Work equipment

Abstract

To provide a work machine that stops a driving source when there is a difference in rotation speed between a rotating driven shaft and a work rotating shaft due to power transmission from the driving source based on comparison of acquired signals.SOLUTION: A work machine is provided with a drive rotation speed detection part that detects signals indicating rotation of a driving source, a work rotation speed detection part that detects signals indicating rotation of a work rotation shaft, a driven shaft that is rotated by power transmission from the driving source based on comparison of signals acquired from the drive rotation speed detection part and the work rotation speed detection part and a control part that stops the driving source when there is a difference in the number of revolutions with the work rotation shaft. The work rotation speed detection part has a member to be detected that rotates together with the work rotation shaft, and a sensor mounting member that holds a detection sensor that detects rotation of the member to be detected. The sensor mounting member is connected to the body frame of the work machine.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a working machine having a working unit including an auger. [Background technology]

[0002] Patent Document 1 discloses a snow removal machine that transmits power from a drive source to an auger to rotate the auger and remove snow. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-156424 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration of Patent Document 1, during snow removal work, the auger may catch ice blocks or stones, preventing the auger from rotating, causing an overload on the power transmission path from the engine to the auger. Such an overload can cause wear on consumables, requiring replacement of parts at short intervals, or cause wear on friction members that transmit rotational torque, leading to the friction members slipping at low torque. It is desirable to detect an overload state and stop the engine when the auger is in an overload state.

[0005] In view of the above problems, the present invention provides a work machine that stops a drive source when a difference in rotation speed occurs between a driven shaft that is rotating due to power transmission from the drive source and a work rotating shaft, based on a comparison of signals obtained from a drive rotation speed detection means and a work rotation speed detection means. [Means for solving the problem]

[0006] A working machine according to one aspect of the present invention includes a drive source and A transmission means for transmitting the rotation of the driving source; a driven rotation means for rotating a driven shaft in response to the rotation transmitted by the transmission means; a connecting means for connecting a work rotating shaft connected to a working unit and the driven shaft via a friction member and transmitting rotation of the driven shaft to the work rotating shaft; A working machine having: a drive rotation speed detection means for detecting a signal indicating the rotation of the drive source; a work rotation speed detection means for detecting a signal indicating the rotation of the work rotating shaft; and a control for stopping the drive source when a difference in rotation speed occurs between the driven shaft in a rotating state due to power transmission from the drive source and the work rotating shaft based on a comparison of the signals acquired from the drive rotation speed detection means and the work rotation speed detection means, The work rotation speed detection means is A detection target member that rotates together with the work rotating shaft; a sensor mounting member for holding a detection sensor for detecting rotation of the detection target member, the sensor mounting member being connected to a machine frame of the work machine. 、 The detection member is an inner circumferential portion fixed to a step portion formed on a part of an outer circumferential portion of the working rotary shaft; a flat portion extending from the inner circumferential portion in a radial direction of the work rotating shaft; a first inclined portion formed from an end of the flat portion toward the detection sensor; a detection target pulsar portion extending from an end of the first inclined portion in a radial direction of the work rotating shaft, The detection sensor detects a signal generated by the rotation of the detected pulser part. do. Effect of the Invention

[0007] According to the present invention, a work machine can be provided which stops a drive source when a difference in rotation speed occurs between a driven shaft that is rotating due to power transmission from the drive source and a work rotating shaft, based on a comparison of signals obtained from a drive rotation speed detection means and a work rotation speed detection means. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a work machine according to an embodiment of the present invention. [Diagram 2]4A to 4C are diagrams illustrating the structure of a detection member and the structure of a sensor mounting member. [Diagram 3] FIG. 4 is a diagram illustrating the structure of a detection member. [Figure 4] 4A to 4C are diagrams illustrating the structure of a sensor mounting member. [Diagram 5] 4 is a diagram illustrating the positional relationship between a work rotation speed detection unit (detection sensor) attached to a sensor attachment member and a detected member. FIG. [Figure 6] FIG. 2 is a diagram illustrating a control system in the work machine according to the embodiment. [Figure 7] 5A to 5C are diagrams showing examples of detection signals indicating rotation of a drive source and detection signals indicating rotation of a work rotating shaft. [Figure 8] FIG. 4 is a diagram for explaining the flow of processing by a control unit in the work machine according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the multiple features described in the embodiments may be arbitrarily combined. In addition, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0010] The configuration of the working machine according to the embodiment will be described with reference to the drawings. The working machine can be applied to, for example, a walk-behind auger snowplow. The working machine can be applied to various working machines such as lawnmowers and weeding devices, and is not limited to walk-behind auger snowplows. "Front," "rear," "up," "down," "left," and "right" refer to the directions as seen by the operator, with Fr indicating the front side, Rr indicating the rear side, Up indicating the top side, Dn indicating the bottom side, Lt indicating the left side, and Rt indicating the right side.

[0011] Fig. 1 is a side view of a working machine according to an embodiment. As shown in Fig. 1, the working machine 10 is a self-propelled auger snowplow (also called a rotary snowplow) that includes a traveling frame 11 that constitutes the entire body of the working machine 10, left and right traveling devices 12 provided on the traveling frame 11, and a drive source 13 and a working unit 14 that are integrally attached to the traveling frame 11.

[0012] Left and right operating handles 17 extending rearward and upward are integrally attached to the rear of the traveling frame 11. Left and right grips 18 are attached to the tips of the left and right operating handles 17. The worker can operate the work machine 10 using the operating handles 17 while walking alongside the work machine 10.

[0013] The left and right traveling devices 12 are crawler-type traveling devices consisting of left and right electric motors 21, left and right crawler belts 22, left and right drive wheels 23 disposed at the rear, and left and right rolling wheels 24 disposed at the front. The left and right crawler belts 22 can be driven by the driving forces of the left and right electric motors 21 via the left and right drive wheels 23.

[0014] As shown in Fig. 1, the driving source 13 is, for example, an engine. Hereinafter, this driving source 13 will also be referred to as the engine. The driving source 13 drives the working unit 14 via a power transmission mechanism 31, rotates an internal generator of the working machine 10, and supplies power obtained from the internal generator to a battery 33, as well as to the left and right electric motors 21 and other electrical equipment. The left and right electric motors 21 are driven by power generated by the internal generator and power from the battery 33.

[0015] The control system of the work machine 10 is centralized around a control unit 43 provided inside the operation unit 41. The control unit 43 has a built-in memory (storage unit) and controls the work machine by appropriately reading out various information or programs stored in this memory (storage unit).

[0016] The working section 14 comprises an auger housing 51, a blower case 52 integrally provided on the back surface of the auger housing 51, an auger 53 provided within the auger housing 51, a blower 54 provided within the blower case 52, and a chute 55 extending upward from the top of the blower case 52.

[0017] The chute 55 is a so-called snow-throwing section that throws snow raked by the auger 53 to a position away from the work machine 10 using the blower 54. The base end of the chute 55 is rotatably attached to the blower case 52 approximately horizontally so as to adjust the snow-throwing direction, i.e., the orientation of the snow-throwing. Therefore, the chute 55 can rotate approximately parallel to the ground surface Gr on which the traveling device 12 is in contact with the ground. The chute 55 is driven by a chute drive motor.

[0018] A chute guide 57 is provided at the upper end of the chute 55. The chute guide 57 is attached so as to be able to swing up and down relative to the upper end of the chute 55 so as to adjust the snow throwing angle in the vertical direction. The chute guide 57 is driven to swing by a guide drive motor.

[0019] As shown in FIG. 1, the work machine 10 travels forward using the left and right traveling devices 12, while raking up snow with the front auger 53 and blowing the raked snow far away via a chute 55 using a blower 54.

[0020] (Control system of work machine 10) Fig. 2 is a diagram for explaining the structure of the detection target member 81 and the structure of the sensor mounting member 90, and Fig. 6 is a diagram that typically illustrates a control system in the work machine 10. Here, the power transmission mechanism 31 includes a drive pulley 72 connected to the output shaft 13a (drive shaft) of the drive source 13, a driven pulley 74 connected to a driven shaft 75, and a V-belt 73 stretched between the drive pulley 72 and the driven pulley 74, and is configured to be able to change the reduction ratio of the driven pulley 74 relative to the drive pulley 72. The power transmission mechanism 31 transmits the rotation (rotational force) of the drive source 13 to the driven rotating portion (driven shaft 75, driven pulley 74).

[0021] As shown in FIG. 2, the connection part 76 has friction members 76a, 76d connected to the driven shaft 75 and a friction member 76b connected to the work rotation shaft 62. The connection part 76 connects the work rotation shaft 62 connected to the working unit 14 and the driven shaft 75 via the friction members (76a, 76b, 76d), and transmits the rotation of the driven shaft 75 to the work rotation shaft 62. The work rotation shaft 62 connected to the auger 53 and the blower 54 is connected concentrically to the driven shaft 75 via the connection part 76. Note that the friction member 76d is omitted in FIG. 6 to make it easier to understand the positional relationship between the detected member 81 and the work rotation speed detection part 80 (detection sensor).

[0022] The working unit 14 includes an auger 53 that can rotate based on the rotation transmitted by a work rotation shaft 62. The working unit 14 is connected to a driven shaft 75 via the work rotation shaft 62 and a connection part 76 (friction members (76a, 76b, 76d)). The auger 53 is connected to the work rotation shaft 62 via a worm gear type reduction mechanism 64, and the rotation of the driven shaft 75 is transmitted to the auger 53 via the connection part 76, the work rotation shaft 62, and the worm gear type reduction mechanism 64.

[0023] The work rotation speed detection unit 80 (detection sensor) detects the rotation speed, which is the rotation speed of the work rotation shaft 62. The work rotation speed detection unit 80 detects the rotation of a detected member 81 (detected pulser part 83) connected to the friction member 76b, thereby detecting the rotation speed of the work rotation shaft 62 connected to the friction member 76b. Here, the work rotation speed detection unit 80 (detection sensor) has a pulser coil that detects a signal due to the rotation of the detected pulser part 83. The signal indicating the rotation speed of the work rotation shaft 62 can be simply detected by using the pulser coil.

[0024] The work rotation speed detection unit 80 inputs a detection signal (pulse signal) to the control unit 43. The work rotation speed detection unit 80 (detection sensor) is attached to a sensor mounting member 90, as will be described later with reference to FIG. 5, and is attached to the machine frame 500 of the work machine 10 via the sensor mounting member 90. Note that in this embodiment, the configuration for detecting the rotation speed of the work rotation shaft 62 is not limited to the work rotation speed detection unit 80 (detection sensor) and the detected member 81 (detected pulser portion 83), and may be anything that can detect the rotation speed of the work rotation shaft 62.

[0025] The rotating shaft of the drive pulley 72 is connected to an electromagnetic clutch, and when the clutch switch 71 is in the off state, the rotating shaft of the drive pulley 72 is released from the output shaft 13a of the drive source 13. When the clutch switch 71 is in the on state, the rotating shaft of the drive pulley 72 is connected to the output shaft 13a of the drive source 13, and the rotation of the drive source 13 can be transmitted. A status signal indicating the state (off state, on state) of the clutch switch 71 is input to the control unit 43. Based on the status signal from the clutch switch 71, the control unit 43 can determine whether the rotating shaft of the drive pulley 72 and the output shaft 13a of the drive source 13 are connected or released.

[0026] The ignition processing device 13b (D-CDI) of the driving source 13 functions as a driving rotation speed detection unit that detects a signal indicating the rotation of the driving source 13. The ignition processing device 13b (D-CDI) detects a signal indicating the rotation speed of the driving source 13 (engine) and inputs the detection signal to the control unit 43.

[0027] The control unit 43 compares the detection signal detected by the work rotation speed detection unit 80 with the detection signal detected by the ignition treatment device 13b (D-CDI) to determine whether or not the auger 53 is in a locked state.

[0028] FIG. 7 is a diagram showing an example of detection of a detection signal 701 indicating the rotation of the driving source 13 and a detection signal 702 indicating the rotation of the work rotating shaft 62. In FIG.

[0029] When no overload is acting on the auger 53 (when the work machine 10 is in normal operation), the driven shaft 75 connected to the driven pulley 74 and the work rotation shaft 62 rotate at the same rotation speed, and no relative difference in rotation speed (differential rotation) occurs between the driven pulley 74 (driven shaft 75) and the work rotation shaft 62. The detection signal 701 indicating the rotation of the drive source 13 and the detection signal 702 indicating the rotation of the work rotation shaft 62 are detected as synchronized signals.

[0030] On the other hand, if the auger 53 is locked while the work machine 10 is working, the work rotating shaft 62 stops rotating even though the drive source 13 is generating rotation. That is, the detection signal 703 that should be detected during normal work is not detected. The driven shaft 75 connected to the driven pulley 74 rotates due to the power transmission from the drive source 13, and a relative rotation speed difference (differential rotation) occurs between the rotating driven pulley 74 (driven shaft 75) and the stopped work rotating shaft 62. If the work rotation speed detection unit 80 does not detect the detection signal 703 indicating the rotation of the work rotating shaft 62 even though the ignition device 13b (D-CDI) detects the detection signal 701 indicating the rotation of the drive source 13, the control unit 43 determines that the auger 53 is in a locked state.

[0031] When the control unit 43 determines that the auger 53 is in a locked state, it generates a control signal to stop the driving source 13 and transmits it to the ignition processing device 13b (D-CDI), and the ignition processing device 13b (D-CDI) performs engine misfire processing to stop the driving source 13 based on the control signal received from the control unit 43. Note that, although an example of a configuration for detecting the rotation of the driving source 13 has been described in Fig. 6, the rotation of the driven pulley 74 or the driven shaft 75 may also be detected.

[0032] FIG. 8 is a diagram illustrating the flow of processing by the control unit 43 in the work machine 10.

[0033] In S801, the control unit 43 determines whether the rotating shaft of the drive pulley 72 and the output shaft 13a of the drive source 13 are connected or released based on the status signal from the clutch switch 71. When the clutch switch 71 is turned on, the rotating shaft of the drive pulley 72 is connected to the output shaft 13a of the drive source 13, and power transmission is started, making it possible to transmit the rotation of the drive source 13.

[0034] In step S802, the control unit 43 determines whether a specified time has elapsed since the clutch switch 71 was turned on. If the specified time has not elapsed (S802-No), the control unit 43 waits until the specified time has elapsed. On the other hand, if the specified time has elapsed (S802-Yes), the control unit 43 advances the process to S803.

[0035] In S803, the control unit 43 acquires signals from the ignition processing device 13b (D-CDI) and the work rotation speed detection unit 80. Then, the control unit 43 determines whether or not a rotation speed difference (differential rotation) occurs between the driven pulley 74 (driven shaft 75) in a rotating state due to power transmission from the drive source 13 and the work rotation shaft 62 based on a comparison of the acquired signals. If no rotation speed difference occurs (S804-No), the process returns to S803 and the signal acquisition process continues. On the other hand, if a rotation speed difference occurs (S804-Yes), the control unit 43 advances the process to S805.

[0036] In S805, the control unit 43 performs stop control. That is, the control unit 43 determines that the auger 53 is in a locked state, generates a control signal to stop the driving source 13, and transmits it to the ignition processing device 13b (D-CDI). The ignition processing device 13b (D-CDI) performs engine extinguishing processing to stop the driving source 13 based on the control signal received from the control unit 43. When the control unit 43 determines that the auger 53 is in a locked state, the control unit 43 controls the display of the display unit 44 to notify the operator that the auger 53 is in a locked state (a state in which a difference in rotation has occurred between the rotation speed of the driven shaft 75 and the rotation speed of the work rotating shaft 62). As the display control of the display unit 44, the control unit 43 can blink an LED display, change the display color, or display notification information on the display of the display unit 44.

[0037] In S806, the control unit 43 stores lock occurrence information indicating the occurrence of a locked state in a memory (storage unit). At this time, the control unit 43 refers to information of the internal clock, and stores the information in combination with date and time when the locked state occurred.

[0038] In S807, the control unit 43 determines whether the frequency of occurrence of the locked state exceeds a specified frequency based on the lock occurrence information and date and time information stored in the memory (storage unit). If the frequency of occurrence of the locked state does not exceed the specified frequency (S807-No), the process ends. On the other hand, if the frequency of occurrence of the locked state exceeds the specified frequency (S807-Yes), the control unit 43 advances the process to S808.

[0039] In S808, the control unit acquires a detection signal 701 indicating the rotation of the driving source 13 and a detection signal 702 indicating the rotation of the work rotation shaft 62, and notifies the worker (user) of maintenance information. For example, the control unit 43 can also notify the worker of information requesting replacement of a consumable part.

[0040] (Structure of the detected member 81) Fig. 2 is a diagram for explaining the structure of the detected member 81 and the structure of the sensor mounting member 90, and Fig. 3 is a diagram for explaining the structure of the detected member 81. ST32 in Fig. 3 is a front view of the detected member 81 as viewed from the working unit 14 side, and ST31 in Fig. 3 is a side view of the detected member 81 in the AA cross section of ST32. ST33 in Fig. 3 is a front view of the friction member 76b as viewed from the working unit 14 side, and a groove 76c is formed in the hollow inner peripheral part of the friction member 76b. The groove 76 engages with a spline formed on the outer peripheral surface of the work rotating shaft 62, whereby the friction member 76b is connected to the work rotating shaft 62.

[0041] The detected member 81 has an inner peripheral portion 85a, a flat portion 85, a first inclined portion 84a, a second inclined portion 84b, an engagement portion 82, and a detected pulser portion 83. The inner peripheral portion 85a of the detected member 81 is fixed to a step portion 62a formed on a part of the outer peripheral portion of the work rotating shaft 62 by welding. Note that the fixing (integration) is not limited to by welding, and for example, the inner peripheral portion 85a of the detected member 81 can be configured to be fitted into and integrated with the step portion 62a formed on a part of the outer peripheral portion of the work rotating shaft 62. The flat portion 85 of the detected member 81 extends from the inner peripheral portion 85a in the radial direction of the work rotating shaft 62. The first inclined portion 84a is formed inclined from the end of the flat portion 85 toward the work RPM detection portion 80 (detection sensor side) (front side of the work machine 10), and the detected pulser portion 83 extends from the end of the first inclined portion 84a in the radial direction of the work rotation shaft 62. The detected pulser portion 83 is formed approximately parallel to the flat portion 85. The work RPM detection portion 80 (detection sensor) detects a signal generated by the rotation of the detected pulser portion 83.

[0042] The second inclined portion 84b is formed inclined from the end of the flat portion 85 toward the friction member side (the friction member 76b side, the rear side of the work machine 10), and the engagement portion 82 extends from the end of the second inclined portion 84b in the radial direction of the work rotation shaft 62. The engagement portion 82 is formed approximately parallel to the flat portion 85. The engagement portion 82 is coupled to the friction member 76b by engaging with a groove portion 76c (a part of the groove portion 76c) formed on the inner periphery of the friction member 76b.

[0043] By configuring the detectable member 81 in this manner, the detectable pulser portion 83 can be brought close to the work rotation speed detection portion 80 (detection sensor) side, while the engagement portion 82 can be brought close to the friction member 76b and connected to the friction member 76b, thereby making it possible to provide a compact device configuration for the work machine 10.

[0044] (Structure of sensor mounting member 90) Next, the structure of the sensor mounting member 90 will be described. Fig. 4 is a diagram illustrating the structure of the sensor mounting member 90. ST41 in Fig. 4 is a front view of the sensor mounting member 90 as viewed from the working unit 14 side, and ST42 in Fig. 4 is a view of the sensor mounting member 90 of ST41 as viewed from below. In the sensor mounting member 90, a bearing holding portion 92, a sensor holding portion 94, and a frame connecting portion 96 are formed in a single member.

[0045] The bearing holder 92 holds a bearing that rotatably supports the work rotation shaft 62. The sensor holder 94 has an opening 94a formed in a single member and a flange 94b formed by bending a part of the single member, and a screw hole 94c for engaging with a fastening member 520 such as a bolt is formed in the flange 94b. The work rotation speed detection unit 80 (detection sensor) is provided with a sensor flange 80b (FIG. 5) at a position opposite to the flange 94b. A through hole is formed in the sensor flange 80b in accordance with the position of the screw hole 94c of the flange 94b. The fastening member 520 engages with the screw hole 94c of the flange 94b through the through hole of the sensor flange 80b, so that the work rotation speed detection unit 80 (detection sensor) is held by the sensor holder 94. The sensor holder 94 holds the work rotation speed detection unit 80 (detection sensor) arranged in the opening 94a to the flange 94b by the fastening member. The frame connection portion 96 is an opening for connecting the sensor mounting member 90 to a machine frame 500 (FIG. 5) of the work machine 10 via a fastening member 510 (FIG. 5).

[0046] Fig. 5 is a diagram for explaining the positional relationship between the work rotation speed detection unit 80 (detection sensor) attached to the sensor attachment member 90 and the detected member 81. ST52 in Fig. 5 is a front view showing the positional relationship as seen from the working unit 14 side, and ST51 in Fig. 5 is a side view of the positional relationship.

[0047] The bearing holding portion 92 holds a bearing 530 that rotatably supports the work rotation shaft 62. The work rotation speed detection portion 80 (detection sensor) is disposed in an opening 94a of the sensor holding portion 94. The frame connecting portion 96 is an opening for connecting the sensor mounting member 90 to the machine frame 500 of the work machine 10 via a fastening member 510. The fastening member 510 connected to the machine frame 500 of the work machine 10 is inserted into the frame connecting portion 96 (opening), and the left and right sides of the sensor mounting member 90 are fastened (connected) to the fastening member 510 with members such as screws or retaining rings, thereby fastening (connecting) the sensor mounting member 90 to the machine frame 500 of the work machine 10 via the fastening member 510.

[0048] As shown in ST51 of Fig. 5, the detected pulser portion 83 of the detected member 81 is disposed in a state close to the pulser detection portion 80a of the work rotation speed detection portion 80 (detection sensor) held by the sensor mounting member 90 while avoiding interference with the bearing holding portion 92. According to the configuration of the detected member 81 and the sensor mounting member 90 of this embodiment, it is possible to make the work machine 10 have a compact device configuration while avoiding interference with the detected member 81 that rotates together with the rotation of the work rotation shaft 62. Furthermore, according to the configuration of the sensor mounting member 90, it is possible to realize three functions, namely, holding the bearing 530, holding the work rotation speed detection portion 80, and connecting the sensor mounting member 90 to the machine frame 500, with a single part (member), and it is possible to suppress the manufacturing cost of the work machine 10 by reducing the number of parts.

[0049] (Summary of the embodiment) The above embodiment discloses at least the following working machine.

[0050] Configuration 1. The working machine of the above embodiment includes a drive source (13), A transmission means (31) for transmitting the rotation of the drive source; a driven rotation means (74) that rotates a driven shaft (75) in response to the rotation transmitted by the transmission means; a connecting means (76) that connects a work rotating shaft (62) connected to a working unit (14) and the driven shaft (75) via a friction member and transmits rotation of the driven shaft (75) to the work rotating shaft (62); A working machine having: a drive rotation speed detection means for detecting a signal indicating the rotation of the drive source; A work rotation speed detection means (80, 81, 90) for detecting a signal indicating the rotation of the work rotating shaft; and a control means (43) for stopping the drive source when a difference in rotation speed occurs between the driven shaft in a rotating state due to power transmission from the drive source and the work rotating shaft based on a comparison of signals acquired from the drive rotation speed detection means and the work rotation speed detection means, The operation rotation speed detection means (80, 81, 90) A detection member (81) that rotates together with the work rotating shaft; and a sensor mounting member (90) that holds a detection sensor (80) that detects rotation of the detection target member, and the sensor mounting member (90) is connected to a machine frame (500) of the work machine.

[0051] According to the work machine of configuration 1, when a difference in rotation speed occurs between the driven shaft rotating due to power transmission from the drive source and the work rotating shaft based on a comparison of the signals obtained from the drive rotation speed detection means and the work rotation speed detection means, the drive source can be stopped, thereby preventing wear of the friction members.

[0052] Configuration 2: In the working machine of the above embodiment, the detection member (81) is an inner peripheral portion (85a) fixed to a step portion (62a) formed on a part of the outer peripheral portion of the working rotating shaft (62); a flat portion (85) extending from the inner peripheral portion (85a) in a radial direction of the work rotating shaft (62); a first inclined portion (84a) formed from an end of the flat portion (85) toward the detection sensor (80); a detected pulsar portion (83) extending from an end of the first inclined portion (84a) in a radial direction of the work rotating shaft (62), The detection sensor (80) detects a signal generated by the rotation of the detected pulser portion (83).

[0053] Configuration 3: In the working machine of the above embodiment, the detection member (81) is a second inclined portion (84b) formed from an end of the flat portion (85) toward a friction member (76b) connected to the work rotating shaft (62); an engaging portion (82) extending from an end of the second inclined portion (84b) in a radial direction of the work rotating shaft (62), The engaging portion (82) engages with a groove (76c) formed on the inner periphery of a friction member (76b) connected to the work rotating shaft (62), and is thereby connected to the friction member (76b).

[0054] According to the work machines of configurations 2 and 3, the detectable pulser part can be brought close to the work rotation speed detection part (detection sensor) side, and the engagement part can be brought close to the friction member connected to the work rotation shaft and connected to the friction member, thereby making it possible to make the work machine have a compact device configuration.

[0055] In the working machine of the above embodiment, the sensor mounting member (90) is a bearing holder (92) for holding a bearing (530) that rotatably supports the work rotating shaft (62); a sensor holder (94) for holding the detection sensor (80); A frame connecting portion (96) is formed to connect the sensor mounting member (90) to a machine body frame (500) of the working machine (10).

[0056] Configuration 5: In the working machine of the above embodiment, the sensor mounting member is configured as a single member, The sensor holding portion (94) has an opening (94a) formed in the member and a flange portion (94b) formed by bending a part of the member, The sensor holder (94) holds the detection sensor (80) disposed in the opening (94a) on the flange portion (94b) with a fastening member.

[0057] According to the work machines of configurations 4 and 5, the three functions of holding the bearings, holding the work RPM detection unit (detection sensor), and connecting the sensor mounting member to the machine frame can be achieved with a single part (member), and the manufacturing costs of the work machine can be reduced by reducing the number of parts.

[0058] Configuration 6: In the working machine of the above embodiment, the detection sensor (80) has a pulser coil for detecting a signal generated by rotation of the detected pulser part (83).

[0059] According to the work machine of configuration 6, the signal indicating the rotation speed of the work rotating shaft can be simply detected by using a pulsar coil.

[0060] Configuration 7. In the working machine of the above embodiment, the working unit (14) includes the auger (53) which is rotatable based on the rotation transmitted by the work rotating shaft (62).

[0061] According to the working machine of configuration 7, the overload acting on the auger in the working section can be reduced, and the auger can be protected. This makes it possible to prevent wear on the parts that transmit power to the auger.

[0062] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention. [Explanation of symbols]

[0063] 10: Work machine (snowplow), 13: Drive source (engine) 14: working unit, 31: power transmission mechanism, 43: control unit, 53: auger 80: work rotation speed detection unit (detection sensor), 81: detection target member, 90: Sensor mounting material

Claims

1. A driving source; A transmission means for transmitting the rotation of the driving source; a driven rotation means for rotating a driven shaft in response to the rotation transmitted by the transmission means; a connecting means for connecting a work rotating shaft connected to a working unit and the driven shaft via a friction member and transmitting rotation of the driven shaft to the work rotating shaft; A working machine having: a drive rotation speed detection means for detecting a signal indicating the rotation of the drive source; a work rotation speed detection means for detecting a signal indicating the rotation of the work rotating shaft; and a control for stopping the drive source when a difference in rotation speed occurs between the driven shaft in a rotating state due to power transmission from the drive source and the work rotating shaft based on a comparison of the signals acquired from the drive rotation speed detection means and the work rotation speed detection means, The work rotation speed detection means is A detection target member that rotates together with the work rotating shaft; a sensor mounting member for holding a detection sensor that detects rotation of the detection target member, the sensor mounting member being connected to a machine frame of the work machine; The detection member is an inner circumferential portion fixed to a step portion formed on a part of an outer circumferential portion of the working rotary shaft; a flat portion extending from the inner circumferential portion in a radial direction of the work rotating shaft; a first inclined portion formed from an end of the flat portion toward the detection sensor; a detected pulsar portion extending from an end of the first inclined portion in a radial direction of the work rotating shaft, The detection sensor detects a signal generated by the rotation of the detected pulser portion. A work machine characterized by:

2. The detection member is a second inclined portion formed from an end of the flat portion toward a friction member connected to the work rotating shaft; an engagement portion extending from an end of the second inclined portion in a radial direction of the work rotating shaft, 2. The work machine according to claim 1, wherein the engaging portion is connected to the friction member by engaging with a groove formed on an inner periphery of the friction member connected to the work rotating shaft.

3. The sensor mounting member includes: a bearing holder for holding a bearing that rotatably supports the work rotating shaft; a sensor holder for holding the detection sensor; a frame connecting portion that connects the sensor mounting member to a machine body frame of the work machine is formed.

3. The working machine according to claim 1 or 2.

4. the sensor mounting member is formed of a single member, the sensor holding portion has an opening formed in the member and a flange portion formed by bending a part of the member, The sensor holder holds the detection sensor disposed in the opening to the flange portion by a fastening member.

4. The work machine according to claim 3.

5. 2. The work machine according to claim 1, wherein the detection sensor has a pulser coil that detects a signal generated by rotation of the detected pulser portion.

6. 6. The work machine according to claim 1, wherein the working unit includes an auger that is rotatable based on the rotation transmitted by the work rotating shaft.

Images