Hammer drill with a mode changeover mechanism
A hammer drill/driver with a motor having an output member, a planetary transmission, a clutch assembly and a clutch bypass. The planetary transmission, which includes a ring gear, receives rotary power from the output member and produces a rotary output. The clutch assembly has a clutch profile, which is coupled to the ring gear, and a first pin assembly having a first follower, a first pin member and a first spring that biases the first follower into contact with the clutch profile. The clutch bypass has a bypass profile, which is coupled to the ring gear, and second pin assembly having a second follower, a second pin member, a second spring, which biases the second follower away from the bypass profile, and a third spring, which biases the second follower away from the second pin member. A method for operation of a hammer drill/driver is also provided.
1. A hammer drill/driver comprising:
a motor having an output member;
a planetary transmission receiving rotary power from the output member and producing a rotary output, the planetary transmission including a ring gear;
a clutch assembly having a clutch profile, which is coupled to the ring gear, and a first pin assembly having a first follower, a first pin member and a first spring that biases the first follower into contact with the clutch profile; and
a clutch bypass having a bypass profile, which is coupled to the ring gear, and second pin assembly having a second follower, a second pin member, a second spring, which biases the second follower away from the bypass profile, and a third spring, which biases the second follower away from the second pin member.
2. The hammer drill/driver of claim 1 , wherein the planetary transmission is a multi-stage transmission that provides at least three distinct speed ratios.
3. The hammer drill/driver of claim 2 , wherein the ring gear is associated with a stage of the transmission that is closest to the motor.
4. The hammer drill/driver of claim 1 , wherein the planetary transmission includes a transmission sleeve into which the ring gear is disposed.
5. The hammer drill/driver of claim 4 , wherein the transmission sleeve includes a first longitudinally extending bore into which at least one of the first pin assembly and the second pin assembly is disposed.
6. The hammer drill/driver of claim 5 , wherein the first pin assembly is disposed in the first longitudinally extending bore and wherein the transmission sleeve includes a second longitudinally extending bore into which the second pin assembly is disposed.
7. The hammer drill/driver of claim 1 , wherein the clutch profile is disposed radially inwardly of the bypass profile.
8. The hammer drill/driver of claim 1 , further comprising a mode setting switch and a torque selling switch and wherein the clutch bypass includes a third pin assembly having a third follower, a third pin member, a fourth spring, which biases the third follower away from the bypass profile, and a fifth spring, which biases the third follower away from the third pin member, the mode setting switch being operable for selling the hammer drill/driver into a first mode, wherein a rotary output is provided to an output spindle, and a second mode, wherein a rotary and percussive output is provided to the output spindle, the torque setting switch being operable for adjusting a force exerted by the first pin assembly onto the clutch profile, and wherein the second follower is moved into contact with the bypass profile when the hammer drill/driver is operated in the second mode.
9. The hammer drill/driver of claim 8 , wherein the third follower is moved into contact with the bypass profile when the torque setting switch is set to a predetermined torque setting.
10. The hammer drill/driver of claim 9 , wherein the predetermined torque setting is a maximum torque setting.
11. The hammer drill/driver of claim 9 , wherein the predetermined torque setting is a minimum torque setting.
12. The hammer/drill driver of claim 8 , wherein the mode setting switch is a rotary switch.
13. The hammer drill/driver of claim 8 , wherein the torque setting switch is a rotary switch.
14. The hammer drill/driver of claim 1 , wherein the hammer drill/driver is operable in a screwdriver mode, wherein a rotary output is provided to an output spindle and the second follower is spaced apart from the bypass profile, a drill mode, wherein a rotary output is provided to the output spindle and the second follower is engaged to the bypass profile to inhibit rotation of the ring gear, and a hammer drill mode, wherein a rotary and percussive output is provided to the output spindle and the second follower is engaged to the bypass profile to inhibit rotation of the ring gear.
15. A drill/driver comprising:
a motor having an output member;
a planetary transmission receiving rotary power from the output member and producing a rotary output, the planetary transmission including a ring gear;
a clutch assembly having a clutch profile, which is coupled to the ring gear, and a first pin assembly having a first follower, a first pin member and a first spring that biases the first follower into contact with the clutch profile; and
a clutch bypass having a bypass profile, which is coupled to the ring gear, and second pin assembly having a second follower, a second pin member, a second spring, which biases the second follower away from the bypass profile, and a third spring, which biases the second follower away from the second pin member;
wherein the planetary transmission includes a transmission sleeve into which the ring gear is disposed, wherein the transmission sleeve includes a first longitudinally extending bore into which at least one of the first pin assembly and the second pin assembly is disposed, and wherein the drill/driver is operable in a screwdriver mode, wherein a rotary output is provided to an output spindle and the second follower is spaced apart from the bypass profile, and a drill mode, wherein a rotary output is provided to the output spindle and the second follower is engaged to the bypass profile to inhibit rotation of the ring gear.
16. The drill/driver of claim 15 , wherein the first pin assembly is disposed in the first longitudinally extending bore and wherein the transmission sleeve includes a second longitudinally extending bore into which the second pin assembly is disposed.
17. The drill/driver of claim 16 , wherein the clutch profile is disposed radially inwardly of the bypass profile.
18. The drill/driver of claim 15 , further comprising a mode setting switch and a torque setting switch, wherein the clutch bypass includes a third pin assembly having a third follower, a third pin member, a fourth spring, which biases the third follower away from the bypass profile, and a fifth spring, which biases the third follower away from the third pin member, the mode setting switch being operable for setting the drill/driver into a first mode, wherein a rotary output is provided to an output spindle, and a second mode, wherein a rotary and percussive output is provided to the output spindle, the torque setting switch being operable for adjusting a force exerted by the first pin assembly onto the clutch profile, and wherein the second follower is moved into contact with the bypass profile when the drill/driver is operated in the second mode.
19. The drill/driver of claim 18 , wherein the third follower is moved into contact with the bypass profile when the torque setting switch is set to a predetermined torque setting.
20. The drill/driver of claim 18 , wherein the mode setting switch is a rotary switch.
21. The drill/driver of claim 15 , wherein the drill/driver is further operable in a hammer drill mode, wherein a rotary and percussive output is provided to the output spindle and the second follower is engaged to the bypass profile to inhibit rotation of the ring gear.