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JP-7854886-B2 - Work equipment

JP7854886B2JP 7854886 B2JP7854886 B2JP 7854886B2JP-7854886-B2

Inventors

  • 松本 拓也
  • 太田 能司
  • 諸井 篤

Assignees

  • 本田技研工業株式会社

Dates

Publication Date
20260507
Application Date
20220718

Claims (7)

  1. A work machine comprising a travel frame having a travel section, and a main frame having a work section that is rotatably attached to the travel frame around a pivot extending laterally and tilts forward and backward relative to the travel frame by rotation around the pivot, wherein a breather device for a gear case is provided on the main frame, The breather device is, The gear case comprises a gear chamber and a breather chamber, The upper part of the breather chamber has a breathing hole that communicates with the outside, A communication hole connecting the lower part of the breather chamber and the gear chamber, It has a partition wall that extends in a direction transverse between the breathing hole and the communication hole, The breather chamber extends in the front-to-back direction. The partition wall includes a first portion extending vertically at a position behind the breathing hole and a second portion extending forward from the lower end of the first portion, and the working machine has a gap between the front end of the second portion and the front wall of the breather chamber that connects the breathing hole and the communication hole.
  2. The work machine according to claim 1, wherein the breathing hole is located above the oil level in the gear chamber when the work section is at its maximum forward tilt.
  3. The working machine according to claim 1 or 2, wherein the front end of the second portion is formed to be positioned above the oil level in the gear chamber when the working section is tilted to its maximum rearward position.
  4. The work machine according to claim 1 or 2, wherein the communication hole is provided in the front part of the breather chamber.
  5. The work machine according to claim 1 or 2, wherein the communication holes are provided in the front and rear portions of the breather chamber.
  6. The work machine according to claim 5, wherein the rear communication hole has a larger opening area than the front communication hole.
  7. The breather chamber is defined in the upper part of the gear case. The work machine according to claim 1 or 2, wherein the breathing holes are formed near the upper wall defining the breather chamber.

Description

This invention relates to a breather device for a gear case and a work machine. In recent years, efforts to provide access to sustainable transportation systems that take into account vulnerable groups among transportation participants have become increasingly active. To achieve this, we are focusing on research and development related to snow removal equipment to further improve transportation safety and the convenience of movement and daily life. As for snow removal machines, those that allow for electric adjustment of the ground height of the snow removal tool (auger) are known (for example, Patent Document 1). The gear case connected to the electric motor provided in the ground height adjustment device of the snow removal tool preferably has a breather device, such as the one shown in Patent Document 2, which includes air breathing holes formed in the gear case, in order to avoid changes in internal pressure of the gear case due to temperature changes. Japanese Patent Publication No. 2017-115305Patent No. 3697597 Side view of a snowblower to which the gear case breather device according to the present invention is applied.Perspective view showing the travel and rotation mechanisms of a snowblower.Cross-sectional view showing the main part of the motor case breather device according to this embodiment.Partial cross-sectional perspective view of the connection between the motor case and the gear case according to this embodiment.Perspective view of the gear case according to this embodimentEnlarged perspective view showing the breather device of the gear case according to this embodiment.An explanatory diagram showing the inclination of the gear case and the oil level in the snowblower according to this embodiment. The embodiments of the present invention will be described in detail below with reference to the drawings. In the following embodiments, the present invention is applied to a snowblower 10. Hereafter, terms indicating directions such as front/back, left/right, up/down will be used based on the direction as seen from the perspective of the operator operating the snowblower 10. First, the overall configuration of the snowblower 10 will be explained with reference to Figures 1 and 2. The snowblower 10 is a walk-behind type snowblower in which an operator walks behind it while performing snow removal work. The snowblower 10 has a lower body 12 and an upper body 14 that is rotatably attached to a front shaft 24 (described later) provided on the lower body 12. A traveling device 16 and a steering device 18 are attached to the lower body 12. A snow removal auger device 20 and a blower device 22 are attached to the upper body 14. The running gear 16 comprises a front axle 24 and a rear axle 26 rotatably mounted on the lower body 12 so as to extend horizontally in the left-right direction, drive wheels 28 attached to both the left and right ends of the front axle 24, driven wheels 30 attached to both the left and right ends of the rear axle 26, left and right crawlers (endless running belts) 32 stretched between the left and right drive wheels 28 and driven wheels 30, and a running drive unit 34 attached to the lower body 12, including an electric motor that rotates the drive wheels 28 via the front axle 24. Note that Figure 2 shows the left crawler 32 detached from the drive wheel 28 and driven wheel 30. The handle device 18 has left and right arms 36 extending upward and rearward from the rear of the lower body 12, and left and right grips 38 and an input device 40 attached to the upper ends of the arms 36. The grips 38 are held by the operator. The input device 40 is a device that receives input operations from the operator. For example, it includes a travel lever 42 for receiving travel operations of the snowblower 10, a snow removal switch 44 for receiving operations for snow removal work using the auger device 20 and blower device 22, a height adjustment switch 46 for receiving rotation operations (height adjustment operations) of the upper body 14 (described later), and a clutch lever 48 for receiving operations of the deadman clutch 72 (described later). The auger device 20 includes an auger housing 50 attached to the upper body 14 via a blower housing 58 (described later), a screw gear case 52 attached to the auger housing 50, an auger rotation shaft 54 extending horizontally from the screw gear case 52 within the auger housing 50 in the left-right direction, and auger claws 56 attached to the auger rotation shaft 54. The blower device 22 includes a blower housing 58 attached to the upper body 14, a blower 60 rotatably mounted within the blower housing 58, and a chute 62 attached to the upper part of the blower housing 58. Snow removal is performed by the rotation of the auger claws 56 as the snowblower 10 moves, crushing the snow in front of the snowblower 10, and collecting it in the auger housing 50. The snow collected in the auger housing 50 is then guided into the blower housing 58 by the