure of a pneumatic tool motor device according to the present invention. As shown in the figure, the present invention discloses a pneumatic tool motor device 1, which is mainly used in a pneumatic tool machine to provide the operating power of the pneumatic tool machine. The pneumatic tool motor device 1 includes a cylinder unit 10 and a rotor unit 12.

The cylinder unit 10 includes a cylinder 101 having an accommodating space 102. In addition to the accommodating space 102 in the middle of the cylinder 101, an air passage 103 is provided in the cylinder 101 for the gas to flow into the accommodating space 102.

The rotor unit 12 is rotatably disposed eccentrically in the accommodation space 102 of the cylinder 101. When the rotor unit 12 rotates, it can provide the power output required by the pneumatic machine tool. In detail, the rotor unit 12 includes a rotor 121, a top stopper 122, and a plurality of blades 123, wherein the rotor 121 has a portion formed on the rotor 121. A pair of first blade slots 124 and a through hole 125 communicating with the pair of first blade slots 124 are symmetrically disposed on the outer peripheral surface, that is, a pair of first blade slots 124 can communicate through the through holes 125, Each of the plurality of blades 123 is movably disposed in each of the first blade slots 124, and the top stopper 122 is movably disposed in the through hole 125, and the length of the top stopper 122 is greater than the total length of the through hole 125. 122 There is any displacement due to the rotation of the rotor 121. The top stopper 122 can abut the blade 123 and move it away from the center of the rotor 121, but the blade 123 will not leave the first blade slot 124, so that at least one of the plurality of blades 123 can remain convex. Because of the outer diameter of the rotor 121, in other words, when the two blades 123 in the corresponding first blade slot 124 abut against the top stopper 122, the distance between the outer edges of the two blades 123 is greater than that of the rotor 121 The diameter is smaller than the inner diameter of the cylinder 101. The advantages of the above design will be further explained in FIG.

In an embodiment, the cylinder unit 10 further includes a front cover 13 having a front shaft hole 131 and a rear cover 14 having a rear shaft hole 141. The front cover 13 and the rear cover 14 are respectively disposed in the axial direction of the cylinder 101. On both sides, the two ends of the rotor 121 are rotatably provided in the front shaft hole 131 and the rear shaft hole 141, respectively. Among them, the rotating rod 127 of the rotor 121 projects through the front shaft hole 131 of the front cover 13, and the rear cover 14 has an inlet. Air passage 142, the air passage 103 of the cylinder 101 communicates with the air inlet passage 142, the air passage 103 may be provided on the inner wall of the cylinder 101, and the air flow is guided in the air passage 103 by the air inlet passage 142 of the rear cover 14 and flows in The accommodating space 102 is used to push the rotor unit 12.

In another embodiment, the number of the air passages 103 may be two. For example, the air passages 103 may be respectively provided in front of and behind the inner wall of the cylinder 101, and the air passages 103 may be provided between the air passages 103. An air hole is used to communicate with each other, so that the airflow can enter the two air passages 103 from the air inlet passage 142 after entering.

The pneumatic tool motor device of the present invention is applied to a pneumatic tool. When the trigger of the pneumatic tool is lightly depressed or the air pressure around the rotor is low, the rotor 121 can start to rotate smoothly due to the normal protrusion of the blade. The air chamber separated by the blade 123 can make the rotor 121 rotate smoothly at a low pressure of 15 psi.

Please refer to FIG. 2, which is a longitudinal sectional view of the pneumatic tool motor device of the present invention when it is applied to a pneumatic tool. As shown in the figure, the cross-sectional structure of the air tool motor device is described first, in which the blade 123 can be conformed with the corresponding first blade slot 124, that is, the shape of the blade 123 is the same as the shape of the first blade slot 124 so that The blade 123 may be completely submerged in the first blade slot 124, and the top stopper 122 is provided in the through hole 125 and fills the through hole 125 as much as possible, thereby blocking the air flow from the first blade slot 124 through the through hole 125 to another A first blade slot 124 '.

In addition, as shown in the figure, when the corresponding two blades 123 and the top stopper 122 abut, the distance between the outer edges of the two blades 123 may be the length W, where the length W is the length of the two blades 123 inserted in each of the first blades. When the slots 124 abut against the top stopper 122 respectively, the minimum distance between the outer edges of the two blades 123 is greater than the outer diameter of the rotor 121 and smaller than the inner diameter of the cylinder 101. In this embodiment, the top stopper 122 does not have telescopic elasticity, so each blade 123 will not be continuously abutted against the inner wall of the cylinder 101 due to the elastic pressing of the top stopper 122. Elastic extrusion and keeping it against the inner wall of the cylinder 101 will cause the blade 123 to be compared with the cylinder 101 during operation Severe friction phenomenon, the friction will form additional resistance and affect the operation of rotor 121. Therefore, when the blade 123 is elastically squeezed, it will increase the difficulty of starting the rotor 121 and reduce the rotor 121 by friction when the rotor 121 rotates. Problems such as rotational force. In addition, under the design of the elastic member in the rotor 121 of the present invention, there is no need to consider the life of the elastic member, and the problem of the elastic member damaging and jamming the blade will not occur. The elastic member will continue to vibrate due to compression during the rotation of the rotor. This makes the rotor and blades vibrate. Furthermore, reducing friction reduces the problem of damage to components, which can increase the service life of pneumatic tool motor devices.

As shown in the figure, the pneumatic tool motor device of the present invention can be applied to a pneumatic tool 2. The pneumatic tool 2 includes an operating portion 21 having an operating member 211 and an air intake portion 22 having a trigger 221. The operating portion 21 is connected to the rotor 121. The rotating rod 127, the air intake portion 22 communicates with the air intake passage 142 of the rear cover 14 (as shown in FIG. 1), and the air intake portion 22 is connected to a device such as an air compressor (not shown) through a conduit. Press the trigger 221 to make the airflow provided by the air compressor enter the pneumatic tool 2. The airflow through the air inlet passage 142 pushes the rotor 121 to rotate, so that the rotating rod 127 of the rotor 121 drives the operating member 211 and the operating member 211 of the operating portion 21. For example, a tool (not shown) such as a sleeve can be installed, and the tool can be driven after the operation member 211 is driven.

Please refer to FIGS. 3A and 3B, which are cross-sectional views of the first blade slot of the pneumatic tool motor device of the present invention in different states. As shown in FIG. 3A and referring to FIG. 2 at the same time, the positions of the first blade slots falling at the upper and lower ends during the rotation are disclosed. When the pair of first blade slots 124 are located at the upper and lower positions in the figure, the upper blades 123 is completely submerged into the first blade slot 124, The top stopper 122 protrudes downward into the lower first blade slot 124. Since the length of the top stopper 122 is longer than the through hole 125, the upper end of the top stopper 122 is vertical when the pair of first blade slots 124 are vertical. The lower end of the blade 123 which is upward and upward is convex downward, so that the blade 123 in the lower first blade slot 24 is pushed out, that is, the lower blade 123 may protrude from the outer diameter of the rotor 121.

As shown in FIG. 3B and referring to FIG. 2 at the same time, the positions of the first blade slots falling at the left and right ends during the rotation are disclosed, and when the pair of first blade slots 124 are located at the left and right positions in the figure, the top stopper 122 The two ends protrude from the through holes 125 and extend into the first blade slots 124 on the left and right sides, so that the blades 123 on the left and right sides can protrude from the outer diameter of the rotor 121 at this time. In this way, through the top stopper 122, at least one of the blades 123 in the first blade slot 124 of the rotor 121 can maintain a state of protruding from the outer diameter of the rotor 121, and thus can be used in the case where the wind guide groove is not known. Next, it is ensured that the blade 123 can continuously protrude from the first blade slot 124, so that the rotor 121 can be smoothly rotated without being caught in the groove during startup.

Please refer to FIGS. 3A and 3B at the same time. Regardless of whether the first blade slot 124 is in the up-down, left-right, or any other position, at least one of the blades 123 of the air tool motor device of the present invention can remain protruding from the rotor 121. Therefore, when the air motor is started by using a pneumatic tool, after the airflow is introduced by the air cylinder 101, the blade 123 protruding from the outer diameter of the rotor 121 can be pushed by the wind pressure, thereby driving the rotor 121 to rotate. When the rotor 121 rotates to change the position of the first blade slot 124, for example, it rotates clockwise from the upper and lower positions in FIG. 3A to the left and right positions in FIG. 3B, and turns in FIG. 3A. The blade 123 under the sub 121 rotates clockwise upwards, and then the blade 123 is squeezed inward by the inner wall of the cylinder 101 and gradually retracts into the first blade slot 124. At the same time, the top latch 122 is pushed to the other first blade slot 124 moves, and relatively, the other first blade slot 124 rotates clockwise downwards, and the aforesaid displacement of the top stopper 122 further abuts the blade 123 in the other first blade slot 124 away from the rotor 121 and gradually protrudes. In this way, the rotor 121 has a force receiving surface due to the protruding blade 123, which will facilitate the initial rotation of the rotor 121.

After the rotor 121 starts to rotate, each blade 123 is more easily thrown away from the center of the rotor 121 by the centrifugal force of the rotor 121, so that the blade 123 is as close to the inner wall of the cylinder 101 as possible, thereby achieving the purpose of keeping the air motor running continuously.

Since the air tool motor device of the present invention can keep the blade 123 protruding from the outer diameter of the rotor 121, the problem that the conventional air motor is not easy to start can be improved, and the air motor of the present invention does not need to be familiar with the wind guide groove. Therefore, the problem that the blade 123 is stuck in the groove or the wind guide groove is not generated, and the airflow introduced by the cylinder 101 can be completely supplied to the rotor 121, and the conventional structure must not be partly divided into the air guide groove, and There are cases where the air flow is dispersed. Therefore, the pneumatic tool motor device of the present invention has a more concentrated air flow effect.

The foregoing embodiment is described by using a pair of first blade slots with a top stopper, so that this case can be used, but the number of first blade slots and top stoppers can be changed according to requirements, such as a pair of first blade slots Multiple pushers are used inside, or multiple pushers are used in multiple pairs of first blade slots.

Please refer to Figures 4 and 5. Figure 4 shows the rotor of the present invention with multiple pairs. An exploded view of the three-dimensional structure of the first blade slot, and FIG. 5 is a transverse sectional view of the air tool motor device of the present invention having a plurality of pairs of first blade slots. As shown in FIGS. 4 and 5, in this embodiment, the rotor 121 may have a plurality of pairs of first blade slots 124. Correspondingly, the top latches 122 are also plural, and each top latch 122 is movably disposed on In the respective through holes 125 of the plurality of pairs of first blade slots 124, it should be noted that the top stoppers 122 are arranged to pass through the axis of the rotor 121, but are staggered with each other. Under this design, more blades 123 are passed through The design will help the rotation of the rotor 121.

Please refer to FIG. 6, which is a longitudinal sectional view of a plurality of through holes in a pair of first blade slots of a pneumatic tool motor device according to the present invention. In this embodiment, a pair of first blade slots 124 may have a plurality of through holes 125, 125 'therein, and the through holes 125, 125' will have a corresponding number of top stoppers 122, 122 '. The detents 122 and 122 ′ are movably disposed in the through holes 125 and 125 ′, respectively, so that when the blades 123 are pushed out by the top detents 122 and 122 ′, the force is more evenly avoided to prevent the blades 123 from being skewed. Distortion may cause the air chambers formed by the blades 123 to be not sufficiently closed, and the airflow may flow around and reduce the pressure and thrust.

Please refer to FIG. 7, which is a cross-sectional view of a pneumatic tool motor device with a second blade slot according to the present invention. In this embodiment, a plurality of second blade slots 126 may be provided on the outer peripheral surface of the rotor 121, and the plurality of blades 123 may be movably disposed in each of the second blade slots 126. Specifically, unlike the first blade slot 124, the corresponding second blade slot 126 does not have a through channel therebetween, and of course, no top stopper is placed. After the rotor 121 rotates, the blade 123 in the second blade slot 126 is rotated by the rotor 121 and the second blade is replaced by the second blade. The blade slot 126 is thrown away from the center of the rotor 121, and then abuts on the inner wall of the cylinder 101. Both the first blade slot 124 and the blade 123 in the second blade slot 126 can be subjected to the thrust of the air current in the cylinder 101. The rotor 121 is continuously rotated. It can be known from the above that the rotor 121 can have at least one pair of first blade slots 124 and at least one second blade slot 126 at the same time, and the number of the first blade slots 124 and the second blade slots 126 can be adjusted according to demand.

In the foregoing embodiments, the first blade slot 124 is provided along the radial direction of the rotor 121, that is, the first blade slot 124 is provided longitudinally in the direction of the center axial direction of the rotor 121. In addition, the second blade slot 124 The slot 126 is also provided along the radial direction of the rotor 121.

In other embodiments, the main purpose of the top stopper 122 is to prevent the blade 123 from getting stuck in the slot, so the blade 123 is pushed out of the slot by the top stopper 122. Therefore, the structural design of the top stopper 122 can only achieve the above purpose. Different designs of the top stopper 122 are proposed below.

In the foregoing embodiments, the top latch 122 is a single latch design. When the blade 123 in the first blade slot 124 pushes the top latch 122, the top blade 122 pushes the blade 123 in the other first blade slot 124 at the corresponding end. And let the blade 123 protrude from the outer diameter of the rotor 121.

In summary, compared with the prior art, the pneumatic tool motor device provided by the present invention can keep the blades in the grooves of the rotor protruding from the outer diameter of the rotor, thereby ensuring that the rotor can be smoothly started and continuously rotated. The blades stay out of the rotor, so there is no need to be familiar with the design of the front and rear covers with wind-guiding slots, so that the blades can be prevented from being caught in the wind-guiding slots and affect the rotation of the rotor. In addition, in the present invention, the blades in the grooves of the rotor Will stay against the inner wall of the cylinder, This can reduce the problem of damage caused by continuous friction between the blade and the cylinder.

The above-mentioned embodiment merely exemplifies the principle and effect of the present invention, and is not intended to limit the present invention. Anyone familiar with this technique can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the rights of the present invention should be listed in the scope of patent application described later.

Claims (9)

A pneumatic tool motor device includes: a cylinder unit including a cylinder having an accommodation space; and a rotor unit rotatably disposed in the accommodation space of the cylinder. The rotor unit includes a rotor, A top stopper and a plurality of blades. The rotor has a pair of first blade slots formed symmetrically on an outer peripheral surface thereof and a through hole communicating with the pair of first blade slots. Each of the plurality of blades is movably disposed in each of the two. In the first blade slot, the top stopper is movably disposed in the through hole and the length of the top stopper is greater than the through hole, thereby keeping at least one of the plurality of blades protruding from the outer diameter of the rotor. Wherein, when the top stopper abuts the two blades in the pair of first blade slots, the distance between the outer edges of the two blades is larger than the outer diameter of the rotor and smaller than the inner diameter of the cylinder. The pneumatic tool motor device according to item 1 of the scope of the patent application, wherein the rotor has a plurality of pairs of first blade slots, the top stoppers are plural, and each of the top stoppers is movably disposed on the plurality of pairs of first slots. The blade slots are respectively inserted in the through holes. The pneumatic tool motor device according to item 1 of the scope of the patent application, wherein the through-holes in the first blade slot are a plurality of, and the top stoppers corresponding to the number of through-holes are respectively movably provided in each of the through-holes. In the hole. The pneumatic tool motor device according to item 1 of the scope of patent application, wherein each of the first blade slots is disposed along a radial direction of the rotor. The pneumatic tool motor device according to item 1 of the patent application scope, wherein the outer peripheral surface of the rotor further has a plurality of second blade slots, and each of the plurality of blades is movably disposed in each of the second blade slots. The pneumatic tool motor device according to item 5 of the patent application scope, wherein each of the second blade slots is disposed along a radial direction of the rotor. The pneumatic tool motor device according to item 1 of the patent application scope, wherein the top stopper is a single latch. The pneumatic tool motor device according to item 1 of the scope of patent application, wherein the cylinder unit further includes a front cover having a front shaft hole and a rear cover having a rear shaft hole, and the front cover and the rear cover are respectively It is provided on two axial sides of the cylinder, and two ends of the rotor are rotatably provided on the front shaft hole and the rear shaft hole, respectively. The pneumatic tool motor device according to item 8 of the patent application scope, wherein the rear cover has an air intake passage, and the cylinder has an air passage communicating with the air intake passage.